Commit-ID: d8e60bc39c695c5f646e7262b928cc10e0235716
Gitweb: http://git.kernel.org/tip/d8e60bc39c695c5f646e7262b928cc10e0235716
Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Fri, 15 Feb 2013 23:47:07 +0100
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Fri, 15 Feb 2013 23:47:07 +0100
cputime: Remove irqsave from seqlock readers
The reader side code has no requirement to disable interrupts while
sampling data. The sequence counter is enough to ensure consistency.
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
---
kernel/sched/cputime.c | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)
diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
index ccff275..9857329 100644
--- a/kernel/sched/cputime.c
+++ b/kernel/sched/cputime.c
@@ -729,18 +729,17 @@ void vtime_init_idle(struct task_struct *t)
cputime_t task_gtime(struct task_struct *t)
{
- unsigned long flags;
unsigned int seq;
cputime_t gtime;
do {
- seq = read_seqbegin_irqsave(&t->vtime_seqlock, flags);
+ seq = read_seqbegin(&t->vtime_seqlock);
gtime = t->gtime;
if (t->flags & PF_VCPU)
gtime += vtime_delta(t);
- } while (read_seqretry_irqrestore(&t->vtime_seqlock, seq, flags));
+ } while (read_seqretry(&t->vtime_seqlock, seq));
return gtime;
}
@@ -756,7 +755,6 @@ fetch_task_cputime(struct task_struct *t,
cputime_t *u_src, cputime_t *s_src,
cputime_t *udelta, cputime_t *sdelta)
{
- unsigned long flags;
unsigned int seq;
unsigned long long delta;
@@ -764,7 +762,7 @@ fetch_task_cputime(struct task_struct *t,
*udelta = 0;
*sdelta = 0;
- seq = read_seqbegin_irqsave(&t->vtime_seqlock, flags);
+ seq = read_seqbegin(&t->vtime_seqlock);
if (u_dst)
*u_dst = *u_src;
@@ -788,7 +786,7 @@ fetch_task_cputime(struct task_struct *t,
if (t->vtime_snap_whence == VTIME_SYS)
*sdelta = delta;
}
- } while (read_seqretry_irqrestore(&t->vtime_seqlock, seq, flags));
+ } while (read_seqretry(&t->vtime_seqlock, seq));
}
--
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