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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2010-02-27 00:38:56 (GMT)
committerIngo Molnar <mingo@elte.hu>2010-02-27 08:53:52 (GMT)
commita47cd880b50e14b0b6f5e9d426ae9a2676c9c474 (patch)
treec134dcec52450ec92ea853f4aeeef8e3967a36cb /kernel/rcutree.c
parentf5f654096487c6d526c47bb66308f9de81f091cf (diff)
downloadlinux-a47cd880b50e14b0b6f5e9d426ae9a2676c9c474.tar.xz
rcu: Fix accelerated grace periods for last non-dynticked CPU
It is invalid to invoke __rcu_process_callbacks() with irqs disabled, so do it indirectly via raise_softirq(). This requires a state-machine implementation to cycle through the grace-period machinery the required number of times. Located-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: mathieu.desnoyers@polymtl.ca Cc: josh@joshtriplett.org Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org Cc: Valdis.Kletnieks@vt.edu Cc: dhowells@redhat.com LKML-Reference: <1267231138-27856-1-git-send-email-paulmck@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/rcutree.c')
-rw-r--r--kernel/rcutree.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 335bfe4..3ec8160 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -1341,6 +1341,9 @@ static void rcu_process_callbacks(struct softirq_action *unused)
* grace-period manipulations above.
*/
smp_mb(); /* See above block comment. */
+
+ /* If we are last CPU on way to dyntick-idle mode, accelerate it. */
+ rcu_needs_cpu_flush();
}
static void