powerpc/mm: Move pgdir setting into a helper

Makes switch_mm_irqs_off() a bit more readable

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Benjamin Herrenschmidt 2017-07-24 14:27:58 +10:00 • committed by Michael Ellerman
commit 43ed84a891