Commit-ID: f0e7c19db8798b4b991a2c71911e71f5dfdb348f Gitweb: http://git.kernel.org/tip/f0e7c19db8798b4b991a2c71911e71f5dfdb348f Author: Paul E. McKenney <paul.mckenney@xxxxxxxxxx> AuthorDate: Wed, 23 Nov 2011 15:02:05 -0800 Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> CommitDate: Sun, 11 Dec 2011 10:32:05 -0800 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@xxxxxxxxxx> Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> --- 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; } /* -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html