On 12/13/18 8:38 PM, Waiman Long wrote: > Using down_read_trylock() to check if a task holds a write lock on > a rwsem is not reliable. A task can hold a read lock on a rwsem and > down_read_trylock() can fail if a writer is waiting in the wait queue. > > So use lockdep_assert_held_exclusive() instead which can do the right > check when CONFIG_LOCKDEP is on. > > Signed-off-by: Waiman Long <longman@xxxxxxxxxx> There's already a patch in mmotm removing this completely: https://www.ozlabs.org/~akpm/mmots/broken-out/mm-mmap-remove-verify_mm_writelocked.patch Vlastimil
