tree d7081b6226e45a468823885d998b1434a4c1cc3e
parent 9b03d8abe06d92195712fd489b2e8983de27fa68
author Paul Burton <paul.burton@imgtec.com> 1496440130 -0700
committer Ralf Baechle <ralf@linux-mips.org> 1498696948 +0200

MIPS: CM: Avoid per-core locking with CM3 & higher

CM3 provides a GCR_CL_OTHER register per VP, rather than only per core.
This means that we don't need to prevent other VPs within a core from
racing with code that makes use of the core-other register region.

Reduce locking overhead by demoting the per-core spinlock providing
protection for CM2.5 & lower to a per-CPU/per-VP spinlock for CM3 &
higher.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/16193/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>