linux-kernel - Re: [PATCH v4] Makefile.compiler: replace cc-ifversion with compiler-specific macros

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Message-ID: <b5d0cf82-0e42-f6a1-c9f5-c145fdc4c622@collabora.com>
Date:   Wed, 17 May 2023 17:39:14 +0200
From:   Ricardo Cañuelo <ricardo.canuelo@...labora.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Shreeya Patel <shreeya.patel@...labora.com>
Cc:     Michal Marek <michal.lkml@...kovi.net>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        clang-built-linux <llvm@...ts.linux.dev>,
        Bill Wendling <morbo@...gle.com>,
        Nathan Chancellor <nathan@...nel.org>,
        regressions@...ts.linux.dev,
        "gustavo.padovan@...labora.com" <gustavo.padovan@...labora.com>,
        Guillaume Charles Tucker <guillaume.tucker@...labora.com>,
        denys.f@...labora.com, kernelci@...ts.linux.dev
Subject: Re: [PATCH v4] Makefile.compiler: replace cc-ifversion with
 compiler-specific macros

Hi Nick,

On 16/5/23 1:01, Nick Desaulniers wrote:
> Can you please help verify this failure by hand, and see if applying
> https://github.com/ClangBuiltLinux/linux/commit/45c4fb6095d872785e077942da896d65d87ab56b.patch
> helps?  If you can repro; mind sharing your precise steps to reproduce?

I ran a few tests but the commit that introduced your changes
passes every time. There's a chance that the bisector got misled
due to the test runs failing for whatever reason unrelated to the
patch. There's definitely something introducing a bug somewhere,
as current mainline/master makes this test fail on this target
when kernel/configs/debug.config is applied, but it must be
somewhere else. I'll investigate this some more to see what I can
find.

About the steps to reproduce it, we're using the current KernelCI
tools (kci_build) to generate the kernel. To actually launch the
tests I'm submitting jobs to Collabora's LAVA lab, which is
something that isn't available to external users, so it might be
a bit hard for you to reproduce the exact environment from the
original test. If you need to test something, I can do it for
you.

Thanks,
Ricardo