From: Nicolas Boichat drinkcat@chromium.org
[ Upstream commit b751c52bb587ae66f773b15204ef7a147467f4c7 ]
The current default value (400) is too low on many systems (e.g. some ARM64 platform takes up 1000+ entries).
syzbot uses 16000 as default value, and has proved to be enough on beefy configurations, so let's pick that value.
This consumes more RAM on boot (each entry is 160 bytes, so in total ~2.5MB of RAM), but the memory would later be freed (early_log is __initdata).
Link: http://lkml.kernel.org/r/20190730154027.101525-1-drinkcat@chromium.org Signed-off-by: Nicolas Boichat drinkcat@chromium.org Suggested-by: Dmitry Vyukov dvyukov@google.com Acked-by: Catalin Marinas catalin.marinas@arm.com Acked-by: Dmitry Vyukov dvyukov@google.com Cc: Masahiro Yamada yamada.masahiro@socionext.com Cc: Kees Cook keescook@chromium.org Cc: Petr Mladek pmladek@suse.com Cc: Thomas Gleixner tglx@linutronix.de Cc: Tetsuo Handa penguin-kernel@I-love.SAKURA.ne.jp Cc: Joe Lawrence joe.lawrence@redhat.com Cc: Uladzislau Rezki urezki@gmail.com Cc: Andy Shevchenko andriy.shevchenko@linux.intel.com Cc: Stephen Rothwell sfr@canb.auug.org.au Cc: Andrey Ryabinin aryabinin@virtuozzo.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- lib/Kconfig.debug | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index fd1205a3dbdbc..7b9d7328f189e 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -521,7 +521,7 @@ config DEBUG_KMEMLEAK_EARLY_LOG_SIZE int "Maximum kmemleak early log entries" depends on DEBUG_KMEMLEAK range 200 40000 - default 400 + default 16000 help Kmemleak must track all the memory allocations to avoid reporting false positives. Since memory may be allocated or