linux-kernel - [ammarfaizi2-block:brauner/linux/fs.idmapped.overlay.acl.fix 1/1] fs/overlayfs/overlayfs.h:273:58: error: passing 'const void *' to parameter of type 'void *' discards qualifiers

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Date:   Wed, 6 Jul 2022 01:06:18 +0800
From:   kernel test robot <lkp@...el.com>
To:     Christian Brauner <brauner@...nel.org>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        linux-kernel@...r.kernel.org
Subject: [ammarfaizi2-block:brauner/linux/fs.idmapped.overlay.acl.fix 1/1]
 fs/overlayfs/overlayfs.h:273:58: error: passing 'const void *' to parameter
 of type 'void *' discards qualifiers

tree:   https://github.com/ammarfaizi2/linux-block brauner/linux/fs.idmapped.overlay.acl.fix
head:   05bde3ad56201ff691db6d95ea1316983ea82a9c
commit: 05bde3ad56201ff691db6d95ea1316983ea82a9c [1/1] acl: report correct ownership in some ovl use-cases
config: hexagon-randconfig-r045-20220703 (https://download.01.org/0day-ci/archive/20220706/202207060052.GNVFHePq-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 142aca7741d5b06207e87bf4880fbe308c8d6823)
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/05bde3ad56201ff691db6d95ea1316983ea82a9c
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block brauner/linux/fs.idmapped.overlay.acl.fix
        git checkout 05bde3ad56201ff691db6d95ea1316983ea82a9c
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash fs/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   In file included from fs/overlayfs/super.c:18:
>> fs/overlayfs/overlayfs.h:273:58: error: passing 'const void *' to parameter of type 'void *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
           return ovl_do_setxattr(ofs, dentry, ovl_xattr(ofs, ox), value, size, 0);
                                                                   ^~~~~
   fs/overlayfs/overlayfs.h:259:31: note: passing argument to parameter 'value' here
                                     const char *name, void *value,
                                                             ^
   1 error generated.
--
   In file included from fs/overlayfs/inode.c:17:
>> fs/overlayfs/overlayfs.h:273:58: error: passing 'const void *' to parameter of type 'void *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
           return ovl_do_setxattr(ofs, dentry, ovl_xattr(ofs, ox), value, size, 0);
                                                                   ^~~~~
   fs/overlayfs/overlayfs.h:259:31: note: passing argument to parameter 'value' here
                                     const char *name, void *value,
                                                             ^
>> fs/overlayfs/inode.c:378:48: error: passing 'const void *' to parameter of type 'void *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
                   err = ovl_do_setxattr(ofs, realdentry, name, value, size,
                                                                ^~~~~
   fs/overlayfs/overlayfs.h:259:31: note: passing argument to parameter 'value' here
                                     const char *name, void *value,
                                                             ^
   2 errors generated.


vim +273 fs/overlayfs/overlayfs.h

c914c0e27eb084 Amir Goldstein 2022-04-04  268  
c914c0e27eb084 Amir Goldstein 2022-04-04  269  static inline int ovl_setxattr(struct ovl_fs *ofs, struct dentry *dentry,
43d193f8440d67 Miklos Szeredi 2020-09-02  270  			       enum ovl_xattr ox, const void *value,
610afc0bd40882 Miklos Szeredi 2020-09-02  271  			       size_t size)
e9be9d5e76e348 Miklos Szeredi 2014-10-24  272  {
c914c0e27eb084 Amir Goldstein 2022-04-04 @273  	return ovl_do_setxattr(ofs, dentry, ovl_xattr(ofs, ox), value, size, 0);
e9be9d5e76e348 Miklos Szeredi 2014-10-24  274  }
e9be9d5e76e348 Miklos Szeredi 2014-10-24  275  

:::::: The code at line 273 was first introduced by commit
:::::: c914c0e27eb0843b7cf3bec71d6f34d53a3a671e ovl: use wrappers to all vfs_*xattr() calls

:::::: TO: Amir Goldstein <amir73il@...il.com>
:::::: CC: Miklos Szeredi <mszeredi@...hat.com>

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