arm64: Add a helper for parking CPUs in a loop
Adds a routine which can be used to park CPUs (spinning in kernel) when they can't be killed. Cc: Mark Rutland <mark.rutland@arm.com> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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