[PATCH v2] fs/dcache.c: avoid soft-lockup in dput()

[Wei Fang]

We triggered soft-lockup under stress test which
open/access/write/close one file concurrently on more than
five different CPUs:

WARN: soft lockup - CPU#0 stuck for 11s! [who:30631]
...
[<ffffffc0003986f8>] dput+0x100/0x298
[<ffffffc00038c2dc>] terminate_walk+0x4c/0x60
[<ffffffc00038f56c>] path_lookupat+0x5cc/0x7a8
[<ffffffc00038f780>] filename_lookup+0x38/0xf0
[<ffffffc000391180>] user_path_at_empty+0x78/0xd0
[<ffffffc0003911f4>] user_path_at+0x1c/0x28
[<ffffffc00037d4fc>] SyS_faccessat+0xb4/0x230

->d_lock trylock may failed many times because of concurrently
operations, and dput() may execute a long time.

Fix this by replacing cpu_relax() with cond_resched().
dput() used to be sleepable, so make it sleepable again
should be safe.

Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Wei Fang <fangwei1@xxxxxxxxxx>
---
Changes v1->v2:
- add might_sleep() to annotate that dput() can sleep

 fs/dcache.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/fs/dcache.c b/fs/dcache.c
index d5ecc6e..074fc1c 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -578,7 +578,7 @@ static struct dentry *dentry_kill(struct dentry *dentry)
 
 failed:
 	spin_unlock(&dentry->d_lock);
-	cpu_relax();
+	cond_resched();
 	return dentry; /* try again with same dentry */
 }
 
@@ -752,6 +752,8 @@ void dput(struct dentry *dentry)
 		return;
 
 repeat:
+	might_sleep();
+
 	rcu_read_lock();
 	if (likely(fast_dput(dentry))) {
 		rcu_read_unlock();
-- 
1.7.1