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| author | Peter Zijlstra <peterz@infradead.org> | 2014-07-22 11:47:40 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-07-28 10:04:13 +0200 |
| commit | 6ae72dff37596f736b795426306404f0793e4b1b (patch) | |
| tree | 89a6488a4766e799312672baae3350ade42cf276 /kernel/sched | |
| parent | ca5bc6cd5de5b53eb8fd6fea39aa3fe2a1e8c3d9 (diff) | |
| download | linux-6ae72dff37596f736b795426306404f0793e4b1b.tar.bz2 | |
sched: Robustify topology setup
We hard assume that higher topology levels are supersets of lower
levels.
Detect, warn and try to fixup when we encounter this violated.
Tested-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Josh Boyer <jwboyer@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Bruno Wolff III <bruno@wolff.to>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/20140722094740.GJ12054@laptop.lan
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/core.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 415ab0268b51..2a36a74c16ae 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -6481,6 +6481,20 @@ struct sched_domain *build_sched_domain(struct sched_domain_topology_level *tl, sched_domain_level_max = max(sched_domain_level_max, sd->level); child->parent = sd; sd->child = child; + + if (!cpumask_subset(sched_domain_span(child), + sched_domain_span(sd))) { + pr_err("BUG: arch topology borken\n"); +#ifdef CONFIG_SCHED_DEBUG + pr_err(" the %s domain not a subset of the %s domain\n", + child->name, sd->name); +#endif + /* Fixup, ensure @sd has at least @child cpus. */ + cpumask_or(sched_domain_span(sd), + sched_domain_span(sd), + sched_domain_span(child)); + } + } set_domain_attribute(sd, attr); |