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Subject[tip:sched/core] sched/topology: Move comment about asymmetric node setups
Commit-ID:  c20e1ea4b61c3d99a354d912f2d74822fd2a001d
Gitweb: http://git.kernel.org/tip/c20e1ea4b61c3d99a354d912f2d74822fd2a001d
Author: Lauro Ramos Venancio <lvenanci@redhat.com>
AuthorDate: Thu, 20 Apr 2017 16:51:42 -0300
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Mon, 15 May 2017 10:15:27 +0200

sched/topology: Move comment about asymmetric node setups

Signed-off-by: Lauro Ramos Venancio <lvenanci@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: lwang@redhat.com
Cc: riel@redhat.com
Link: http://lkml.kernel.org/r/1492717903-5195-4-git-send-email-lvenanci@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
kernel/sched/topology.c | 19 ++++++++++---------
1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index 5a4d9ae..c10f44a 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -495,14 +495,6 @@ enum s_alloc {
/*
* Build an iteration mask that can exclude certain CPUs from the upwards
* domain traversal.
- *
- * Asymmetric node setups can result in situations where the domain tree is of
- * unequal depth, make sure to skip domains that already cover the entire
- * range.
- *
- * In that case build_sched_domains() will have terminated the iteration early
- * and our sibling sd spans will be empty. Domains should always include the
- * CPU they're built on, so check that.
*/
static void build_group_mask(struct sched_domain *sd, struct sched_group *sg)
{
@@ -590,7 +582,16 @@ build_overlap_sched_groups(struct sched_domain *sd, int cpu)

sibling = *per_cpu_ptr(sdd->sd, i);

- /* See the comment near build_group_mask(). */
+ /*
+ * Asymmetric node setups can result in situations where the
+ * domain tree is of unequal depth, make sure to skip domains
+ * that already cover the entire range.
+ *
+ * In that case build_sched_domains() will have terminated the
+ * iteration early and our sibling sd spans will be empty.
+ * Domains should always include the CPU they're built on, so
+ * check that.
+ */
if (!cpumask_test_cpu(i, sched_domain_span(sibling)))
continue;

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