linux-kernel - Re: [PATCH v4 2/3] riscv: optimized memmove

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Message-ID: <CAFnufp2bhWVd-SdSaK3ppFNkoBpJa+-0+kSrWzdxrmYNjyM+Zg@mail.gmail.com>
Date:   Mon, 27 Sep 2021 12:48:56 +0200
From:   Matteo Croce <mcroce@...ux.microsoft.com>
To:     kernel test robot <lkp@...el.com>
Cc:     linux-riscv <linux-riscv@...ts.infradead.org>,
        kbuild-all@...ts.01.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Atish Patra <atish.patra@....com>,
        Emil Renner Berthing <kernel@...il.dk>,
        Akira Tsukamoto <akira.tsukamoto@...il.com>,
        Drew Fustini <drew@...gleboard.org>
Subject: Re: [PATCH v4 2/3] riscv: optimized memmove

On Mon, Sep 20, 2021 at 12:06 AM kernel test robot <lkp@...el.com> wrote:
>
> Hi Matteo,
>
> Thank you for the patch! Yet something to improve:
>
> [auto build test ERROR on linux/master]
> [also build test ERROR on linus/master v5.15-rc1 next-20210917]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch]
>
> url:    https://github.com/0day-ci/linux/commits/Matteo-Croce/riscv-optimized-mem-functions/20210920-032303
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git bdb575f872175ed0ecf2638369da1cb7a6e86a14
> config: riscv-randconfig-r004-20210919 (attached as .config)
> compiler: riscv64-linux-gcc (GCC) 11.2.0
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # https://github.com/0day-ci/linux/commit/9a948fd7d78a58890608e9dd0f77e5ff84f36e3e
>         git remote add linux-review https://github.com/0day-ci/linux
>         git fetch --no-tags linux-review Matteo-Croce/riscv-optimized-mem-functions/20210920-032303
>         git checkout 9a948fd7d78a58890608e9dd0f77e5ff84f36e3e
>         # save the attached .config to linux build tree
>         mkdir build_dir
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=riscv SHELL=/bin/bash
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
>
> All errors (new ones prefixed by >>):
>
>    arch/riscv/lib/string.c: In function '__memmove':
> >> arch/riscv/lib/string.c:89:7: error: inlining failed in call to 'always_inline' 'memcpy': function body can be overwritten at link time
>       89 | void *memcpy(void *dest, const void *src, size_t count) __weak __alias(__memcpy);
>          |       ^~~~~~
>    arch/riscv/lib/string.c:99:24: note: called from here
>       99 |                 return memcpy(dest, src, count);
>          |                        ^~~~~~~~~~~~~~~~~~~~~~~~
>
>
> vim +89 arch/riscv/lib/string.c
>
> 86c5866e9b7fdd Matteo Croce 2021-09-19  88
> 86c5866e9b7fdd Matteo Croce 2021-09-19 @89  void *memcpy(void *dest, const void *src, size_t count) __weak __alias(__memcpy);
> 86c5866e9b7fdd Matteo Croce 2021-09-19  90  EXPORT_SYMBOL(memcpy);
> 9a948fd7d78a58 Matteo Croce 2021-09-19  91
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

How can we fix this? Maybe calling __memcpy() instead?

-- 
per aspera ad upstream