diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2012-03-07 20:00:34 (GMT) |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2014-05-14 18:38:37 (GMT) |
| commit | 587c55f3b7e91d6b5059b6276b3c9c6789e514be (patch) | |
| tree | 333f48e8692f0fd37b3eae27b8335b416e656518 /fs/dcache.c | |
| parent | a473767a5b67bc7b0196a61e9e26aec5298c1928 (diff) | |
| download | linux-fsl-qoriq-587c55f3b7e91d6b5059b6276b3c9c6789e514be.tar.xz | |
fs: dcache: Use cpu_chill() in trylock loops
Retry loops on RT might loop forever when the modifying side was
preempted. Use cpu_chill() instead of cpu_relax() to let the system
make progress.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable-rt@vger.kernel.org
Diffstat (limited to 'fs/dcache.c')
| -rw-r--r-- | fs/dcache.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/dcache.c b/fs/dcache.c index 8ef74f3..2f9d6f3 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -19,6 +19,7 @@ #include <linux/mm.h> #include <linux/fs.h> #include <linux/fsnotify.h> +#include <linux/delay.h> #include <linux/slab.h> #include <linux/init.h> #include <linux/hash.h> @@ -554,7 +555,7 @@ dentry_kill(struct dentry *dentry, int unlock_on_failure) relock: if (unlock_on_failure) { spin_unlock(&dentry->d_lock); - cpu_relax(); + cpu_chill(); } return dentry; /* try again with same dentry */ } @@ -2391,7 +2392,7 @@ again: if (dentry->d_lockref.count == 1) { if (!spin_trylock(&inode->i_lock)) { spin_unlock(&dentry->d_lock); - cpu_relax(); + cpu_chill(); goto again; } dentry->d_flags &= ~DCACHE_CANT_MOUNT; |