[PATCH 4/4] nptl: Add features to internal 'struct rseq_area'

[DJ Delorie]

Michael Jeanson <mjeanson@efficios.com> writes:
> The 'struct rseq_area' is used to define the offset of the various
> features available in the rseq ABI. Add fields that follow cpu_id
> (rseq_cs, flags, node_id, mm_cid) in preparation for their use.
>
> Access to features following the original rseq ABI 20 bytes (after
> 'flags') starting with 'node_id' must be gated by an rseq feature size
> test.
>
> Signed-off-by: Michael Jeanson <mjeanson@efficios.com>

LGTM
Reviewed-by: DJ Delorie <dj@redhat.com>