linux-kernel - [PATCH 2/4] posix_cpu_timers: Consolidate timer list cleanups

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Date:	Fri, 15 Mar 2013 17:54:00 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Stanislaw Gruszka <sgruszka@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>, Oleg Nesterov <oleg@...hat.com>
Subject: [PATCH 2/4] posix_cpu_timers: Consolidate timer list cleanups

Cleaning up the posix cpu timers on task exit shares
some common code among timer list types, most notably the
list traversal and expiry time update.

Unify this in a common helper.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Stanislaw Gruszka <sgruszka@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Oleg Nesterov <oleg@...hat.com>
---
 kernel/posix-cpu-timers.c |   48 +++++++++++++++++---------------------------
 1 files changed, 19 insertions(+), 29 deletions(-)

diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index e5286b5..b30775f 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -382,6 +382,21 @@ static int posix_cpu_timer_del(struct k_itimer *timer)
 	return ret;
 }
 
+static void cleanup_timers_list(struct list_head *head,
+				unsigned long long curr)
+{
+	struct cpu_timer_list *timer, *next;
+
+	list_for_each_entry_safe(timer, next, head, entry) {
+		list_del_init(&timer->entry);
+		if (timer->expires < curr) {
+			timer->expires = 0;
+		} else {
+			timer->expires -= curr;
+		}
+	}
+}
+
 /*
  * Clean out CPU timers still ticking when a thread exited.  The task
  * pointer is cleared, and the expiry time is replaced with the residual
@@ -392,37 +407,12 @@ static void cleanup_timers(struct list_head *head,
 			   cputime_t utime, cputime_t stime,
 			   unsigned long long sum_exec_runtime)
 {
-	struct cpu_timer_list *timer, *next;
-	cputime_t ptime = utime + stime;
 
-	list_for_each_entry_safe(timer, next, head, entry) {
-		list_del_init(&timer->entry);
-		if (timer->expires < cputime_to_expires(ptime)) {
-			timer->expires = 0;
-		} else {
-			timer->expires -= cputime_to_expires(ptime);
-		}
-	}
-
-	++head;
-	list_for_each_entry_safe(timer, next, head, entry) {
-		list_del_init(&timer->entry);
-		if (timer->expires < cputime_to_expires(utime)) {
-			timer->expires = 0;
-		} else {
-			timer->expires -= cputime_to_expires(utime);
-		}
-	}
+	cputime_t ptime = utime + stime;
 
-	++head;
-	list_for_each_entry_safe(timer, next, head, entry) {
-		list_del_init(&timer->entry);
-		if (timer->expires < sum_exec_runtime) {
-			timer->expires = 0;
-		} else {
-			timer->expires -= sum_exec_runtime;
-		}
-	}
+	cleanup_timers_list(head, cputime_to_expires(ptime));
+	cleanup_timers_list(++head, cputime_to_expires(utime));
+	cleanup_timers_list(++head, sum_exec_runtime);
 }
 
 /*
-- 
1.7.5.4

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