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>
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 @@
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 @@
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 @@
*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 @@
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));
}