On Wed, Jul 24, 2013 at 10:00:05AM -0500, Robert Jennings wrote:

When an associativity level change is found for one thread, the
siblings threads need to be updated as well.  This is done today
for PRRN in stage_topology_update() but is missing for VPHN in
update_cpu_associativity_changes_mask().

All threads should be updated to move to the new node.  Without this
patch, a single thread may be flagged for a topology change, leaving it
in a different node from its siblings, which is incorrect.  This causes
problems for the scheduler where overlapping scheduler groups are created
and a loop is formed in those groups.

Signed-off-by: Robert Jennings <redacted>
---
cpu_sibling_mask is now defined for UP which fixes that build break.
---
 arch/powerpc/include/asm/smp.h |  4 +++
 arch/powerpc/mm/numa.c         | 59 +++++++++++++++++++++++++++++++-----------
 2 files changed, 48 insertions(+), 15 deletions(-)

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read Documentation/stable_kernel_rules.txt
for how to do this properly.

</formletter>