Benjamin Herrenschmidt a619e59c07 powerpc/mm: Optimize detection of thread local mm's ...

Instead of comparing the whole CPU mask every time, let's
keep a counter of how many bits are set in the mask. Thus
testing for a local mm only requires testing if that counter
is 1 and the current CPU bit is set in the mask.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

2017-08-23 22:28:38 +10:00

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