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Accessing GCR_EL1 and issuing an ISB can be expensive on some microarchitectures. Although we must write to GCR_EL1, we can restructure the code to avoid reading from it because the new value can be derived entirely from the exclusion mask, which is already in a GPR. Do so. Signed-off-by: Peter Collingbourne <pcc@google.com> Link: https://linux-review.googlesource.com/id/I560a190a74176ca4cc5191dad08f77f6b1577c75 Link: https://lore.kernel.org/r/20210714013638.3995315-1-pcc@google.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>