apic: add global apic_get_class()
Every configuration has only up to one APIC class and we'll be extending the class with a function that can be called without an instanced object, so a direct access to the class is convenient. This patch will break compilation if some code uses apic_get_class() with CONFIG_USER_ONLY. Suggested-by: NEduardo Habkost <ehabkost@redhat.com> Reviewed-by: NEduardo Habkost <ehabkost@redhat.com> Reviewed-by: NPeter Xu <peterx@redhat.com> Signed-off-by: NRadim Krčmář <rkrcmar@redhat.com> Signed-off-by: NEduardo Habkost <ehabkost@redhat.com>
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