forked from Minki/linux
Merge branch 'core-futexes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'core-futexes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: arm: Remove bogus comment in futex_atomic_cmpxchg_inatomic() futex: Deobfuscate handle_futex_death() plist: Add priority list test plist: Shrink struct plist_head futex,plist: Remove debug lock assignment from plist_node futex,plist: Pass the real head of the priority list to plist_del() futex: Sanitize futex ops argument types futex: Sanitize cmpxchg_futex_value_locked API futex: Remove redundant pagefault_disable in futex_atomic_cmpxchg_inatomic() futex: Avoid redudant evaluation of task_pid_vnr() futex: Update futex_wait_setup comments about locking
This commit is contained in:
Linus Torvalds
commit
b80cd62b7d
@ -29,7 +29,7 @@
|
||||
: "r" (uaddr), "r"(oparg) \
|
||||
: "memory")
|
||||
|
||||
static inline int futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
|
||||
static inline int futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr)
|
||||
{
|
||||
int op = (encoded_op >> 28) & 7;
|
||||
int cmp = (encoded_op >> 24) & 15;
|
||||
@ -39,7 +39,7 @@ static inline int futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
|
||||
if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
|
||||
oparg = 1 << oparg;
|
||||
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
pagefault_disable();
|
||||
@ -81,21 +81,23 @@ static inline int futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
|
||||
}
|
||||
|
||||
static inline int
|
||||
futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
|
||||
futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
|
||||
u32 oldval, u32 newval)
|
||||
{
|
||||
int prev, cmp;
|
||||
int ret = 0, cmp;
|
||||
u32 prev;
|
||||
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
__asm__ __volatile__ (
|
||||
__ASM_SMP_MB
|
||||
"1: ldl_l %0,0(%2)\n"
|
||||
" cmpeq %0,%3,%1\n"
|
||||
" beq %1,3f\n"
|
||||
" mov %4,%1\n"
|
||||
"2: stl_c %1,0(%2)\n"
|
||||
" beq %1,4f\n"
|
||||
"1: ldl_l %1,0(%3)\n"
|
||||
" cmpeq %1,%4,%2\n"
|
||||
" beq %2,3f\n"
|
||||
" mov %5,%2\n"
|
||||
"2: stl_c %2,0(%3)\n"
|
||||
" beq %2,4f\n"
|
||||
"3: .subsection 2\n"
|
||||
"4: br 1b\n"
|
||||
" .previous\n"
|
||||
@ -105,11 +107,12 @@ futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
|
||||
" .long 2b-.\n"
|
||||
" lda $31,3b-2b(%0)\n"
|
||||
" .previous\n"
|
||||
: "=&r"(prev), "=&r"(cmp)
|
||||
: "+r"(ret), "=&r"(prev), "=&r"(cmp)
|
||||
: "r"(uaddr), "r"((long)oldval), "r"(newval)
|
||||
: "memory");
|
||||
|
||||
return prev;
|
||||
*uval = prev;
|
||||
return ret;
|
||||
}
|
||||
|
||||
#endif /* __KERNEL__ */
|
||||
|
||||
@ -35,7 +35,7 @@
|
||||
: "cc", "memory")
|
||||
|
||||
static inline int
|
||||
futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
|
||||
futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr)
|
||||
{
|
||||
int op = (encoded_op >> 28) & 7;
|
||||
int cmp = (encoded_op >> 24) & 15;
|
||||
@ -46,7 +46,7 @@ futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
|
||||
if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
|
||||
oparg = 1 << oparg;
|
||||
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
pagefault_disable(); /* implies preempt_disable() */
|
||||
@ -88,36 +88,35 @@ futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
|
||||
}
|
||||
|
||||
static inline int
|
||||
futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
|
||||
futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
|
||||
u32 oldval, u32 newval)
|
||||
{
|
||||
int val;
|
||||
int ret = 0;
|
||||
u32 val;
|
||||
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
pagefault_disable(); /* implies preempt_disable() */
|
||||
|
||||
__asm__ __volatile__("@futex_atomic_cmpxchg_inatomic\n"
|
||||
"1: " T(ldr) " %0, [%3]\n"
|
||||
" teq %0, %1\n"
|
||||
"1: " T(ldr) " %1, [%4]\n"
|
||||
" teq %1, %2\n"
|
||||
" it eq @ explicit IT needed for the 2b label\n"
|
||||
"2: " T(streq) " %2, [%3]\n"
|
||||
"2: " T(streq) " %3, [%4]\n"
|
||||
"3:\n"
|
||||
" .pushsection __ex_table,\"a\"\n"
|
||||
" .align 3\n"
|
||||
" .long 1b, 4f, 2b, 4f\n"
|
||||
" .popsection\n"
|
||||
" .pushsection .fixup,\"ax\"\n"
|
||||
"4: mov %0, %4\n"
|
||||
"4: mov %0, %5\n"
|
||||
" b 3b\n"
|
||||
" .popsection"
|
||||
: "=&r" (val)
|
||||
: "+r" (ret), "=&r" (val)
|
||||
: "r" (oldval), "r" (newval), "r" (uaddr), "Ir" (-EFAULT)
|
||||
: "cc", "memory");
|
||||
|
||||
pagefault_enable(); /* subsumes preempt_enable() */
|
||||
|
||||
return val;
|
||||
*uval = val;
|
||||
return ret;
|
||||
}
|
||||
|
||||
#endif /* !SMP */
|
||||
|
||||
@ -7,10 +7,11 @@
|
||||
#include <asm/errno.h>
|
||||
#include <asm/uaccess.h>
|
||||
|
||||
extern int futex_atomic_op_inuser(int encoded_op, int __user *uaddr);
|
||||
extern int futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr);
|
||||
|
||||
static inline int
|
||||
futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
|
||||
futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
|
||||
u32 oldval, u32 newval)
|
||||
{
|
||||
return -ENOSYS;
|
||||
}
|
||||
|
||||
@ -18,7 +18,7 @@
|
||||
* the various futex operations; MMU fault checking is ignored under no-MMU
|
||||
* conditions
|
||||
*/
|
||||
static inline int atomic_futex_op_xchg_set(int oparg, int __user *uaddr, int *_oldval)
|
||||
static inline int atomic_futex_op_xchg_set(int oparg, u32 __user *uaddr, int *_oldval)
|
||||
{
|
||||
int oldval, ret;
|
||||
|
||||
@ -50,7 +50,7 @@ static inline int atomic_futex_op_xchg_set(int oparg, int __user *uaddr, int *_o
|
||||
return ret;
|
||||
}
|
||||
|
||||
static inline int atomic_futex_op_xchg_add(int oparg, int __user *uaddr, int *_oldval)
|
||||
static inline int atomic_futex_op_xchg_add(int oparg, u32 __user *uaddr, int *_oldval)
|
||||
{
|
||||
int oldval, ret;
|
||||
|
||||
@ -83,7 +83,7 @@ static inline int atomic_futex_op_xchg_add(int oparg, int __user *uaddr, int *_o
|
||||
return ret;
|
||||
}
|
||||
|
||||
static inline int atomic_futex_op_xchg_or(int oparg, int __user *uaddr, int *_oldval)
|
||||
static inline int atomic_futex_op_xchg_or(int oparg, u32 __user *uaddr, int *_oldval)
|
||||
{
|
||||
int oldval, ret;
|
||||
|
||||
@ -116,7 +116,7 @@ static inline int atomic_futex_op_xchg_or(int oparg, int __user *uaddr, int *_ol
|
||||
return ret;
|
||||
}
|
||||
|
||||
static inline int atomic_futex_op_xchg_and(int oparg, int __user *uaddr, int *_oldval)
|
||||
static inline int atomic_futex_op_xchg_and(int oparg, u32 __user *uaddr, int *_oldval)
|
||||
{
|
||||
int oldval, ret;
|
||||
|
||||
@ -149,7 +149,7 @@ static inline int atomic_futex_op_xchg_and(int oparg, int __user *uaddr, int *_o
|
||||
return ret;
|
||||
}
|
||||
|
||||
static inline int atomic_futex_op_xchg_xor(int oparg, int __user *uaddr, int *_oldval)
|
||||
static inline int atomic_futex_op_xchg_xor(int oparg, u32 __user *uaddr, int *_oldval)
|
||||
{
|
||||
int oldval, ret;
|
||||
|
||||
@ -186,7 +186,7 @@ static inline int atomic_futex_op_xchg_xor(int oparg, int __user *uaddr, int *_o
|
||||
/*
|
||||
* do the futex operations
|
||||
*/
|
||||
int futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
|
||||
int futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr)
|
||||
{
|
||||
int op = (encoded_op >> 28) & 7;
|
||||
int cmp = (encoded_op >> 24) & 15;
|
||||
@ -197,7 +197,7 @@ int futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
|
||||
if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
|
||||
oparg = 1 << oparg;
|
||||
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
pagefault_disable();
|
||||
|
||||
@ -46,7 +46,7 @@ do { \
|
||||
} while (0)
|
||||
|
||||
static inline int
|
||||
futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
|
||||
futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr)
|
||||
{
|
||||
int op = (encoded_op >> 28) & 7;
|
||||
int cmp = (encoded_op >> 24) & 15;
|
||||
@ -56,7 +56,7 @@ futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
|
||||
if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
|
||||
oparg = 1 << oparg;
|
||||
|
||||
if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
|
||||
if (! access_ok (VERIFY_WRITE, uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
pagefault_disable();
|
||||
@ -100,23 +100,26 @@ futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
|
||||
}
|
||||
|
||||
static inline int
|
||||
futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
|
||||
futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
|
||||
u32 oldval, u32 newval)
|
||||
{
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
{
|
||||
register unsigned long r8 __asm ("r8");
|
||||
register unsigned long r8 __asm ("r8") = 0;
|
||||
unsigned long prev;
|
||||
__asm__ __volatile__(
|
||||
" mf;; \n"
|
||||
" mov ar.ccv=%3;; \n"
|
||||
"[1:] cmpxchg4.acq %0=[%1],%2,ar.ccv \n"
|
||||
" .xdata4 \"__ex_table\", 1b-., 2f-. \n"
|
||||
"[2:]"
|
||||
: "=r" (r8)
|
||||
: "=r" (prev)
|
||||
: "r" (uaddr), "r" (newval),
|
||||
"rO" ((long) (unsigned) oldval)
|
||||
: "memory");
|
||||
*uval = prev;
|
||||
return r8;
|
||||
}
|
||||
}
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
})
|
||||
|
||||
static inline int
|
||||
futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
|
||||
futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr)
|
||||
{
|
||||
int op = (encoded_op >> 28) & 7;
|
||||
int cmp = (encoded_op >> 24) & 15;
|
||||
@ -39,7 +39,7 @@ futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
|
||||
if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
|
||||
oparg = 1 << oparg;
|
||||
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
pagefault_disable();
|
||||
@ -94,31 +94,34 @@ futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
|
||||
}
|
||||
|
||||
static inline int
|
||||
futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
|
||||
futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
|
||||
u32 oldval, u32 newval)
|
||||
{
|
||||
int prev, cmp;
|
||||
int ret = 0, cmp;
|
||||
u32 prev;
|
||||
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
__asm__ __volatile__ ("1: lwx %0, %2, r0; \
|
||||
cmp %1, %0, %3; \
|
||||
beqi %1, 3f; \
|
||||
2: swx %4, %2, r0; \
|
||||
addic %1, r0, 0; \
|
||||
bnei %1, 1b; \
|
||||
__asm__ __volatile__ ("1: lwx %1, %3, r0; \
|
||||
cmp %2, %1, %4; \
|
||||
beqi %2, 3f; \
|
||||
2: swx %5, %3, r0; \
|
||||
addic %2, r0, 0; \
|
||||
bnei %2, 1b; \
|
||||
3: \
|
||||
.section .fixup,\"ax\"; \
|
||||
4: brid 3b; \
|
||||
addik %0, r0, %5; \
|
||||
addik %0, r0, %6; \
|
||||
.previous; \
|
||||
.section __ex_table,\"a\"; \
|
||||
.word 1b,4b,2b,4b; \
|
||||
.previous;" \
|
||||
: "=&r" (prev), "=&r"(cmp) \
|
||||
: "+r" (ret), "=&r" (prev), "=&r"(cmp) \
|
||||
: "r" (uaddr), "r" (oldval), "r" (newval), "i" (-EFAULT));
|
||||
|
||||
return prev;
|
||||
*uval = prev;
|
||||
return ret;
|
||||
}
|
||||
|
||||
#endif /* __KERNEL__ */
|
||||
|
||||
@ -75,7 +75,7 @@
|
||||
}
|
||||
|
||||
static inline int
|
||||
futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
|
||||
futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr)
|
||||
{
|
||||
int op = (encoded_op >> 28) & 7;
|
||||
int cmp = (encoded_op >> 24) & 15;
|
||||
@ -85,7 +85,7 @@ futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
|
||||
if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
|
||||
oparg = 1 << oparg;
|
||||
|
||||
if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
|
||||
if (! access_ok (VERIFY_WRITE, uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
pagefault_disable();
|
||||
@ -132,11 +132,13 @@ futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
|
||||
}
|
||||
|
||||
static inline int
|
||||
futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
|
||||
futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
|
||||
u32 oldval, u32 newval)
|
||||
{
|
||||
int retval;
|
||||
int ret = 0;
|
||||
u32 val;
|
||||
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
if (cpu_has_llsc && R10000_LLSC_WAR) {
|
||||
@ -145,25 +147,25 @@ futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
|
||||
" .set push \n"
|
||||
" .set noat \n"
|
||||
" .set mips3 \n"
|
||||
"1: ll %0, %2 \n"
|
||||
" bne %0, %z3, 3f \n"
|
||||
"1: ll %1, %3 \n"
|
||||
" bne %1, %z4, 3f \n"
|
||||
" .set mips0 \n"
|
||||
" move $1, %z4 \n"
|
||||
" move $1, %z5 \n"
|
||||
" .set mips3 \n"
|
||||
"2: sc $1, %1 \n"
|
||||
"2: sc $1, %2 \n"
|
||||
" beqzl $1, 1b \n"
|
||||
__WEAK_LLSC_MB
|
||||
"3: \n"
|
||||
" .set pop \n"
|
||||
" .section .fixup,\"ax\" \n"
|
||||
"4: li %0, %5 \n"
|
||||
"4: li %0, %6 \n"
|
||||
" j 3b \n"
|
||||
" .previous \n"
|
||||
" .section __ex_table,\"a\" \n"
|
||||
" "__UA_ADDR "\t1b, 4b \n"
|
||||
" "__UA_ADDR "\t2b, 4b \n"
|
||||
" .previous \n"
|
||||
: "=&r" (retval), "=R" (*uaddr)
|
||||
: "+r" (ret), "=&r" (val), "=R" (*uaddr)
|
||||
: "R" (*uaddr), "Jr" (oldval), "Jr" (newval), "i" (-EFAULT)
|
||||
: "memory");
|
||||
} else if (cpu_has_llsc) {
|
||||
@ -172,31 +174,32 @@ futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
|
||||
" .set push \n"
|
||||
" .set noat \n"
|
||||
" .set mips3 \n"
|
||||
"1: ll %0, %2 \n"
|
||||
" bne %0, %z3, 3f \n"
|
||||
"1: ll %1, %3 \n"
|
||||
" bne %1, %z4, 3f \n"
|
||||
" .set mips0 \n"
|
||||
" move $1, %z4 \n"
|
||||
" move $1, %z5 \n"
|
||||
" .set mips3 \n"
|
||||
"2: sc $1, %1 \n"
|
||||
"2: sc $1, %2 \n"
|
||||
" beqz $1, 1b \n"
|
||||
__WEAK_LLSC_MB
|
||||
"3: \n"
|
||||
" .set pop \n"
|
||||
" .section .fixup,\"ax\" \n"
|
||||
"4: li %0, %5 \n"
|
||||
"4: li %0, %6 \n"
|
||||
" j 3b \n"
|
||||
" .previous \n"
|
||||
" .section __ex_table,\"a\" \n"
|
||||
" "__UA_ADDR "\t1b, 4b \n"
|
||||
" "__UA_ADDR "\t2b, 4b \n"
|
||||
" .previous \n"
|
||||
: "=&r" (retval), "=R" (*uaddr)
|
||||
: "+r" (ret), "=&r" (val), "=R" (*uaddr)
|
||||
: "R" (*uaddr), "Jr" (oldval), "Jr" (newval), "i" (-EFAULT)
|
||||
: "memory");
|
||||
} else
|
||||
return -ENOSYS;
|
||||
|
||||
return retval;
|
||||
*uval = val;
|
||||
return ret;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
@ -8,7 +8,7 @@
|
||||
#include <asm/errno.h>
|
||||
|
||||
static inline int
|
||||
futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
|
||||
futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr)
|
||||
{
|
||||
int op = (encoded_op >> 28) & 7;
|
||||
int cmp = (encoded_op >> 24) & 15;
|
||||
@ -18,7 +18,7 @@ futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
|
||||
if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
|
||||
oparg = 1 << oparg;
|
||||
|
||||
if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
|
||||
if (! access_ok (VERIFY_WRITE, uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
pagefault_disable();
|
||||
@ -51,10 +51,10 @@ futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
|
||||
|
||||
/* Non-atomic version */
|
||||
static inline int
|
||||
futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
|
||||
futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
|
||||
u32 oldval, u32 newval)
|
||||
{
|
||||
int err = 0;
|
||||
int uval;
|
||||
u32 val;
|
||||
|
||||
/* futex.c wants to do a cmpxchg_inatomic on kernel NULL, which is
|
||||
* our gateway page, and causes no end of trouble...
|
||||
@ -62,15 +62,15 @@ futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
|
||||
if (segment_eq(KERNEL_DS, get_fs()) && !uaddr)
|
||||
return -EFAULT;
|
||||
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
err = get_user(uval, uaddr);
|
||||
if (err) return -EFAULT;
|
||||
if (uval == oldval)
|
||||
err = put_user(newval, uaddr);
|
||||
if (err) return -EFAULT;
|
||||
return uval;
|
||||
if (get_user(val, uaddr))
|
||||
return -EFAULT;
|
||||
if (val == oldval && put_user(newval, uaddr))
|
||||
return -EFAULT;
|
||||
*uval = val;
|
||||
return 0;
|
||||
}
|
||||
|
||||
#endif /*__KERNEL__*/
|
||||
|
||||
@ -30,7 +30,7 @@
|
||||
: "b" (uaddr), "i" (-EFAULT), "r" (oparg) \
|
||||
: "cr0", "memory")
|
||||
|
||||
static inline int futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
|
||||
static inline int futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr)
|
||||
{
|
||||
int op = (encoded_op >> 28) & 7;
|
||||
int cmp = (encoded_op >> 24) & 15;
|
||||
@ -40,7 +40,7 @@ static inline int futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
|
||||
if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
|
||||
oparg = 1 << oparg;
|
||||
|
||||
if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
|
||||
if (! access_ok (VERIFY_WRITE, uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
pagefault_disable();
|
||||
@ -82,35 +82,38 @@ static inline int futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
|
||||
}
|
||||
|
||||
static inline int
|
||||
futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
|
||||
futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
|
||||
u32 oldval, u32 newval)
|
||||
{
|
||||
int prev;
|
||||
int ret = 0;
|
||||
u32 prev;
|
||||
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
__asm__ __volatile__ (
|
||||
PPC_RELEASE_BARRIER
|
||||
"1: lwarx %0,0,%2 # futex_atomic_cmpxchg_inatomic\n\
|
||||
cmpw 0,%0,%3\n\
|
||||
"1: lwarx %1,0,%3 # futex_atomic_cmpxchg_inatomic\n\
|
||||
cmpw 0,%1,%4\n\
|
||||
bne- 3f\n"
|
||||
PPC405_ERR77(0,%2)
|
||||
"2: stwcx. %4,0,%2\n\
|
||||
PPC405_ERR77(0,%3)
|
||||
"2: stwcx. %5,0,%3\n\
|
||||
bne- 1b\n"
|
||||
PPC_ACQUIRE_BARRIER
|
||||
"3: .section .fixup,\"ax\"\n\
|
||||
4: li %0,%5\n\
|
||||
4: li %0,%6\n\
|
||||
b 3b\n\
|
||||
.previous\n\
|
||||
.section __ex_table,\"a\"\n\
|
||||
.align 3\n\
|
||||
" PPC_LONG "1b,4b,2b,4b\n\
|
||||
.previous" \
|
||||
: "=&r" (prev), "+m" (*uaddr)
|
||||
: "+r" (ret), "=&r" (prev), "+m" (*uaddr)
|
||||
: "r" (uaddr), "r" (oldval), "r" (newval), "i" (-EFAULT)
|
||||
: "cc", "memory");
|
||||
|
||||
return prev;
|
||||
*uval = prev;
|
||||
return ret;
|
||||
}
|
||||
|
||||
#endif /* __KERNEL__ */
|
||||
|
||||
@ -7,7 +7,7 @@
|
||||
#include <linux/uaccess.h>
|
||||
#include <asm/errno.h>
|
||||
|
||||
static inline int futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
|
||||
static inline int futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr)
|
||||
{
|
||||
int op = (encoded_op >> 28) & 7;
|
||||
int cmp = (encoded_op >> 24) & 15;
|
||||
@ -18,7 +18,7 @@ static inline int futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
|
||||
if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
|
||||
oparg = 1 << oparg;
|
||||
|
||||
if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
|
||||
if (! access_ok (VERIFY_WRITE, uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
pagefault_disable();
|
||||
@ -39,13 +39,13 @@ static inline int futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
|
||||
return ret;
|
||||
}
|
||||
|
||||
static inline int futex_atomic_cmpxchg_inatomic(int __user *uaddr,
|
||||
int oldval, int newval)
|
||||
static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
|
||||
u32 oldval, u32 newval)
|
||||
{
|
||||
if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
|
||||
if (! access_ok (VERIFY_WRITE, uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
return uaccess.futex_atomic_cmpxchg(uaddr, oldval, newval);
|
||||
return uaccess.futex_atomic_cmpxchg(uval, uaddr, oldval, newval);
|
||||
}
|
||||
|
||||
#endif /* __KERNEL__ */
|
||||
|
||||
@ -83,8 +83,8 @@ struct uaccess_ops {
|
||||
size_t (*clear_user)(size_t, void __user *);
|
||||
size_t (*strnlen_user)(size_t, const char __user *);
|
||||
size_t (*strncpy_from_user)(size_t, const char __user *, char *);
|
||||
int (*futex_atomic_op)(int op, int __user *, int oparg, int *old);
|
||||
int (*futex_atomic_cmpxchg)(int __user *, int old, int new);
|
||||
int (*futex_atomic_op)(int op, u32 __user *, int oparg, int *old);
|
||||
int (*futex_atomic_cmpxchg)(u32 *, u32 __user *, u32 old, u32 new);
|
||||
};
|
||||
|
||||
extern struct uaccess_ops uaccess;
|
||||
|
||||
@ -12,12 +12,12 @@ extern size_t copy_from_user_std(size_t, const void __user *, void *);
|
||||
extern size_t copy_to_user_std(size_t, void __user *, const void *);
|
||||
extern size_t strnlen_user_std(size_t, const char __user *);
|
||||
extern size_t strncpy_from_user_std(size_t, const char __user *, char *);
|
||||
extern int futex_atomic_cmpxchg_std(int __user *, int, int);
|
||||
extern int futex_atomic_op_std(int, int __user *, int, int *);
|
||||
extern int futex_atomic_cmpxchg_std(u32 *, u32 __user *, u32, u32);
|
||||
extern int futex_atomic_op_std(int, u32 __user *, int, int *);
|
||||
|
||||
extern size_t copy_from_user_pt(size_t, const void __user *, void *);
|
||||
extern size_t copy_to_user_pt(size_t, void __user *, const void *);
|
||||
extern int futex_atomic_op_pt(int, int __user *, int, int *);
|
||||
extern int futex_atomic_cmpxchg_pt(int __user *, int, int);
|
||||
extern int futex_atomic_op_pt(int, u32 __user *, int, int *);
|
||||
extern int futex_atomic_cmpxchg_pt(u32 *, u32 __user *, u32, u32);
|
||||
|
||||
#endif /* __ARCH_S390_LIB_UACCESS_H */
|
||||
|
||||
@ -302,7 +302,7 @@ fault:
|
||||
: "0" (-EFAULT), "d" (oparg), "a" (uaddr), \
|
||||
"m" (*uaddr) : "cc" );
|
||||
|
||||
static int __futex_atomic_op_pt(int op, int __user *uaddr, int oparg, int *old)
|
||||
static int __futex_atomic_op_pt(int op, u32 __user *uaddr, int oparg, int *old)
|
||||
{
|
||||
int oldval = 0, newval, ret;
|
||||
|
||||
@ -335,7 +335,7 @@ static int __futex_atomic_op_pt(int op, int __user *uaddr, int oparg, int *old)
|
||||
return ret;
|
||||
}
|
||||
|
||||
int futex_atomic_op_pt(int op, int __user *uaddr, int oparg, int *old)
|
||||
int futex_atomic_op_pt(int op, u32 __user *uaddr, int oparg, int *old)
|
||||
{
|
||||
int ret;
|
||||
|
||||
@ -354,26 +354,29 @@ int futex_atomic_op_pt(int op, int __user *uaddr, int oparg, int *old)
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int __futex_atomic_cmpxchg_pt(int __user *uaddr, int oldval, int newval)
|
||||
static int __futex_atomic_cmpxchg_pt(u32 *uval, u32 __user *uaddr,
|
||||
u32 oldval, u32 newval)
|
||||
{
|
||||
int ret;
|
||||
|
||||
asm volatile("0: cs %1,%4,0(%5)\n"
|
||||
"1: lr %0,%1\n"
|
||||
"1: la %0,0\n"
|
||||
"2:\n"
|
||||
EX_TABLE(0b,2b) EX_TABLE(1b,2b)
|
||||
: "=d" (ret), "+d" (oldval), "=m" (*uaddr)
|
||||
: "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr)
|
||||
: "cc", "memory" );
|
||||
*uval = oldval;
|
||||
return ret;
|
||||
}
|
||||
|
||||
int futex_atomic_cmpxchg_pt(int __user *uaddr, int oldval, int newval)
|
||||
int futex_atomic_cmpxchg_pt(u32 *uval, u32 __user *uaddr,
|
||||
u32 oldval, u32 newval)
|
||||
{
|
||||
int ret;
|
||||
|
||||
if (segment_eq(get_fs(), KERNEL_DS))
|
||||
return __futex_atomic_cmpxchg_pt(uaddr, oldval, newval);
|
||||
return __futex_atomic_cmpxchg_pt(uval, uaddr, oldval, newval);
|
||||
spin_lock(¤t->mm->page_table_lock);
|
||||
uaddr = (int __user *) __dat_user_addr((unsigned long) uaddr);
|
||||
if (!uaddr) {
|
||||
@ -382,7 +385,7 @@ int futex_atomic_cmpxchg_pt(int __user *uaddr, int oldval, int newval)
|
||||
}
|
||||
get_page(virt_to_page(uaddr));
|
||||
spin_unlock(¤t->mm->page_table_lock);
|
||||
ret = __futex_atomic_cmpxchg_pt(uaddr, oldval, newval);
|
||||
ret = __futex_atomic_cmpxchg_pt(uval, uaddr, oldval, newval);
|
||||
put_page(virt_to_page(uaddr));
|
||||
return ret;
|
||||
}
|
||||
|
||||
@ -255,7 +255,7 @@ size_t strncpy_from_user_std(size_t size, const char __user *src, char *dst)
|
||||
: "0" (-EFAULT), "d" (oparg), "a" (uaddr), \
|
||||
"m" (*uaddr) : "cc");
|
||||
|
||||
int futex_atomic_op_std(int op, int __user *uaddr, int oparg, int *old)
|
||||
int futex_atomic_op_std(int op, u32 __user *uaddr, int oparg, int *old)
|
||||
{
|
||||
int oldval = 0, newval, ret;
|
||||
|
||||
@ -287,19 +287,21 @@ int futex_atomic_op_std(int op, int __user *uaddr, int oparg, int *old)
|
||||
return ret;
|
||||
}
|
||||
|
||||
int futex_atomic_cmpxchg_std(int __user *uaddr, int oldval, int newval)
|
||||
int futex_atomic_cmpxchg_std(u32 *uval, u32 __user *uaddr,
|
||||
u32 oldval, u32 newval)
|
||||
{
|
||||
int ret;
|
||||
|
||||
asm volatile(
|
||||
" sacf 256\n"
|
||||
"0: cs %1,%4,0(%5)\n"
|
||||
"1: lr %0,%1\n"
|
||||
"1: la %0,0\n"
|
||||
"2: sacf 0\n"
|
||||
EX_TABLE(0b,2b) EX_TABLE(1b,2b)
|
||||
: "=d" (ret), "+d" (oldval), "=m" (*uaddr)
|
||||
: "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr)
|
||||
: "cc", "memory" );
|
||||
*uval = oldval;
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
||||
@ -3,7 +3,7 @@
|
||||
|
||||
#include <asm/system.h>
|
||||
|
||||
static inline int atomic_futex_op_xchg_set(int oparg, int __user *uaddr,
|
||||
static inline int atomic_futex_op_xchg_set(int oparg, u32 __user *uaddr,
|
||||
int *oldval)
|
||||
{
|
||||
unsigned long flags;
|
||||
@ -20,7 +20,7 @@ static inline int atomic_futex_op_xchg_set(int oparg, int __user *uaddr,
|
||||
return ret;
|
||||
}
|
||||
|
||||
static inline int atomic_futex_op_xchg_add(int oparg, int __user *uaddr,
|
||||
static inline int atomic_futex_op_xchg_add(int oparg, u32 __user *uaddr,
|
||||
int *oldval)
|
||||
{
|
||||
unsigned long flags;
|
||||
@ -37,7 +37,7 @@ static inline int atomic_futex_op_xchg_add(int oparg, int __user *uaddr,
|
||||
return ret;
|
||||
}
|
||||
|
||||
static inline int atomic_futex_op_xchg_or(int oparg, int __user *uaddr,
|
||||
static inline int atomic_futex_op_xchg_or(int oparg, u32 __user *uaddr,
|
||||
int *oldval)
|
||||
{
|
||||
unsigned long flags;
|
||||
@ -54,7 +54,7 @@ static inline int atomic_futex_op_xchg_or(int oparg, int __user *uaddr,
|
||||
return ret;
|
||||
}
|
||||
|
||||
static inline int atomic_futex_op_xchg_and(int oparg, int __user *uaddr,
|
||||
static inline int atomic_futex_op_xchg_and(int oparg, u32 __user *uaddr,
|
||||
int *oldval)
|
||||
{
|
||||
unsigned long flags;
|
||||
@ -71,7 +71,7 @@ static inline int atomic_futex_op_xchg_and(int oparg, int __user *uaddr,
|
||||
return ret;
|
||||
}
|
||||
|
||||
static inline int atomic_futex_op_xchg_xor(int oparg, int __user *uaddr,
|
||||
static inline int atomic_futex_op_xchg_xor(int oparg, u32 __user *uaddr,
|
||||
int *oldval)
|
||||
{
|
||||
unsigned long flags;
|
||||
@ -88,11 +88,13 @@ static inline int atomic_futex_op_xchg_xor(int oparg, int __user *uaddr,
|
||||
return ret;
|
||||
}
|
||||
|
||||
static inline int atomic_futex_op_cmpxchg_inatomic(int __user *uaddr,
|
||||
int oldval, int newval)
|
||||
static inline int atomic_futex_op_cmpxchg_inatomic(u32 *uval,
|
||||
u32 __user *uaddr,
|
||||
u32 oldval, u32 newval)
|
||||
{
|
||||
unsigned long flags;
|
||||
int ret, prev = 0;
|
||||
int ret;
|
||||
u32 prev = 0;
|
||||
|
||||
local_irq_save(flags);
|
||||
|
||||
@ -102,10 +104,8 @@ static inline int atomic_futex_op_cmpxchg_inatomic(int __user *uaddr,
|
||||
|
||||
local_irq_restore(flags);
|
||||
|
||||
if (ret)
|
||||
*uval = prev;
|
||||
return ret;
|
||||
|
||||
return prev;
|
||||
}
|
||||
|
||||
#endif /* __ASM_SH_FUTEX_IRQ_H */
|
||||
|
||||
@ -10,7 +10,7 @@
|
||||
/* XXX: UP variants, fix for SH-4A and SMP.. */
|
||||
#include <asm/futex-irq.h>
|
||||
|
||||
static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
|
||||
static inline int futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr)
|
||||
{
|
||||
int op = (encoded_op >> 28) & 7;
|
||||
int cmp = (encoded_op >> 24) & 15;
|
||||
@ -21,7 +21,7 @@ static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
|
||||
if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
|
||||
oparg = 1 << oparg;
|
||||
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
pagefault_disable();
|
||||
@ -65,12 +65,13 @@ static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
|
||||
}
|
||||
|
||||
static inline int
|
||||
futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
|
||||
futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
|
||||
u32 oldval, u32 newval)
|
||||
{
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
return atomic_futex_op_cmpxchg_inatomic(uaddr, oldval, newval);
|
||||
return atomic_futex_op_cmpxchg_inatomic(uval, uaddr, oldval, newval);
|
||||
}
|
||||
|
||||
#endif /* __KERNEL__ */
|
||||
|
||||
@ -30,7 +30,7 @@
|
||||
: "r" (uaddr), "r" (oparg), "i" (-EFAULT) \
|
||||
: "memory")
|
||||
|
||||
static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
|
||||
static inline int futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr)
|
||||
{
|
||||
int op = (encoded_op >> 28) & 7;
|
||||
int cmp = (encoded_op >> 24) & 15;
|
||||
@ -38,7 +38,7 @@ static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
|
||||
int cmparg = (encoded_op << 20) >> 20;
|
||||
int oldval = 0, ret, tem;
|
||||
|
||||
if (unlikely(!access_ok(VERIFY_WRITE, uaddr, sizeof(int))))
|
||||
if (unlikely(!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))))
|
||||
return -EFAULT;
|
||||
if (unlikely((((unsigned long) uaddr) & 0x3UL)))
|
||||
return -EINVAL;
|
||||
@ -85,26 +85,30 @@ static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
|
||||
}
|
||||
|
||||
static inline int
|
||||
futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
|
||||
futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
|
||||
u32 oldval, u32 newval)
|
||||
{
|
||||
int ret = 0;
|
||||
|
||||
__asm__ __volatile__(
|
||||
"\n1: casa [%3] %%asi, %2, %0\n"
|
||||
"\n1: casa [%4] %%asi, %3, %1\n"
|
||||
"2:\n"
|
||||
" .section .fixup,#alloc,#execinstr\n"
|
||||
" .align 4\n"
|
||||
"3: sethi %%hi(2b), %0\n"
|
||||
" jmpl %0 + %%lo(2b), %%g0\n"
|
||||
" mov %4, %0\n"
|
||||
" mov %5, %0\n"
|
||||
" .previous\n"
|
||||
" .section __ex_table,\"a\"\n"
|
||||
" .align 4\n"
|
||||
" .word 1b, 3b\n"
|
||||
" .previous\n"
|
||||
: "=r" (newval)
|
||||
: "0" (newval), "r" (oldval), "r" (uaddr), "i" (-EFAULT)
|
||||
: "+r" (ret), "=r" (newval)
|
||||
: "1" (newval), "r" (oldval), "r" (uaddr), "i" (-EFAULT)
|
||||
: "memory");
|
||||
|
||||
return newval;
|
||||
*uval = newval;
|
||||
return ret;
|
||||
}
|
||||
|
||||
#endif /* !(_SPARC64_FUTEX_H) */
|
||||
|
||||
@ -29,16 +29,16 @@
|
||||
#include <linux/uaccess.h>
|
||||
#include <linux/errno.h>
|
||||
|
||||
extern struct __get_user futex_set(int __user *v, int i);
|
||||
extern struct __get_user futex_add(int __user *v, int n);
|
||||
extern struct __get_user futex_or(int __user *v, int n);
|
||||
extern struct __get_user futex_andn(int __user *v, int n);
|
||||
extern struct __get_user futex_cmpxchg(int __user *v, int o, int n);
|
||||
extern struct __get_user futex_set(u32 __user *v, int i);
|
||||
extern struct __get_user futex_add(u32 __user *v, int n);
|
||||
extern struct __get_user futex_or(u32 __user *v, int n);
|
||||
extern struct __get_user futex_andn(u32 __user *v, int n);
|
||||
extern struct __get_user futex_cmpxchg(u32 __user *v, int o, int n);
|
||||
|
||||
#ifndef __tilegx__
|
||||
extern struct __get_user futex_xor(int __user *v, int n);
|
||||
extern struct __get_user futex_xor(u32 __user *v, int n);
|
||||
#else
|
||||
static inline struct __get_user futex_xor(int __user *uaddr, int n)
|
||||
static inline struct __get_user futex_xor(u32 __user *uaddr, int n)
|
||||
{
|
||||
struct __get_user asm_ret = __get_user_4(uaddr);
|
||||
if (!asm_ret.err) {
|
||||
@ -53,7 +53,7 @@ static inline struct __get_user futex_xor(int __user *uaddr, int n)
|
||||
}
|
||||
#endif
|
||||
|
||||
static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
|
||||
static inline int futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr)
|
||||
{
|
||||
int op = (encoded_op >> 28) & 7;
|
||||
int cmp = (encoded_op >> 24) & 15;
|
||||
@ -65,7 +65,7 @@ static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
|
||||
if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
|
||||
oparg = 1 << oparg;
|
||||
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
pagefault_disable();
|
||||
@ -119,16 +119,17 @@ static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
|
||||
return ret;
|
||||
}
|
||||
|
||||
static inline int futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval,
|
||||
int newval)
|
||||
static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
|
||||
u32 oldval, u32 newval)
|
||||
{
|
||||
struct __get_user asm_ret;
|
||||
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
asm_ret = futex_cmpxchg(uaddr, oldval, newval);
|
||||
return asm_ret.err ? asm_ret.err : asm_ret.val;
|
||||
*uval = asm_ret.val;
|
||||
return asm_ret.err;
|
||||
}
|
||||
|
||||
#ifndef __tilegx__
|
||||
|
||||
@ -37,7 +37,7 @@
|
||||
"+m" (*uaddr), "=&r" (tem) \
|
||||
: "r" (oparg), "i" (-EFAULT), "1" (0))
|
||||
|
||||
static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
|
||||
static inline int futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr)
|
||||
{
|
||||
int op = (encoded_op >> 28) & 7;
|
||||
int cmp = (encoded_op >> 24) & 15;
|
||||
@ -48,7 +48,7 @@ static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
|
||||
if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
|
||||
oparg = 1 << oparg;
|
||||
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
#if defined(CONFIG_X86_32) && !defined(CONFIG_X86_BSWAP)
|
||||
@ -109,9 +109,10 @@ static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
|
||||
return ret;
|
||||
}
|
||||
|
||||
static inline int futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval,
|
||||
int newval)
|
||||
static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
|
||||
u32 oldval, u32 newval)
|
||||
{
|
||||
int ret = 0;
|
||||
|
||||
#if defined(CONFIG_X86_32) && !defined(CONFIG_X86_BSWAP)
|
||||
/* Real i386 machines have no cmpxchg instruction */
|
||||
@ -119,21 +120,22 @@ static inline int futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval,
|
||||
return -ENOSYS;
|
||||
#endif
|
||||
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
|
||||
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
asm volatile("1:\t" LOCK_PREFIX "cmpxchgl %3, %1\n"
|
||||
asm volatile("1:\t" LOCK_PREFIX "cmpxchgl %4, %2\n"
|
||||
"2:\t.section .fixup, \"ax\"\n"
|
||||
"3:\tmov %2, %0\n"
|
||||
"3:\tmov %3, %0\n"
|
||||
"\tjmp 2b\n"
|
||||
"\t.previous\n"
|
||||
_ASM_EXTABLE(1b, 3b)
|
||||
: "=a" (oldval), "+m" (*uaddr)
|
||||
: "i" (-EFAULT), "r" (newval), "0" (oldval)
|
||||
: "+r" (ret), "=a" (oldval), "+m" (*uaddr)
|
||||
: "i" (-EFAULT), "r" (newval), "1" (oldval)
|
||||
: "memory"
|
||||
);
|
||||
|
||||
return oldval;
|
||||
*uval = oldval;
|
||||
return ret;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
@ -6,7 +6,7 @@
|
||||
#include <asm/errno.h>
|
||||
|
||||
static inline int
|
||||
futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
|
||||
futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr)
|
||||
{
|
||||
int op = (encoded_op >> 28) & 7;
|
||||
int cmp = (encoded_op >> 24) & 15;
|
||||
@ -16,7 +16,7 @@ futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
|
||||
if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
|
||||
oparg = 1 << oparg;
|
||||
|
||||
if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
|
||||
if (! access_ok (VERIFY_WRITE, uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
pagefault_disable();
|
||||
@ -48,7 +48,8 @@ futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
|
||||
}
|
||||
|
||||
static inline int
|
||||
futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
|
||||
futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
|
||||
u32 oldval, u32 newval)
|
||||
{
|
||||
return -ENOSYS;
|
||||
}
|
||||
|
||||
@ -31,15 +31,17 @@
|
||||
*
|
||||
* Simple ASCII art explanation:
|
||||
*
|
||||
* |HEAD |
|
||||
* | |
|
||||
* |prio_list.prev|<------------------------------------|
|
||||
* |prio_list.next|<->|pl|<->|pl|<--------------->|pl|<-|
|
||||
* |10 | |10| |21| |21| |21| |40| (prio)
|
||||
* | | | | | | | | | | | |
|
||||
* | | | | | | | | | | | |
|
||||
* |node_list.next|<->|nl|<->|nl|<->|nl|<->|nl|<->|nl|<-|
|
||||
* |node_list.prev|<------------------------------------|
|
||||
* pl:prio_list (only for plist_node)
|
||||
* nl:node_list
|
||||
* HEAD| NODE(S)
|
||||
* |
|
||||
* ||------------------------------------|
|
||||
* ||->|pl|<->|pl|<--------------->|pl|<-|
|
||||
* | |10| |21| |21| |21| |40| (prio)
|
||||
* | | | | | | | | | | |
|
||||
* | | | | | | | | | | |
|
||||
* |->|nl|<->|nl|<->|nl|<->|nl|<->|nl|<->|nl|<-|
|
||||
* |-------------------------------------------|
|
||||
*
|
||||
* The nodes on the prio_list list are sorted by priority to simplify
|
||||
* the insertion of new nodes. There are no nodes with duplicate
|
||||
@ -78,7 +80,6 @@
|
||||
#include <linux/spinlock_types.h>
|
||||
|
||||
struct plist_head {
|
||||
struct list_head prio_list;
|
||||
struct list_head node_list;
|
||||
#ifdef CONFIG_DEBUG_PI_LIST
|
||||
raw_spinlock_t *rawlock;
|
||||
@ -88,7 +89,8 @@ struct plist_head {
|
||||
|
||||
struct plist_node {
|
||||
int prio;
|
||||
struct plist_head plist;
|
||||
struct list_head prio_list;
|
||||
struct list_head node_list;
|
||||
};
|
||||
|
||||
#ifdef CONFIG_DEBUG_PI_LIST
|
||||
@ -100,7 +102,6 @@ struct plist_node {
|
||||
#endif
|
||||
|
||||
#define _PLIST_HEAD_INIT(head) \
|
||||
.prio_list = LIST_HEAD_INIT((head).prio_list), \
|
||||
.node_list = LIST_HEAD_INIT((head).node_list)
|
||||
|
||||
/**
|
||||
@ -133,7 +134,8 @@ struct plist_node {
|
||||
#define PLIST_NODE_INIT(node, __prio) \
|
||||
{ \
|
||||
.prio = (__prio), \
|
||||
.plist = { _PLIST_HEAD_INIT((node).plist) }, \
|
||||
.prio_list = LIST_HEAD_INIT((node).prio_list), \
|
||||
.node_list = LIST_HEAD_INIT((node).node_list), \
|
||||
}
|
||||
|
||||
/**
|
||||
@ -144,7 +146,6 @@ struct plist_node {
|
||||
static inline void
|
||||
plist_head_init(struct plist_head *head, spinlock_t *lock)
|
||||
{
|
||||
INIT_LIST_HEAD(&head->prio_list);
|
||||
INIT_LIST_HEAD(&head->node_list);
|
||||
#ifdef CONFIG_DEBUG_PI_LIST
|
||||
head->spinlock = lock;
|
||||
@ -160,7 +161,6 @@ plist_head_init(struct plist_head *head, spinlock_t *lock)
|
||||
static inline void
|
||||
plist_head_init_raw(struct plist_head *head, raw_spinlock_t *lock)
|
||||
{
|
||||
INIT_LIST_HEAD(&head->prio_list);
|
||||
INIT_LIST_HEAD(&head->node_list);
|
||||
#ifdef CONFIG_DEBUG_PI_LIST
|
||||
head->rawlock = lock;
|
||||
@ -176,7 +176,8 @@ plist_head_init_raw(struct plist_head *head, raw_spinlock_t *lock)
|
||||
static inline void plist_node_init(struct plist_node *node, int prio)
|
||||
{
|
||||
node->prio = prio;
|
||||
plist_head_init(&node->plist, NULL);
|
||||
INIT_LIST_HEAD(&node->prio_list);
|
||||
INIT_LIST_HEAD(&node->node_list);
|
||||
}
|
||||
|
||||
extern void plist_add(struct plist_node *node, struct plist_head *head);
|
||||
@ -188,7 +189,7 @@ extern void plist_del(struct plist_node *node, struct plist_head *head);
|
||||
* @head: the head for your list
|
||||
*/
|
||||
#define plist_for_each(pos, head) \
|
||||
list_for_each_entry(pos, &(head)->node_list, plist.node_list)
|
||||
list_for_each_entry(pos, &(head)->node_list, node_list)
|
||||
|
||||
/**
|
||||
* plist_for_each_safe - iterate safely over a plist of given type
|
||||
@ -199,7 +200,7 @@ extern void plist_del(struct plist_node *node, struct plist_head *head);
|
||||
* Iterate over a plist of given type, safe against removal of list entry.
|
||||
*/
|
||||
#define plist_for_each_safe(pos, n, head) \
|
||||
list_for_each_entry_safe(pos, n, &(head)->node_list, plist.node_list)
|
||||
list_for_each_entry_safe(pos, n, &(head)->node_list, node_list)
|
||||
|
||||
/**
|
||||
* plist_for_each_entry - iterate over list of given type
|
||||
@ -208,7 +209,7 @@ extern void plist_del(struct plist_node *node, struct plist_head *head);
|
||||
* @mem: the name of the list_struct within the struct
|
||||
*/
|
||||
#define plist_for_each_entry(pos, head, mem) \
|
||||
list_for_each_entry(pos, &(head)->node_list, mem.plist.node_list)
|
||||
list_for_each_entry(pos, &(head)->node_list, mem.node_list)
|
||||
|
||||
/**
|
||||
* plist_for_each_entry_safe - iterate safely over list of given type
|
||||
@ -220,7 +221,7 @@ extern void plist_del(struct plist_node *node, struct plist_head *head);
|
||||
* Iterate over list of given type, safe against removal of list entry.
|
||||
*/
|
||||
#define plist_for_each_entry_safe(pos, n, head, m) \
|
||||
list_for_each_entry_safe(pos, n, &(head)->node_list, m.plist.node_list)
|
||||
list_for_each_entry_safe(pos, n, &(head)->node_list, m.node_list)
|
||||
|
||||
/**
|
||||
* plist_head_empty - return !0 if a plist_head is empty
|
||||
@ -237,7 +238,7 @@ static inline int plist_head_empty(const struct plist_head *head)
|
||||
*/
|
||||
static inline int plist_node_empty(const struct plist_node *node)
|
||||
{
|
||||
return plist_head_empty(&node->plist);
|
||||
return list_empty(&node->node_list);
|
||||
}
|
||||
|
||||
/* All functions below assume the plist_head is not empty. */
|
||||
@ -285,7 +286,7 @@ static inline int plist_node_empty(const struct plist_node *node)
|
||||
static inline struct plist_node *plist_first(const struct plist_head *head)
|
||||
{
|
||||
return list_entry(head->node_list.next,
|
||||
struct plist_node, plist.node_list);
|
||||
struct plist_node, node_list);
|
||||
}
|
||||
|
||||
/**
|
||||
@ -297,7 +298,7 @@ static inline struct plist_node *plist_first(const struct plist_head *head)
|
||||
static inline struct plist_node *plist_last(const struct plist_head *head)
|
||||
{
|
||||
return list_entry(head->node_list.prev,
|
||||
struct plist_node, plist.node_list);
|
||||
struct plist_node, node_list);
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
123
kernel/futex.c
123
kernel/futex.c
@ -381,15 +381,16 @@ static struct futex_q *futex_top_waiter(struct futex_hash_bucket *hb,
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static u32 cmpxchg_futex_value_locked(u32 __user *uaddr, u32 uval, u32 newval)
|
||||
static int cmpxchg_futex_value_locked(u32 *curval, u32 __user *uaddr,
|
||||
u32 uval, u32 newval)
|
||||
{
|
||||
u32 curval;
|
||||
int ret;
|
||||
|
||||
pagefault_disable();
|
||||
curval = futex_atomic_cmpxchg_inatomic(uaddr, uval, newval);
|
||||
ret = futex_atomic_cmpxchg_inatomic(curval, uaddr, uval, newval);
|
||||
pagefault_enable();
|
||||
|
||||
return curval;
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int get_futex_value_locked(u32 *dest, u32 __user *from)
|
||||
@ -674,7 +675,7 @@ static int futex_lock_pi_atomic(u32 __user *uaddr, struct futex_hash_bucket *hb,
|
||||
struct task_struct *task, int set_waiters)
|
||||
{
|
||||
int lock_taken, ret, ownerdied = 0;
|
||||
u32 uval, newval, curval;
|
||||
u32 uval, newval, curval, vpid = task_pid_vnr(task);
|
||||
|
||||
retry:
|
||||
ret = lock_taken = 0;
|
||||
@ -684,19 +685,17 @@ retry:
|
||||
* (by doing a 0 -> TID atomic cmpxchg), while holding all
|
||||
* the locks. It will most likely not succeed.
|
||||
*/
|
||||
newval = task_pid_vnr(task);
|
||||
newval = vpid;
|
||||
if (set_waiters)
|
||||
newval |= FUTEX_WAITERS;
|
||||
|
||||
curval = cmpxchg_futex_value_locked(uaddr, 0, newval);
|
||||
|
||||
if (unlikely(curval == -EFAULT))
|
||||
if (unlikely(cmpxchg_futex_value_locked(&curval, uaddr, 0, newval)))
|
||||
return -EFAULT;
|
||||
|
||||
/*
|
||||
* Detect deadlocks.
|
||||
*/
|
||||
if ((unlikely((curval & FUTEX_TID_MASK) == task_pid_vnr(task))))
|
||||
if ((unlikely((curval & FUTEX_TID_MASK) == vpid)))
|
||||
return -EDEADLK;
|
||||
|
||||
/*
|
||||
@ -723,14 +722,12 @@ retry:
|
||||
*/
|
||||
if (unlikely(ownerdied || !(curval & FUTEX_TID_MASK))) {
|
||||
/* Keep the OWNER_DIED bit */
|
||||
newval = (curval & ~FUTEX_TID_MASK) | task_pid_vnr(task);
|
||||
newval = (curval & ~FUTEX_TID_MASK) | vpid;
|
||||
ownerdied = 0;
|
||||
lock_taken = 1;
|
||||
}
|
||||
|
||||
curval = cmpxchg_futex_value_locked(uaddr, uval, newval);
|
||||
|
||||
if (unlikely(curval == -EFAULT))
|
||||
if (unlikely(cmpxchg_futex_value_locked(&curval, uaddr, uval, newval)))
|
||||
return -EFAULT;
|
||||
if (unlikely(curval != uval))
|
||||
goto retry;
|
||||
@ -775,6 +772,24 @@ retry:
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* __unqueue_futex() - Remove the futex_q from its futex_hash_bucket
|
||||
* @q: The futex_q to unqueue
|
||||
*
|
||||
* The q->lock_ptr must not be NULL and must be held by the caller.
|
||||
*/
|
||||
static void __unqueue_futex(struct futex_q *q)
|
||||
{
|
||||
struct futex_hash_bucket *hb;
|
||||
|
||||
if (WARN_ON(!q->lock_ptr || !spin_is_locked(q->lock_ptr)
|
||||
|| plist_node_empty(&q->list)))
|
||||
return;
|
||||
|
||||
hb = container_of(q->lock_ptr, struct futex_hash_bucket, lock);
|
||||
plist_del(&q->list, &hb->chain);
|
||||
}
|
||||
|
||||
/*
|
||||
* The hash bucket lock must be held when this is called.
|
||||
* Afterwards, the futex_q must not be accessed.
|
||||
@ -792,7 +807,7 @@ static void wake_futex(struct futex_q *q)
|
||||
*/
|
||||
get_task_struct(p);
|
||||
|
||||
plist_del(&q->list, &q->list.plist);
|
||||
__unqueue_futex(q);
|
||||
/*
|
||||
* The waiting task can free the futex_q as soon as
|
||||
* q->lock_ptr = NULL is written, without taking any locks. A
|
||||
@ -843,9 +858,7 @@ static int wake_futex_pi(u32 __user *uaddr, u32 uval, struct futex_q *this)
|
||||
|
||||
newval = FUTEX_WAITERS | task_pid_vnr(new_owner);
|
||||
|
||||
curval = cmpxchg_futex_value_locked(uaddr, uval, newval);
|
||||
|
||||
if (curval == -EFAULT)
|
||||
if (cmpxchg_futex_value_locked(&curval, uaddr, uval, newval))
|
||||
ret = -EFAULT;
|
||||
else if (curval != uval)
|
||||
ret = -EINVAL;
|
||||
@ -880,10 +893,8 @@ static int unlock_futex_pi(u32 __user *uaddr, u32 uval)
|
||||
* There is no waiter, so we unlock the futex. The owner died
|
||||
* bit has not to be preserved here. We are the owner:
|
||||
*/
|
||||
oldval = cmpxchg_futex_value_locked(uaddr, uval, 0);
|
||||
|
||||
if (oldval == -EFAULT)
|
||||
return oldval;
|
||||
if (cmpxchg_futex_value_locked(&oldval, uaddr, uval, 0))
|
||||
return -EFAULT;
|
||||
if (oldval != uval)
|
||||
return -EAGAIN;
|
||||
|
||||
@ -1071,9 +1082,6 @@ void requeue_futex(struct futex_q *q, struct futex_hash_bucket *hb1,
|
||||
plist_del(&q->list, &hb1->chain);
|
||||
plist_add(&q->list, &hb2->chain);
|
||||
q->lock_ptr = &hb2->lock;
|
||||
#ifdef CONFIG_DEBUG_PI_LIST
|
||||
q->list.plist.spinlock = &hb2->lock;
|
||||
#endif
|
||||
}
|
||||
get_futex_key_refs(key2);
|
||||
q->key = *key2;
|
||||
@ -1100,16 +1108,12 @@ void requeue_pi_wake_futex(struct futex_q *q, union futex_key *key,
|
||||
get_futex_key_refs(key);
|
||||
q->key = *key;
|
||||
|
||||
WARN_ON(plist_node_empty(&q->list));
|
||||
plist_del(&q->list, &q->list.plist);
|
||||
__unqueue_futex(q);
|
||||
|
||||
WARN_ON(!q->rt_waiter);
|
||||
q->rt_waiter = NULL;
|
||||
|
||||
q->lock_ptr = &hb->lock;
|
||||
#ifdef CONFIG_DEBUG_PI_LIST
|
||||
q->list.plist.spinlock = &hb->lock;
|
||||
#endif
|
||||
|
||||
wake_up_state(q->task, TASK_NORMAL);
|
||||
}
|
||||
@ -1457,9 +1461,6 @@ static inline void queue_me(struct futex_q *q, struct futex_hash_bucket *hb)
|
||||
prio = min(current->normal_prio, MAX_RT_PRIO);
|
||||
|
||||
plist_node_init(&q->list, prio);
|
||||
#ifdef CONFIG_DEBUG_PI_LIST
|
||||
q->list.plist.spinlock = &hb->lock;
|
||||
#endif
|
||||
plist_add(&q->list, &hb->chain);
|
||||
q->task = current;
|
||||
spin_unlock(&hb->lock);
|
||||
@ -1504,8 +1505,7 @@ retry:
|
||||
spin_unlock(lock_ptr);
|
||||
goto retry;
|
||||
}
|
||||
WARN_ON(plist_node_empty(&q->list));
|
||||
plist_del(&q->list, &q->list.plist);
|
||||
__unqueue_futex(q);
|
||||
|
||||
BUG_ON(q->pi_state);
|
||||
|
||||
@ -1525,8 +1525,7 @@ retry:
|
||||
static void unqueue_me_pi(struct futex_q *q)
|
||||
__releases(q->lock_ptr)
|
||||
{
|
||||
WARN_ON(plist_node_empty(&q->list));
|
||||
plist_del(&q->list, &q->list.plist);
|
||||
__unqueue_futex(q);
|
||||
|
||||
BUG_ON(!q->pi_state);
|
||||
free_pi_state(q->pi_state);
|
||||
@ -1578,9 +1577,7 @@ retry:
|
||||
while (1) {
|
||||
newval = (uval & FUTEX_OWNER_DIED) | newtid;
|
||||
|
||||
curval = cmpxchg_futex_value_locked(uaddr, uval, newval);
|
||||
|
||||
if (curval == -EFAULT)
|
||||
if (cmpxchg_futex_value_locked(&curval, uaddr, uval, newval))
|
||||
goto handle_fault;
|
||||
if (curval == uval)
|
||||
break;
|
||||
@ -1781,13 +1778,14 @@ static int futex_wait_setup(u32 __user *uaddr, u32 val, unsigned int flags,
|
||||
*
|
||||
* The basic logical guarantee of a futex is that it blocks ONLY
|
||||
* if cond(var) is known to be true at the time of blocking, for
|
||||
* any cond. If we queued after testing *uaddr, that would open
|
||||
* a race condition where we could block indefinitely with
|
||||
* any cond. If we locked the hash-bucket after testing *uaddr, that
|
||||
* would open a race condition where we could block indefinitely with
|
||||
* cond(var) false, which would violate the guarantee.
|
||||
*
|
||||
* A consequence is that futex_wait() can return zero and absorb
|
||||
* a wakeup when *uaddr != val on entry to the syscall. This is
|
||||
* rare, but normal.
|
||||
* On the other hand, we insert q and release the hash-bucket only
|
||||
* after testing *uaddr. This guarantees that futex_wait() will NOT
|
||||
* absorb a wakeup if *uaddr does not match the desired values
|
||||
* while the syscall executes.
|
||||
*/
|
||||
retry:
|
||||
ret = get_futex_key(uaddr, flags & FLAGS_SHARED, &q->key);
|
||||
@ -2046,9 +2044,9 @@ static int futex_unlock_pi(u32 __user *uaddr, unsigned int flags)
|
||||
{
|
||||
struct futex_hash_bucket *hb;
|
||||
struct futex_q *this, *next;
|
||||
u32 uval;
|
||||
struct plist_head *head;
|
||||
union futex_key key = FUTEX_KEY_INIT;
|
||||
u32 uval, vpid = task_pid_vnr(current);
|
||||
int ret;
|
||||
|
||||
retry:
|
||||
@ -2057,7 +2055,7 @@ retry:
|
||||
/*
|
||||
* We release only a lock we actually own:
|
||||
*/
|
||||
if ((uval & FUTEX_TID_MASK) != task_pid_vnr(current))
|
||||
if ((uval & FUTEX_TID_MASK) != vpid)
|
||||
return -EPERM;
|
||||
|
||||
ret = get_futex_key(uaddr, flags & FLAGS_SHARED, &key);
|
||||
@ -2072,17 +2070,14 @@ retry:
|
||||
* again. If it succeeds then we can return without waking
|
||||
* anyone else up:
|
||||
*/
|
||||
if (!(uval & FUTEX_OWNER_DIED))
|
||||
uval = cmpxchg_futex_value_locked(uaddr, task_pid_vnr(current), 0);
|
||||
|
||||
|
||||
if (unlikely(uval == -EFAULT))
|
||||
if (!(uval & FUTEX_OWNER_DIED) &&
|
||||
cmpxchg_futex_value_locked(&uval, uaddr, vpid, 0))
|
||||
goto pi_faulted;
|
||||
/*
|
||||
* Rare case: we managed to release the lock atomically,
|
||||
* no need to wake anyone else up:
|
||||
*/
|
||||
if (unlikely(uval == task_pid_vnr(current)))
|
||||
if (unlikely(uval == vpid))
|
||||
goto out_unlock;
|
||||
|
||||
/*
|
||||
@ -2167,7 +2162,7 @@ int handle_early_requeue_pi_wakeup(struct futex_hash_bucket *hb,
|
||||
* We were woken prior to requeue by a timeout or a signal.
|
||||
* Unqueue the futex_q and determine which it was.
|
||||
*/
|
||||
plist_del(&q->list, &q->list.plist);
|
||||
plist_del(&q->list, &hb->chain);
|
||||
|
||||
/* Handle spurious wakeups gracefully */
|
||||
ret = -EWOULDBLOCK;
|
||||
@ -2463,11 +2458,20 @@ retry:
|
||||
* userspace.
|
||||
*/
|
||||
mval = (uval & FUTEX_WAITERS) | FUTEX_OWNER_DIED;
|
||||
nval = futex_atomic_cmpxchg_inatomic(uaddr, uval, mval);
|
||||
|
||||
if (nval == -EFAULT)
|
||||
/*
|
||||
* We are not holding a lock here, but we want to have
|
||||
* the pagefault_disable/enable() protection because
|
||||
* we want to handle the fault gracefully. If the
|
||||
* access fails we try to fault in the futex with R/W
|
||||
* verification via get_user_pages. get_user() above
|
||||
* does not guarantee R/W access. If that fails we
|
||||
* give up and leave the futex locked.
|
||||
*/
|
||||
if (cmpxchg_futex_value_locked(&nval, uaddr, uval, mval)) {
|
||||
if (fault_in_user_writeable(uaddr))
|
||||
return -1;
|
||||
|
||||
goto retry;
|
||||
}
|
||||
if (nval != uval)
|
||||
goto retry;
|
||||
|
||||
@ -2678,8 +2682,7 @@ static int __init futex_init(void)
|
||||
* implementation, the non-functional ones will return
|
||||
* -ENOSYS.
|
||||
*/
|
||||
curval = cmpxchg_futex_value_locked(NULL, 0, 0);
|
||||
if (curval == -EFAULT)
|
||||
if (cmpxchg_futex_value_locked(&curval, NULL, 0, 0) == -EFAULT)
|
||||
futex_cmpxchg_enabled = 1;
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(futex_queues); i++) {
|
||||
|
||||
135
lib/plist.c
135
lib/plist.c
@ -28,6 +28,8 @@
|
||||
|
||||
#ifdef CONFIG_DEBUG_PI_LIST
|
||||
|
||||
static struct plist_head test_head;
|
||||
|
||||
static void plist_check_prev_next(struct list_head *t, struct list_head *p,
|
||||
struct list_head *n)
|
||||
{
|
||||
@ -54,12 +56,13 @@ static void plist_check_list(struct list_head *top)
|
||||
|
||||
static void plist_check_head(struct plist_head *head)
|
||||
{
|
||||
WARN_ON(!head->rawlock && !head->spinlock);
|
||||
WARN_ON(head != &test_head && !head->rawlock && !head->spinlock);
|
||||
if (head->rawlock)
|
||||
WARN_ON_SMP(!raw_spin_is_locked(head->rawlock));
|
||||
if (head->spinlock)
|
||||
WARN_ON_SMP(!spin_is_locked(head->spinlock));
|
||||
plist_check_list(&head->prio_list);
|
||||
if (!plist_head_empty(head))
|
||||
plist_check_list(&plist_first(head)->prio_list);
|
||||
plist_check_list(&head->node_list);
|
||||
}
|
||||
|
||||
@ -75,25 +78,33 @@ static void plist_check_head(struct plist_head *head)
|
||||
*/
|
||||
void plist_add(struct plist_node *node, struct plist_head *head)
|
||||
{
|
||||
struct plist_node *iter;
|
||||
struct plist_node *first, *iter, *prev = NULL;
|
||||
struct list_head *node_next = &head->node_list;
|
||||
|
||||
plist_check_head(head);
|
||||
WARN_ON(!plist_node_empty(node));
|
||||
WARN_ON(!list_empty(&node->prio_list));
|
||||
|
||||
list_for_each_entry(iter, &head->prio_list, plist.prio_list) {
|
||||
if (node->prio < iter->prio)
|
||||
goto lt_prio;
|
||||
else if (node->prio == iter->prio) {
|
||||
iter = list_entry(iter->plist.prio_list.next,
|
||||
struct plist_node, plist.prio_list);
|
||||
goto eq_prio;
|
||||
}
|
||||
if (plist_head_empty(head))
|
||||
goto ins_node;
|
||||
|
||||
first = iter = plist_first(head);
|
||||
|
||||
do {
|
||||
if (node->prio < iter->prio) {
|
||||
node_next = &iter->node_list;
|
||||
break;
|
||||
}
|
||||
|
||||
lt_prio:
|
||||
list_add_tail(&node->plist.prio_list, &iter->plist.prio_list);
|
||||
eq_prio:
|
||||
list_add_tail(&node->plist.node_list, &iter->plist.node_list);
|
||||
prev = iter;
|
||||
iter = list_entry(iter->prio_list.next,
|
||||
struct plist_node, prio_list);
|
||||
} while (iter != first);
|
||||
|
||||
if (!prev || prev->prio != node->prio)
|
||||
list_add_tail(&node->prio_list, &iter->prio_list);
|
||||
ins_node:
|
||||
list_add_tail(&node->node_list, node_next);
|
||||
|
||||
plist_check_head(head);
|
||||
}
|
||||
@ -108,14 +119,98 @@ void plist_del(struct plist_node *node, struct plist_head *head)
|
||||
{
|
||||
plist_check_head(head);
|
||||
|
||||
if (!list_empty(&node->plist.prio_list)) {
|
||||
struct plist_node *next = plist_first(&node->plist);
|
||||
if (!list_empty(&node->prio_list)) {
|
||||
if (node->node_list.next != &head->node_list) {
|
||||
struct plist_node *next;
|
||||
|
||||
list_move_tail(&next->plist.prio_list, &node->plist.prio_list);
|
||||
list_del_init(&node->plist.prio_list);
|
||||
next = list_entry(node->node_list.next,
|
||||
struct plist_node, node_list);
|
||||
|
||||
/* add the next plist_node into prio_list */
|
||||
if (list_empty(&next->prio_list))
|
||||
list_add(&next->prio_list, &node->prio_list);
|
||||
}
|
||||
list_del_init(&node->prio_list);
|
||||
}
|
||||
|
||||
list_del_init(&node->plist.node_list);
|
||||
list_del_init(&node->node_list);
|
||||
|
||||
plist_check_head(head);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_DEBUG_PI_LIST
|
||||
#include <linux/sched.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/init.h>
|
||||
|
||||
static struct plist_node __initdata test_node[241];
|
||||
|
||||
static void __init plist_test_check(int nr_expect)
|
||||
{
|
||||
struct plist_node *first, *prio_pos, *node_pos;
|
||||
|
||||
if (plist_head_empty(&test_head)) {
|
||||
BUG_ON(nr_expect != 0);
|
||||
return;
|
||||
}
|
||||
|
||||
prio_pos = first = plist_first(&test_head);
|
||||
plist_for_each(node_pos, &test_head) {
|
||||
if (nr_expect-- < 0)
|
||||
break;
|
||||
if (node_pos == first)
|
||||
continue;
|
||||
if (node_pos->prio == prio_pos->prio) {
|
||||
BUG_ON(!list_empty(&node_pos->prio_list));
|
||||
continue;
|
||||
}
|
||||
|
||||
BUG_ON(prio_pos->prio > node_pos->prio);
|
||||
BUG_ON(prio_pos->prio_list.next != &node_pos->prio_list);
|
||||
prio_pos = node_pos;
|
||||
}
|
||||
|
||||
BUG_ON(nr_expect != 0);
|
||||
BUG_ON(prio_pos->prio_list.next != &first->prio_list);
|
||||
}
|
||||
|
||||
static int __init plist_test(void)
|
||||
{
|
||||
int nr_expect = 0, i, loop;
|
||||
unsigned int r = local_clock();
|
||||
|
||||
printk(KERN_INFO "start plist test\n");
|
||||
plist_head_init(&test_head, NULL);
|
||||
for (i = 0; i < ARRAY_SIZE(test_node); i++)
|
||||
plist_node_init(test_node + i, 0);
|
||||
|
||||
for (loop = 0; loop < 1000; loop++) {
|
||||
r = r * 193939 % 47629;
|
||||
i = r % ARRAY_SIZE(test_node);
|
||||
if (plist_node_empty(test_node + i)) {
|
||||
r = r * 193939 % 47629;
|
||||
test_node[i].prio = r % 99;
|
||||
plist_add(test_node + i, &test_head);
|
||||
nr_expect++;
|
||||
} else {
|
||||
plist_del(test_node + i, &test_head);
|
||||
nr_expect--;
|
||||
}
|
||||
plist_test_check(nr_expect);
|
||||
}
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(test_node); i++) {
|
||||
if (plist_node_empty(test_node + i))
|
||||
continue;
|
||||
plist_del(test_node + i, &test_head);
|
||||
nr_expect--;
|
||||
plist_test_check(nr_expect);
|
||||
}
|
||||
|
||||
printk(KERN_INFO "end plist test\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
module_init(plist_test);
|
||||
|
||||
#endif
|
||||
|
||||
Loading…
Reference in New Issue
Block a user