linux-kernel - [PATCH] kasan: default to inline instrumentation

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Message-Id: <20231109155101.186028-1-paul.heidekrueger@tum.de>
Date:   Thu,  9 Nov 2023 15:51:00 +0000
From:   Paul Heidekrüger <paul.heidekrueger@....de>
To:     Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org
Cc:     Paul Heidekrüger <paul.heidekrueger@....de>
Subject: [PATCH] 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.

CC: Dmitry Vyukov <dvyukov@...gle.com>
Reported-by: Andrey Konovalov <andreyknvl@...il.com>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=203495
Signed-off-by: Paul Heidekrüger <paul.heidekrueger@....de>
---
 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