mirror of
https://github.com/torvalds/linux.git
synced 2024-11-21 19:41:42 +00:00
Merge branch 'rwonce/rework' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux
Pull READ/WRITE_ONCE rework from Will Deacon:
"This the READ_ONCE rework I've been working on for a while, which
bumps the minimum GCC version and improves code-gen on arm64 when
stack protector is enabled"
[ Side note: I'm _really_ tempted to raise the minimum gcc version to
4.9, so that we can just say that we require _Generic() support.
That would allow us to more cleanly handle a lot of the cases where we
depend on very complex macros with 'sizeof' or __builtin_choose_expr()
with __builtin_types_compatible_p() etc.
This branch has a workaround for sparse not handling _Generic(),
either, but that was already fixed in the sparse development branch,
so it's really just gcc-4.9 that we'd require. - Linus ]
* 'rwonce/rework' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux:
compiler_types.h: Use unoptimized __unqual_scalar_typeof for sparse
compiler_types.h: Optimize __unqual_scalar_typeof compilation time
compiler.h: Enforce that READ_ONCE_NOCHECK() access size is sizeof(long)
compiler-types.h: Include naked type in __pick_integer_type() match
READ_ONCE: Fix comment describing 2x32-bit atomicity
gcov: Remove old GCC 3.4 support
arm64: barrier: Use '__unqual_scalar_typeof' for acquire/release macros
locking/barriers: Use '__unqual_scalar_typeof' for load-acquire macros
READ_ONCE: Drop pointer qualifiers when reading from scalar types
READ_ONCE: Enforce atomicity for {READ,WRITE}_ONCE() memory accesses
READ_ONCE: Simplify implementations of {READ,WRITE}_ONCE()
arm64: csum: Disable KASAN for do_csum()
fault_inject: Don't rely on "return value" from WRITE_ONCE()
net: tls: Avoid assigning 'const' pointer to non-const pointer
netfilter: Avoid assigning 'const' pointer to non-const pointer
compiler/gcc: Raise minimum GCC version for kernel builds to 4.8
This commit is contained in:
Linus Torvalds
commit
4152d146ee
@ -29,7 +29,7 @@ you probably needn't concern yourself with pcmciautils.
|
||||
====================== =============== ========================================
|
||||
Program Minimal version Command to check the version
|
||||
====================== =============== ========================================
|
||||
GNU C 4.6 gcc --version
|
||||
GNU C 4.8 gcc --version
|
||||
GNU make 3.81 make --version
|
||||
binutils 2.23 ld -v
|
||||
flex 2.5.35 flex --version
|
||||
|
||||
@ -30,7 +30,7 @@ config CRYPTO_SHA1_ARM_NEON
|
||||
|
||||
config CRYPTO_SHA1_ARM_CE
|
||||
tristate "SHA1 digest algorithm (ARM v8 Crypto Extensions)"
|
||||
depends on KERNEL_MODE_NEON && (CC_IS_CLANG || GCC_VERSION >= 40800)
|
||||
depends on KERNEL_MODE_NEON
|
||||
select CRYPTO_SHA1_ARM
|
||||
select CRYPTO_HASH
|
||||
help
|
||||
@ -39,7 +39,7 @@ config CRYPTO_SHA1_ARM_CE
|
||||
|
||||
config CRYPTO_SHA2_ARM_CE
|
||||
tristate "SHA-224/256 digest algorithm (ARM v8 Crypto Extensions)"
|
||||
depends on KERNEL_MODE_NEON && (CC_IS_CLANG || GCC_VERSION >= 40800)
|
||||
depends on KERNEL_MODE_NEON
|
||||
select CRYPTO_SHA256_ARM
|
||||
select CRYPTO_HASH
|
||||
help
|
||||
@ -96,7 +96,7 @@ config CRYPTO_AES_ARM_BS
|
||||
|
||||
config CRYPTO_AES_ARM_CE
|
||||
tristate "Accelerated AES using ARMv8 Crypto Extensions"
|
||||
depends on KERNEL_MODE_NEON && (CC_IS_CLANG || GCC_VERSION >= 40800)
|
||||
depends on KERNEL_MODE_NEON
|
||||
select CRYPTO_SKCIPHER
|
||||
select CRYPTO_LIB_AES
|
||||
select CRYPTO_SIMD
|
||||
@ -106,7 +106,7 @@ config CRYPTO_AES_ARM_CE
|
||||
|
||||
config CRYPTO_GHASH_ARM_CE
|
||||
tristate "PMULL-accelerated GHASH using NEON/ARMv8 Crypto Extensions"
|
||||
depends on KERNEL_MODE_NEON && (CC_IS_CLANG || GCC_VERSION >= 40800)
|
||||
depends on KERNEL_MODE_NEON
|
||||
select CRYPTO_HASH
|
||||
select CRYPTO_CRYPTD
|
||||
select CRYPTO_GF128MUL
|
||||
@ -118,13 +118,13 @@ config CRYPTO_GHASH_ARM_CE
|
||||
|
||||
config CRYPTO_CRCT10DIF_ARM_CE
|
||||
tristate "CRCT10DIF digest algorithm using PMULL instructions"
|
||||
depends on KERNEL_MODE_NEON && (CC_IS_CLANG || GCC_VERSION >= 40800)
|
||||
depends on KERNEL_MODE_NEON
|
||||
depends on CRC_T10DIF
|
||||
select CRYPTO_HASH
|
||||
|
||||
config CRYPTO_CRC32_ARM_CE
|
||||
tristate "CRC32(C) digest algorithm using CRC and/or PMULL instructions"
|
||||
depends on KERNEL_MODE_NEON && (CC_IS_CLANG || GCC_VERSION >= 40800)
|
||||
depends on KERNEL_MODE_NEON
|
||||
depends on CRC32
|
||||
select CRYPTO_HASH
|
||||
|
||||
|
||||
@ -76,8 +76,8 @@ static inline unsigned long array_index_mask_nospec(unsigned long idx,
|
||||
#define __smp_store_release(p, v) \
|
||||
do { \
|
||||
typeof(p) __p = (p); \
|
||||
union { typeof(*p) __val; char __c[1]; } __u = \
|
||||
{ .__val = (__force typeof(*p)) (v) }; \
|
||||
union { __unqual_scalar_typeof(*p) __val; char __c[1]; } __u = \
|
||||
{ .__val = (__force __unqual_scalar_typeof(*p)) (v) }; \
|
||||
compiletime_assert_atomic_type(*p); \
|
||||
kasan_check_write(__p, sizeof(*p)); \
|
||||
switch (sizeof(*p)) { \
|
||||
@ -110,7 +110,7 @@ do { \
|
||||
|
||||
#define __smp_load_acquire(p) \
|
||||
({ \
|
||||
union { typeof(*p) __val; char __c[1]; } __u; \
|
||||
union { __unqual_scalar_typeof(*p) __val; char __c[1]; } __u; \
|
||||
typeof(p) __p = (p); \
|
||||
compiletime_assert_atomic_type(*p); \
|
||||
kasan_check_read(__p, sizeof(*p)); \
|
||||
@ -136,33 +136,33 @@ do { \
|
||||
: "Q" (*__p) : "memory"); \
|
||||
break; \
|
||||
} \
|
||||
__u.__val; \
|
||||
(typeof(*p))__u.__val; \
|
||||
})
|
||||
|
||||
#define smp_cond_load_relaxed(ptr, cond_expr) \
|
||||
({ \
|
||||
typeof(ptr) __PTR = (ptr); \
|
||||
typeof(*ptr) VAL; \
|
||||
__unqual_scalar_typeof(*ptr) VAL; \
|
||||
for (;;) { \
|
||||
VAL = READ_ONCE(*__PTR); \
|
||||
if (cond_expr) \
|
||||
break; \
|
||||
__cmpwait_relaxed(__PTR, VAL); \
|
||||
} \
|
||||
VAL; \
|
||||
(typeof(*ptr))VAL; \
|
||||
})
|
||||
|
||||
#define smp_cond_load_acquire(ptr, cond_expr) \
|
||||
({ \
|
||||
typeof(ptr) __PTR = (ptr); \
|
||||
typeof(*ptr) VAL; \
|
||||
__unqual_scalar_typeof(*ptr) VAL; \
|
||||
for (;;) { \
|
||||
VAL = smp_load_acquire(__PTR); \
|
||||
if (cond_expr) \
|
||||
break; \
|
||||
__cmpwait_relaxed(__PTR, VAL); \
|
||||
} \
|
||||
VAL; \
|
||||
(typeof(*ptr))VAL; \
|
||||
})
|
||||
|
||||
#include <asm-generic/barrier.h>
|
||||
|
||||
@ -14,7 +14,11 @@ static u64 accumulate(u64 sum, u64 data)
|
||||
return tmp + (tmp >> 64);
|
||||
}
|
||||
|
||||
unsigned int do_csum(const unsigned char *buff, int len)
|
||||
/*
|
||||
* We over-read the buffer and this makes KASAN unhappy. Instead, disable
|
||||
* instrumentation and call kasan explicitly.
|
||||
*/
|
||||
unsigned int __no_sanitize_address do_csum(const unsigned char *buff, int len)
|
||||
{
|
||||
unsigned int offset, shift, sum;
|
||||
const u64 *ptr;
|
||||
@ -42,7 +46,7 @@ unsigned int do_csum(const unsigned char *buff, int len)
|
||||
* odd/even alignment, and means we can ignore it until the very end.
|
||||
*/
|
||||
shift = offset * 8;
|
||||
data = READ_ONCE_NOCHECK(*ptr++);
|
||||
data = *ptr++;
|
||||
#ifdef __LITTLE_ENDIAN
|
||||
data = (data >> shift) << shift;
|
||||
#else
|
||||
@ -58,10 +62,10 @@ unsigned int do_csum(const unsigned char *buff, int len)
|
||||
while (unlikely(len > 64)) {
|
||||
__uint128_t tmp1, tmp2, tmp3, tmp4;
|
||||
|
||||
tmp1 = READ_ONCE_NOCHECK(*(__uint128_t *)ptr);
|
||||
tmp2 = READ_ONCE_NOCHECK(*(__uint128_t *)(ptr + 2));
|
||||
tmp3 = READ_ONCE_NOCHECK(*(__uint128_t *)(ptr + 4));
|
||||
tmp4 = READ_ONCE_NOCHECK(*(__uint128_t *)(ptr + 6));
|
||||
tmp1 = *(__uint128_t *)ptr;
|
||||
tmp2 = *(__uint128_t *)(ptr + 2);
|
||||
tmp3 = *(__uint128_t *)(ptr + 4);
|
||||
tmp4 = *(__uint128_t *)(ptr + 6);
|
||||
|
||||
len -= 64;
|
||||
ptr += 8;
|
||||
@ -85,7 +89,7 @@ unsigned int do_csum(const unsigned char *buff, int len)
|
||||
__uint128_t tmp;
|
||||
|
||||
sum64 = accumulate(sum64, data);
|
||||
tmp = READ_ONCE_NOCHECK(*(__uint128_t *)ptr);
|
||||
tmp = *(__uint128_t *)ptr;
|
||||
|
||||
len -= 16;
|
||||
ptr += 2;
|
||||
@ -100,7 +104,7 @@ unsigned int do_csum(const unsigned char *buff, int len)
|
||||
}
|
||||
if (len > 0) {
|
||||
sum64 = accumulate(sum64, data);
|
||||
data = READ_ONCE_NOCHECK(*ptr);
|
||||
data = *ptr;
|
||||
len -= 8;
|
||||
}
|
||||
/*
|
||||
|
||||
@ -316,7 +316,6 @@ config CRYPTO_AEGIS128
|
||||
config CRYPTO_AEGIS128_SIMD
|
||||
bool "Support SIMD acceleration for AEGIS-128"
|
||||
depends on CRYPTO_AEGIS128 && ((ARM || ARM64) && KERNEL_MODE_NEON)
|
||||
depends on !ARM || CC_IS_CLANG || GCC_VERSION >= 40800
|
||||
default y
|
||||
|
||||
config CRYPTO_AEGIS128_AESNI_SSE2
|
||||
|
||||
@ -64,7 +64,7 @@ static void xen_get_runstate_snapshot_cpu_delta(
|
||||
do {
|
||||
state_time = get64(&state->state_entry_time);
|
||||
rmb(); /* Hypervisor might update data. */
|
||||
*res = READ_ONCE(*state);
|
||||
*res = __READ_ONCE(*state);
|
||||
rmb(); /* Hypervisor might update data. */
|
||||
} while (get64(&state->state_entry_time) != state_time ||
|
||||
(state_time & XEN_RUNSTATE_UPDATE));
|
||||
|
||||
@ -128,10 +128,10 @@ do { \
|
||||
#ifndef __smp_load_acquire
|
||||
#define __smp_load_acquire(p) \
|
||||
({ \
|
||||
typeof(*p) ___p1 = READ_ONCE(*p); \
|
||||
__unqual_scalar_typeof(*p) ___p1 = READ_ONCE(*p); \
|
||||
compiletime_assert_atomic_type(*p); \
|
||||
__smp_mb(); \
|
||||
___p1; \
|
||||
(typeof(*p))___p1; \
|
||||
})
|
||||
#endif
|
||||
|
||||
@ -183,10 +183,10 @@ do { \
|
||||
#ifndef smp_load_acquire
|
||||
#define smp_load_acquire(p) \
|
||||
({ \
|
||||
typeof(*p) ___p1 = READ_ONCE(*p); \
|
||||
__unqual_scalar_typeof(*p) ___p1 = READ_ONCE(*p); \
|
||||
compiletime_assert_atomic_type(*p); \
|
||||
barrier(); \
|
||||
___p1; \
|
||||
(typeof(*p))___p1; \
|
||||
})
|
||||
#endif
|
||||
|
||||
@ -229,14 +229,14 @@ do { \
|
||||
#ifndef smp_cond_load_relaxed
|
||||
#define smp_cond_load_relaxed(ptr, cond_expr) ({ \
|
||||
typeof(ptr) __PTR = (ptr); \
|
||||
typeof(*ptr) VAL; \
|
||||
__unqual_scalar_typeof(*ptr) VAL; \
|
||||
for (;;) { \
|
||||
VAL = READ_ONCE(*__PTR); \
|
||||
if (cond_expr) \
|
||||
break; \
|
||||
cpu_relax(); \
|
||||
} \
|
||||
VAL; \
|
||||
(typeof(*ptr))VAL; \
|
||||
})
|
||||
#endif
|
||||
|
||||
@ -250,10 +250,10 @@ do { \
|
||||
*/
|
||||
#ifndef smp_cond_load_acquire
|
||||
#define smp_cond_load_acquire(ptr, cond_expr) ({ \
|
||||
typeof(*ptr) _val; \
|
||||
__unqual_scalar_typeof(*ptr) _val; \
|
||||
_val = smp_cond_load_relaxed(ptr, cond_expr); \
|
||||
smp_acquire__after_ctrl_dep(); \
|
||||
_val; \
|
||||
(typeof(*ptr))_val; \
|
||||
})
|
||||
#endif
|
||||
|
||||
|
||||
@ -10,7 +10,8 @@
|
||||
+ __GNUC_MINOR__ * 100 \
|
||||
+ __GNUC_PATCHLEVEL__)
|
||||
|
||||
#if GCC_VERSION < 40600
|
||||
/* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145 */
|
||||
#if GCC_VERSION < 40800
|
||||
# error Sorry, your compiler is too old - please upgrade it.
|
||||
#endif
|
||||
|
||||
@ -126,9 +127,7 @@
|
||||
#if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP) && !defined(__CHECKER__)
|
||||
#define __HAVE_BUILTIN_BSWAP32__
|
||||
#define __HAVE_BUILTIN_BSWAP64__
|
||||
#if GCC_VERSION >= 40800
|
||||
#define __HAVE_BUILTIN_BSWAP16__
|
||||
#endif
|
||||
#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP && !__CHECKER__ */
|
||||
|
||||
#if GCC_VERSION >= 70000
|
||||
|
||||
@ -230,60 +230,6 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
|
||||
# define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __LINE__)
|
||||
#endif
|
||||
|
||||
#include <uapi/linux/types.h>
|
||||
|
||||
#define __READ_ONCE_SIZE \
|
||||
({ \
|
||||
switch (size) { \
|
||||
case 1: *(__u8 *)res = *(volatile __u8 *)p; break; \
|
||||
case 2: *(__u16 *)res = *(volatile __u16 *)p; break; \
|
||||
case 4: *(__u32 *)res = *(volatile __u32 *)p; break; \
|
||||
case 8: *(__u64 *)res = *(volatile __u64 *)p; break; \
|
||||
default: \
|
||||
barrier(); \
|
||||
__builtin_memcpy((void *)res, (const void *)p, size); \
|
||||
barrier(); \
|
||||
} \
|
||||
})
|
||||
|
||||
static __always_inline
|
||||
void __read_once_size(const volatile void *p, void *res, int size)
|
||||
{
|
||||
__READ_ONCE_SIZE;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_KASAN
|
||||
/*
|
||||
* We can't declare function 'inline' because __no_sanitize_address confilcts
|
||||
* with inlining. Attempt to inline it may cause a build failure.
|
||||
* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67368
|
||||
* '__maybe_unused' allows us to avoid defined-but-not-used warnings.
|
||||
*/
|
||||
# define __no_kasan_or_inline __no_sanitize_address notrace __maybe_unused
|
||||
#else
|
||||
# define __no_kasan_or_inline __always_inline
|
||||
#endif
|
||||
|
||||
static __no_kasan_or_inline
|
||||
void __read_once_size_nocheck(const volatile void *p, void *res, int size)
|
||||
{
|
||||
__READ_ONCE_SIZE;
|
||||
}
|
||||
|
||||
static __always_inline void __write_once_size(volatile void *p, void *res, int size)
|
||||
{
|
||||
switch (size) {
|
||||
case 1: *(volatile __u8 *)p = *(__u8 *)res; break;
|
||||
case 2: *(volatile __u16 *)p = *(__u16 *)res; break;
|
||||
case 4: *(volatile __u32 *)p = *(__u32 *)res; break;
|
||||
case 8: *(volatile __u64 *)p = *(__u64 *)res; break;
|
||||
default:
|
||||
barrier();
|
||||
__builtin_memcpy((void *)p, (const void *)res, size);
|
||||
barrier();
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Prevent the compiler from merging or refetching reads or writes. The
|
||||
* compiler is also forbidden from reordering successive instances of
|
||||
@ -293,11 +239,7 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s
|
||||
* statements.
|
||||
*
|
||||
* These two macros will also work on aggregate data types like structs or
|
||||
* unions. If the size of the accessed data type exceeds the word size of
|
||||
* the machine (e.g., 32 bits or 64 bits) READ_ONCE() and WRITE_ONCE() will
|
||||
* fall back to memcpy(). There's at least two memcpy()s: one for the
|
||||
* __builtin_memcpy() and then one for the macro doing the copy of variable
|
||||
* - '__u' allocated on the stack.
|
||||
* unions.
|
||||
*
|
||||
* Their two major use cases are: (1) Mediating communication between
|
||||
* process-level code and irq/NMI handlers, all running on the same CPU,
|
||||
@ -309,23 +251,69 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s
|
||||
#include <asm/barrier.h>
|
||||
#include <linux/kasan-checks.h>
|
||||
|
||||
#define __READ_ONCE(x, check) \
|
||||
/*
|
||||
* Use __READ_ONCE() instead of READ_ONCE() if you do not require any
|
||||
* atomicity or dependency ordering guarantees. Note that this may result
|
||||
* in tears!
|
||||
*/
|
||||
#define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x))
|
||||
|
||||
#define __READ_ONCE_SCALAR(x) \
|
||||
({ \
|
||||
union { typeof(x) __val; char __c[1]; } __u; \
|
||||
if (check) \
|
||||
__read_once_size(&(x), __u.__c, sizeof(x)); \
|
||||
else \
|
||||
__read_once_size_nocheck(&(x), __u.__c, sizeof(x)); \
|
||||
smp_read_barrier_depends(); /* Enforce dependency ordering from x */ \
|
||||
__u.__val; \
|
||||
__unqual_scalar_typeof(x) __x = __READ_ONCE(x); \
|
||||
smp_read_barrier_depends(); \
|
||||
(typeof(x))__x; \
|
||||
})
|
||||
#define READ_ONCE(x) __READ_ONCE(x, 1)
|
||||
|
||||
#define READ_ONCE(x) \
|
||||
({ \
|
||||
compiletime_assert_rwonce_type(x); \
|
||||
__READ_ONCE_SCALAR(x); \
|
||||
})
|
||||
|
||||
#define __WRITE_ONCE(x, val) \
|
||||
do { \
|
||||
*(volatile typeof(x) *)&(x) = (val); \
|
||||
} while (0)
|
||||
|
||||
#define WRITE_ONCE(x, val) \
|
||||
do { \
|
||||
compiletime_assert_rwonce_type(x); \
|
||||
__WRITE_ONCE(x, val); \
|
||||
} while (0)
|
||||
|
||||
#ifdef CONFIG_KASAN
|
||||
/*
|
||||
* We can't declare function 'inline' because __no_sanitize_address conflicts
|
||||
* with inlining. Attempt to inline it may cause a build failure.
|
||||
* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67368
|
||||
* '__maybe_unused' allows us to avoid defined-but-not-used warnings.
|
||||
*/
|
||||
# define __no_kasan_or_inline __no_sanitize_address notrace __maybe_unused
|
||||
#else
|
||||
# define __no_kasan_or_inline __always_inline
|
||||
#endif
|
||||
|
||||
static __no_kasan_or_inline
|
||||
unsigned long __read_once_word_nocheck(const void *addr)
|
||||
{
|
||||
return __READ_ONCE(*(unsigned long *)addr);
|
||||
}
|
||||
|
||||
/*
|
||||
* Use READ_ONCE_NOCHECK() instead of READ_ONCE() if you need
|
||||
* to hide memory access from KASAN.
|
||||
* Use READ_ONCE_NOCHECK() instead of READ_ONCE() if you need to load a
|
||||
* word from memory atomically but without telling KASAN. This is usually
|
||||
* used by unwinding code when walking the stack of a running process.
|
||||
*/
|
||||
#define READ_ONCE_NOCHECK(x) __READ_ONCE(x, 0)
|
||||
#define READ_ONCE_NOCHECK(x) \
|
||||
({ \
|
||||
unsigned long __x; \
|
||||
compiletime_assert(sizeof(x) == sizeof(__x), \
|
||||
"Unsupported access size for READ_ONCE_NOCHECK()."); \
|
||||
__x = __read_once_word_nocheck(&(x)); \
|
||||
smp_read_barrier_depends(); \
|
||||
(typeof(x))__x; \
|
||||
})
|
||||
|
||||
static __no_kasan_or_inline
|
||||
unsigned long read_word_at_a_time(const void *addr)
|
||||
@ -334,14 +322,6 @@ unsigned long read_word_at_a_time(const void *addr)
|
||||
return *(unsigned long *)addr;
|
||||
}
|
||||
|
||||
#define WRITE_ONCE(x, val) \
|
||||
({ \
|
||||
union { typeof(x) __val; char __c[1]; } __u = \
|
||||
{ .__val = (__force typeof(x)) (val) }; \
|
||||
__write_once_size(&(x), __u.__c, sizeof(x)); \
|
||||
__u.__val; \
|
||||
})
|
||||
|
||||
#endif /* __KERNEL__ */
|
||||
|
||||
/*
|
||||
@ -406,6 +386,16 @@ static inline void *offset_to_ptr(const int *off)
|
||||
compiletime_assert(__native_word(t), \
|
||||
"Need native word sized stores/loads for atomicity.")
|
||||
|
||||
/*
|
||||
* Yes, this permits 64-bit accesses on 32-bit architectures. These will
|
||||
* actually be atomic in some cases (namely Armv7 + LPAE), but for others we
|
||||
* rely on the access being split into 2x32-bit accesses for a 32-bit quantity
|
||||
* (e.g. a virtual address) and a strong prevailing wind.
|
||||
*/
|
||||
#define compiletime_assert_rwonce_type(t) \
|
||||
compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
|
||||
"Unsupported access size for {READ,WRITE}_ONCE().")
|
||||
|
||||
/* &a[0] degrades to a pointer: a different type from an array */
|
||||
#define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
|
||||
|
||||
|
||||
@ -218,6 +218,53 @@ struct ftrace_likely_data {
|
||||
/* Are two types/vars the same type (ignoring qualifiers)? */
|
||||
#define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
|
||||
|
||||
/*
|
||||
* __unqual_scalar_typeof(x) - Declare an unqualified scalar type, leaving
|
||||
* non-scalar types unchanged.
|
||||
*/
|
||||
#if (defined(CONFIG_CC_IS_GCC) && CONFIG_GCC_VERSION < 40900) || defined(__CHECKER__)
|
||||
/*
|
||||
* We build this out of a couple of helper macros in a vain attempt to
|
||||
* help you keep your lunch down while reading it.
|
||||
*/
|
||||
#define __pick_scalar_type(x, type, otherwise) \
|
||||
__builtin_choose_expr(__same_type(x, type), (type)0, otherwise)
|
||||
|
||||
/*
|
||||
* 'char' is not type-compatible with either 'signed char' or 'unsigned char',
|
||||
* so we include the naked type here as well as the signed/unsigned variants.
|
||||
*/
|
||||
#define __pick_integer_type(x, type, otherwise) \
|
||||
__pick_scalar_type(x, type, \
|
||||
__pick_scalar_type(x, unsigned type, \
|
||||
__pick_scalar_type(x, signed type, otherwise)))
|
||||
|
||||
#define __unqual_scalar_typeof(x) typeof( \
|
||||
__pick_integer_type(x, char, \
|
||||
__pick_integer_type(x, short, \
|
||||
__pick_integer_type(x, int, \
|
||||
__pick_integer_type(x, long, \
|
||||
__pick_integer_type(x, long long, x))))))
|
||||
#else
|
||||
/*
|
||||
* If supported, prefer C11 _Generic for better compile-times. As above, 'char'
|
||||
* is not type-compatible with 'signed char', and we define a separate case.
|
||||
*/
|
||||
#define __scalar_type_to_expr_cases(type) \
|
||||
unsigned type: (unsigned type)0, \
|
||||
signed type: (signed type)0
|
||||
|
||||
#define __unqual_scalar_typeof(x) typeof( \
|
||||
_Generic((x), \
|
||||
char: (char)0, \
|
||||
__scalar_type_to_expr_cases(char), \
|
||||
__scalar_type_to_expr_cases(short), \
|
||||
__scalar_type_to_expr_cases(int), \
|
||||
__scalar_type_to_expr_cases(long), \
|
||||
__scalar_type_to_expr_cases(long long), \
|
||||
default: (x)))
|
||||
#endif
|
||||
|
||||
/* Is this type a native word size -- useful for atomic operations */
|
||||
#define __native_word(t) \
|
||||
(sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || \
|
||||
|
||||
@ -1293,7 +1293,6 @@ config LD_DEAD_CODE_DATA_ELIMINATION
|
||||
bool "Dead code and data elimination (EXPERIMENTAL)"
|
||||
depends on HAVE_LD_DEAD_CODE_DATA_ELIMINATION
|
||||
depends on EXPERT
|
||||
depends on !(FUNCTION_TRACER && CC_IS_GCC && GCC_VERSION < 40800)
|
||||
depends on $(cc-option,-ffunction-sections -fdata-sections)
|
||||
depends on $(ld-option,--gc-sections)
|
||||
help
|
||||
|
||||
@ -51,28 +51,4 @@ config GCOV_PROFILE_ALL
|
||||
larger and run slower. Also be sure to exclude files from profiling
|
||||
which are not linked to the kernel image to prevent linker errors.
|
||||
|
||||
choice
|
||||
prompt "Specify GCOV format"
|
||||
depends on GCOV_KERNEL
|
||||
depends on CC_IS_GCC
|
||||
---help---
|
||||
The gcov format is usually determined by the GCC version, and the
|
||||
default is chosen according to your GCC version. However, there are
|
||||
exceptions where format changes are integrated in lower-version GCCs.
|
||||
In such a case, change this option to adjust the format used in the
|
||||
kernel accordingly.
|
||||
|
||||
config GCOV_FORMAT_3_4
|
||||
bool "GCC 3.4 format"
|
||||
depends on GCC_VERSION < 40700
|
||||
---help---
|
||||
Select this option to use the format defined by GCC 3.4.
|
||||
|
||||
config GCOV_FORMAT_4_7
|
||||
bool "GCC 4.7 format"
|
||||
---help---
|
||||
Select this option to use the format defined by GCC 4.7.
|
||||
|
||||
endchoice
|
||||
|
||||
endmenu
|
||||
|
||||
@ -2,6 +2,5 @@
|
||||
ccflags-y := -DSRCTREE='"$(srctree)"' -DOBJTREE='"$(objtree)"'
|
||||
|
||||
obj-y := base.o fs.o
|
||||
obj-$(CONFIG_GCOV_FORMAT_3_4) += gcc_base.o gcc_3_4.o
|
||||
obj-$(CONFIG_GCOV_FORMAT_4_7) += gcc_base.o gcc_4_7.o
|
||||
obj-$(CONFIG_CC_IS_GCC) += gcc_base.o gcc_4_7.o
|
||||
obj-$(CONFIG_CC_IS_CLANG) += clang.o
|
||||
|
||||
@ -1,573 +0,0 @@
|
||||
// SPDX-License-Identifier: GPL-2.0
|
||||
/*
|
||||
* This code provides functions to handle gcc's profiling data format
|
||||
* introduced with gcc 3.4. Future versions of gcc may change the gcov
|
||||
* format (as happened before), so all format-specific information needs
|
||||
* to be kept modular and easily exchangeable.
|
||||
*
|
||||
* This file is based on gcc-internal definitions. Functions and data
|
||||
* structures are defined to be compatible with gcc counterparts.
|
||||
* For a better understanding, refer to gcc source: gcc/gcov-io.h.
|
||||
*
|
||||
* Copyright IBM Corp. 2009
|
||||
* Author(s): Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
|
||||
*
|
||||
* Uses gcc-internal data definitions.
|
||||
*/
|
||||
|
||||
#include <linux/errno.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/string.h>
|
||||
#include <linux/seq_file.h>
|
||||
#include <linux/vmalloc.h>
|
||||
#include "gcov.h"
|
||||
|
||||
#define GCOV_COUNTERS 5
|
||||
|
||||
static struct gcov_info *gcov_info_head;
|
||||
|
||||
/**
|
||||
* struct gcov_fn_info - profiling meta data per function
|
||||
* @ident: object file-unique function identifier
|
||||
* @checksum: function checksum
|
||||
* @n_ctrs: number of values per counter type belonging to this function
|
||||
*
|
||||
* This data is generated by gcc during compilation and doesn't change
|
||||
* at run-time.
|
||||
*/
|
||||
struct gcov_fn_info {
|
||||
unsigned int ident;
|
||||
unsigned int checksum;
|
||||
unsigned int n_ctrs[];
|
||||
};
|
||||
|
||||
/**
|
||||
* struct gcov_ctr_info - profiling data per counter type
|
||||
* @num: number of counter values for this type
|
||||
* @values: array of counter values for this type
|
||||
* @merge: merge function for counter values of this type (unused)
|
||||
*
|
||||
* This data is generated by gcc during compilation and doesn't change
|
||||
* at run-time with the exception of the values array.
|
||||
*/
|
||||
struct gcov_ctr_info {
|
||||
unsigned int num;
|
||||
gcov_type *values;
|
||||
void (*merge)(gcov_type *, unsigned int);
|
||||
};
|
||||
|
||||
/**
|
||||
* struct gcov_info - profiling data per object file
|
||||
* @version: gcov version magic indicating the gcc version used for compilation
|
||||
* @next: list head for a singly-linked list
|
||||
* @stamp: time stamp
|
||||
* @filename: name of the associated gcov data file
|
||||
* @n_functions: number of instrumented functions
|
||||
* @functions: function data
|
||||
* @ctr_mask: mask specifying which counter types are active
|
||||
* @counts: counter data per counter type
|
||||
*
|
||||
* This data is generated by gcc during compilation and doesn't change
|
||||
* at run-time with the exception of the next pointer.
|
||||
*/
|
||||
struct gcov_info {
|
||||
unsigned int version;
|
||||
struct gcov_info *next;
|
||||
unsigned int stamp;
|
||||
const char *filename;
|
||||
unsigned int n_functions;
|
||||
const struct gcov_fn_info *functions;
|
||||
unsigned int ctr_mask;
|
||||
struct gcov_ctr_info counts[];
|
||||
};
|
||||
|
||||
/**
|
||||
* gcov_info_filename - return info filename
|
||||
* @info: profiling data set
|
||||
*/
|
||||
const char *gcov_info_filename(struct gcov_info *info)
|
||||
{
|
||||
return info->filename;
|
||||
}
|
||||
|
||||
/**
|
||||
* gcov_info_version - return info version
|
||||
* @info: profiling data set
|
||||
*/
|
||||
unsigned int gcov_info_version(struct gcov_info *info)
|
||||
{
|
||||
return info->version;
|
||||
}
|
||||
|
||||
/**
|
||||
* gcov_info_next - return next profiling data set
|
||||
* @info: profiling data set
|
||||
*
|
||||
* Returns next gcov_info following @info or first gcov_info in the chain if
|
||||
* @info is %NULL.
|
||||
*/
|
||||
struct gcov_info *gcov_info_next(struct gcov_info *info)
|
||||
{
|
||||
if (!info)
|
||||
return gcov_info_head;
|
||||
|
||||
return info->next;
|
||||
}
|
||||
|
||||
/**
|
||||
* gcov_info_link - link/add profiling data set to the list
|
||||
* @info: profiling data set
|
||||
*/
|
||||
void gcov_info_link(struct gcov_info *info)
|
||||
{
|
||||
info->next = gcov_info_head;
|
||||
gcov_info_head = info;
|
||||
}
|
||||
|
||||
/**
|
||||
* gcov_info_unlink - unlink/remove profiling data set from the list
|
||||
* @prev: previous profiling data set
|
||||
* @info: profiling data set
|
||||
*/
|
||||
void gcov_info_unlink(struct gcov_info *prev, struct gcov_info *info)
|
||||
{
|
||||
if (prev)
|
||||
prev->next = info->next;
|
||||
else
|
||||
gcov_info_head = info->next;
|
||||
}
|
||||
|
||||
/**
|
||||
* gcov_info_within_module - check if a profiling data set belongs to a module
|
||||
* @info: profiling data set
|
||||
* @mod: module
|
||||
*
|
||||
* Returns true if profiling data belongs module, false otherwise.
|
||||
*/
|
||||
bool gcov_info_within_module(struct gcov_info *info, struct module *mod)
|
||||
{
|
||||
return within_module((unsigned long)info, mod);
|
||||
}
|
||||
|
||||
/* Symbolic links to be created for each profiling data file. */
|
||||
const struct gcov_link gcov_link[] = {
|
||||
{ OBJ_TREE, "gcno" }, /* Link to .gcno file in $(objtree). */
|
||||
{ 0, NULL},
|
||||
};
|
||||
|
||||
/*
|
||||
* Determine whether a counter is active. Based on gcc magic. Doesn't change
|
||||
* at run-time.
|
||||
*/
|
||||
static int counter_active(struct gcov_info *info, unsigned int type)
|
||||
{
|
||||
return (1 << type) & info->ctr_mask;
|
||||
}
|
||||
|
||||
/* Determine number of active counters. Based on gcc magic. */
|
||||
static unsigned int num_counter_active(struct gcov_info *info)
|
||||
{
|
||||
unsigned int i;
|
||||
unsigned int result = 0;
|
||||
|
||||
for (i = 0; i < GCOV_COUNTERS; i++) {
|
||||
if (counter_active(info, i))
|
||||
result++;
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
/**
|
||||
* gcov_info_reset - reset profiling data to zero
|
||||
* @info: profiling data set
|
||||
*/
|
||||
void gcov_info_reset(struct gcov_info *info)
|
||||
{
|
||||
unsigned int active = num_counter_active(info);
|
||||
unsigned int i;
|
||||
|
||||
for (i = 0; i < active; i++) {
|
||||
memset(info->counts[i].values, 0,
|
||||
info->counts[i].num * sizeof(gcov_type));
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* gcov_info_is_compatible - check if profiling data can be added
|
||||
* @info1: first profiling data set
|
||||
* @info2: second profiling data set
|
||||
*
|
||||
* Returns non-zero if profiling data can be added, zero otherwise.
|
||||
*/
|
||||
int gcov_info_is_compatible(struct gcov_info *info1, struct gcov_info *info2)
|
||||
{
|
||||
return (info1->stamp == info2->stamp);
|
||||
}
|
||||
|
||||
/**
|
||||
* gcov_info_add - add up profiling data
|
||||
* @dest: profiling data set to which data is added
|
||||
* @source: profiling data set which is added
|
||||
*
|
||||
* Adds profiling counts of @source to @dest.
|
||||
*/
|
||||
void gcov_info_add(struct gcov_info *dest, struct gcov_info *source)
|
||||
{
|
||||
unsigned int i;
|
||||
unsigned int j;
|
||||
|
||||
for (i = 0; i < num_counter_active(dest); i++) {
|
||||
for (j = 0; j < dest->counts[i].num; j++) {
|
||||
dest->counts[i].values[j] +=
|
||||
source->counts[i].values[j];
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* Get size of function info entry. Based on gcc magic. */
|
||||
static size_t get_fn_size(struct gcov_info *info)
|
||||
{
|
||||
size_t size;
|
||||
|
||||
size = sizeof(struct gcov_fn_info) + num_counter_active(info) *
|
||||
sizeof(unsigned int);
|
||||
if (__alignof__(struct gcov_fn_info) > sizeof(unsigned int))
|
||||
size = ALIGN(size, __alignof__(struct gcov_fn_info));
|
||||
return size;
|
||||
}
|
||||
|
||||
/* Get address of function info entry. Based on gcc magic. */
|
||||
static struct gcov_fn_info *get_fn_info(struct gcov_info *info, unsigned int fn)
|
||||
{
|
||||
return (struct gcov_fn_info *)
|
||||
((char *) info->functions + fn * get_fn_size(info));
|
||||
}
|
||||
|
||||
/**
|
||||
* gcov_info_dup - duplicate profiling data set
|
||||
* @info: profiling data set to duplicate
|
||||
*
|
||||
* Return newly allocated duplicate on success, %NULL on error.
|
||||
*/
|
||||
struct gcov_info *gcov_info_dup(struct gcov_info *info)
|
||||
{
|
||||
struct gcov_info *dup;
|
||||
unsigned int i;
|
||||
unsigned int active;
|
||||
|
||||
/* Duplicate gcov_info. */
|
||||
active = num_counter_active(info);
|
||||
dup = kzalloc(struct_size(dup, counts, active), GFP_KERNEL);
|
||||
if (!dup)
|
||||
return NULL;
|
||||
dup->version = info->version;
|
||||
dup->stamp = info->stamp;
|
||||
dup->n_functions = info->n_functions;
|
||||
dup->ctr_mask = info->ctr_mask;
|
||||
/* Duplicate filename. */
|
||||
dup->filename = kstrdup(info->filename, GFP_KERNEL);
|
||||
if (!dup->filename)
|
||||
goto err_free;
|
||||
/* Duplicate table of functions. */
|
||||
dup->functions = kmemdup(info->functions, info->n_functions *
|
||||
get_fn_size(info), GFP_KERNEL);
|
||||
if (!dup->functions)
|
||||
goto err_free;
|
||||
/* Duplicate counter arrays. */
|
||||
for (i = 0; i < active ; i++) {
|
||||
struct gcov_ctr_info *ctr = &info->counts[i];
|
||||
size_t size = ctr->num * sizeof(gcov_type);
|
||||
|
||||
dup->counts[i].num = ctr->num;
|
||||
dup->counts[i].merge = ctr->merge;
|
||||
dup->counts[i].values = vmalloc(size);
|
||||
if (!dup->counts[i].values)
|
||||
goto err_free;
|
||||
memcpy(dup->counts[i].values, ctr->values, size);
|
||||
}
|
||||
return dup;
|
||||
|
||||
err_free:
|
||||
gcov_info_free(dup);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/**
|
||||
* gcov_info_free - release memory for profiling data set duplicate
|
||||
* @info: profiling data set duplicate to free
|
||||
*/
|
||||
void gcov_info_free(struct gcov_info *info)
|
||||
{
|
||||
unsigned int active = num_counter_active(info);
|
||||
unsigned int i;
|
||||
|
||||
for (i = 0; i < active ; i++)
|
||||
vfree(info->counts[i].values);
|
||||
kfree(info->functions);
|
||||
kfree(info->filename);
|
||||
kfree(info);
|
||||
}
|
||||
|
||||
/**
|
||||
* struct type_info - iterator helper array
|
||||
* @ctr_type: counter type
|
||||
* @offset: index of the first value of the current function for this type
|
||||
*
|
||||
* This array is needed to convert the in-memory data format into the in-file
|
||||
* data format:
|
||||
*
|
||||
* In-memory:
|
||||
* for each counter type
|
||||
* for each function
|
||||
* values
|
||||
*
|
||||
* In-file:
|
||||
* for each function
|
||||
* for each counter type
|
||||
* values
|
||||
*
|
||||
* See gcc source gcc/gcov-io.h for more information on data organization.
|
||||
*/
|
||||
struct type_info {
|
||||
int ctr_type;
|
||||
unsigned int offset;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct gcov_iterator - specifies current file position in logical records
|
||||
* @info: associated profiling data
|
||||
* @record: record type
|
||||
* @function: function number
|
||||
* @type: counter type
|
||||
* @count: index into values array
|
||||
* @num_types: number of counter types
|
||||
* @type_info: helper array to get values-array offset for current function
|
||||
*/
|
||||
struct gcov_iterator {
|
||||
struct gcov_info *info;
|
||||
|
||||
int record;
|
||||
unsigned int function;
|
||||
unsigned int type;
|
||||
unsigned int count;
|
||||
|
||||
int num_types;
|
||||
struct type_info type_info[];
|
||||
};
|
||||
|
||||
static struct gcov_fn_info *get_func(struct gcov_iterator *iter)
|
||||
{
|
||||
return get_fn_info(iter->info, iter->function);
|
||||
}
|
||||
|
||||
static struct type_info *get_type(struct gcov_iterator *iter)
|
||||
{
|
||||
return &iter->type_info[iter->type];
|
||||
}
|
||||
|
||||
/**
|
||||
* gcov_iter_new - allocate and initialize profiling data iterator
|
||||
* @info: profiling data set to be iterated
|
||||
*
|
||||
* Return file iterator on success, %NULL otherwise.
|
||||
*/
|
||||
struct gcov_iterator *gcov_iter_new(struct gcov_info *info)
|
||||
{
|
||||
struct gcov_iterator *iter;
|
||||
|
||||
iter = kzalloc(struct_size(iter, type_info, num_counter_active(info)),
|
||||
GFP_KERNEL);
|
||||
if (iter)
|
||||
iter->info = info;
|
||||
|
||||
return iter;
|
||||
}
|
||||
|
||||
/**
|
||||
* gcov_iter_free - release memory for iterator
|
||||
* @iter: file iterator to free
|
||||
*/
|
||||
void gcov_iter_free(struct gcov_iterator *iter)
|
||||
{
|
||||
kfree(iter);
|
||||
}
|
||||
|
||||
/**
|
||||
* gcov_iter_get_info - return profiling data set for given file iterator
|
||||
* @iter: file iterator
|
||||
*/
|
||||
struct gcov_info *gcov_iter_get_info(struct gcov_iterator *iter)
|
||||
{
|
||||
return iter->info;
|
||||
}
|
||||
|
||||
/**
|
||||
* gcov_iter_start - reset file iterator to starting position
|
||||
* @iter: file iterator
|
||||
*/
|
||||
void gcov_iter_start(struct gcov_iterator *iter)
|
||||
{
|
||||
int i;
|
||||
|
||||
iter->record = 0;
|
||||
iter->function = 0;
|
||||
iter->type = 0;
|
||||
iter->count = 0;
|
||||
iter->num_types = 0;
|
||||
for (i = 0; i < GCOV_COUNTERS; i++) {
|
||||
if (counter_active(iter->info, i)) {
|
||||
iter->type_info[iter->num_types].ctr_type = i;
|
||||
iter->type_info[iter->num_types++].offset = 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* Mapping of logical record number to actual file content. */
|
||||
#define RECORD_FILE_MAGIC 0
|
||||
#define RECORD_GCOV_VERSION 1
|
||||
#define RECORD_TIME_STAMP 2
|
||||
#define RECORD_FUNCTION_TAG 3
|
||||
#define RECORD_FUNCTON_TAG_LEN 4
|
||||
#define RECORD_FUNCTION_IDENT 5
|
||||
#define RECORD_FUNCTION_CHECK 6
|
||||
#define RECORD_COUNT_TAG 7
|
||||
#define RECORD_COUNT_LEN 8
|
||||
#define RECORD_COUNT 9
|
||||
|
||||
/**
|
||||
* gcov_iter_next - advance file iterator to next logical record
|
||||
* @iter: file iterator
|
||||
*
|
||||
* Return zero if new position is valid, non-zero if iterator has reached end.
|
||||
*/
|
||||
int gcov_iter_next(struct gcov_iterator *iter)
|
||||
{
|
||||
switch (iter->record) {
|
||||
case RECORD_FILE_MAGIC:
|
||||
case RECORD_GCOV_VERSION:
|
||||
case RECORD_FUNCTION_TAG:
|
||||
case RECORD_FUNCTON_TAG_LEN:
|
||||
case RECORD_FUNCTION_IDENT:
|
||||
case RECORD_COUNT_TAG:
|
||||
/* Advance to next record */
|
||||
iter->record++;
|
||||
break;
|
||||
case RECORD_COUNT:
|
||||
/* Advance to next count */
|
||||
iter->count++;
|
||||
/* fall through */
|
||||
case RECORD_COUNT_LEN:
|
||||
if (iter->count < get_func(iter)->n_ctrs[iter->type]) {
|
||||
iter->record = 9;
|
||||
break;
|
||||
}
|
||||
/* Advance to next counter type */
|
||||
get_type(iter)->offset += iter->count;
|
||||
iter->count = 0;
|
||||
iter->type++;
|
||||
/* fall through */
|
||||
case RECORD_FUNCTION_CHECK:
|
||||
if (iter->type < iter->num_types) {
|
||||
iter->record = 7;
|
||||
break;
|
||||
}
|
||||
/* Advance to next function */
|
||||
iter->type = 0;
|
||||
iter->function++;
|
||||
/* fall through */
|
||||
case RECORD_TIME_STAMP:
|
||||
if (iter->function < iter->info->n_functions)
|
||||
iter->record = 3;
|
||||
else
|
||||
iter->record = -1;
|
||||
break;
|
||||
}
|
||||
/* Check for EOF. */
|
||||
if (iter->record == -1)
|
||||
return -EINVAL;
|
||||
else
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* seq_write_gcov_u32 - write 32 bit number in gcov format to seq_file
|
||||
* @seq: seq_file handle
|
||||
* @v: value to be stored
|
||||
*
|
||||
* Number format defined by gcc: numbers are recorded in the 32 bit
|
||||
* unsigned binary form of the endianness of the machine generating the
|
||||
* file.
|
||||
*/
|
||||
static int seq_write_gcov_u32(struct seq_file *seq, u32 v)
|
||||
{
|
||||
return seq_write(seq, &v, sizeof(v));
|
||||
}
|
||||
|
||||
/**
|
||||
* seq_write_gcov_u64 - write 64 bit number in gcov format to seq_file
|
||||
* @seq: seq_file handle
|
||||
* @v: value to be stored
|
||||
*
|
||||
* Number format defined by gcc: numbers are recorded in the 32 bit
|
||||
* unsigned binary form of the endianness of the machine generating the
|
||||
* file. 64 bit numbers are stored as two 32 bit numbers, the low part
|
||||
* first.
|
||||
*/
|
||||
static int seq_write_gcov_u64(struct seq_file *seq, u64 v)
|
||||
{
|
||||
u32 data[2];
|
||||
|
||||
data[0] = (v & 0xffffffffUL);
|
||||
data[1] = (v >> 32);
|
||||
return seq_write(seq, data, sizeof(data));
|
||||
}
|
||||
|
||||
/**
|
||||
* gcov_iter_write - write data for current pos to seq_file
|
||||
* @iter: file iterator
|
||||
* @seq: seq_file handle
|
||||
*
|
||||
* Return zero on success, non-zero otherwise.
|
||||
*/
|
||||
int gcov_iter_write(struct gcov_iterator *iter, struct seq_file *seq)
|
||||
{
|
||||
int rc = -EINVAL;
|
||||
|
||||
switch (iter->record) {
|
||||
case RECORD_FILE_MAGIC:
|
||||
rc = seq_write_gcov_u32(seq, GCOV_DATA_MAGIC);
|
||||
break;
|
||||
case RECORD_GCOV_VERSION:
|
||||
rc = seq_write_gcov_u32(seq, iter->info->version);
|
||||
break;
|
||||
case RECORD_TIME_STAMP:
|
||||
rc = seq_write_gcov_u32(seq, iter->info->stamp);
|
||||
break;
|
||||
case RECORD_FUNCTION_TAG:
|
||||
rc = seq_write_gcov_u32(seq, GCOV_TAG_FUNCTION);
|
||||
break;
|
||||
case RECORD_FUNCTON_TAG_LEN:
|
||||
rc = seq_write_gcov_u32(seq, 2);
|
||||
break;
|
||||
case RECORD_FUNCTION_IDENT:
|
||||
rc = seq_write_gcov_u32(seq, get_func(iter)->ident);
|
||||
break;
|
||||
case RECORD_FUNCTION_CHECK:
|
||||
rc = seq_write_gcov_u32(seq, get_func(iter)->checksum);
|
||||
break;
|
||||
case RECORD_COUNT_TAG:
|
||||
rc = seq_write_gcov_u32(seq,
|
||||
GCOV_TAG_FOR_COUNTER(get_type(iter)->ctr_type));
|
||||
break;
|
||||
case RECORD_COUNT_LEN:
|
||||
rc = seq_write_gcov_u32(seq,
|
||||
get_func(iter)->n_ctrs[iter->type] * 2);
|
||||
break;
|
||||
case RECORD_COUNT:
|
||||
rc = seq_write_gcov_u64(seq,
|
||||
iter->info->counts[iter->type].
|
||||
values[iter->count + get_type(iter)->offset]);
|
||||
break;
|
||||
}
|
||||
return rc;
|
||||
}
|
||||
@ -106,7 +106,9 @@ bool should_fail(struct fault_attr *attr, ssize_t size)
|
||||
unsigned int fail_nth = READ_ONCE(current->fail_nth);
|
||||
|
||||
if (fail_nth) {
|
||||
if (!WRITE_ONCE(current->fail_nth, fail_nth - 1))
|
||||
fail_nth--;
|
||||
WRITE_ONCE(current->fail_nth, fail_nth);
|
||||
if (!fail_nth)
|
||||
goto fail;
|
||||
|
||||
return false;
|
||||
|
||||
@ -376,7 +376,7 @@ static bool nf_remove_net_hook(struct nf_hook_entries *old,
|
||||
if (orig_ops[i] != unreg)
|
||||
continue;
|
||||
WRITE_ONCE(old->hooks[i].hook, accept_all);
|
||||
WRITE_ONCE(orig_ops[i], &dummy_ops);
|
||||
WRITE_ONCE(orig_ops[i], (void *)&dummy_ops);
|
||||
return true;
|
||||
}
|
||||
|
||||
|
||||
@ -629,7 +629,7 @@ struct tls_context *tls_ctx_create(struct sock *sk)
|
||||
static void tls_build_proto(struct sock *sk)
|
||||
{
|
||||
int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
|
||||
const struct proto *prot = READ_ONCE(sk->sk_prot);
|
||||
struct proto *prot = READ_ONCE(sk->sk_prot);
|
||||
|
||||
/* Build IPv6 TLS whenever the address of tcpv6 _prot changes */
|
||||
if (ip_ver == TLSV6 &&
|
||||
|
||||
@ -8,7 +8,7 @@ config HAVE_GCC_PLUGINS
|
||||
menuconfig GCC_PLUGINS
|
||||
bool "GCC plugins"
|
||||
depends on HAVE_GCC_PLUGINS
|
||||
depends on CC_IS_GCC && GCC_VERSION >= 40800
|
||||
depends on CC_IS_GCC
|
||||
depends on $(success,$(srctree)/scripts/gcc-plugin.sh $(CC))
|
||||
default y
|
||||
help
|
||||
|
||||
Loading…
Reference in New Issue
Block a user