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powerpc: Rework setting up H/FSCR bit definitions
This reworks the Facility Status and Control Regsiter (FSCR) config bit definitions so that we can access the bit numbers. This is needed for a subsequent patch to fix the userspace DSCR handling. HFSCR and FSCR bit definitions are the same, so reuse them. Signed-off-by: Michael Neuling <mikey@neuling.org> Cc: <stable@vger.kernel.org> [v3.10] Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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