From: Nikolay Borisov Date: Wed, 14 Feb 2018 12:37:26 +0000 (+0200) Subject: btrfs: Relax memory barrier in btrfs_tree_unlock X-Git-Tag: v4.19~990^2~107 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=2e32ef87b074cb8098436634b649b4b2b523acbe;p=platform%2Fkernel%2Flinux-rpi.git btrfs: Relax memory barrier in btrfs_tree_unlock When performing an unlock on an extent buffer we'd like to order the decrement of extent_buffer::blocking_writers with waking up any waiters. In such situations it's sufficient to use smp_mb__after_atomic rather than the heavy smp_mb. On architectures where atomic operations are fully ordered (such as x86 or s390) unconditionally executing a heavyweight smp_mb instruction causes a severe hit to performance while bringin no improvements in terms of correctness. The better thing is to use the appropriate smp_mb__after_atomic routine which will do the correct thing (invoke a full smp_mb or in the case of ordered atomics insert a compiler barrier). Put another way, an RMW atomic op + smp_load__after_atomic equals, in terms of semantics, to a full smp_mb. This ensures that none of the problems described in the accompanying comment of waitqueue_active occur. No functional changes. Signed-off-by: Nikolay Borisov Reviewed-by: David Sterba Signed-off-by: David Sterba --- diff --git a/fs/btrfs/locking.c b/fs/btrfs/locking.c index d13128c..621083f 100644 --- a/fs/btrfs/locking.c +++ b/fs/btrfs/locking.c @@ -290,7 +290,7 @@ void btrfs_tree_unlock(struct extent_buffer *eb) /* * Make sure counter is updated before we wake up waiters. */ - smp_mb(); + smp_mb__after_atomic(); if (waitqueue_active(&eb->write_lock_wq)) wake_up(&eb->write_lock_wq); } else {