xen/arm: Use p2m entry with lock protection
A new local variable is introduced for accessing p2m entry with lock protection. Signed-off-by: Hillf Danton <hdanton@sina.com> Signed-off-by: Stefano Stabellini <sstabellini@kernel.org> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
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