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

From: kbuild test robot
Date: Thu Nov 10 2016 - 04:04:56 EST


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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