4.17-stable review patch. If anyone has any objections, please let me know.
------------------ From: Waiman Long <[email protected]> commit 03eeafdd9ab06a770d42c2b264d50dff7e2f4eee upstream. It was found that the use of up_read_non_owner() in NFS was causing the following warning when DEBUG_RWSEMS was configured. DEBUG_LOCKS_WARN_ON(sem->owner != ((struct task_struct *)(1UL << 0))) Looking into the rwsem.c file, it was discovered that the corresponding down_read_non_owner() function was not setting the owner field properly. This is fixed now, and the warning should be gone. Fixes: 5149cbac4235 ("locking/rwsem: Add DEBUG_RWSEMS to look for lock/unlock mismatches") Signed-off-by: Waiman Long <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Acked-by: Peter Zijlstra (Intel) <[email protected]> Tested-by: Gavin Schenk <[email protected]> Cc: Davidlohr Bueso <[email protected]> Cc: Dan Williams <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: [email protected] Cc: [email protected] Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Greg Kroah-Hartman <[email protected]> --- kernel/locking/rwsem.c | 1 + 1 file changed, 1 insertion(+) --- a/kernel/locking/rwsem.c +++ b/kernel/locking/rwsem.c @@ -181,6 +181,7 @@ void down_read_non_owner(struct rw_semap might_sleep(); __down_read(sem); + rwsem_set_reader_owned(sem); } EXPORT_SYMBOL(down_read_non_owner);
