Hi Anand,

[auto build test WARNING on btrfs/next]
[cannot apply to v4.8-rc6 next-20160913]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
[Suggest to use git(>=2.9.0) format-patch --base=<commit> (or --base=auto for convenience) to record what (public, well-known) commit your patch series was built on]
[Check https://git-scm.com/docs/git-format-patch for more information]

url:    https://github.com/0day-ci/linux/commits/Anand-Jain/btrfs-Encryption-Add-btrfs-encryption-support/20160913-214237
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs.git next
config: i386-randconfig-x009-201637 (attached as .config)
compiler: gcc-6 (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   In file included from include/linux/printk.h:6:0,
                    from include/linux/kernel.h:13,
                    from include/linux/list.h:8,
                    from include/linux/hashtable.h:9,
                    from fs/btrfs/props.c:19:
   fs/btrfs/props.c: In function '__btrfs_set_prop':
   include/linux/kern_levels.h:4:18: warning: format '%lu' expects argument of type 'long unsigned int', but argument 5 has type 'size_t {aka unsigned int}' [-Wformat=]
    #define KERN_SOH "\001"  /* ASCII Start Of Header */
                     ^
   include/linux/kern_levels.h:10:18: note: in expansion of macro 'KERN_SOH'
    #define KERN_ERR KERN_SOH "3" /* error conditions */
                     ^~~~~~~~
   include/linux/printk.h:264:9: note: in expansion of macro 'KERN_ERR'
     printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
            ^~~~~~~~
>> fs/btrfs/props.c:177:3: note: in expansion of macro 'pr_err'
      pr_err("BTRFS: property apply failed %s %d %s %lu\n",
      ^~~~~~
   fs/btrfs/props.c: In function 'prop_encrypt_validate':
   include/linux/kern_levels.h:4:18: warning: format '%lu' expects argument of type 'long unsigned int', but argument 4 has type 'size_t {aka unsigned int}' [-Wformat=]
    #define KERN_SOH "\001"  /* ASCII Start Of Header */
                     ^
   include/linux/kern_levels.h:10:18: note: in expansion of macro 'KERN_SOH'
    #define KERN_ERR KERN_SOH "3" /* error conditions */
                     ^~~~~~~~
   include/linux/printk.h:264:9: note: in expansion of macro 'KERN_ERR'
     printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
            ^~~~~~~~
   fs/btrfs/props.c:567:3: note: in expansion of macro 'pr_err'
      pr_err("BTRFS: %lu mal formed value '%s' %lu\n",
      ^~~~~~
   fs/btrfs/props.c: In function 'prop_cryptoiv_apply':
   include/linux/kern_levels.h:4:18: warning: format '%lu' expects argument of type 'long unsigned int', but argument 4 has type 'size_t {aka unsigned int}' [-Wformat=]
    #define KERN_SOH "\001"  /* ASCII Start Of Header */
                     ^
   include/linux/kern_levels.h:10:18: note: in expansion of macro 'KERN_SOH'
    #define KERN_ERR KERN_SOH "3" /* error conditions */
                     ^~~~~~~~
   include/linux/printk.h:264:9: note: in expansion of macro 'KERN_ERR'
     printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
            ^~~~~~~~
   fs/btrfs/props.c:696:3: note: in expansion of macro 'pr_err'
      pr_err("BTRFS: %lu prop_cryptoiv_apply failed ret %d len %lu\n",
      ^~~~~~

vim +/pr_err +177 fs/btrfs/props.c

   161			ASSERT(ret == 0);
   162	
   163			return ret;
   164		}
   165	
   166		ret = handler->validate(inode, value, value_len);
   167		if (ret) {
   168			return ret;
   169		}
   170		ret = __btrfs_setxattr(trans, inode, handler->xattr_name,
   171				       value, value_len, flags);
   172		if (ret) {
   173			return ret;
   174		}
   175		ret = handler->apply(inode, value, value_len);
   176		if (ret && ret != -EKEYREJECTED) {
 > 177			pr_err("BTRFS: property apply failed %s %d %s %lu\n",
   178						name, ret, value, value_len);
   179			__btrfs_setxattr(trans, inode, handler->xattr_name,
   180					 NULL, 0, flags);
   181			return ret;
   182		}
   183	
   184		set_bit(BTRFS_INODE_HAS_PROPS, &BTRFS_I(inode)->runtime_flags);
   185	

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