Messages in this thread Patch in this message | | | From | "Paul E. McKenney" <> | Subject | [PATCH RFC tip/core/rcu 11/13] rcu: Identify dyntick-idle CPUs on first force_quiescent_state() pass | Date | Mon, 28 Nov 2011 15:33:03 -0800 |
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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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