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[PATCH] powerpc: Merge futex.h

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This patch merges the ppc32 and ppc64 versions of futex.h, essentially
by taking the ppc64 version as the powerpc version.  The old ppc32
version did not implement the futex_atomic_op_inuser() callback (it
always returned -ENOSYS), so FUTEX_WAKE_OP would not work on ppc32.
In fact the ppc64 version of this function is almost suitable for
ppc32 as well - the only change needed is to extend ppc_asm.h with a
macro expanding to to the right pseudo-op to store a pointer (either
".long" or ".llong").

Built and booted on pSeries.  Built for 32-bit powermac.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
David Gibson 2005-11-02 13:58:22 +11:00 committed by Paul Mackerras
parent 847aeb6bad
commit 2ff2ae7a0d
3 changed files with 30 additions and 75 deletions
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45
include/asm-ppc64/futex.h → include/asm-powerpc/futex.h
View File

@ -1,5 +1,5 @@
#ifndef _ASM_FUTEX_H
#define _ASM_FUTEX_H
#ifndef _ASM_POWERPC_FUTEX_H
#define _ASM_POWERPC_FUTEX_H
#ifdef __KERNEL__
@ -7,28 +7,29 @@
#include <asm/errno.h>
#include <asm/synch.h>
#include <asm/uaccess.h>
#include <asm/ppc_asm.h>
#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \
__asm__ __volatile (SYNC_ON_SMP \
"1: lwarx %0,0,%2\n" \
insn \
"2: stwcx. %1,0,%2\n\
bne- 1b\n\
li %1,0\n\
3: .section .fixup,\"ax\"\n\
4: li %1,%3\n\
b 3b\n\
.previous\n\
.section __ex_table,\"a\"\n\
.align 3\n\
.llong 1b,4b,2b,4b\n\
.previous" \
: "=&r" (oldval), "=&r" (ret) \
: "b" (uaddr), "i" (-EFAULT), "1" (oparg) \
__asm__ __volatile ( \
SYNC_ON_SMP \
"1: lwarx %0,0,%2\n" \
insn \
"2: stwcx. %1,0,%2\n" \
"bne- 1b\n" \
"li %1,0\n" \
"3: .section .fixup,\"ax\"\n" \
"4: li %1,%3\n" \
"b 3b\n" \
".previous\n" \
".section __ex_table,\"a\"\n" \
".align 3\n" \
DATAL " 1b,4b,2b,4b\n" \
".previous" \
: "=&r" (oldval), "=&r" (ret) \
: "b" (uaddr), "i" (-EFAULT), "1" (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, int __user *uaddr)
{
int op = (encoded_op >> 28) & 7;
int cmp = (encoded_op >> 24) & 15;
@ -79,5 +80,5 @@ futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
return ret;
}
#endif
#endif
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_FUTEX_H */

7
include/asm-powerpc/ppc_asm.h
View File

@ -506,6 +506,13 @@ END_FTR_SECTION_IFCLR(CPU_FTR_601)
#else
#define __ASM_CONST(x) x##UL
#define ASM_CONST(x) __ASM_CONST(x)
#ifdef CONFIG_PPC64
#define DATAL ".llong"
#else
#define DATAL ".long"
#endif
#endif /* __ASSEMBLY__ */
#endif /* _ASM_POWERPC_PPC_ASM_H */

53
include/asm-ppc/futex.h
View File

@ -1,53 +0,0 @@
#ifndef _ASM_FUTEX_H
#define _ASM_FUTEX_H
#ifdef __KERNEL__
#include <linux/futex.h>
#include <asm/errno.h>
#include <asm/uaccess.h>
static inline int
futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
{
int op = (encoded_op >> 28) & 7;
int cmp = (encoded_op >> 24) & 15;
int oparg = (encoded_op << 8) >> 20;
int cmparg = (encoded_op << 20) >> 20;
int oldval = 0, ret;
if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
oparg = 1 << oparg;
if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
return -EFAULT;
inc_preempt_count();
switch (op) {
case FUTEX_OP_SET:
case FUTEX_OP_ADD:
case FUTEX_OP_OR:
case FUTEX_OP_ANDN:
case FUTEX_OP_XOR:
default:
ret = -ENOSYS;
}
dec_preempt_count();
if (!ret) {
switch (cmp) {
case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
default: ret = -ENOSYS;
}
}
return ret;
}
#endif
#endif