select: use freezable blocking call
Avoid waking up every thread sleeping in a select 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> Signed-off-by: Colin Cross <ccross@android.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -27,6 +27,7 @@
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#include <linux/rcupdate.h>
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#include <linux/hrtimer.h>
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#include <linux/sched/rt.h>
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#include <linux/freezer.h>
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#include <asm/uaccess.h>
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@ -236,7 +237,8 @@ int poll_schedule_timeout(struct poll_wqueues *pwq, int state,
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set_current_state(state);
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if (!pwq->triggered)
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rc = schedule_hrtimeout_range(expires, slack, HRTIMER_MODE_ABS);
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rc = freezable_schedule_hrtimeout_range(expires, slack,
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HRTIMER_MODE_ABS);
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__set_current_state(TASK_RUNNING);
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/*
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