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sched/core, x86/topology: Fix NUMA in package topology bug

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Current code can call set_cpu_sibling_map() and invoke sched_set_topology()
more than once (e.g. on CPU hot plug).  When this happens after
sched_init_smp() has been called, we lose the NUMA topology extension to
sched_domain_topology in sched_init_numa().  This results in incorrect
topology when the sched domain is rebuilt.

This patch fixes the bug and issues warning if we call sched_set_topology()
after sched_init_smp().

Signed-off-by: Tim Chen <[email protected]>
Signed-off-by: Srinivas Pandruvada <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Mike Galbraith <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Link: http://lkml.kernel.org/r/1474485552-141429-2-git-send-email-srinivas.pandruvada@linux.intel.com
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Tim Chen 2016-09-21 12:19:03 -07:00 • committed by Ingo Molnar
commit 8f37961cf2
2 changed files with 33 additions and 16 deletions
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3
kernel/sched/core.c
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@ -6552,6 +6552,9 @@ static struct sched_domain_topology_level *sched_domain_topology =
void set_sched_topology(struct sched_domain_topology_level *tl)
{
if (WARN_ON_ONCE(sched_smp_initialized))
return;
sched_domain_topology = tl;
}