linux-kernel - Re: [linux-stable-rc:linux-4.19.y 1181/1498] ERROR: "__compiletime_assert_491" [drivers/gpu/drm/i915/i915.ko] undefined!

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Date:   Thu, 5 Aug 2021 16:23:40 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     kernel test robot <lkp@...el.com>
Cc:     clang-built-linux@...glegroups.com, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: [linux-stable-rc:linux-4.19.y 1181/1498] ERROR:
 "__compiletime_assert_491" [drivers/gpu/drm/i915/i915.ko] undefined!

On Thu, Aug 5, 2021 at 1:24 PM kernel test robot <lkp@...el.com> wrote:
>
> Hi Nick,
>
> First bad commit (maybe != root cause):
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.19.y
> head:   7457eed4b647560ae1b1800c295efc5f1db22e4b
> commit: 7c29fd831799d09474dfdae556207b7102647a45 [1181/1498] lib/string.c: implement stpcpy
> config: x86_64-randconfig-r024-20210805 (attached as .config)
> compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 31a71a393f65d9e07b5b0756fef9dd16690950ee)
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git/commit/?id=7c29fd831799d09474dfdae556207b7102647a45
>         git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
>         git fetch --no-tags linux-stable-rc linux-4.19.y
>         git checkout 7c29fd831799d09474dfdae556207b7102647a45
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
>
> All errors (new ones prefixed by >>):
>
> >> ERROR: "__compiletime_assert_491" [drivers/gpu/drm/i915/i915.ko] undefined!

^ I'm actively trying to improve these diagnostics in LLVM at the
moment. Hopefully that will make this report clearer!
https://reviews.llvm.org/D106030

>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org



-- 
Thanks,
~Nick Desaulniers