linux-kernel - Re: [ammarfaizi2-block:tj/cgroup/for-next 3/5] kernel/cgroup/cgroup.c:6765: warning: expecting prototype for cgroup_get_from_fd(). Prototype was for cgroup_v1v2_get_from

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Date:   Tue, 11 Oct 2022 13:41:29 -0700
From:   Yosry Ahmed <yosryahmed@...gle.com>
To:     kernel test robot <lkp@...el.com>
Cc:     kbuild-all@...ts.01.org, Ammar Faizi <ammarfaizi2@...weeb.org>,
        "GNU/Weeb Mailing List" <gwml@...r.gnuweeb.org>,
        linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>
Subject: Re: [ammarfaizi2-block:tj/cgroup/for-next 3/5] kernel/cgroup/cgroup.c:6765:
 warning: expecting prototype for cgroup_get_from_fd(). Prototype was for
 cgroup_v1v2_get_from_fd() instead

On Tue, Oct 11, 2022 at 1:39 PM kernel test robot <lkp@...el.com> wrote:
>
> tree:   https://github.com/ammarfaizi2/linux-block tj/cgroup/for-next
> head:   8248fe413216732f98563e8882b6c6ae617c327b
> commit: a6d1ce5951185ee91bbe6909fe2758f3625561b0 [3/5] cgroup: add cgroup_v1v2_get_from_[fd/file]()
> config: m68k-randconfig-r005-20221010
> compiler: m68k-linux-gcc (GCC) 12.1.0
> 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/ammarfaizi2/linux-block/commit/a6d1ce5951185ee91bbe6909fe2758f3625561b0
>         git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
>         git fetch --no-tags ammarfaizi2-block tj/cgroup/for-next
>         git checkout a6d1ce5951185ee91bbe6909fe2758f3625561b0
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=m68k SHELL=/bin/bash kernel/cgroup/
>
> If you fix the issue, kindly add following tag where applicable
> | Reported-by: kernel test robot <lkp@...el.com>
>
> All warnings (new ones prefixed by >>):
>
>    kernel/cgroup/cgroup.c:6251: warning: Function parameter or member 'f' not described in 'cgroup_get_from_file'
> >> kernel/cgroup/cgroup.c:6765: warning: expecting prototype for cgroup_get_from_fd(). Prototype was for cgroup_v1v2_get_from_fd() instead
>    kernel/cgroup/cgroup.c:6783: warning: Function parameter or member 'fd' not described in 'cgroup_get_from_fd'
>
>
> vim +6765 kernel/cgroup/cgroup.c
>
> 16af439645455fb kernel/cgroup.c        Tejun Heo        2015-11-20  6754
> 1f3fe7ebf6136c3 kernel/cgroup.c        Martin KaFai Lau 2016-06-30  6755  /**
> 1f3fe7ebf6136c3 kernel/cgroup.c        Martin KaFai Lau 2016-06-30  6756   * cgroup_get_from_fd - get a cgroup pointer from a fd

Ugh I forgot to update this line in the comment. Tejun, is this
patchable in place or should I send a patch for this?

> a6d1ce5951185ee kernel/cgroup/cgroup.c Yosry Ahmed      2022-10-11  6757   * @fd: fd obtained by open(cgroup_dir)
> 1f3fe7ebf6136c3 kernel/cgroup.c        Martin KaFai Lau 2016-06-30  6758   *
> 1f3fe7ebf6136c3 kernel/cgroup.c        Martin KaFai Lau 2016-06-30  6759   * Find the cgroup from a fd which should be obtained
> 1f3fe7ebf6136c3 kernel/cgroup.c        Martin KaFai Lau 2016-06-30  6760   * by opening a cgroup directory.  Returns a pointer to the
> 1f3fe7ebf6136c3 kernel/cgroup.c        Martin KaFai Lau 2016-06-30  6761   * cgroup on success. ERR_PTR is returned if the cgroup
> 1f3fe7ebf6136c3 kernel/cgroup.c        Martin KaFai Lau 2016-06-30  6762   * cannot be found.
> 1f3fe7ebf6136c3 kernel/cgroup.c        Martin KaFai Lau 2016-06-30  6763   */
> a6d1ce5951185ee kernel/cgroup/cgroup.c Yosry Ahmed      2022-10-11  6764  struct cgroup *cgroup_v1v2_get_from_fd(int fd)
> 1f3fe7ebf6136c3 kernel/cgroup.c        Martin KaFai Lau 2016-06-30 @6765  {
> 1f3fe7ebf6136c3 kernel/cgroup.c        Martin KaFai Lau 2016-06-30  6766        struct cgroup *cgrp;
> 1f3fe7ebf6136c3 kernel/cgroup.c        Martin KaFai Lau 2016-06-30  6767        struct file *f;
> 1f3fe7ebf6136c3 kernel/cgroup.c        Martin KaFai Lau 2016-06-30  6768
> 1f3fe7ebf6136c3 kernel/cgroup.c        Martin KaFai Lau 2016-06-30  6769        f = fget_raw(fd);
> 1f3fe7ebf6136c3 kernel/cgroup.c        Martin KaFai Lau 2016-06-30  6770        if (!f)
> 1f3fe7ebf6136c3 kernel/cgroup.c        Martin KaFai Lau 2016-06-30  6771                return ERR_PTR(-EBADF);
> 1f3fe7ebf6136c3 kernel/cgroup.c        Martin KaFai Lau 2016-06-30  6772
> a6d1ce5951185ee kernel/cgroup/cgroup.c Yosry Ahmed      2022-10-11  6773        cgrp = cgroup_v1v2_get_from_file(f);
> 1f3fe7ebf6136c3 kernel/cgroup.c        Martin KaFai Lau 2016-06-30  6774        fput(f);
> 1f3fe7ebf6136c3 kernel/cgroup.c        Martin KaFai Lau 2016-06-30  6775        return cgrp;
> 1f3fe7ebf6136c3 kernel/cgroup.c        Martin KaFai Lau 2016-06-30  6776  }
> a6d1ce5951185ee kernel/cgroup/cgroup.c Yosry Ahmed      2022-10-11  6777
>
> :::::: The code at line 6765 was first introduced by commit
> :::::: 1f3fe7ebf6136c341012db9f554d4caa566fcbaa cgroup: Add cgroup_get_from_fd
>
> :::::: TO: Martin KaFai Lau <kafai@...com>
> :::::: CC: David S. Miller <davem@...emloft.net>
>
> --
> 0-DAY CI Kernel Test Service
> https://01.org/lkp