From: Nicolas Boichat <drinkcat@xxxxxxxxxxxx> Subject: kmemleak: increase DEBUG_KMEMLEAK_EARLY_LOG_SIZE default to 16K 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@xxxxxxxxxxxx Signed-off-by: Nicolas Boichat <drinkcat@xxxxxxxxxxxx> Suggested-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx> Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx> Acked-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx> Cc: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx> Cc: Kees Cook <keescook@xxxxxxxxxxxx> Cc: Petr Mladek <pmladek@xxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx> Cc: Joe Lawrence <joe.lawrence@xxxxxxxxxx> Cc: Uladzislau Rezki <urezki@xxxxxxxxx> Cc: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> Cc: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- lib/Kconfig.debug | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/lib/Kconfig.debug~kmemleak-increase-debug_kmemleak_early_log_size-default-to-16k +++ a/lib/Kconfig.debug @@ -580,7 +580,7 @@ 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 _
