diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2020-08-29 22:03:35 +0900 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2020-10-12 18:27:27 +0200 |
| commit | 29f006fdefe6f88abde973a0b0f20d2704e93fd4 (patch) | |
| tree | 11df0a506bb05fdd72c07a4fed5bbdb80b3b7bf5 /scripts/atomic/gen-atomic-instrumented.sh | |
| parent | d741bf41d7c7db4898bacfcb020353cddc032fd8 (diff) | |
asm-generic/atomic: Add try_cmpxchg() fallbacks
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
Diffstat (limited to 'scripts/atomic/gen-atomic-instrumented.sh')
| -rwxr-xr-x | scripts/atomic/gen-atomic-instrumented.sh | 29 |
1 files changed, 23 insertions, 6 deletions
diff --git a/scripts/atomic/gen-atomic-instrumented.sh b/scripts/atomic/gen-atomic-instrumented.sh index 6afadf73da17..85dc25685c0d 100755 --- a/scripts/atomic/gen-atomic-instrumented.sh +++ b/scripts/atomic/gen-atomic-instrumented.sh @@ -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, 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__); \\ +#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 |