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

From: Rong Chen
Date: Wed May 26 2021 - 04:13:16 EST

On 5/26/21 6:29 AM, Marco Elver wrote:
On Wed, 26 May 2021 at 00:23, kernel test robot <lkp@xxxxxxxxx> 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]

base: dd860052c99b1e088352bdd4fb7aef46f8d2ef47
config: s390-randconfig-r002-20210525 (attached as .config)
compiler: clang version 13.0.0 ( 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

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. :-)

-- Marco
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