On Sun, Apr 21, 2013 at 10:51:39PM +0200, Borislav Petkov wrote:
> A similar oneliner at the end of the resume path.
>
> Maybe have rcu suspend/resume callbacks where you can do this stuff
> and maybe more in the future.
Ok, here's one - it is pretty straight-forward using that notifier
abomination :-). It is only in rcutree.c, it could probably be shared
with rcutiny.c. And it has a section mismatch but I'll fix that too.
It works though - two suspend/resume cycles looked ok.
--
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 986d1d3a34f5..cb1f61ede2f9 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -53,6 +53,7 @@
#include <linux/delay.h>
#include <linux/stop_machine.h>
#include <linux/random.h>
+#include <linux/suspend.h>
#include "rcutree.h"
#include <trace/events/rcu.h>
@@ -3097,6 +3098,22 @@ static int __cpuinit rcu_cpu_notify(struct
notifier_block *self,
return NOTIFY_OK;
}
+static int __cpuinit rcu_pm_notify(struct notifier_block *self,
+ unsigned long action, void *hcpu)
+{
+ switch (action) {
+ case PM_HIBERNATION_PREPARE:
+ rcu_expedited = 1;
+ break;
+ case PM_POST_RESTORE:
+ rcu_expedited = 0;
+ break;
+ default:
+ break;
+ }
+ return NOTIFY_OK;
+}
+
/*
* Spawn the kthread that handles this RCU flavor's grace periods.
*/
@@ -3323,6 +3340,7 @@ void __init rcu_init(void)
* or the scheduler are operational.
*/
cpu_notifier(rcu_cpu_notify, 0);
+ pm_notifier(rcu_pm_notify, 0);
for_each_online_cpu(cpu)
rcu_cpu_notify(NULL, CPU_UP_PREPARE, (void *)(long)cpu);
}
--
Regards/Gruss,
Boris.
Sent from a fat crate under my desk. Formatting is fine.
--
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
