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| From | "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> |
| Newsgroups | linux.kernel |
| Subject | [PATCH v2 tip/core/rcu 02/11] rcu: Clarify role of ->expmaskinitnext |
| Date | Thu, 10 Dec 2015 00:10:04 +0100 |
| Message-ID | <qDW20-6ob-67@gated-at.bofh.it> (permalink) |
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| X-Original-Cc | mingo@kernel.org, jiangshanlai@gmail.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, dvhart@linux.intel.com, fweisbec@gmail.com, oleg@redhat.com, bobby.prani@gmail.com, "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> |
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Analogy with the ->qsmaskinitnext field might lead one to believe that
->expmaskinitnext tracks online CPUs. This belief is incorrect: Any CPU
that has ever been online will have its bit set in the ->expmaskinitnext
field. This commit therefore adds a comment to make this clear, at
least to people who read comments.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---
kernel/rcu/tree.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h
index f32bebb6bc90..8151971a8978 100644
--- a/kernel/rcu/tree.h
+++ b/kernel/rcu/tree.h
@@ -178,6 +178,8 @@ struct rcu_node {
/* beginning of each expedited GP. */
unsigned long expmaskinitnext;
/* Online CPUs for next expedited GP. */
+ /* Any CPU that has ever been online will */
+ /* have its bit set. */
unsigned long grpmask; /* Mask to apply to parent qsmask. */
/* Only one bit will be set in this mask. */
int grplo; /* lowest-numbered CPU or group here. */
--
2.5.2
--
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[PATCH v2 tip/core/rcu 02/11] rcu: Clarify role of ->expmaskinitnext "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-12-10 00:10 +0100
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