Re: [PATCH v2 18/19] ext4: add some kunit stub for mballoc kunit test

From: kernel test robot
Date: Wed Apr 12 2023 - 14:17:34 EST

Hi Kemeng,

kernel test robot noticed the following build warnings:

[auto build test WARNING on tytso-ext4/dev]
[also build test WARNING on next-20230412]
[cannot apply to linus/master v6.3-rc6]
[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/Kemeng-Shi/ext4-fix-wrong-unit-use-in-ext4_mb_normalize_request/20230412-172757
base: https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git dev
patch link: https://lore.kernel.org/r/20230412172833.2317696-19-shikemeng%40huaweicloud.com
patch subject: [PATCH v2 18/19] ext4: add some kunit stub for mballoc kunit test
config: powerpc-randconfig-r006-20230409 (https://download.01.org/0day-ci/archive/20230413/202304130244.S0jqbqkn-lkp@xxxxxxxxx/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project 2c57868e2e877f73c339796c3374ae660bb77f0d)
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 powerpc cross compiling tool for clang build
# apt-get install binutils-powerpc-linux-gnu
# https://github.com/intel-lab-lkp/linux/commit/357d528a1ead868fa038c4bfe426744ac7c34ea6
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Kemeng-Shi/ext4-fix-wrong-unit-use-in-ext4_mb_normalize_request/20230412-172757
git checkout 357d528a1ead868fa038c4bfe426744ac7c34ea6
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=powerpc olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash fs/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Link: https://lore.kernel.org/oe-kbuild-all/202304130244.S0jqbqkn-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> fs/ext4/balloc.c:275:15: warning: mixing declarations and code is incompatible with standards before C99 [-Wdeclaration-after-statement]
unsigned int group_desc;
^
fs/ext4/balloc.c:435:26: warning: mixing declarations and code is incompatible with standards before C99 [-Wdeclaration-after-statement]
struct ext4_group_desc *desc;
^
fs/ext4/balloc.c:538:26: warning: mixing declarations and code is incompatible with standards before C99 [-Wdeclaration-after-statement]
struct ext4_group_desc *desc;
^
3 warnings generated.
--
>> fs/ext4/mballoc.c:3752:12: warning: mixing declarations and code is incompatible with standards before C99 [-Wdeclaration-after-statement]
handle_t *handle = mc->handle;
^
1 warning generated.


vim +275 fs/ext4/balloc.c

717d50e4971b81 Andreas Dilger 2007-10-16 248
ac27a0ec112a08 Dave Kleikamp 2006-10-11 249 /*
ac27a0ec112a08 Dave Kleikamp 2006-10-11 250 * The free blocks are managed by bitmaps. A file system contains several
ac27a0ec112a08 Dave Kleikamp 2006-10-11 251 * blocks groups. Each group contains 1 bitmap block for blocks, 1 bitmap
ac27a0ec112a08 Dave Kleikamp 2006-10-11 252 * block for inodes, N blocks for the inode table and data blocks.
ac27a0ec112a08 Dave Kleikamp 2006-10-11 253 *
ac27a0ec112a08 Dave Kleikamp 2006-10-11 254 * The file system contains group descriptors which are located after the
ac27a0ec112a08 Dave Kleikamp 2006-10-11 255 * super block. Each descriptor contains the number of the bitmap block and
ac27a0ec112a08 Dave Kleikamp 2006-10-11 256 * the free blocks count in the block. The descriptors are loaded in memory
e627432c2948d5 Aneesh Kumar K.V 2007-02-20 257 * when a file system is mounted (see ext4_fill_super).
ac27a0ec112a08 Dave Kleikamp 2006-10-11 258 */
ac27a0ec112a08 Dave Kleikamp 2006-10-11 259
ac27a0ec112a08 Dave Kleikamp 2006-10-11 260 /**
617ba13b31fbf5 Mingming Cao 2006-10-11 261 * ext4_get_group_desc() -- load group descriptor from disk
ac27a0ec112a08 Dave Kleikamp 2006-10-11 262 * @sb: super block
ac27a0ec112a08 Dave Kleikamp 2006-10-11 263 * @block_group: given block group
ac27a0ec112a08 Dave Kleikamp 2006-10-11 264 * @bh: pointer to the buffer head to store the block
ac27a0ec112a08 Dave Kleikamp 2006-10-11 265 * group descriptor
ac27a0ec112a08 Dave Kleikamp 2006-10-11 266 */
617ba13b31fbf5 Mingming Cao 2006-10-11 267 struct ext4_group_desc * ext4_get_group_desc(struct super_block *sb,
fd2d42912f9f09 Avantika Mathur 2008-01-28 268 ext4_group_t block_group,
ac27a0ec112a08 Dave Kleikamp 2006-10-11 269 struct buffer_head **bh)
ac27a0ec112a08 Dave Kleikamp 2006-10-11 270 {
357d528a1ead86 Kemeng Shi 2023-04-13 271 #ifdef CONFIG_EXT4_KUNIT_TESTS
357d528a1ead86 Kemeng Shi 2023-04-13 272 KUNIT_STATIC_STUB_REDIRECT(ext4_get_group_desc,
357d528a1ead86 Kemeng Shi 2023-04-13 273 sb, block_group, bh);
357d528a1ead86 Kemeng Shi 2023-04-13 274 #endif
498e5f24158da7 Theodore Ts'o 2008-11-05 @275 unsigned int group_desc;
498e5f24158da7 Theodore Ts'o 2008-11-05 276 unsigned int offset;
8df9675f8b498d Theodore Ts'o 2009-05-01 277 ext4_group_t ngroups = ext4_get_groups_count(sb);
617ba13b31fbf5 Mingming Cao 2006-10-11 278 struct ext4_group_desc *desc;
617ba13b31fbf5 Mingming Cao 2006-10-11 279 struct ext4_sb_info *sbi = EXT4_SB(sb);
1d0c3924a92e69 Theodore Ts'o 2020-02-15 280 struct buffer_head *bh_p;
ac27a0ec112a08 Dave Kleikamp 2006-10-11 281
8df9675f8b498d Theodore Ts'o 2009-05-01 282 if (block_group >= ngroups) {
12062dddda4509 Eric Sandeen 2010-02-15 283 ext4_error(sb, "block_group >= groups_count - block_group = %u,"
12062dddda4509 Eric Sandeen 2010-02-15 284 " groups_count = %u", block_group, ngroups);
ac27a0ec112a08 Dave Kleikamp 2006-10-11 285
ac27a0ec112a08 Dave Kleikamp 2006-10-11 286 return NULL;
ac27a0ec112a08 Dave Kleikamp 2006-10-11 287 }
ac27a0ec112a08 Dave Kleikamp 2006-10-11 288
617ba13b31fbf5 Mingming Cao 2006-10-11 289 group_desc = block_group >> EXT4_DESC_PER_BLOCK_BITS(sb);
617ba13b31fbf5 Mingming Cao 2006-10-11 290 offset = block_group & (EXT4_DESC_PER_BLOCK(sb) - 1);
1d0c3924a92e69 Theodore Ts'o 2020-02-15 291 bh_p = sbi_array_rcu_deref(sbi, s_group_desc, group_desc);
1d0c3924a92e69 Theodore Ts'o 2020-02-15 292 /*
1d0c3924a92e69 Theodore Ts'o 2020-02-15 293 * sbi_array_rcu_deref returns with rcu unlocked, this is ok since
1d0c3924a92e69 Theodore Ts'o 2020-02-15 294 * the pointer being dereferenced won't be dereferenced again. By
1d0c3924a92e69 Theodore Ts'o 2020-02-15 295 * looking at the usage in add_new_gdb() the value isn't modified,
1d0c3924a92e69 Theodore Ts'o 2020-02-15 296 * just the pointer, and so it remains valid.
1d0c3924a92e69 Theodore Ts'o 2020-02-15 297 */
1d0c3924a92e69 Theodore Ts'o 2020-02-15 298 if (!bh_p) {
12062dddda4509 Eric Sandeen 2010-02-15 299 ext4_error(sb, "Group descriptor not loaded - "
498e5f24158da7 Theodore Ts'o 2008-11-05 300 "block_group = %u, group_desc = %u, desc = %u",
ac27a0ec112a08 Dave Kleikamp 2006-10-11 301 block_group, group_desc, offset);
ac27a0ec112a08 Dave Kleikamp 2006-10-11 302 return NULL;
ac27a0ec112a08 Dave Kleikamp 2006-10-11 303 }
ac27a0ec112a08 Dave Kleikamp 2006-10-11 304
0d1ee42f27d30e Alexandre Ratchov 2006-10-11 305 desc = (struct ext4_group_desc *)(
1d0c3924a92e69 Theodore Ts'o 2020-02-15 306 (__u8 *)bh_p->b_data +
0d1ee42f27d30e Alexandre Ratchov 2006-10-11 307 offset * EXT4_DESC_SIZE(sb));
ac27a0ec112a08 Dave Kleikamp 2006-10-11 308 if (bh)
1d0c3924a92e69 Theodore Ts'o 2020-02-15 309 *bh = bh_p;
0d1ee42f27d30e Alexandre Ratchov 2006-10-11 310 return desc;
ac27a0ec112a08 Dave Kleikamp 2006-10-11 311 }
ac27a0ec112a08 Dave Kleikamp 2006-10-11 312

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