linux-kernel - [mcgrof-next:20211116-sysctl-cleanups-v4 19/35] fs/proc/proc_sysctl.c:44:9: error: incompatible pointer types returning 'struct ctl_table_header *' from a function with result type 'struct sysctl

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Message-ID: <202111182042.kVqLKfnp-lkp@intel.com>
Date:   Thu, 18 Nov 2021 20:50:50 +0800
From:   kernel test robot <lkp@...el.com>
To:     Luis Chamberlain <mcgrof@...nel.org>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [mcgrof-next:20211116-sysctl-cleanups-v4 19/35]
 fs/proc/proc_sysctl.c:44:9: error: incompatible pointer types returning
 'struct ctl_table_header *' from a function with result type 'struct
 sysctl_header *'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git 20211116-sysctl-cleanups-v4
head:   5347239461f25fc50aa761923245b9ec4a4aafec
commit: 80084262576dad57737fa04b203e1547ff7ad538 [19/35] sysctl: add helper to register a sysctl mount point
config: i386-randconfig-c001-20211118 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c46becf500df2a7fb4b4fce16178a036c344315a)
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://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git/commit/?id=80084262576dad57737fa04b203e1547ff7ad538
        git remote add mcgrof-next https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git
        git fetch --no-tags mcgrof-next 20211116-sysctl-cleanups-v4
        git checkout 80084262576dad57737fa04b203e1547ff7ad538
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=i386 

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 >>):

>> fs/proc/proc_sysctl.c:44:9: error: incompatible pointer types returning 'struct ctl_table_header *' from a function with result type 'struct sysctl_header *' [-Werror,-Wincompatible-pointer-types]
           return register_sysctl(path, sysctl_mount_point);
                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   1 error generated.


vim +44 fs/proc/proc_sysctl.c

    36	
    37	/*
    38	 * Used to create permanently empty directories to serve as mount points.
    39	 * There are some subtle but important permission checks this allows in the
    40	 * case of unprivileged mounts.
    41	 */
    42	struct sysctl_header *register_sysctl_mount_point(const char *path)
    43	{
  > 44		return register_sysctl(path, sysctl_mount_point);
    45	}
    46	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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