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| author | Ingo Molnar <mingo@kernel.org> | 2025-04-11 08:41:04 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2025-04-11 12:01:35 +0300 |
| commit | 4f9534719e524affb1aa8e0ff0c8b30c1c65e574 (patch) | |
| tree | e061209c9ae69b00a9a2dc492feb8c044390f5d0 | |
| parent | 023f42dd59203be8ad2fc0574af32d3b4ad041ec (diff) | |
| download | linux-4f9534719e524affb1aa8e0ff0c8b30c1c65e574.tar.xz | |
x86/alternatives: Add comment about noinstr expectations
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Juergen Gross <jgross@suse.com>
Cc: "H . Peter Anvin" <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250411054105.2341982-53-mingo@kernel.org
| -rw-r--r-- | arch/x86/kernel/alternative.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c index 231b2acbe360..604dd608d281 100644 --- a/arch/x86/kernel/alternative.c +++ b/arch/x86/kernel/alternative.c @@ -2447,6 +2447,11 @@ static struct smp_text_poke_array { static DEFINE_PER_CPU(atomic_t, text_poke_array_refs); +/* + * These four __always_inline annotations imply noinstr, necessary + * due to smp_text_poke_int3_handler() being noinstr: + */ + static __always_inline bool try_get_text_poke_array(void) { atomic_t *refs = this_cpu_ptr(&text_poke_array_refs); |