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authorIngo Molnar <mingo@kernel.org>2015-03-27 10:04:06 +0100
committerIngo Molnar <mingo@kernel.org>2015-03-27 10:04:06 +0100
commit4bfe186dbe0a058680e4bfb0d673194f0ceaffd4 (patch)
tree5e374857dcd979d50f51c7091505784cb053d078 /kernel/sched
parent3c435c1e472ba344ee25f795f4807d4457e61f6c (diff)
parent42528795ac1c8d7ba021797ec004904168956d64 (diff)
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Merge branch 'for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu
Pull RCU updates from Paul E. McKenney: - Documentation updates. - Changes permitting use of call_rcu() and friends very early in boot, for example, before rcu_init() is invoked. - Miscellaneous fixes. - Add in-kernel API to enable and disable expediting of normal RCU grace periods. - Improve RCU's handling of (hotplug-) outgoing CPUs. Note: ARM support is lagging a bit here, and these improved diagnostics might generate (harmless) splats. - NO_HZ_FULL_SYSIDLE fixes. - Tiny RCU updates to make it more tiny. Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched')
-rw-r--r--kernel/sched/idle.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c
index 80014a178342..d27d36476dca 100644
--- a/kernel/sched/idle.c
+++ b/kernel/sched/idle.c
@@ -210,6 +210,8 @@ use_default:
goto exit_idle;
}
+DEFINE_PER_CPU(bool, cpu_dead_idle);
+
/*
* Generic idle loop implementation
*
@@ -234,8 +236,13 @@ static void cpu_idle_loop(void)
check_pgt_cache();
rmb();
- if (cpu_is_offline(smp_processor_id()))
+ if (cpu_is_offline(smp_processor_id())) {
+ rcu_cpu_notify(NULL, CPU_DYING_IDLE,
+ (void *)(long)smp_processor_id());
+ smp_mb(); /* all activity before dead. */
+ this_cpu_write(cpu_dead_idle, true);
arch_cpu_idle_dead();
+ }
local_irq_disable();
arch_cpu_idle_enter();