linux-kernel - [PATCH 1/2] cputime: remove prev_{u,s}time if VIRT_CPU

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Message-ID: <4B138E45.4080401@jp.fujitsu.com>
Date:	Mon, 30 Nov 2009 18:20:05 +0900
From:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
To:	Stanislaw Gruszka <sgruszka@...hat.com>,
	linux-kernel@...r.kernel.org
CC:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Spencer Candland <spencer@...ehost.com>,
	Américo Wang <xiyou.wangcong@...il.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Balbir Singh <balbir@...ibm.com>
Subject: [PATCH 1/2] cputime: remove prev_{u,s}time if VIRT_CPU_ACCOUNTING

They are used in task_times(), only when !VIRT_CPU_ACCOUNTING.
Add ifndef-endif for them.

Signed-off-by: Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
---
 include/linux/sched.h |    2 ++
 kernel/fork.c         |    2 ++
 2 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 0395b0f..dff85e5 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1331,7 +1331,9 @@ struct task_struct {
 
 	cputime_t utime, stime, utimescaled, stimescaled;
 	cputime_t gtime;
+#ifndef CONFIG_VIRT_CPU_ACCOUNTING
 	cputime_t prev_utime, prev_stime;
+#endif
 	unsigned long nvcsw, nivcsw; /* context switch counts */
 	struct timespec start_time; 		/* monotonic time */
 	struct timespec real_start_time;	/* boot based time */
diff --git a/kernel/fork.c b/kernel/fork.c
index 166b8c4..ad7cb6d 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1066,8 +1066,10 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 	p->gtime = cputime_zero;
 	p->utimescaled = cputime_zero;
 	p->stimescaled = cputime_zero;
+#ifndef CONFIG_VIRT_CPU_ACCOUNTING
 	p->prev_utime = cputime_zero;
 	p->prev_stime = cputime_zero;
+#endif
 
 	p->default_timer_slack_ns = current->timer_slack_ns;
 
-- 
1.6.5.3


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