The patch titled
Subject: mm/kmemleak: disable KASAN instrumentation in kmemleak
has been added to the -mm mm-unstable branch. Its filename is
mm-kmemleak-disable-kasan-instrumentation-in-kmemleak.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-kmemleak-disable-kasan-instrumentation-in-kmemleak.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Waiman Long <longman@xxxxxxxxxx>
Subject: mm/kmemleak: disable KASAN instrumentation in kmemleak
Date: Thu, 7 Mar 2024 14:05:48 -0500
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.
Link: https://lkml.kernel.org/r/20240307190548.963626-3-longman@xxxxxxxxxx
Signed-off-by: Waiman Long <longman@xxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/Makefile | 1 +
1 file changed, 1 insertion(+)
--- a/mm/Makefile~mm-kmemleak-disable-kasan-instrumentation-in-kmemleak
+++ a/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
_
Patches currently in -mm which might be from longman@xxxxxxxxxx are
mm-kmemleak-compact-kmemleak_object-further.patch
mm-kmemleak-disable-kasan-instrumentation-in-kmemleak.patch
