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rcu: Identify dyntick-idle CPUs on first force_quiescent_state() pass 

Fixes and workarounds for a number of issues (for example, that in
df4012edc) make it safe to once again detect dyntick-idle CPUs on the
first pass of force_quiescent_state(), so this commit makes that change.

Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2011-11-23 15:02:05 -08:00 committed by Paul E. McKenney
parent c92b131bdc
commit f0e7c19db8
1 changed files with 1 additions and 1 deletions
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2
kernel/rcutree.c
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@ -607,7 +607,7 @@ int rcu_is_cpu_rrupt_from_idle(void)
static int dyntick_save_progress_counter(struct rcu_data *rdp)
{
rdp->dynticks_snap = atomic_add_return(0, &rdp->dynticks->dynticks);
return 0;
return (rdp->dynticks_snap & 0x1) == 0;
}
/*