Subject: + watchdog-update-watchdog-attributes-atomically.patch added to -mm tree
To: mhocko@xxxxxxx,dzickus@xxxxxxxxxx,fweisbec@xxxxxxxxx,mingo@xxxxxxxxxx,tglx@xxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Mon, 29 Jul 2013 14:04:28 -0700
The patch titled
Subject: watchdog: update watchdog attributes atomically
has been added to the -mm tree. Its filename is
watchdog-update-watchdog-attributes-atomically.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/watchdog-update-watchdog-attributes-atomically.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/watchdog-update-watchdog-attributes-atomically.patch
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From: Michal Hocko <mhocko@xxxxxxx>
Subject: watchdog: update watchdog attributes atomically
proc_dowatchdog doesn't synchronize multiple callers which might lead to
confusion when two parallel callers might confuse watchdog_enable_all_cpus
resp. watchdog_disable_all_cpus (e.g. watchdog gets enabled even if
watchdog_thresh was set to 0 already).
This patch adds a local mutex which synchronizes callers to the sysctl
handler.
Signed-off-by: Michal Hocko <mhocko@xxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Acked-by: Don Zickus <dzickus@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/watchdog.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff -puN kernel/watchdog.c~watchdog-update-watchdog-attributes-atomically kernel/watchdog.c
--- a/kernel/watchdog.c~watchdog-update-watchdog-attributes-atomically
+++ a/kernel/watchdog.c
@@ -520,13 +520,15 @@ int proc_dowatchdog(struct ctl_table *ta
void __user *buffer, size_t *lenp, loff_t *ppos)
{
int err, old_thresh, old_enabled;
+ static DEFINE_MUTEX(watchdog_proc_mutex);
+ mutex_lock(&watchdog_proc_mutex);
old_thresh = ACCESS_ONCE(watchdog_thresh);
old_enabled = ACCESS_ONCE(watchdog_user_enabled);
err = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
if (err || !write)
- return err;
+ goto out;
set_sample_period();
/*
@@ -544,7 +546,8 @@ int proc_dowatchdog(struct ctl_table *ta
watchdog_thresh = old_thresh;
watchdog_user_enabled = old_enabled;
}
-
+out:
+ mutex_unlock(&watchdog_proc_mutex);
return err;
}
#endif /* CONFIG_SYSCTL */
_
Patches currently in -mm which might be from mhocko@xxxxxxx are
vmpressure-change-vmpressure-sr_lock-to-spinlock.patch
vmpressure-do-not-check-for-pending-work-to-prevent-from-new-work.patch
vmpressure-make-sure-there-are-no-events-queued-after-memcg-is-offlined.patch
vmpressure-make-sure-there-are-no-events-queued-after-memcg-is-offlined-checkpatch-fixes.patch
include-linux-schedh-dont-use-task-pid-tgid-in-same_thread_group-has_group_leader_pid.patch
watchdog-update-watchdog-attributes-atomically.patch
watchdog-update-watchdog_tresh-properly.patch
mm-fix-potential-null-pointer-dereference.patch
inode-convert-inode-lru-list-to-generic-lru-list-code-inode-move-inode-to-a-different-list-inside-lock.patch
list_lru-per-node-list-infrastructure-fix-broken-lru_retry-behaviour.patch
list_lru-remove-special-case-function-list_lru_dispose_all.patch
xfs-convert-dquot-cache-lru-to-list_lru-fix-dquot-isolation-hang.patch
list_lru-dynamically-adjust-node-arrays-super-fix-for-destroy-lrus.patch
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