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Message-ID: <202010091929.BdAjFoPr-lkp@intel.com>
Date: Fri, 9 Oct 2020 19:20:34 +0800
From: kernel test robot <lkp@...el.com>
To: Harshad Shirwadkar <harshadshirwadkar@...il.com>
Cc: kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
linux-ext4@...r.kernel.org, Theodore Ts'o <tytso@....edu>
Subject: [ext4:dev 11/44] fs/ext4/mballoc.c:5221:6: warning: no previous
prototype for function 'ext4_free_blocks_simple'
tree: https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git dev
head: ab7b179af3f98772f2433ddc4ace6b7924a4e862
commit: 090f311f4264ec136e6dcd19804eb9665230e67f [11/44] ext4: fast commit recovery path
config: x86_64-randconfig-a004-20201009 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 4cfc4025cc1433ca5ef1c526053fc9c4bfe64109)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install x86_64 cross compiling tool for clang build
# apt-get install binutils-x86-64-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?id=090f311f4264ec136e6dcd19804eb9665230e67f
git remote add ext4 https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git
git fetch --no-tags ext4 dev
git checkout 090f311f4264ec136e6dcd19804eb9665230e67f
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
All warnings (new ones prefixed by >>):
>> fs/ext4/mballoc.c:5221:6: warning: no previous prototype for function 'ext4_free_blocks_simple' [-Wmissing-prototypes]
void ext4_free_blocks_simple(struct inode *inode, ext4_fsblk_t block,
^
fs/ext4/mballoc.c:5221:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void ext4_free_blocks_simple(struct inode *inode, ext4_fsblk_t block,
^
static
1 warning generated.
--
fs/ext4/fast_commit.c:1091:6: warning: variable 'start_time' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
if (!test_opt2(sb, JOURNAL_FAST_COMMIT) ||
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fs/ext4/fast_commit.c:1147:51: note: uninitialized use occurs here
commit_time = ktime_to_ns(ktime_sub(ktime_get(), start_time));
^~~~~~~~~~
include/linux/ktime.h:47:39: note: expanded from macro 'ktime_sub'
#define ktime_sub(lhs, rhs) ((lhs) - (rhs))
^~~
fs/ext4/fast_commit.c:1091:2: note: remove the 'if' if its condition is always false
if (!test_opt2(sb, JOURNAL_FAST_COMMIT) ||
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fs/ext4/fast_commit.c:1091:6: warning: variable 'start_time' is used uninitialized whenever '||' condition is true [-Wsometimes-uninitialized]
if (!test_opt2(sb, JOURNAL_FAST_COMMIT) ||
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fs/ext4/fast_commit.c:1147:51: note: uninitialized use occurs here
commit_time = ktime_to_ns(ktime_sub(ktime_get(), start_time));
^~~~~~~~~~
include/linux/ktime.h:47:39: note: expanded from macro 'ktime_sub'
#define ktime_sub(lhs, rhs) ((lhs) - (rhs))
^~~
fs/ext4/fast_commit.c:1091:6: note: remove the '||' if its condition is always false
if (!test_opt2(sb, JOURNAL_FAST_COMMIT) ||
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fs/ext4/fast_commit.c:1087:20: note: initialize the variable 'start_time' to silence this warning
ktime_t start_time, commit_time;
^
= 0
>> fs/ext4/fast_commit.c:1787:6: warning: no previous prototype for function 'ext4_fc_set_bitmaps_and_counters' [-Wmissing-prototypes]
void ext4_fc_set_bitmaps_and_counters(struct super_block *sb)
^
fs/ext4/fast_commit.c:1787:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void ext4_fc_set_bitmaps_and_counters(struct super_block *sb)
^
static
3 warnings generated.
vim +/ext4_free_blocks_simple +5221 fs/ext4/mballoc.c
5220
> 5221 void ext4_free_blocks_simple(struct inode *inode, ext4_fsblk_t block,
5222 unsigned long count)
5223 {
5224 struct buffer_head *bitmap_bh;
5225 struct super_block *sb = inode->i_sb;
5226 struct ext4_group_desc *gdp;
5227 struct buffer_head *gdp_bh;
5228 ext4_group_t group;
5229 ext4_grpblk_t blkoff;
5230 int already_freed = 0, err, i;
5231
5232 ext4_get_group_no_and_offset(sb, block, &group, &blkoff);
5233 bitmap_bh = ext4_read_block_bitmap(sb, group);
5234 if (IS_ERR(bitmap_bh)) {
5235 err = PTR_ERR(bitmap_bh);
5236 pr_warn("Failed to read block bitmap\n");
5237 return;
5238 }
5239 gdp = ext4_get_group_desc(sb, group, &gdp_bh);
5240 if (!gdp)
5241 return;
5242
5243 for (i = 0; i < count; i++) {
5244 if (!mb_test_bit(blkoff + i, bitmap_bh->b_data))
5245 already_freed++;
5246 }
5247 mb_clear_bits(bitmap_bh->b_data, blkoff, count);
5248 err = ext4_handle_dirty_metadata(NULL, NULL, bitmap_bh);
5249 if (err)
5250 return;
5251 ext4_free_group_clusters_set(
5252 sb, gdp, ext4_free_group_clusters(sb, gdp) +
5253 count - already_freed);
5254 ext4_block_bitmap_csum_set(sb, group, gdp, bitmap_bh);
5255 ext4_group_desc_csum_set(sb, group, gdp);
5256 ext4_handle_dirty_metadata(NULL, NULL, gdp_bh);
5257 sync_dirty_buffer(bitmap_bh);
5258 sync_dirty_buffer(gdp_bh);
5259 brelse(bitmap_bh);
5260 }
5261
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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