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author | Yang Shi <yang.shi@linaro.org> | 2016-02-26 16:25:25 -0800 |
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committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2016-03-02 10:22:14 -0800 |
commit | 59692b7c71e4271b62bddce5bfd50b9e805a4a02 (patch) | |
tree | 7b1a508e6ec0d9a44b1b494eddc25070faf28378 /fs/fscache/cookie.c | |
parent | 8c2b1435b9f48904aaa9401d12b800ca8c4dae05 (diff) | |
download | linux-59692b7c71e4271b62bddce5bfd50b9e805a4a02.tar.gz linux-59692b7c71e4271b62bddce5bfd50b9e805a4a02.tar.bz2 linux-59692b7c71e4271b62bddce5bfd50b9e805a4a02.zip |
f2fs: mutex can't be used by down_write_nest_lock()
f2fs_lock_all() calls down_write_nest_lock() to acquire a rw_sem and check
a mutex, but down_write_nest_lock() is designed for two rw_sem accoring to the
comment in include/linux/rwsem.h. And, other than f2fs, it is just called in
mm/mmap.c with two rwsem.
So, it looks it is used wrongly by f2fs. And, it causes the below compile
warning on -rt kernel too.
In file included from fs/f2fs/xattr.c:25:0:
fs/f2fs/f2fs.h: In function 'f2fs_lock_all':
fs/f2fs/f2fs.h:962:34: warning: passing argument 2 of 'down_write_nest_lock' from incompatible pointer type [-Wincompatible-pointer-types]
f2fs_down_write(&sbi->cp_rwsem, &sbi->cp_mutex);
^
fs/f2fs/f2fs.h:27:55: note: in definition of macro 'f2fs_down_write'
#define f2fs_down_write(x, y) down_write_nest_lock(x, y)
^
In file included from include/linux/rwsem.h:22:0,
from fs/f2fs/xattr.c:21:
include/linux/rwsem_rt.h:138:20: note: expected 'struct rw_semaphore *' but argument is of type 'struct mutex *'
static inline void down_write_nest_lock(struct rw_semaphore *sem,
Signed-off-by: Yang Shi <yang.shi@linaro.org>
Reviewed-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/fscache/cookie.c')
0 files changed, 0 insertions, 0 deletions