netdev - [PATCH v3 12/16] select: use freezable blocking call

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Message-Id: <1367884221-20462-13-git-send-email-ccross@android.com>
Date:	Mon,  6 May 2013 16:50:17 -0700
From:	Colin Cross <ccross@...roid.com>
To:	linux-kernel@...r.kernel.org
Cc:	Pavel Machek <pavel@....cz>, "Rafael J. Wysocki" <rjw@...k.pl>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mandeep Singh Baines <msb@...omium.org>,
	Colin Cross <ccross@...roid.com>,
	Oleg Nesterov <oleg@...hat.com>, linux-nfs@...r.kernel.org,
	linux-pm@...r.kernel.org, netdev@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel@...r.kernel.org
Subject: [PATCH v3 12/16] 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@...nel.org>
Signed-off-by: Colin Cross <ccross@...roid.com>
---
 fs/select.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/select.c b/fs/select.c
index 8c1c96c..6b14dc7 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -27,6 +27,7 @@
 #include <linux/rcupdate.h>
 #include <linux/hrtimer.h>
 #include <linux/sched/rt.h>
+#include <linux/freezer.h>
 
 #include <asm/uaccess.h>
 
@@ -236,7 +237,8 @@ int poll_schedule_timeout(struct poll_wqueues *pwq, int state,
 
 	set_current_state(state);
 	if (!pwq->triggered)
-		rc = schedule_hrtimeout_range(expires, slack, HRTIMER_MODE_ABS);
+		rc = freezable_schedule_hrtimeout_range(expires, slack,
+							HRTIMER_MODE_ABS);
 	__set_current_state(TASK_RUNNING);
 
 	/*
-- 
1.8.2.1

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