On Mon, 2 Oct 2017 11:38:07 +0100 Will Deacon [off-list ref] wrote:

quoted

When I executed numactl -H(which read /sys/devices/system/node/nodeX/cpumap
and display cpumask_of_node for each node), but I got different result on
X86 and arm64. For each numa node, the former only displayed online CPUs,
and the latter displayed all possible CPUs. Unfortunately, both Linux
documentation and numactl manual have not described it clear.

I sent a mail to ask for help, and Michal Hocko [off-list ref] replied
that he preferred to print online cpus because it doesn't really make much
sense to bind anything on offline nodes.

Signed-off-by: Zhen Lei <redacted>
Acked-by: Michal Hocko <mhocko@suse.com>
---
 drivers/base/node.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

Which tree is this intended to go through? I'm happy to take it via arm64,
but I don't want to tread on anybody's toes in linux-next and it looks like
there are already queued changes to this file via Andrew's tree.

I grabbed it.  I suppose there's some small risk of userspace breakage
so I suggest it be a 4.15-rc1 thing?