linux-ext4 - Re: [PATCH] fs: ext4: fix uninitialized symbols

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Message-ID: <202510110215.0tTIOF83-lkp@intel.com>
Date: Sat, 11 Oct 2025 02:31:02 +0800
From: kernel test robot <lkp@...el.com>
To: Ranganath V N <vnranganath.20@...il.com>, tytso@....edu,
	adilger.kernel@...ger.ca
Cc: oe-kbuild-all@...ts.linux.dev, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-kernel-mentees@...ts.linuxfoundation.org,
	skhan@...uxfoundation.org, david.hunter.linux@...il.com,
	khalid@...nel.org, Ranganath V N <vnranganath.20@...il.com>
Subject: Re: [PATCH] fs: ext4: fix uninitialized symbols

Hi Ranganath,

kernel test robot noticed the following build warnings:

[auto build test WARNING on tytso-ext4/dev]
[also build test WARNING on linus/master v6.17 next-20251010]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Ranganath-V-N/fs-ext4-fix-uninitialized-symbols/20251010-065232
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git dev
patch link:    https://lore.kernel.org/r/20251008171614.12129-1-vnranganath.20%40gmail.com
patch subject: [PATCH] fs: ext4: fix uninitialized symbols
config: sparc-randconfig-002-20251010 (https://download.01.org/0day-ci/archive/20251011/202510110215.0tTIOF83-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251011/202510110215.0tTIOF83-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202510110215.0tTIOF83-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/uapi/linux/posix_types.h:5,
                    from include/uapi/linux/types.h:14,
                    from include/linux/types.h:6,
                    from include/linux/kasan-checks.h:5,
                    from include/asm-generic/rwonce.h:26,
                    from ./arch/sparc/include/generated/asm/rwonce.h:1,
                    from include/linux/compiler.h:382,
                    from arch/sparc/include/asm/bug.h:6,
                    from include/linux/bug.h:5,
                    from include/linux/vfsdebug.h:5,
                    from include/linux/fs.h:5,
                    from fs/ext4/inode.c:22:
   fs/ext4/inode.c: In function 'ext4_map_blocks_atomic_write_slow':
>> include/linux/stddef.h:8:14: warning: initialization of 'ext4_fsblk_t' {aka 'long long unsigned int'} from 'void *' makes integer from pointer without a cast [-Wint-conversion]
    #define NULL ((void *)0)
                 ^
   fs/ext4/inode.c:3547:27: note: in expansion of macro 'NULL'
     ext4_fsblk_t next_pblk = NULL;
                              ^~~~
--
   In file included from include/uapi/linux/posix_types.h:5,
                    from include/uapi/linux/types.h:14,
                    from include/linux/types.h:6,
                    from include/linux/kasan-checks.h:5,
                    from include/asm-generic/rwonce.h:26,
                    from arch/sparc/include/generated/asm/rwonce.h:1,
                    from include/linux/compiler.h:382,
                    from arch/sparc/include/asm/bug.h:6,
                    from include/linux/bug.h:5,
                    from include/linux/vfsdebug.h:5,
                    from include/linux/fs.h:5,
                    from inode.c:22:
   inode.c: In function 'ext4_map_blocks_atomic_write_slow':
>> include/linux/stddef.h:8:14: warning: initialization of 'ext4_fsblk_t' {aka 'long long unsigned int'} from 'void *' makes integer from pointer without a cast [-Wint-conversion]
    #define NULL ((void *)0)
                 ^
   inode.c:3547:27: note: in expansion of macro 'NULL'
     ext4_fsblk_t next_pblk = NULL;
                              ^~~~


vim +8 include/linux/stddef.h

^1da177e4c3f41 Linus Torvalds   2005-04-16  6  
^1da177e4c3f41 Linus Torvalds   2005-04-16  7  #undef NULL
^1da177e4c3f41 Linus Torvalds   2005-04-16 @8  #define NULL ((void *)0)
6e218287432472 Richard Knutsson 2006-09-30  9  

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki