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author | 2019-09-26 15:53:17 -0700 | |
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committer | 2019-09-26 15:53:17 -0700 | |
commit | da05b5ea12c1e50b2988a63470d6b69434796f8b (patch) | |
tree | 00311ffae4f9df37695ab8e285232d9b465b81bf | |
parent | Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/ke... (diff) | |
parent | timer: Read jiffies once when forwarding base clk (diff) | |
download | linux-da05b5ea12c1e50b2988a63470d6b69434796f8b.tar.gz linux-da05b5ea12c1e50b2988a63470d6b69434796f8b.tar.bz2 linux-da05b5ea12c1e50b2988a63470d6b69434796f8b.zip |
Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull timer fix from Ingo Molnar:
"Fix a timer expiry bug that would cause spurious delay of timers"
* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
timer: Read jiffies once when forwarding base clk
-rw-r--r-- | kernel/time/timer.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/kernel/time/timer.c b/kernel/time/timer.c index 0e315a2e77ae..4820823515e9 100644 --- a/kernel/time/timer.c +++ b/kernel/time/timer.c @@ -1678,24 +1678,26 @@ void timer_clear_idle(void) static int collect_expired_timers(struct timer_base *base, struct hlist_head *heads) { + unsigned long now = READ_ONCE(jiffies); + /* * NOHZ optimization. After a long idle sleep we need to forward the * base to current jiffies. Avoid a loop by searching the bitfield for * the next expiring timer. */ - if ((long)(jiffies - base->clk) > 2) { + if ((long)(now - base->clk) > 2) { unsigned long next = __next_timer_interrupt(base); /* * If the next timer is ahead of time forward to current * jiffies, otherwise forward to the next expiry time: */ - if (time_after(next, jiffies)) { + if (time_after(next, now)) { /* * The call site will increment base->clk and then * terminate the expiry loop immediately. */ - base->clk = jiffies; + base->clk = now; return 0; } base->clk = next; |