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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2010-02-26 16:38:56 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-02-27 09:53:52 +0100 |
| commit | a47cd880b50e14b0b6f5e9d426ae9a2676c9c474 (patch) | |
| tree | c134dcec52450ec92ea853f4aeeef8e3967a36cb /kernel/rcutree.c | |
| parent | f5f654096487c6d526c47bb66308f9de81f091cf (diff) | |
| download | blackbird-op-linux-a47cd880b50e14b0b6f5e9d426ae9a2676c9c474.tar.gz blackbird-op-linux-a47cd880b50e14b0b6f5e9d426ae9a2676c9c474.zip | |
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.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/rcutree.c b/kernel/rcutree.c index 335bfe4f0076..3ec8160fc75f 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 |
