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powerpc: Create msr_check_and_{set,clear}()
Create helper functions to set and clear MSR bits after first checking if they are already set. Grouping them will make it easy to avoid the MSR writes in a subsequent optimisation. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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Anton Blanchard
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Michael Ellerman
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Dec 1, 2015
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