oom: convert zone_scan_lock from mutex to spinlock

[linux-2.6-omap-h63xx.git] / mm / oom_kill.c

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 183a964ca61b0f01399851757110f09c4b434196..a64decb5b13fb3922e05a70559855dde685b57b4 100644 (file)
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -28,7 +28,7 @@
 
 int sysctl_panic_on_oom;
 int sysctl_oom_kill_allocating_task;
-static DEFINE_MUTEX(zone_scan_mutex);
+static DEFINE_SPINLOCK(zone_scan_mutex);
 /* #define DEBUG */
 
 /**
@@ -396,7 +396,7 @@ int try_set_zone_oom(struct zonelist *zonelist)
 
        z = zonelist->zones;
 
-       mutex_lock(&zone_scan_mutex);
+       spin_lock(&zone_scan_mutex);
        do {
                if (zone_is_oom_locked(*z)) {
                        ret = 0;
@@ -413,7 +413,7 @@ int try_set_zone_oom(struct zonelist *zonelist)
                zone_set_flag(*z, ZONE_OOM_LOCKED);
        } while (*(++z) != NULL);
 out:
-       mutex_unlock(&zone_scan_mutex);
+       spin_unlock(&zone_scan_mutex);
        return ret;
 }
 
@@ -428,11 +428,11 @@ void clear_zonelist_oom(struct zonelist *zonelist)
 
        z = zonelist->zones;
 
-       mutex_lock(&zone_scan_mutex);
+       spin_lock(&zone_scan_mutex);
        do {
                zone_clear_flag(*z, ZONE_OOM_LOCKED);
        } while (*(++z) != NULL);
-       mutex_unlock(&zone_scan_mutex);
+       spin_unlock(&zone_scan_mutex);
 }
 
 /**