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| H A D | f2fs.h | diff c7f91bd4102902384137dd5c50d04bfed27050dd Tue Feb 22 12:43:13 CST 2022 Bart Van Assche <bvanassche@acm.org> f2fs: Restore rwsem lockdep support
Lockdep uses lock class keys in its analysis. init_rwsem() instantiates
one lock class key with each init_rwsem() user as follows:
#define init_rwsem(sem) \
do { \
static struct lock_class_key __key; \
\
__init_rwsem((sem), #sem, &__key); \
} while (0)
Commit e4544b63a7ee ("f2fs: move f2fs to use reader-unfair rwsems") reduced
the number of lock class keys from one per init_rwsem() user to one per
file in which init_f2fs_rwsem() is used. This causes the same lock class key
to be associated with multiple f2fs rwsems and also triggers a number of
false positive lockdep deadlock reports. Fix this by again instantiating one
lock class key with each init_f2fs_rwsem() caller.
Cc: Tim Murray <timmurray@google.com>
Reported-by: syzbot+0b9cadf5fc45a98a5083@syzkaller.appspotmail.com
Fixes: e4544b63a7ee ("f2fs: move f2fs to use reader-unfair rwsems")
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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