linux-kernel - Re: lib/test_bitmap.c:920:2: error: call to __compiletime_assert_348 declared with 'error' attribute: BUILD_BUG_ON failed: !__builtin_constant

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Message-ID: <CAKwvOdndG5O-UAc4Y-Rj8MGRni1xrjwyBTb+D1nh2Qpi3wWXUQ@mail.gmail.com>
Date:   Mon, 17 Jul 2023 11:24:23 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Yury Norov <yury.norov@...il.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Alexander Lobakin <alexandr.lobakin@...el.com>,
        kernel test robot <lkp@...el.com>, llvm@...ts.linux.dev,
        oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: lib/test_bitmap.c:920:2: error: call to __compiletime_assert_348
 declared with 'error' attribute: BUILD_BUG_ON failed: !__builtin_constant_p(res)

On Mon, Jul 17, 2023 at 11:09 AM Yury Norov <yury.norov@...il.com> wrote:
>
> On Mon, Jul 17, 2023 at 09:35:49AM -0700, Nick Desaulniers wrote:
> > On Mon, Jul 17, 2023 at 3:04 AM Andy Shevchenko
> > <andriy.shevchenko@...ux.intel.com> wrote:
> > >
> > > On Mon, Jul 17, 2023 at 12:42:57PM +0800, kernel test robot wrote:
> > > > Hi Alexander,
> > > >
> > > > FYI, the error/warning still remains.
> > >
> > > Alexander, either you can escalate this or just propose something to discuss.
> >
> > https://github.com/ClangBuiltLinux/linux/issues/1874
> > Sorry, a few more fires have popped up in the meantime.  Regardless of
> > changes to the compiler, we still support many versions of clang for
> > the kernel, so we'd need some workaround in the tests regardless.  I
> > saw there was already one for s390 + clang, but from this report we
> > will need another. Feel free to use that link above in comments in the
> > tests; we will clean those up once I have a better grasp on what's
> > going on with the compiler here.
>
> So, it's:
>  - not related to bitmap code,
>  - not only s390 issue, and
>  - fires with CLANG when GCOV and KASAN are enabled together.
>
> Is that correct? If so, I can disable the test for CLANG+GCOV+KASAN
> configuration unless the above is fixed.
>
> Nick, can you please confirm?

Yes, and I think disabling the test for that combination is the way to
go for now. I will sort out what's going on with this config and
hopefully we can relax that combination in the future.

>
> Because it's a build breaker, I'd like to have it fixed in v6.5.
>
> Thanks,
> Yury



-- 
Thanks,
~Nick Desaulniers