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From: Andrey Ryabinin <>
To: Andrew Morton <>,
	Stephen Rothwell <>
	Andrey Ryabinin <>
Subject: [PATCH] kasan: fix build warnings
Date: Wed, 04 Feb 2015 14:43:51 +0300	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Some versions of gcc produce warning instead of error when
-fsanitize flag uses unsupported argument:

This breaks our detection of whether -fsanitize=kernel-address
is supported by compiler or not. Thus we have tons of build
warnings like this:
	x86_64-linux-gcc: warning: unrecognized argument to -fsanitize= option: 'kernel-address'

Passing -Werror into $(call cc-option) will fix this problem
as gcc will error out now.

Signed-off-by: Andrey Ryabinin <>
Reported-by: Stephen Rothwell <>

Hi Andrew, this patch applies on top kasan patch set.
We can't just fix add-kernel-address-sanitizer-infrastructure.patch
as patch  kasan-enable-instrumentation-of-global-variables.patch
depends on it.

Let me know if your prefer to update all needed patches instead
of this fix.

 scripts/Makefile.kasan | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/scripts/Makefile.kasan b/scripts/Makefile.kasan
index df302f8..72a40bb 100644
--- a/scripts/Makefile.kasan
+++ b/scripts/Makefile.kasan
@@ -5,15 +5,14 @@ else
 	call_threshold := 0
-CFLAGS_KASAN_MINIMAL := $(call cc-option, -fsanitize=kernel-address \
-				--param asan-globals=1)
+CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address --param asan-globals=1
 CFLAGS_KASAN := $(call cc-option, -fsanitize=kernel-address \
 		-fasan-shadow-offset=$(CONFIG_KASAN_SHADOW_OFFSET) \
 		--param asan-stack=1 --param asan-globals=1 \
 		--param asan-instrumentation-with-call-threshold=$(call_threshold))
+ifeq ($(call cc-option, $(CFLAGS_KASAN_MINIMAL) -Werror),)
         $(warning Cannot use CONFIG_KASAN: \
             -fsanitize=kernel-address is not supported by compiler)

  reply	other threads:[~2015-02-04 11:44 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-04  7:53 linux-next: build failure after merge of the akpm-current tree Stephen Rothwell
2015-02-04 11:43 ` Andrey Ryabinin [this message]
2015-02-04 12:05   ` [PATCH] kasan: fix build warnings Andrey Ryabinin
2015-02-04 12:23     ` Michal Marek

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