linux-kernel - Re: spinlock.c:306:9: error: implicit declaration of function '__raw_write_lock

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Date:   Tue, 23 Nov 2021 15:48:34 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Linux-sh list <linux-sh@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Minchan Kim <minchan@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Galbraith <umgwanakikbuti@...il.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>, lkft-triage@...ts.linaro.org
Subject: Re: spinlock.c:306:9: error: implicit declaration of function '__raw_write_lock_nested'

Hi Arnd,

On Tue, Nov 23, 2021 at 2:50 PM Arnd Bergmann <arnd@...db.de> wrote:
> On Tue, Nov 23, 2021 at 12:38 PM Naresh Kamboju
> <naresh.kamboju@...aro.org> wrote:
> >
> > While building Linux next 20211123 tag for sh with gcc-11
> > following warnings / errors noticed.
>
> Nothing in here looks like a recent regression from either the kernel
> or gcc-11.

Except for:

    kernel/locking/spinlock.c:306:9: error: implicit declaration of
    function '__raw_write_lock_nested'; did you mean
    '_raw_write_lock_nested'? [-Werror=implicit-function-declaration]
      306 |         __raw_write_lock_nested(lock, subclass);
          |         ^~~~~~~~~~~~~~~~~~~~~~~
          |         _raw_write_lock_nested

Which was also reported for other architectures:
https://lore.kernel.org/all/202111201111.c2ApGeHR-lkp@intel.com/

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds