tree 388b27000174cadcbead484da5c5f8a4398f0d46
parent f929a4641b93c0a45f188022bb9675214b3070d6
author Michael Ellerman <mpe@ellerman.id.au> 1406113956 +1000
committer Benjamin Herrenschmidt <benh@kernel.crashing.org> 1406520694 +1000

powerpc/perf: Clear all MMCR settings before calling compute_mmcr()

Because we reuse cpuhw->mmcr on each call to compute_mmcr() there's a
risk that we could forget to set one of the values and use whatever
value was in there previously.

Currently all the implementations are careful to set all the values, but
it's safer to clear them all before we call compute_mmcr().

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