linux-kernel - Re: [PATCH v2] mips: lib: uncached: fix non-standard usage of variable 'sp'

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Date:   Sun, 20 Dec 2020 09:37:11 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Anders Roxell <anders.roxell@...aro.org>
Cc:     Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-mips@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        lkft-triage@...ts.linaro.org
Subject: Re: [PATCH v2] mips: lib: uncached: fix non-standard usage of
 variable 'sp'

On Mon, 14 Dec 2020 at 21:05, Thomas Bogendoerfer
<tsbogend@...ha.franken.de> wrote:
>
> On Fri, Dec 11, 2020 at 11:24:37AM +0100, Anders Roxell wrote:
> > When building mips tinyconfig with clang the following warning show up:
> >
> > arch/mips/lib/uncached.c:45:6: warning: variable 'sp' is uninitialized when used here [-Wuninitialized]
> >         if (sp >= (long)CKSEG0 && sp < (long)CKSEG2)
> >             ^~
> > arch/mips/lib/uncached.c:40:18: note: initialize the variable 'sp' to silence this warning
> >         register long sp __asm__("$sp");
> >                         ^
> >                          = 0
> > 1 warning generated.

<trimp>

> > [1] https://docs.w3cub.com/gcc~10/local-register-variables
> > Signed-off-by: Anders Roxell <anders.roxell@...aro.org>
> > ---
> >  arch/mips/lib/uncached.c | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
>
> applied to mips-next.

We have noticed these build failures on stable tree also.
May I request you to initiate the process to get into the stable tree
and for the following branches.
 - linux-5.10.y
 - linux-5.9.y
 - linux-5.4.y
 - linux-4.19.y

- Naresh