diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2012-03-07 20:00:34 (GMT) |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2015-02-13 22:20:54 (GMT) |
| commit | fae775f49cbca6660d77086c4eed1d2c77afcdb0 (patch) | |
| tree | 076cdd973f65d2e4c80f7a48b47de8cd6b39f914 /fs/autofs4 | |
| parent | fb89e9743e513d51e2ea43deb0451461c328435c (diff) | |
| download | linux-fsl-qoriq-fae775f49cbca6660d77086c4eed1d2c77afcdb0.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/autofs4')
| -rw-r--r-- | fs/autofs4/autofs_i.h | 1 | ||||
| -rw-r--r-- | fs/autofs4/expire.c | 2 |
2 files changed, 2 insertions, 1 deletions
diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h index 3f1128b..c2ed9c4 100644 --- a/fs/autofs4/autofs_i.h +++ b/fs/autofs4/autofs_i.h @@ -34,6 +34,7 @@ #include <linux/sched.h> #include <linux/mount.h> #include <linux/namei.h> +#include <linux/delay.h> #include <asm/current.h> #include <asm/uaccess.h> diff --git a/fs/autofs4/expire.c b/fs/autofs4/expire.c index d096316..b6c6a11 100644 --- a/fs/autofs4/expire.c +++ b/fs/autofs4/expire.c @@ -157,7 +157,7 @@ again: parent = p->d_parent; if (!spin_trylock(&parent->d_lock)) { spin_unlock(&p->d_lock); - cpu_relax(); + cpu_chill(); goto relock; } spin_unlock(&p->d_lock); |