Re: [RESEND, V2] powerpc/numa: Invalidate numa_cpu_lookup_table on cpu remove

On Fri, 2018-01-26 at 19:41:59 UTC, Nathan Fontenot wrote:

When DLPAR removing a CPU, the unmapping of the cpu from a node in
unmap_cpu_from_node() should also invalidate the CPUs entry in the
numa_cpu_lookup_table. There is not a guarantee that on a subsequent
DLPAR add of the CPU the associativity will be the same and thus
could be in a different node. Invalidating the entry in the
numa_cpu_lookup_table causes the associativity to be read from the
device tree at the time of the add.

The current behavior of not invalidating the CPUs entry in the
numa_cpu_lookup_table can result in scenarios where the the topology
layout of CPUs in the partition does not match the device tree
or the topology reported by the HMC.

Signed-off-by: Nathan Fontenot <redacted>
Reviewed-by: Tyrel Datwyler <redacted>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/1d9a090783bef19fe8cdec878620d2

cheers