linux-kernel - Re: [kbuild-all] Re: [PATCH] kcov: add __no_sanitize_coverage to fix noinstr for all architectures

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Date:   Wed, 26 May 2021 16:11:50 +0800
From:   Rong Chen <rong.a.chen@...el.com>
To:     Marco Elver <elver@...gle.com>, kernel test robot <lkp@...el.com>
Cc:     kbuild-all@...ts.01.org,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Will Deacon <will@...nel.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>
Subject: Re: [kbuild-all] Re: [PATCH] kcov: add __no_sanitize_coverage to fix
 noinstr for all architectures



On 5/26/21 6:29 AM, Marco Elver wrote:
> On Wed, 26 May 2021 at 00:23, kernel test robot <lkp@...el.com> wrote:
> [...]
>> [auto build test WARNING on linux/master]
>> [also build test WARNING on kees/for-next/pstore linus/master v5.13-rc3 next-20210525]
>> [If your patch is applied to the wrong git tree, kindly drop us a note.
>> And when submitting patch, we suggest to use '--base' as documented in
>> https://git-scm.com/docs/git-format-patch]
>>
>> url:    https://github.com/0day-ci/linux/commits/Marco-Elver/kcov-add-__no_sanitize_coverage-to-fix-noinstr-for-all-architectures/20210526-020046
>> base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git dd860052c99b1e088352bdd4fb7aef46f8d2ef47
>> config: s390-randconfig-r002-20210525 (attached as .config)
>> compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 99155e913e9bad5f7f8a247f8bb3a3ff3da74af1)
> ^^^ you're using a Clang pre-release, breakages are expected until
> Clang 13 is final.

Hi Marco,

I really appreciate for your comment, we'll update clang to the latest 
version.

Best Regards,
Rong Chen

>
> I think there was a thread about this at some point. I guess LKP has
> decided that testing Clang pre-releases is fair game? I guess it's
> useful, but this warning here needs to be ignored. It'll go away when
> you rebuild your pre-release Clang 13 from the latest LLVM main
> branch.
>
> [...]
>>>> arch/s390/kernel/nmi.c:182:6: warning: unknown sanitizer 'coverage' ignored [-Wunknown-sanitizers]
>>     void noinstr s390_handle_mcck(void)
>>          ^
>>     include/linux/compiler_types.h:213:35: note: expanded from macro 'noinstr'
>>             __no_kcsan __no_sanitize_address __no_sanitize_coverage
>>                                              ^
>>     include/linux/compiler-clang.h:49:59: note: expanded from macro '__no_sanitize_coverage'
>>     #define __no_sanitize_coverage __attribute__((no_sanitize("coverage")))
>>                                                               ^
> Clang 13 will support the attribute, but this is a pre-release Clang
> 13 -- so please ignore the report. FWIW, I tested my patch of course
> with a version of Clang 13 that supports the attribute. :-)
>
> Thanks,
> -- Marco
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