linux-kernel - Re: mainline build failure for x86

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Message-ID: <CAHk-=whpa_FJjvzWdWdSzecTbVtndbQqg35=_o+ohM3X1_xKTA@mail.gmail.com>
Date:   Thu, 4 Aug 2022 14:59:01 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     Arnd Bergmann <arnd@...nel.org>,
        "Sudip Mukherjee (Codethink)" <sudipm.mukherjee@...il.com>,
        clang-built-linux <llvm@...ts.linux.dev>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: mainline build failure for x86_64 allmodconfig with clang

On Thu, Aug 4, 2022 at 1:43 PM Nathan Chancellor <nathan@...nel.org> wrote:
>
> I do note that commit 1b54a0121dba ("drm/amd/display: Reduce stack size
> in the mode support function") did have a workaround for GCC. It appears
> clang will still inline mode_support_configuration(). If I mark it as
> 'noinline', the warning disappears in that file.

That sounds like probably the best option for now. Gcc does not inline
that function (at least for allmodconfig builds in my testing), so if
that makes clang match what gcc does, it seems a reasonable thing to
do.

            Linus