evie/android_kernel_oneplus_msm8998
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[PATCH] NOHZ: Fix RCU handling

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When a CPU is needed for RCU the tick has to continue even when it was
stopped before.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ingo Molnar 2007-02-19 18:11:56 +00:00 • committed by Linus Torvalds
parent 2aa6eb313e
commit 6ba9b346e1
1 changed files with 4 additions and 4 deletions
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8
kernel/time/tick-sched.c
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@ -191,19 +191,19 @@ void tick_nohz_stop_sched_tick(void)
next_jiffies = get_next_timer_interrupt(last_jiffies); next_jiffies = get_next_timer_interrupt(last_jiffies);
delta_jiffies = next_jiffies - last_jiffies; delta_jiffies = next_jiffies - last_jiffies;
if (rcu_needs_cpu(cpu))
delta_jiffies = 1;
/* /*
* Do not stop the tick, if we are only one off * Do not stop the tick, if we are only one off
* or if the cpu is required for rcu * or if the cpu is required for rcu
*/ */
if (!ts->tick_stopped && (delta_jiffies == 1 || rcu_needs_cpu(cpu))) if (!ts->tick_stopped && delta_jiffies == 1)
goto out; goto out;
/* Schedule the tick, if we are at least one jiffie off */ /* Schedule the tick, if we are at least one jiffie off */
if ((long)delta_jiffies >= 1) { if ((long)delta_jiffies >= 1) {
if (rcu_needs_cpu(cpu)) if (delta_jiffies > 1)
delta_jiffies = 1;
else
cpu_set(cpu, nohz_cpu_mask); cpu_set(cpu, nohz_cpu_mask);
/* /*
* nohz_stop_sched_tick can be called several times before * nohz_stop_sched_tick can be called several times before