Kmemleak ia a memory leak checker. KASAN is also a memory checker but it focuses more on finding out-of-bounds and use-after-free bugs. Since kmemleak is inherently slow especially on systems with large number of CPUs, adding KASAN instrumentation will make it slower even more. As kmemleak is not for production use, the utility of enabling KASAN there is questionable. This patch disables KASAN instrumentation for configurations that enable both of them to slightly reduce performance overhead. Signed-off-by: Waiman Long <longman@xxxxxxxxxx> --- mm/Makefile | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/Makefile b/mm/Makefile index e4b5b75aaec9..fc0f9a63a61e 100644 --- a/mm/Makefile +++ b/mm/Makefile @@ -5,6 +5,7 @@ KASAN_SANITIZE_slab_common.o := n KASAN_SANITIZE_slub.o := n +KASAN_SANITIZE_kmemleak.o := n KCSAN_SANITIZE_kmemleak.o := n # These produce frequent data race reports: most of them are due to races on -- 2.39.3
