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asm-generic/atomic: Add try_cmpxchg() fallbacks

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Only x86 provides try_cmpxchg() outside of the atomic_t interfaces,
provide generic fallbacks to create this interface from the widely
available cmpxchg() function.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/159870621515.1229682.15506193091065001742.stgit@devnote2
This commit is contained in:
Peter Zijlstra 2020-08-29 22:03:35 +09:00 committed by Ingo Molnar
parent d741bf41d7
commit 29f006fdef
8 changed files with 372 additions and 122 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/include/asm/atomic.h
View File

@ -199,7 +199,7 @@ static __always_inline int arch_atomic_cmpxchg(atomic_t *v, int old, int new)
static __always_inline bool arch_atomic_try_cmpxchg(atomic_t *v, int *old, int new)
{
return try_cmpxchg(&v->counter, old, new);
return arch_try_cmpxchg(&v->counter, old, new);
}
#define arch_atomic_try_cmpxchg arch_atomic_try_cmpxchg

2
arch/x86/include/asm/atomic64_64.h
View File

@ -187,7 +187,7 @@ static inline s64 arch_atomic64_cmpxchg(atomic64_t *v, s64 old, s64 new)
static __always_inline bool arch_atomic64_try_cmpxchg(atomic64_t *v, s64 *old, s64 new)
{
return try_cmpxchg(&v->counter, old, new);
return arch_try_cmpxchg(&v->counter, old, new);
}
#define arch_atomic64_try_cmpxchg arch_atomic64_try_cmpxchg

2
arch/x86/include/asm/cmpxchg.h
View File

@ -221,7 +221,7 @@ extern void __add_wrong_size(void)
#define __try_cmpxchg(ptr, pold, new, size) \
__raw_try_cmpxchg((ptr), (pold), (new), (size), LOCK_PREFIX)
#define try_cmpxchg(ptr, pold, new) \
#define arch_try_cmpxchg(ptr, pold, new) \
__try_cmpxchg((ptr), (pold), (new), sizeof(*(ptr)))
/*

216
include/asm-generic/atomic-instrumented.h
View File

@ -1642,148 +1642,192 @@ atomic64_dec_if_positive(atomic64_t *v)
#endif
#if !defined(arch_xchg_relaxed) || defined(arch_xchg)
#define xchg(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
arch_xchg(__ai_ptr, __VA_ARGS__); \
#define xchg(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
arch_xchg(__ai_ptr, __VA_ARGS__); \
})
#endif
#if defined(arch_xchg_acquire)
#define xchg_acquire(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
arch_xchg_acquire(__ai_ptr, __VA_ARGS__); \
#define xchg_acquire(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
arch_xchg_acquire(__ai_ptr, __VA_ARGS__); \
})
#endif
#if defined(arch_xchg_release)
#define xchg_release(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
arch_xchg_release(__ai_ptr, __VA_ARGS__); \
#define xchg_release(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
arch_xchg_release(__ai_ptr, __VA_ARGS__); \
})
#endif
#if defined(arch_xchg_relaxed)
#define xchg_relaxed(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
arch_xchg_relaxed(__ai_ptr, __VA_ARGS__); \
#define xchg_relaxed(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
arch_xchg_relaxed(__ai_ptr, __VA_ARGS__); \
})
#endif
#if !defined(arch_cmpxchg_relaxed) || defined(arch_cmpxchg)
#define cmpxchg(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
arch_cmpxchg(__ai_ptr, __VA_ARGS__); \
#define cmpxchg(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
arch_cmpxchg(__ai_ptr, __VA_ARGS__); \
})
#endif
#if defined(arch_cmpxchg_acquire)
#define cmpxchg_acquire(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
arch_cmpxchg_acquire(__ai_ptr, __VA_ARGS__); \
#define cmpxchg_acquire(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
arch_cmpxchg_acquire(__ai_ptr, __VA_ARGS__); \
})
#endif
#if defined(arch_cmpxchg_release)
#define cmpxchg_release(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
arch_cmpxchg_release(__ai_ptr, __VA_ARGS__); \
#define cmpxchg_release(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
arch_cmpxchg_release(__ai_ptr, __VA_ARGS__); \
})
#endif
#if defined(arch_cmpxchg_relaxed)
#define cmpxchg_relaxed(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
arch_cmpxchg_relaxed(__ai_ptr, __VA_ARGS__); \
#define cmpxchg_relaxed(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
arch_cmpxchg_relaxed(__ai_ptr, __VA_ARGS__); \
})
#endif
#if !defined(arch_cmpxchg64_relaxed) || defined(arch_cmpxchg64)
#define cmpxchg64(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
arch_cmpxchg64(__ai_ptr, __VA_ARGS__); \
#define cmpxchg64(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
arch_cmpxchg64(__ai_ptr, __VA_ARGS__); \
})
#endif
#if defined(arch_cmpxchg64_acquire)
#define cmpxchg64_acquire(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
arch_cmpxchg64_acquire(__ai_ptr, __VA_ARGS__); \
#define cmpxchg64_acquire(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
arch_cmpxchg64_acquire(__ai_ptr, __VA_ARGS__); \
})
#endif
#if defined(arch_cmpxchg64_release)
#define cmpxchg64_release(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
arch_cmpxchg64_release(__ai_ptr, __VA_ARGS__); \
#define cmpxchg64_release(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
arch_cmpxchg64_release(__ai_ptr, __VA_ARGS__); \
})
#endif
#if defined(arch_cmpxchg64_relaxed)
#define cmpxchg64_relaxed(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
arch_cmpxchg64_relaxed(__ai_ptr, __VA_ARGS__); \
#define cmpxchg64_relaxed(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
arch_cmpxchg64_relaxed(__ai_ptr, __VA_ARGS__); \
})
#endif
#define cmpxchg_local(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
arch_cmpxchg_local(__ai_ptr, __VA_ARGS__); \
#if !defined(arch_try_cmpxchg_relaxed) || defined(arch_try_cmpxchg)
#define try_cmpxchg(ptr, oldp, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
typeof(oldp) __ai_oldp = (oldp); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
instrument_atomic_write(__ai_oldp, sizeof(*__ai_oldp)); \
arch_try_cmpxchg(__ai_ptr, __ai_oldp, __VA_ARGS__); \
})
#endif
#if defined(arch_try_cmpxchg_acquire)
#define try_cmpxchg_acquire(ptr, oldp, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
typeof(oldp) __ai_oldp = (oldp); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
instrument_atomic_write(__ai_oldp, sizeof(*__ai_oldp)); \
arch_try_cmpxchg_acquire(__ai_ptr, __ai_oldp, __VA_ARGS__); \
})
#endif
#if defined(arch_try_cmpxchg_release)
#define try_cmpxchg_release(ptr, oldp, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
typeof(oldp) __ai_oldp = (oldp); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
instrument_atomic_write(__ai_oldp, sizeof(*__ai_oldp)); \
arch_try_cmpxchg_release(__ai_ptr, __ai_oldp, __VA_ARGS__); \
})
#endif
#if defined(arch_try_cmpxchg_relaxed)
#define try_cmpxchg_relaxed(ptr, oldp, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
typeof(oldp) __ai_oldp = (oldp); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
instrument_atomic_write(__ai_oldp, sizeof(*__ai_oldp)); \
arch_try_cmpxchg_relaxed(__ai_ptr, __ai_oldp, __VA_ARGS__); \
})
#endif
#define cmpxchg_local(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
arch_cmpxchg_local(__ai_ptr, __VA_ARGS__); \
})
#define cmpxchg64_local(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
arch_cmpxchg64_local(__ai_ptr, __VA_ARGS__); \
#define cmpxchg64_local(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
arch_cmpxchg64_local(__ai_ptr, __VA_ARGS__); \
})
#define sync_cmpxchg(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
arch_sync_cmpxchg(__ai_ptr, __VA_ARGS__); \
#define sync_cmpxchg(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
arch_sync_cmpxchg(__ai_ptr, __VA_ARGS__); \
})
#define cmpxchg_double(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, 2 * sizeof(*__ai_ptr)); \
arch_cmpxchg_double(__ai_ptr, __VA_ARGS__); \
#define cmpxchg_double(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, 2 * sizeof(*__ai_ptr)); \
arch_cmpxchg_double(__ai_ptr, __VA_ARGS__); \
})
#define cmpxchg_double_local(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, 2 * sizeof(*__ai_ptr)); \
arch_cmpxchg_double_local(__ai_ptr, __VA_ARGS__); \
#define cmpxchg_double_local(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
instrument_atomic_write(__ai_ptr, 2 * sizeof(*__ai_ptr)); \
arch_cmpxchg_double_local(__ai_ptr, __VA_ARGS__); \
})
#endif /* _ASM_GENERIC_ATOMIC_INSTRUMENTED_H */
// 89bf97f3a7509b740845e51ddf31055b48a81f40
// ff0fe7f81ee97f01f13bb78b0e3ce800bc56d9dd

90
include/linux/atomic-arch-fallback.h
View File

@ -9,9 +9,9 @@
#include <linux/compiler.h>
#ifndef arch_xchg_relaxed
#define arch_xchg_relaxed arch_xchg
#define arch_xchg_acquire arch_xchg
#define arch_xchg_release arch_xchg
#define arch_xchg_acquire arch_xchg
#define arch_xchg_release arch_xchg
#define arch_xchg_relaxed arch_xchg
#else /* arch_xchg_relaxed */
#ifndef arch_xchg_acquire
@ -32,9 +32,9 @@
#endif /* arch_xchg_relaxed */
#ifndef arch_cmpxchg_relaxed
#define arch_cmpxchg_relaxed arch_cmpxchg
#define arch_cmpxchg_acquire arch_cmpxchg
#define arch_cmpxchg_release arch_cmpxchg
#define arch_cmpxchg_acquire arch_cmpxchg
#define arch_cmpxchg_release arch_cmpxchg
#define arch_cmpxchg_relaxed arch_cmpxchg
#else /* arch_cmpxchg_relaxed */
#ifndef arch_cmpxchg_acquire
@ -55,9 +55,9 @@
#endif /* arch_cmpxchg_relaxed */
#ifndef arch_cmpxchg64_relaxed
#define arch_cmpxchg64_relaxed arch_cmpxchg64
#define arch_cmpxchg64_acquire arch_cmpxchg64
#define arch_cmpxchg64_release arch_cmpxchg64
#define arch_cmpxchg64_acquire arch_cmpxchg64
#define arch_cmpxchg64_release arch_cmpxchg64
#define arch_cmpxchg64_relaxed arch_cmpxchg64
#else /* arch_cmpxchg64_relaxed */
#ifndef arch_cmpxchg64_acquire
@ -77,6 +77,76 @@
#endif /* arch_cmpxchg64_relaxed */
#ifndef arch_try_cmpxchg_relaxed
#ifdef arch_try_cmpxchg
#define arch_try_cmpxchg_acquire arch_try_cmpxchg
#define arch_try_cmpxchg_release arch_try_cmpxchg
#define arch_try_cmpxchg_relaxed arch_try_cmpxchg
#endif /* arch_try_cmpxchg */
#ifndef arch_try_cmpxchg
#define arch_try_cmpxchg(_ptr, _oldp, _new) \
({ \
typeof(*(_ptr)) *___op = (_oldp), ___o = *___op, ___r; \
___r = arch_cmpxchg((_ptr), ___o, (_new)); \
if (unlikely(___r != ___o)) \
*___op = ___r; \
likely(___r == ___o); \
})
#endif /* arch_try_cmpxchg */
#ifndef arch_try_cmpxchg_acquire
#define arch_try_cmpxchg_acquire(_ptr, _oldp, _new) \
({ \
typeof(*(_ptr)) *___op = (_oldp), ___o = *___op, ___r; \
___r = arch_cmpxchg_acquire((_ptr), ___o, (_new)); \
if (unlikely(___r != ___o)) \
*___op = ___r; \
likely(___r == ___o); \
})
#endif /* arch_try_cmpxchg_acquire */
#ifndef arch_try_cmpxchg_release
#define arch_try_cmpxchg_release(_ptr, _oldp, _new) \
({ \
typeof(*(_ptr)) *___op = (_oldp), ___o = *___op, ___r; \
___r = arch_cmpxchg_release((_ptr), ___o, (_new)); \
if (unlikely(___r != ___o)) \
*___op = ___r; \
likely(___r == ___o); \
})
#endif /* arch_try_cmpxchg_release */
#ifndef arch_try_cmpxchg_relaxed
#define arch_try_cmpxchg_relaxed(_ptr, _oldp, _new) \
({ \
typeof(*(_ptr)) *___op = (_oldp), ___o = *___op, ___r; \
___r = arch_cmpxchg_relaxed((_ptr), ___o, (_new)); \
if (unlikely(___r != ___o)) \
*___op = ___r; \
likely(___r == ___o); \
})
#endif /* arch_try_cmpxchg_relaxed */
#else /* arch_try_cmpxchg_relaxed */
#ifndef arch_try_cmpxchg_acquire
#define arch_try_cmpxchg_acquire(...) \
__atomic_op_acquire(arch_try_cmpxchg, __VA_ARGS__)
#endif
#ifndef arch_try_cmpxchg_release
#define arch_try_cmpxchg_release(...) \
__atomic_op_release(arch_try_cmpxchg, __VA_ARGS__)
#endif
#ifndef arch_try_cmpxchg
#define arch_try_cmpxchg(...) \
__atomic_op_fence(arch_try_cmpxchg, __VA_ARGS__)
#endif
#endif /* arch_try_cmpxchg_relaxed */
#ifndef arch_atomic_read_acquire
static __always_inline int
arch_atomic_read_acquire(const atomic_t *v)
@ -2288,4 +2358,4 @@ arch_atomic64_dec_if_positive(atomic64_t *v)
#endif
#endif /* _LINUX_ATOMIC_FALLBACK_H */
// 90cd26cfd69d2250303d654955a0cc12620fb91b
// cca554917d7ea73d5e3e7397dd70c484cad9b2c4

90
include/linux/atomic-fallback.h
View File

@ -9,9 +9,9 @@
#include <linux/compiler.h>
#ifndef xchg_relaxed
#define xchg_relaxed xchg
#define xchg_acquire xchg
#define xchg_release xchg
#define xchg_acquire xchg
#define xchg_release xchg
#define xchg_relaxed xchg
#else /* xchg_relaxed */
#ifndef xchg_acquire
@ -32,9 +32,9 @@
#endif /* xchg_relaxed */
#ifndef cmpxchg_relaxed
#define cmpxchg_relaxed cmpxchg
#define cmpxchg_acquire cmpxchg
#define cmpxchg_release cmpxchg
#define cmpxchg_acquire cmpxchg
#define cmpxchg_release cmpxchg
#define cmpxchg_relaxed cmpxchg
#else /* cmpxchg_relaxed */
#ifndef cmpxchg_acquire
@ -55,9 +55,9 @@
#endif /* cmpxchg_relaxed */
#ifndef cmpxchg64_relaxed
#define cmpxchg64_relaxed cmpxchg64
#define cmpxchg64_acquire cmpxchg64
#define cmpxchg64_release cmpxchg64
#define cmpxchg64_acquire cmpxchg64
#define cmpxchg64_release cmpxchg64
#define cmpxchg64_relaxed cmpxchg64
#else /* cmpxchg64_relaxed */
#ifndef cmpxchg64_acquire
@ -77,6 +77,76 @@
#endif /* cmpxchg64_relaxed */
#ifndef try_cmpxchg_relaxed
#ifdef try_cmpxchg
#define try_cmpxchg_acquire try_cmpxchg
#define try_cmpxchg_release try_cmpxchg
#define try_cmpxchg_relaxed try_cmpxchg
#endif /* try_cmpxchg */
#ifndef try_cmpxchg
#define try_cmpxchg(_ptr, _oldp, _new) \
({ \
typeof(*(_ptr)) *___op = (_oldp), ___o = *___op, ___r; \
___r = cmpxchg((_ptr), ___o, (_new)); \
if (unlikely(___r != ___o)) \
*___op = ___r; \
likely(___r == ___o); \
})
#endif /* try_cmpxchg */
#ifndef try_cmpxchg_acquire
#define try_cmpxchg_acquire(_ptr, _oldp, _new) \
({ \
typeof(*(_ptr)) *___op = (_oldp), ___o = *___op, ___r; \
___r = cmpxchg_acquire((_ptr), ___o, (_new)); \
if (unlikely(___r != ___o)) \
*___op = ___r; \
likely(___r == ___o); \
})
#endif /* try_cmpxchg_acquire */
#ifndef try_cmpxchg_release
#define try_cmpxchg_release(_ptr, _oldp, _new) \
({ \
typeof(*(_ptr)) *___op = (_oldp), ___o = *___op, ___r; \
___r = cmpxchg_release((_ptr), ___o, (_new)); \
if (unlikely(___r != ___o)) \
*___op = ___r; \
likely(___r == ___o); \
})
#endif /* try_cmpxchg_release */
#ifndef try_cmpxchg_relaxed
#define try_cmpxchg_relaxed(_ptr, _oldp, _new) \
({ \
typeof(*(_ptr)) *___op = (_oldp), ___o = *___op, ___r; \
___r = cmpxchg_relaxed((_ptr), ___o, (_new)); \
if (unlikely(___r != ___o)) \
*___op = ___r; \
likely(___r == ___o); \
})
#endif /* try_cmpxchg_relaxed */
#else /* try_cmpxchg_relaxed */
#ifndef try_cmpxchg_acquire
#define try_cmpxchg_acquire(...) \
__atomic_op_acquire(try_cmpxchg, __VA_ARGS__)
#endif
#ifndef try_cmpxchg_release
#define try_cmpxchg_release(...) \
__atomic_op_release(try_cmpxchg, __VA_ARGS__)
#endif
#ifndef try_cmpxchg
#define try_cmpxchg(...) \
__atomic_op_fence(try_cmpxchg, __VA_ARGS__)
#endif
#endif /* try_cmpxchg_relaxed */
#define arch_atomic_read atomic_read
#define arch_atomic_read_acquire atomic_read_acquire
@ -2522,4 +2592,4 @@ atomic64_dec_if_positive(atomic64_t *v)
#endif
#endif /* _LINUX_ATOMIC_FALLBACK_H */
// 9d95b56f98d82a2a26c7b79ccdd0c47572d50a6f
// d78e6c293c661c15188f0ec05bce45188c8d5892

63
scripts/atomic/gen-atomic-fallback.sh
View File

@ -144,15 +144,11 @@ gen_proto_order_variants()
printf "#endif /* ${basename}_relaxed */\n\n"
}
gen_xchg_fallbacks()
gen_order_fallbacks()
{
local xchg="$1"; shift
cat <<EOF
#ifndef ${xchg}_relaxed
#define ${xchg}_relaxed ${xchg}
#define ${xchg}_acquire ${xchg}
#define ${xchg}_release ${xchg}
#else /* ${xchg}_relaxed */
#ifndef ${xchg}_acquire
#define ${xchg}_acquire(...) \\
@ -169,11 +165,62 @@ cat <<EOF
__atomic_op_fence(${xchg}, __VA_ARGS__)
#endif
#endif /* ${xchg}_relaxed */
EOF
}
gen_xchg_fallbacks()
{
local xchg="$1"; shift
printf "#ifndef ${xchg}_relaxed\n"
gen_basic_fallbacks ${xchg}
printf "#else /* ${xchg}_relaxed */\n"
gen_order_fallbacks ${xchg}
printf "#endif /* ${xchg}_relaxed */\n\n"
}
gen_try_cmpxchg_fallback()
{
local order="$1"; shift;
cat <<EOF
#ifndef ${ARCH}try_cmpxchg${order}
#define ${ARCH}try_cmpxchg${order}(_ptr, _oldp, _new) \\
({ \\
typeof(*(_ptr)) *___op = (_oldp), ___o = *___op, ___r; \\
___r = ${ARCH}cmpxchg${order}((_ptr), ___o, (_new)); \\
if (unlikely(___r != ___o)) \\
*___op = ___r; \\
likely(___r == ___o); \\
})
#endif /* ${ARCH}try_cmpxchg${order} */
EOF
}
gen_try_cmpxchg_fallbacks()
{
printf "#ifndef ${ARCH}try_cmpxchg_relaxed\n"
printf "#ifdef ${ARCH}try_cmpxchg\n"
gen_basic_fallbacks "${ARCH}try_cmpxchg"
printf "#endif /* ${ARCH}try_cmpxchg */\n\n"
for order in "" "_acquire" "_release" "_relaxed"; do
gen_try_cmpxchg_fallback "${order}"
done
printf "#else /* ${ARCH}try_cmpxchg_relaxed */\n"
gen_order_fallbacks "${ARCH}try_cmpxchg"
printf "#endif /* ${ARCH}try_cmpxchg_relaxed */\n\n"
}
cat << EOF
// SPDX-License-Identifier: GPL-2.0
@ -191,6 +238,8 @@ for xchg in "${ARCH}xchg" "${ARCH}cmpxchg" "${ARCH}cmpxchg64"; do
gen_xchg_fallbacks "${xchg}"
done
gen_try_cmpxchg_fallbacks
grep '^[a-z]' "$1" | while read name meta args; do
gen_proto "${meta}" "${name}" "${ARCH}" "atomic" "int" ${args}
done

29
scripts/atomic/gen-atomic-instrumented.sh
View File

@ -103,14 +103,31 @@ gen_xchg()
local xchg="$1"; shift
local mult="$1"; shift
if [ "${xchg%${xchg#try_cmpxchg}}" = "try_cmpxchg" ] ; then
cat <<EOF
#define ${xchg}(ptr, ...) \\
({ \\
typeof(ptr) __ai_ptr = (ptr); \\
instrument_atomic_write(__ai_ptr, ${mult}sizeof(*__ai_ptr)); \\
arch_${xchg}(__ai_ptr, __VA_ARGS__); \\
#define ${xchg}(ptr, oldp, ...) \\
({ \\
typeof(ptr) __ai_ptr = (ptr); \\
typeof(oldp) __ai_oldp = (oldp); \\
instrument_atomic_write(__ai_ptr, ${mult}sizeof(*__ai_ptr)); \\
instrument_atomic_write(__ai_oldp, ${mult}sizeof(*__ai_oldp)); \\
arch_${xchg}(__ai_ptr, __ai_oldp, __VA_ARGS__); \\
})
EOF
else
cat <<EOF
#define ${xchg}(ptr, ...) \\
({ \\
typeof(ptr) __ai_ptr = (ptr); \\
instrument_atomic_write(__ai_ptr, ${mult}sizeof(*__ai_ptr)); \\
arch_${xchg}(__ai_ptr, __VA_ARGS__); \\
})
EOF
fi
}
gen_optional_xchg()
@ -160,7 +177,7 @@ grep '^[a-z]' "$1" | while read name meta args; do
gen_proto "${meta}" "${name}" "atomic64" "s64" ${args}
done
for xchg in "xchg" "cmpxchg" "cmpxchg64"; do
for xchg in "xchg" "cmpxchg" "cmpxchg64" "try_cmpxchg"; do
for order in "" "_acquire" "_release" "_relaxed"; do
gen_optional_xchg "${xchg}" "${order}"
done