[arm-soc:to-build 4/4] include/linux/buffer_head.h:340:16: warning: 'bno' may be used uninitialized in this function
kbuild test robot
fengguang.wu at intel.com
Thu Oct 13 06:26:03 PDT 2016
tree: https://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc.git to-build
head: 346c22ea9cb8d0ee331c73529b205414e43a4655
commit: 346c22ea9cb8d0ee331c73529b205414e43a4655 [4/4] Revert "Disable "maybe-uninitialized" warning globally"
config: blackfin-BF526-EZBRD_defconfig (attached as .config)
compiler: bfin-uclinux-gcc (GCC) 6.2.0
reproduce:
wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
git checkout 346c22ea9cb8d0ee331c73529b205414e43a4655
# save the attached .config to linux build tree
make.cross ARCH=blackfin
Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings
All warnings (new ones prefixed by >>):
In file included from fs/ext2/inode.c:32:0:
fs/ext2/inode.c: In function 'ext2_get_block':
>> include/linux/buffer_head.h:340:16: warning: 'bno' may be used uninitialized in this function [-Wmaybe-uninitialized]
bh->b_blocknr = block;
~~~~~~~~~~~~~~^~~~~~~
fs/ext2/inode.c:783:6: note: 'bno' was declared here
u32 bno;
^~~
vim +/bno +340 include/linux/buffer_head.h
bd7ade3c Nikolay Borisov 2015-07-02 324 sb_getblk_gfp(struct super_block *sb, sector_t block, gfp_t gfp)
bd7ade3c Nikolay Borisov 2015-07-02 325 {
bd7ade3c Nikolay Borisov 2015-07-02 326 return __getblk_gfp(sb->s_bdev, block, sb->s_blocksize, gfp);
bd7ade3c Nikolay Borisov 2015-07-02 327 }
bd7ade3c Nikolay Borisov 2015-07-02 328
^1da177e Linus Torvalds 2005-04-16 329 static inline struct buffer_head *
^1da177e Linus Torvalds 2005-04-16 330 sb_find_get_block(struct super_block *sb, sector_t block)
^1da177e Linus Torvalds 2005-04-16 331 {
^1da177e Linus Torvalds 2005-04-16 332 return __find_get_block(sb->s_bdev, block, sb->s_blocksize);
^1da177e Linus Torvalds 2005-04-16 333 }
^1da177e Linus Torvalds 2005-04-16 334
^1da177e Linus Torvalds 2005-04-16 335 static inline void
^1da177e Linus Torvalds 2005-04-16 336 map_bh(struct buffer_head *bh, struct super_block *sb, sector_t block)
^1da177e Linus Torvalds 2005-04-16 337 {
^1da177e Linus Torvalds 2005-04-16 338 set_buffer_mapped(bh);
^1da177e Linus Torvalds 2005-04-16 339 bh->b_bdev = sb->s_bdev;
^1da177e Linus Torvalds 2005-04-16 @340 bh->b_blocknr = block;
b0cf2321 Badari Pulavarty 2006-03-26 341 bh->b_size = sb->s_blocksize;
^1da177e Linus Torvalds 2005-04-16 342 }
^1da177e Linus Torvalds 2005-04-16 343
^1da177e Linus Torvalds 2005-04-16 344 static inline void wait_on_buffer(struct buffer_head *bh)
^1da177e Linus Torvalds 2005-04-16 345 {
^1da177e Linus Torvalds 2005-04-16 346 might_sleep();
a9877cc2 Richard Kennedy 2010-08-09 347 if (buffer_locked(bh))
^1da177e Linus Torvalds 2005-04-16 348 __wait_on_buffer(bh);
:::::: The code at line 340 was first introduced by commit
:::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2
:::::: TO: Linus Torvalds <torvalds at ppc970.osdl.org>
:::::: CC: Linus Torvalds <torvalds at ppc970.osdl.org>
---
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