[PATCH] kasan: default to inline instrumentation

[Paul Heidekrüger]

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.

CC: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Reported-by: Andrey Konovalov <andreyknvl@xxxxxxxxx>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=203495
Signed-off-by: Paul Heidekrüger <paul.heidekrueger@xxxxxx>
---
 lib/Kconfig.kasan | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
index fdca89c05745..935eda08b1e1 100644
--- a/lib/Kconfig.kasan
+++ b/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"
-- 
2.40.1