powerpc: Don't emulate mr. instructions
Currently emulate_step() emulates mr. instructions without updating cr0 and this can be disastrous. Don't emulate mr. This bug has been around for a while, but I am not sure if its a worthy -stable candidate. I'll leave it to Ben do decide. Signed-off-by: NAnanth N Mavinakayanahalli <ananth@in.ibm.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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