stackdepot used to call memcpy(), which compiler tools normally instrument, therefore every lookup used to unnecessarily call instrumented code. This is somewhat ok in the case of KASAN, but under KMSAN a lot of time was spent in the instrumentation. (A similar change has been previously committed for memcmp()) Signed-off-by: Alexander Potapenko <glider@xxxxxxxxxx> Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx> Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx> --- lib/stackdepot.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/lib/stackdepot.c b/lib/stackdepot.c index e513459a5601..d48c744fa750 100644 --- a/lib/stackdepot.c +++ b/lib/stackdepot.c @@ -140,7 +140,7 @@ static struct stack_record *depot_alloc_stack(unsigned long *entries, int size, stack->handle.slabindex = depot_index; stack->handle.offset = depot_offset >> STACK_ALLOC_ALIGN; stack->handle.valid = 1; - memcpy(stack->entries, entries, size * sizeof(unsigned long)); + __memcpy(stack->entries, entries, size * sizeof(unsigned long)); depot_offset += required_size; return stack; -- 2.17.0.441.gb46fe60e1d-goog
