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. 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>
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@ -61,6 +61,7 @@
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#include <linux/nsproxy.h>
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#include <linux/ptrace.h>
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#include <linux/sched/rt.h>
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#include <linux/freezer.h>
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#include <asm/futex.h>
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@ -1807,7 +1808,7 @@ static void futex_wait_queue_me(struct futex_hash_bucket *hb, struct futex_q *q,
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* is no timeout, or if it has yet to expire.
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*/
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if (!timeout || timeout->task)
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schedule();
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freezable_schedule();
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}
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__set_current_state(TASK_RUNNING);
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}
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