diff options
authorColin Cross <ccross@android.com>2013-05-06 23:50:18 +0000
committerArve Hjønnevåg <arve@android.com>2013-07-01 15:46:16 -0700
commit5ccf7dfeea5b5e2e63a6d45e85335c788a69e7b2 (patch)
parent947377f9be3f730f91a27d068225ba00db760ccd (diff)
futex: use freezable blocking call
Avoid waking up every thread sleeping in a futex_wait call during suspend and resume by calling a freezable blocking call. Previous patches modified the freezer to avoid sending wakeups to threads that are blocked in freezable blocking calls. This call was selected to be converted to a freezable call because it doesn't hold any locks or release any resources when interrupted that might be needed by another freezing task or a kernel driver during suspend, and is a common site where idle userspace tasks are blocked. Change-Id: I9ccab9c2d201adb66c85432801cdcf43fc91e94f Acked-by: Tejun Heo <tj@kernel.org> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Darren Hart <dvhart@linux.intel.com> Signed-off-by: Colin Cross <ccross@android.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/futex.c b/kernel/futex.c
index b26dcfc02c9..d710fae8abb 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -61,6 +61,7 @@
#include <linux/nsproxy.h>
#include <linux/ptrace.h>
#include <linux/sched/rt.h>
+#include <linux/freezer.h>
#include <asm/futex.h>
@@ -1807,7 +1808,7 @@ static void futex_wait_queue_me(struct futex_hash_bucket *hb, struct futex_q *q,
* is no timeout, or if it has yet to expire.
if (!timeout || timeout->task)
- schedule();
+ freezable_schedule();