linux-kernel - Re: fs/proc/base.c:1767:14-18: WARNING: casting value returned by memory allocation function to (char *) is useless.

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Date:   Tue, 25 Jan 2022 11:01:02 +0800
From:   Hao Lee <haolee.swjtu@...il.com>
To:     kernel test robot <lkp@...el.com>
Cc:     kbuild-all@...ts.01.org, LKML <linux-kernel@...r.kernel.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: fs/proc/base.c:1767:14-18: WARNING: casting value returned by
 memory allocation function to (char *) is useless.

On Tue, Jan 25, 2022 at 10:36 AM kernel test robot <lkp@...el.com> wrote:
>
> tree:   https://github.com/0day-ci/linux/commits/UPDATE-20220123-215907/Hao-Lee/proc-use-kmalloc-instead-of-__get_free_page-to-alloc-path-buffer/20220123-181005
> head:   98106e76de95ae9aefa914ec056448a5571155dc
> commit: 98106e76de95ae9aefa914ec056448a5571155dc proc: alloc PATH_MAX bytes for /proc/${pid}/fd/ symlinks
> date:   35 hours ago
> config: i386-randconfig-c001-20220124 (https://download.01.org/0day-ci/archive/20220125/202201250941.1xbLnDRA-lkp@intel.com/config)
> compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
>
>
> cocci warnings: (new ones prefixed by >>)
> >> fs/proc/base.c:1767:14-18: WARNING: casting value returned by memory allocation function to (char *) is useless.

Hello, Alexey,

This patch has been added to the -mm tree, how do we deal with this problem...
Thanks.

>
> Please review and possibly fold the followup patch.
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org