linux-kernel - Re: [next] [clang] x86_64-linux-gnu-ld: mm/mremap.o: in function `move_pgt_entry': mremap.c:(.text+0x763): undefined reference to `__compiletime_assert

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Date:   Thu, 17 Jun 2021 14:51:49 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     Linux-Next Mailing List <linux-next@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        lkft-triage@...ts.linaro.org,
        open list <linux-kernel@...r.kernel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Stephen Boyd <swboyd@...omium.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Jessica Yu <jeyu@...nel.org>,
        Evan Green <evgreen@...omium.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Baoquan He <bhe@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Dave Young <dyoung@...hat.com>, Ingo Molnar <mingo@...hat.com>,
        Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        Sasha Levin <sashal@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vivek Goyal <vgoyal@...hat.com>, Will Deacon <will@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [next] [clang] x86_64-linux-gnu-ld: mm/mremap.o: in function
 `move_pgt_entry': mremap.c:(.text+0x763): undefined reference to
 `__compiletime_assert_342'

On Thu, Jun 17, 2021 at 06:15:45PM +0530, Naresh Kamboju wrote:
> On Thu, 17 Jun 2021 at 17:41, Naresh Kamboju <naresh.kamboju@...aro.org> wrote:
> > x86_64-linux-gnu-ld: mm/mremap.o: in function `move_pgt_entry':
> > mremap.c:(.text+0x763): undefined reference to `__compiletime_assert_342'
> 
> The git bisect pointed out the first bad commit.
> 
> The first bad commit:
> commit 928cf6adc7d60c96eca760c05c1000cda061604e
> Author: Stephen Boyd <swboyd@...omium.org>
> Date:   Thu Jun 17 15:21:35 2021 +1000
>     module: add printk formats to add module build ID to stacktraces

Your git bisect probably went astray.  There's no way that commit
caused that regression.