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locking/atomic: Add generic try_cmpxchg64 support
Add generic support for try_cmpxchg64{,_acquire,_release,_relaxed}
and their falbacks involving cmpxchg64.
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20220515184205.103089-2-ubizjak@gmail.com
This commit is contained in:
Uros Bizjak
Peter Zijlstra
parent
6829061315
commit
0aa7be05d8
@ -147,6 +147,76 @@
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#endif /* arch_try_cmpxchg_relaxed */
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#ifndef arch_try_cmpxchg64_relaxed
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#ifdef arch_try_cmpxchg64
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#define arch_try_cmpxchg64_acquire arch_try_cmpxchg64
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#define arch_try_cmpxchg64_release arch_try_cmpxchg64
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#define arch_try_cmpxchg64_relaxed arch_try_cmpxchg64
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#endif /* arch_try_cmpxchg64 */
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#ifndef arch_try_cmpxchg64
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#define arch_try_cmpxchg64(_ptr, _oldp, _new) \
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({ \
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typeof(*(_ptr)) *___op = (_oldp), ___o = *___op, ___r; \
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___r = arch_cmpxchg64((_ptr), ___o, (_new)); \
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if (unlikely(___r != ___o)) \
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*___op = ___r; \
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likely(___r == ___o); \
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})
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#endif /* arch_try_cmpxchg64 */
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#ifndef arch_try_cmpxchg64_acquire
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#define arch_try_cmpxchg64_acquire(_ptr, _oldp, _new) \
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({ \
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typeof(*(_ptr)) *___op = (_oldp), ___o = *___op, ___r; \
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___r = arch_cmpxchg64_acquire((_ptr), ___o, (_new)); \
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if (unlikely(___r != ___o)) \
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*___op = ___r; \
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likely(___r == ___o); \
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})
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#endif /* arch_try_cmpxchg64_acquire */
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#ifndef arch_try_cmpxchg64_release
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#define arch_try_cmpxchg64_release(_ptr, _oldp, _new) \
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({ \
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typeof(*(_ptr)) *___op = (_oldp), ___o = *___op, ___r; \
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___r = arch_cmpxchg64_release((_ptr), ___o, (_new)); \
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if (unlikely(___r != ___o)) \
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*___op = ___r; \
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likely(___r == ___o); \
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})
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#endif /* arch_try_cmpxchg64_release */
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#ifndef arch_try_cmpxchg64_relaxed
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#define arch_try_cmpxchg64_relaxed(_ptr, _oldp, _new) \
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({ \
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typeof(*(_ptr)) *___op = (_oldp), ___o = *___op, ___r; \
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___r = arch_cmpxchg64_relaxed((_ptr), ___o, (_new)); \
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if (unlikely(___r != ___o)) \
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*___op = ___r; \
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likely(___r == ___o); \
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})
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#endif /* arch_try_cmpxchg64_relaxed */
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#else /* arch_try_cmpxchg64_relaxed */
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#ifndef arch_try_cmpxchg64_acquire
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#define arch_try_cmpxchg64_acquire(...) \
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__atomic_op_acquire(arch_try_cmpxchg64, __VA_ARGS__)
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#endif
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#ifndef arch_try_cmpxchg64_release
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#define arch_try_cmpxchg64_release(...) \
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__atomic_op_release(arch_try_cmpxchg64, __VA_ARGS__)
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#endif
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#ifndef arch_try_cmpxchg64
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#define arch_try_cmpxchg64(...) \
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__atomic_op_fence(arch_try_cmpxchg64, __VA_ARGS__)
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#endif
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#endif /* arch_try_cmpxchg64_relaxed */
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#ifndef arch_atomic_read_acquire
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static __always_inline int
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arch_atomic_read_acquire(const atomic_t *v)
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@ -2386,4 +2456,4 @@ arch_atomic64_dec_if_positive(atomic64_t *v)
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#endif
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#endif /* _LINUX_ATOMIC_FALLBACK_H */
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// 8e2cc06bc0d2c0967d2f8424762bd48555ee40ae
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// b5e87bdd5ede61470c29f7a7e4de781af3770f09
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@ -2006,6 +2006,44 @@ atomic_long_dec_if_positive(atomic_long_t *v)
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arch_try_cmpxchg_relaxed(__ai_ptr, __ai_oldp, __VA_ARGS__); \
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})
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#define try_cmpxchg64(ptr, oldp, ...) \
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({ \
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typeof(ptr) __ai_ptr = (ptr); \
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typeof(oldp) __ai_oldp = (oldp); \
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kcsan_mb(); \
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instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
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instrument_atomic_write(__ai_oldp, sizeof(*__ai_oldp)); \
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arch_try_cmpxchg64(__ai_ptr, __ai_oldp, __VA_ARGS__); \
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})
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#define try_cmpxchg64_acquire(ptr, oldp, ...) \
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({ \
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typeof(ptr) __ai_ptr = (ptr); \
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typeof(oldp) __ai_oldp = (oldp); \
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instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
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instrument_atomic_write(__ai_oldp, sizeof(*__ai_oldp)); \
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arch_try_cmpxchg64_acquire(__ai_ptr, __ai_oldp, __VA_ARGS__); \
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})
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#define try_cmpxchg64_release(ptr, oldp, ...) \
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({ \
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typeof(ptr) __ai_ptr = (ptr); \
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typeof(oldp) __ai_oldp = (oldp); \
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kcsan_release(); \
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instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
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instrument_atomic_write(__ai_oldp, sizeof(*__ai_oldp)); \
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arch_try_cmpxchg64_release(__ai_ptr, __ai_oldp, __VA_ARGS__); \
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})
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#define try_cmpxchg64_relaxed(ptr, oldp, ...) \
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({ \
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typeof(ptr) __ai_ptr = (ptr); \
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typeof(oldp) __ai_oldp = (oldp); \
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instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
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instrument_atomic_write(__ai_oldp, sizeof(*__ai_oldp)); \
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arch_try_cmpxchg64_relaxed(__ai_ptr, __ai_oldp, __VA_ARGS__); \
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})
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#define cmpxchg_local(ptr, ...) \
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({ \
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typeof(ptr) __ai_ptr = (ptr); \
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@ -2045,4 +2083,4 @@ atomic_long_dec_if_positive(atomic_long_t *v)
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})
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#endif /* _LINUX_ATOMIC_INSTRUMENTED_H */
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// 87c974b93032afd42143613434d1a7788fa598f9
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// 764f741eb77a7ad565dc8d99ce2837d5542e8aee
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@ -164,41 +164,44 @@ gen_xchg_fallbacks()
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gen_try_cmpxchg_fallback()
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{
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local cmpxchg="$1"; shift;
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local order="$1"; shift;
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cat <<EOF
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#ifndef arch_try_cmpxchg${order}
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#define arch_try_cmpxchg${order}(_ptr, _oldp, _new) \\
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#ifndef arch_try_${cmpxchg}${order}
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#define arch_try_${cmpxchg}${order}(_ptr, _oldp, _new) \\
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({ \\
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typeof(*(_ptr)) *___op = (_oldp), ___o = *___op, ___r; \\
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___r = arch_cmpxchg${order}((_ptr), ___o, (_new)); \\
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___r = arch_${cmpxchg}${order}((_ptr), ___o, (_new)); \\
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if (unlikely(___r != ___o)) \\
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*___op = ___r; \\
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likely(___r == ___o); \\
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})
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#endif /* arch_try_cmpxchg${order} */
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#endif /* arch_try_${cmpxchg}${order} */
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EOF
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}
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gen_try_cmpxchg_fallbacks()
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{
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printf "#ifndef arch_try_cmpxchg_relaxed\n"
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printf "#ifdef arch_try_cmpxchg\n"
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local cmpxchg="$1"; shift;
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gen_basic_fallbacks "arch_try_cmpxchg"
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printf "#ifndef arch_try_${cmpxchg}_relaxed\n"
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printf "#ifdef arch_try_${cmpxchg}\n"
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printf "#endif /* arch_try_cmpxchg */\n\n"
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gen_basic_fallbacks "arch_try_${cmpxchg}"
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printf "#endif /* arch_try_${cmpxchg} */\n\n"
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for order in "" "_acquire" "_release" "_relaxed"; do
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gen_try_cmpxchg_fallback "${order}"
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gen_try_cmpxchg_fallback "${cmpxchg}" "${order}"
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done
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printf "#else /* arch_try_cmpxchg_relaxed */\n"
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printf "#else /* arch_try_${cmpxchg}_relaxed */\n"
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gen_order_fallbacks "arch_try_cmpxchg"
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gen_order_fallbacks "arch_try_${cmpxchg}"
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printf "#endif /* arch_try_cmpxchg_relaxed */\n\n"
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printf "#endif /* arch_try_${cmpxchg}_relaxed */\n\n"
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}
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cat << EOF
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@ -218,7 +221,9 @@ for xchg in "arch_xchg" "arch_cmpxchg" "arch_cmpxchg64"; do
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gen_xchg_fallbacks "${xchg}"
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done
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gen_try_cmpxchg_fallbacks
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for cmpxchg in "cmpxchg" "cmpxchg64"; do
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gen_try_cmpxchg_fallbacks "${cmpxchg}"
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done
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grep '^[a-z]' "$1" | while read name meta args; do
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gen_proto "${meta}" "${name}" "atomic" "int" ${args}
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@ -166,7 +166,7 @@ grep '^[a-z]' "$1" | while read name meta args; do
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done
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for xchg in "xchg" "cmpxchg" "cmpxchg64" "try_cmpxchg"; do
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for xchg in "xchg" "cmpxchg" "cmpxchg64" "try_cmpxchg" "try_cmpxchg64"; do
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for order in "" "_acquire" "_release" "_relaxed"; do
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gen_xchg "${xchg}" "${order}" ""
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printf "\n"
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