The patch titled
rcu: fix hibernate/resume in presence of PREEMPT_RCU and hotplug
has been removed from the -mm tree. Its filename was
rcu-fix-hibernate-resume-in-presence-of-preempt_rcu-and-hotplug.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: rcu: fix hibernate/resume in presence of PREEMPT_RCU and hotplug
From: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>
This fixes a WARN_ON() encountered when doing hibernate/resume in presence of
PREEMPT_RCU. The problem was that the code failed to disable preemption when
accessing a per-CPU variable. This is OK when called from code that already
has preemption disabled, but such is not the case from the suspend/resume code
path.
Reported-by: Dave Young <hidave.darkstar@xxxxxxxxx>
Tested-by: Dave Young <hidave.darkstar@xxxxxxxxx>
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/rcupreempt.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff -puN kernel/rcupreempt.c~rcu-fix-hibernate-resume-in-presence-of-preempt_rcu-and-hotplug kernel/rcupreempt.c
--- a/kernel/rcupreempt.c~rcu-fix-hibernate-resume-in-presence-of-preempt_rcu-and-hotplug
+++ a/kernel/rcupreempt.c
@@ -702,8 +702,9 @@ void rcu_offline_cpu(int cpu)
* fix.
*/
+ local_irq_save(flags);
rdp = RCU_DATA_ME();
- spin_lock_irqsave(&rdp->lock, flags);
+ spin_lock(&rdp->lock);
*rdp->nexttail = list;
if (list)
rdp->nexttail = tail;
_
Patches currently in -mm which might be from paulmck@xxxxxxxxxxxxxxxxxx are
git-sched.patch
kthread-add-a-missing-memory-barrier-to-kthread_stop.patch
kthread-call-wake_up_process-without-the-lock-being-held.patch
remove-rcu_assign_pointernull-penalty-with-type-macro-safety.patch
add-rcu_assign_index-if-ever-needed.patch
add-rcu_assign_index-if-ever-needed-fix.patch
rcu-split-listh-and-move-rcu-protected-lists-into-rculisth.patch
lock_task_sighand-add-rcu-lock-unlock.patch
k_getrusage-dont-take-rcu_read_lock.patch
do_task_stat-dont-take-rcu_read_lock.patch
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