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Now that we've added code to support pointer authentication, add some
documentation so that people can figure out if/how to use it.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com>
Reviewed-by: Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>
Cc: Andrew Jones <drjones@redhat.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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