Hi,
在 2023/06/14 20:32, kernel test robot 写道:
tree: git://git.kernel.org/pub/scm/linux/kernel/git/song/md.git md-next
head: 460af1f9d9e62acce4a21f9bd00b5bcd5963bcd4
commit: 8295efbe68c080047e98d9c0eb5cb933b238a8cb [25/29] md/raid1-10: factor out a helper to submit normal write
config: arm-randconfig-r026-20230612 (https://download.01.org/0day-ci/archive/20230614/202306142042.fmjfmTF8-lkp@xxxxxxxxx/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce (this is a W=1 build):
mkdir -p ~/bin
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install arm cross compiling tool for clang build
# apt-get install binutils-arm-linux-gnueabi
# https://git.kernel.org/pub/scm/linux/kernel/git/song/md.git/commit/?id=8295efbe68c080047e98d9c0eb5cb933b238a8cb
git remote add song-md git://git.kernel.org/pub/scm/linux/kernel/git/song/md.git
git fetch --no-tags song-md md-next
git checkout 8295efbe68c080047e98d9c0eb5cb933b238a8cb
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=arm olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/
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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202306142042.fmjfmTF8-lkp@xxxxxxxxx/
All errors (new ones prefixed by >>):
In file included from drivers/md/raid10.c:80:
drivers/md/raid1-10.c:117:25: error: casting from randomized structure pointer type 'struct block_device *' to 'struct md_rdev *'
117 | struct md_rdev *rdev = (struct md_rdev *)bio->bi_bdev;
I didn't hit this warning with W=1 in my local machine, so I guess this
might related to compiler. I'm using gcc (GCC) 12.2.1 and here is clang
version 17.0.0.
I'm planning to get rid of all these weird usage, which is used a lot in
raid, to borrow a field to store something else temporarily, but this
might take sometime.
Can someone help to confirm following change can prevent this warning?
struct md_rdev *rdev = (void *)bio->bi_bdev
Thanks,
Kuai
| ^
1 error generated.
vim +117 drivers/md/raid1-10.c
113
114
115 static inline void raid1_submit_write(struct bio *bio)
116 {
> 117 struct md_rdev *rdev = (struct md_rdev *)bio->bi_bdev;
118
119 bio->bi_next = NULL;
120 bio_set_dev(bio, rdev->bdev);
121 if (test_bit(Faulty, &rdev->flags))
122 bio_io_error(bio);
123 else if (unlikely(bio_op(bio) == REQ_OP_DISCARD &&
124 !bdev_max_discard_sectors(bio->bi_bdev)))
125 /* Just ignore it */
126 bio_endio(bio);
127 else
128 submit_bio_noacct(bio);
129 }
130
