diff options
| -rw-r--r-- | arch/x86/kernel/alternative.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c index 85089c79a828..5f448142aa99 100644 --- a/arch/x86/kernel/alternative.c +++ b/arch/x86/kernel/alternative.c @@ -2751,6 +2751,13 @@ static void text_poke_bp_batch(struct text_poke_loc *tp, unsigned int nr_entries /* * Remove and wait for refs to be zero. + * + * Notably, if after step-3 above the INT3 got removed, then the + * text_poke_sync() will have serialized against any running INT3 + * handlers and the below spin-wait will not happen. + * + * IOW. unless the replacement instruction is INT3, this case goes + * unused. */ for_each_possible_cpu(i) { atomic_t *refs = per_cpu_ptr(&bp_refs, i); |