linux-kernel - [PATCH] NFS: Use smp_mb__{before,after}

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Date:	Fri, 30 May 2014 11:06:55 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Trond Myklebust <trond.myklebust@...marydata.com>
Cc:	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] NFS: Use smp_mb__{before,after}_atomic()

From: Thierry Reding <treding@...dia.com>

Commit febdbfe8a91c (arch: Prepare for smp_mb__{before,after}_atomic())
deprecated the smp_mb__{before,after}_{atomic,clear}_{dec,inc,bit}*()
functions in favour of the unified smp_mb__{before,after}_atomic().

While at it, convert the smb_mb__before_atomic()/clear_bit() pattern to
the more idiomatic clear_bit_unlock().

Signed-off-by: Thierry Reding <treding@...dia.com>
---
 fs/nfs/pagelist.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index 353331969626..c00d4f1de8ef 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -173,9 +173,8 @@ nfs_page_group_unlock(struct nfs_page *req)
 
 	WARN_ON_ONCE(head != head->wb_head);
 
-	smp_mb__before_clear_bit();
-	clear_bit(PG_HEADLOCK, &head->wb_flags);
-	smp_mb__after_clear_bit();
+	clear_bit_unlock(PG_HEADLOCK, &head->wb_flags);
+	smp_mb__after_atomic();
 	wake_up_bit(&head->wb_flags, PG_HEADLOCK);
 }
 
-- 
1.9.2

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