| From: Paul Heidekrüger <paul.heidekrueger@tum.de> |
| Subject: kasan: default to inline instrumentation |
| Date: Thu, 9 Nov 2023 15:51:00 +0000 |
| |
| KASan inline instrumentation can yield up to a 2x performance gain at the |
| cost of a larger binary. |
| |
| Make inline instrumentation the default, as suggested in the bug report |
| below. |
| |
| When an architecture does not support inline instrumentation, it should |
| set ARCH_DISABLE_KASAN_INLINE, as done by PowerPC, for instance. |
| |
| Link: https://lkml.kernel.org/r/20231109155101.186028-1-paul.heidekrueger@tum.de |
| Signed-off-by: Paul Heidekrüger <paul.heidekrueger@tum.de> |
| Reported-by: Andrey Konovalov <andreyknvl@gmail.com> |
| Reviewed-by: Marco Elver <elver@google.com> |
| Closes: https://bugzilla.kernel.org/show_bug.cgi?id=203495 |
| Acked-by: Andrey Konovalov <andreyknvl@gmail.com> |
| Cc: Dmitry Vyukov <dvyukov@google.com> |
| Cc: Alexander Potapenko <glider@google.com> |
| Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> |
| Cc: Vincenzo Frascino <vincenzo.frascino@arm.com> |
| Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
| --- |
| |
| lib/Kconfig.kasan | 2 +- |
| 1 file changed, 1 insertion(+), 1 deletion(-) |
| |
| --- a/lib/Kconfig.kasan~kasan-default-to-inline-instrumentation |
| +++ a/lib/Kconfig.kasan |
| @@ -134,7 +134,7 @@ endchoice |
| choice |
| prompt "Instrumentation type" |
| depends on KASAN_GENERIC || KASAN_SW_TAGS |
| - default KASAN_OUTLINE |
| + default KASAN_INLINE if !ARCH_DISABLE_KASAN_INLINE |
| |
| config KASAN_OUTLINE |
| bool "Outline instrumentation" |
| _ |
