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Subject[PATCH RFC tip/core/rcu 11/13] rcu: Identify dyntick-idle CPUs on first force_quiescent_state() pass
Date
From: Paul E. McKenney <paul.mckenney@linaro.org>

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>
---
kernel/rcutree.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index aab9ed5..69bb372 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -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;
}

/*
--
1.7.3.2


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