Re: [PATCH] z3fold: don't fail kernel build if z3fold_header is too big

[kbuild test robot]

Hi Vitaly,

[auto build test WARNING on mmotm/master]
[also build test WARNING on v4.9-rc4 next-20161110]
[if your patch is applied to the wrong git tree, please drop us a note to help 
improve the system]

url:    
https://github.com/0day-ci/linux/commits/Vitaly-Wool/z3fold-don-t-fail-kernel-build-if-z3fold_header-is-too-big/20161110-161657
base:   git://git.cmpxchg.org/linux-mmotm.git master
config: x86_64-randconfig-x014-201645 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

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 mm/z3fold.c:26:
   mm/z3fold.c: In function 'init_z3fold':
   include/linux/kern_levels.h:4:18: warning: format '%d' expects argument of 
type 'int', but argument 2 has type 'long 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:277:9: note: in expansion of macro 'KERN_ERR'
     printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
            ^~~~~~~~
>> mm/z3fold.c:817:3: note: in expansion of macro 'pr_err'
      pr_err("z3fold: z3fold_header size (%d) is bigger than "
      ^~~~~~

vim +/pr_err +817 mm/z3fold.c

   801          .create =       z3fold_zpool_create,
   802          .destroy =      z3fold_zpool_destroy,
   803          .malloc =       z3fold_zpool_malloc,
   804          .free =         z3fold_zpool_free,
   805          .shrink =       z3fold_zpool_shrink,
   806          .map =          z3fold_zpool_map,
   807          .unmap =        z3fold_zpool_unmap,
   808          .total_size =   z3fold_zpool_total_size,
   809  };
   810  
   811  MODULE_ALIAS("zpool-z3fold");
   812  
   813  static int __init init_z3fold(void)
   814  {
   815          /* Fail the initialization if z3fold header won't fit in one 
chunk */
   816          if (sizeof(struct z3fold_header) > ZHDR_SIZE_ALIGNED) {
 > 817                  pr_err("z3fold: z3fold_header size (%d) is bigger than "
   818                          "the chunk size (%d), can't proceed\n",
   819                          sizeof(struct z3fold_header) , 
ZHDR_SIZE_ALIGNED);
   820                  return -E2BIG;
   821          }
   822  
   823          zpool_register_driver(&z3fold_zpool_driver);
   824          return 0;
   825  }

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