rcu_do_batch() decrements rdp->qlen with irqs enabled. This is not good,
it can also be modified by call_rcu() from interrupt.
Decrement ->qlen once with irqs disabled, after a main loop.
Signed-off-by: Oleg Nesterov <[email protected]>
--- rc6-mm1/kernel/rcupdate.c~ 2006-08-22 16:22:49.000000000 +0400
+++ rc6-mm1/kernel/rcupdate.c 2006-09-11 01:24:17.000000000 +0400
@@ -241,12 +241,16 @@ static void rcu_do_batch(struct rcu_data
next = rdp->donelist = list->next;
list->func(list);
list = next;
- rdp->qlen--;
if (++count >= rdp->blimit)
break;
}
+
+ local_irq_disable();
+ rdp->qlen -= count;
+ local_irq_enable();
if (rdp->blimit == INT_MAX && rdp->qlen <= qlowmark)
rdp->blimit = blimit;
+
if (!rdp->donelist)
rdp->donetail = &rdp->donelist;
else
-
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