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authorThomas Gleixner <tglx@linutronix.de>2013-02-16 02:47:07 +0400
committerIngo Molnar <mingo@kernel.org>2013-02-19 11:05:53 +0400
commitcdc4e86b58a95005ef500916b4a8e91a0037a822 (patch)
tree208e5eaf42c25fae3dfe5d086687c2a2fa30418b /kernel
parent993db4b45fd99949d8f6e004a7744b523dca473a (diff)
downloadlinux-cdc4e86b58a95005ef500916b4a8e91a0037a822.tar.xz
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@linutronix.de> Cc: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched/cputime.c10
1 files changed, 4 insertions, 6 deletions
diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
index ccff2752725a..9857329ed280 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));
}