kasan: default to inline instrumentation

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/[email protected] Signed-off-by: Paul Heidekrüger <[email protected]> Reported-by: Andrey Konovalov <[email protected]> Reviewed-by: Marco Elver <[email protected]> Closes: https://bugzilla.kernel.org/show_bug.cgi?id=203495 Acked-by: Andrey Konovalov <[email protected]> Cc: Dmitry Vyukov <[email protected]> Cc: Alexander Potapenko <[email protected]> Cc: Andrey Ryabinin <[email protected]> Cc: Vincenzo Frascino <[email protected]> Signed-off-by: Andrew Morton <[email protected]>
herbertx · Dec 11, 2023 · 83a6fdd · 83a6fdd
1 parent 932b59e
commit 83a6fdd
Showing 1 changed file with 1 addition and 1 deletion.
diff --git 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"