Hi Mark,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on miklos-vfs/overlayfs-next]
[also build test ERROR on linus/master next-20201016]
[cannot apply to ext4/dev security/next-testing v5.9]
[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/Mark-Salyzyn/overlayfs-override_creds-off-nested-get-xattr-fix/20201019-195516
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs.git overlayfs-next
config: i386-randconfig-c001-20201019 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/1cb141c810d73ddaf9ef64889ed4d4fed81bb453
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Mark-Salyzyn/overlayfs-override_creds-off-nested-get-xattr-fix/20201019-195516
        git checkout 1cb141c810d73ddaf9ef64889ed4d4fed81bb453
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All error/warnings (new ones prefixed by >>):

   In file included from fs/overlayfs/super.c:18:
   fs/overlayfs/overlayfs.h: In function 'ovl_do_getxattr':
>> fs/overlayfs/overlayfs.h:187:32: error: passing argument 2 of '__vfs_getxattr' from incompatible pointer type [-Werror=incompatible-pointer-types]
     187 |  return __vfs_getxattr(dentry, name, value, size, XATTR_NOSECURITY);
         |                                ^~~~
         |                                |
         |                                const char *
   In file included from fs/overlayfs/super.c:10:
   include/linux/xattr.h:50:61: note: expected 'struct inode *' but argument is of type 'const char *'
      50 | ssize_t __vfs_getxattr(struct dentry *dentry, struct inode *inode,
         |                                               ~~~~~~~~~~~~~~^~~~~
   In file included from fs/overlayfs/super.c:18:
>> fs/overlayfs/overlayfs.h:187:45: warning: passing argument 4 of '__vfs_getxattr' makes pointer from integer without a cast [-Wint-conversion]
     187 |  return __vfs_getxattr(dentry, name, value, size, XATTR_NOSECURITY);
         |                                             ^~~~
         |                                             |
         |                                             size_t {aka unsigned int}
   In file included from fs/overlayfs/super.c:10:
   include/linux/xattr.h:51:34: note: expected 'void *' but argument is of type 'size_t' {aka 'unsigned int'}
      51 |          const char *name, void *buffer, size_t size, int flags);
         |                            ~~~~~~^~~~~~
   In file included from fs/overlayfs/super.c:18:
>> fs/overlayfs/overlayfs.h:187:9: error: too few arguments to function '__vfs_getxattr'
     187 |  return __vfs_getxattr(dentry, name, value, size, XATTR_NOSECURITY);
         |         ^~~~~~~~~~~~~~
   In file included from fs/overlayfs/super.c:10:
   include/linux/xattr.h:50:9: note: declared here
      50 | ssize_t __vfs_getxattr(struct dentry *dentry, struct inode *inode,
         |         ^~~~~~~~~~~~~~
   cc1: some warnings being treated as errors
--
   In file included from fs/overlayfs/namei.c:15:
   fs/overlayfs/overlayfs.h: In function 'ovl_do_getxattr':
>> fs/overlayfs/overlayfs.h:187:32: error: passing argument 2 of '__vfs_getxattr' from incompatible pointer type [-Werror=incompatible-pointer-types]
     187 |  return __vfs_getxattr(dentry, name, value, size, XATTR_NOSECURITY);
         |                                ^~~~
         |                                |
         |                                const char *
   In file included from fs/overlayfs/namei.c:11:
   include/linux/xattr.h:50:61: note: expected 'struct inode *' but argument is of type 'const char *'
      50 | ssize_t __vfs_getxattr(struct dentry *dentry, struct inode *inode,
         |                                               ~~~~~~~~~~~~~~^~~~~
   In file included from fs/overlayfs/namei.c:15:
>> fs/overlayfs/overlayfs.h:187:45: warning: passing argument 4 of '__vfs_getxattr' makes pointer from integer without a cast [-Wint-conversion]
     187 |  return __vfs_getxattr(dentry, name, value, size, XATTR_NOSECURITY);
         |                                             ^~~~
         |                                             |
         |                                             size_t {aka unsigned int}
   In file included from fs/overlayfs/namei.c:11:
   include/linux/xattr.h:51:34: note: expected 'void *' but argument is of type 'size_t' {aka 'unsigned int'}
      51 |          const char *name, void *buffer, size_t size, int flags);
         |                            ~~~~~~^~~~~~
   In file included from fs/overlayfs/namei.c:15:
>> fs/overlayfs/overlayfs.h:187:9: error: too few arguments to function '__vfs_getxattr'
     187 |  return __vfs_getxattr(dentry, name, value, size, XATTR_NOSECURITY);
         |         ^~~~~~~~~~~~~~
   In file included from fs/overlayfs/namei.c:11:
   include/linux/xattr.h:50:9: note: declared here
      50 | ssize_t __vfs_getxattr(struct dentry *dentry, struct inode *inode,
         |         ^~~~~~~~~~~~~~
   In file included from fs/overlayfs/namei.c:15:
>> fs/overlayfs/overlayfs.h:188:1: warning: control reaches end of non-void function [-Wreturn-type]
     188 | }
         | ^
   cc1: some warnings being treated as errors

vim +/__vfs_getxattr +187 fs/overlayfs/overlayfs.h

   181	
   182	static inline ssize_t ovl_do_getxattr(struct ovl_fs *ofs, struct dentry *dentry,
   183					      enum ovl_xattr ox, void *value,
   184					      size_t size)
   185	{
   186		const char *name = ovl_xattr(ofs, ox);
 > 187		return __vfs_getxattr(dentry, name, value, size, XATTR_NOSECURITY);
 > 188	}
   189	

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