Re: [PATCH v2 09/19] arm64: mte: Add specific SIGSEGV codes

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On Thu, Feb 27, 2020 at 06:33:14AM +0800, kbuild test robot wrote:
> url:    https://github.com/0day-ci/linux/commits/Catalin-Marinas/arm64-Memory-Tagging-Extension-user-space-support/20200227-041230
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc.git for-next
> config: x86_64-defconfig (attached as .config)
> compiler: gcc-7 (Debian 7.5.0-5) 7.5.0
> reproduce:
>         # save the attached .config to linux build tree
>         make ARCH=x86_64 
> 
> If you fix the issue, kindly add following tag
> Reported-by: kbuild test robot <lkp@xxxxxxxxx>
> 
> All error/warnings (new ones prefixed by >>):
> 
>    In file included from include/linux/export.h:43:0,
>                     from include/linux/linkage.h:7,
>                     from arch/x86/include/asm/cache.h:5,
>                     from include/linux/cache.h:6,
>                     from include/linux/time.h:5,
>                     from include/linux/compat.h:10,
>                     from arch/x86/kernel/signal_compat.c:2:
>    In function 'signal_compat_build_tests',
>        inlined from 'sigaction_compat_abi' at arch/x86/kernel/signal_compat.c:166:2:
> >> include/linux/compiler.h:350:38: error: call to '__compiletime_assert_30' declared with attribute error: BUILD_BUG_ON failed: NSIGSEGV != 7

I haven't realised that x86 has a build check for NSIGSEGV. I'll fold in
the diff below (there are no new fields added to siginfo, so no other
changes necessary):

diff --git a/arch/x86/kernel/signal_compat.c b/arch/x86/kernel/signal_compat.c
index 9ccbf0576cd0..a7f3e12cfbdb 100644
--- a/arch/x86/kernel/signal_compat.c
+++ b/arch/x86/kernel/signal_compat.c
@@ -27,7 +27,7 @@ static inline void signal_compat_build_tests(void)
 	 */
 	BUILD_BUG_ON(NSIGILL  != 11);
 	BUILD_BUG_ON(NSIGFPE  != 15);
-	BUILD_BUG_ON(NSIGSEGV != 7);
+	BUILD_BUG_ON(NSIGSEGV != 9);
 	BUILD_BUG_ON(NSIGBUS  != 5);
 	BUILD_BUG_ON(NSIGTRAP != 5);
 	BUILD_BUG_ON(NSIGCHLD != 6);

-- 
Catalin



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