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From: Qian Cai <>
	Qian Cai <>
Subject: [PATCH] kasan: fix variable 'tag' set but not used warning
Date: Thu,  7 Mar 2019 13:52:44 -0500
Message-ID: <> (raw)

set_tag() compiles away when CONFIG_KASAN_SW_TAGS=n, so make
arch_kasan_set_tag() a static inline function to fix warnings below.

mm/kasan/common.c: In function '__kasan_kmalloc':
mm/kasan/common.c:475:5: warning: variable 'tag' set but not used
  u8 tag;

Signed-off-by: Qian Cai <>
 mm/kasan/kasan.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
index 3e0c11f7d7a1..3ce956efa0cb 100644
--- a/mm/kasan/kasan.h
+++ b/mm/kasan/kasan.h
@@ -163,7 +163,10 @@ static inline u8 random_tag(void)
 #ifndef arch_kasan_set_tag
-#define arch_kasan_set_tag(addr, tag)	((void *)(addr))
+static inline const void *arch_kasan_set_tag(const void *addr, u8 tag)
+	return addr;
 #ifndef arch_kasan_reset_tag
 #define arch_kasan_reset_tag(addr)	((void *)(addr))
2.17.2 (Apple Git-113)

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Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-07 18:52 Qian Cai [this message]
2019-03-08 13:28 ` Andrey Konovalov

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