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rcu: Fix accelerated grace periods for last non-dynticked CPU

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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 <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>
Cc: [email protected]
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LKML-Reference: <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Paul E. McKenney 2010-02-26 16:38:56 -08:00 • committed by Ingo Molnar
commit a47cd880b5
3 changed files with 57 additions and 20 deletions
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3
kernel/rcutree.c
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@ -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