Re: [PATCH v2 09/19] arm64: mte: Add specific SIGSEGV codes | linux-arm-kernel

(off-list ancestor, not in this archive)

Catalin Marinas [off-list ref] 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 <redacted>

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" <redacted>

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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