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

From: [email-masked] (Eric W. Biederman)
Date: Thu, 27 Feb 2020 09:20:23 -0600

Catalin Marinas <[email-masked]> writes:

> 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 <[email-masked]>
>> 
>> 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):

Yes.  That looks good.

Acked-by: "Eric W. Biederman" <[email-masked]>

> 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);

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