[PATCH tip/core/rcu] Fix TINY_RCU rcu_is_cpu_rrupt_from_idle check

* [PATCH tip/core/rcu] Fix TINY_RCU rcu_is_cpu_rrupt_from_idle check
@ 2012-11-16 19:26 Paul E. McKenney
  0 siblings, 0 replies; only message in thread
From: Paul E. McKenney @ 2012-11-16 19:26 UTC (permalink / raw)
  To: linux-kernel
  Cc: mingo, laijs, dipankar, akpm, mathieu.desnoyers, josh, niv, tglx,
	peterz, rostedt, Valdis.Kletnieks, dhowells, edumazet, darren,
	fweisbec, sbw, patches

The rcu_is_cpu_rrupt_from_idle() needs to allow for one interrupt level
from the idle loop, but TINY_RCU checks for a call from the idle loop
itself.  This commit fixes this issue.

Reported-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

 b/kernel/rcutiny.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/rcutiny.c b/kernel/rcutiny.c
index e4c6a59..e7dce58 100644
--- a/kernel/rcutiny.c
+++ b/kernel/rcutiny.c
@@ -195,7 +195,7 @@ EXPORT_SYMBOL(rcu_is_cpu_idle);
  */
 int rcu_is_cpu_rrupt_from_idle(void)
 {
-	return rcu_dynticks_nesting <= 0;
+	return rcu_dynticks_nesting <= 1;
 }
 
 /*


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