drbd: Turn drbd_printk() into a polymorphic macro
This allows drbd_alert(), drbd_err(), drbd_warn(), and drbd_info() to work for a resource, device, or connection so that we don't have to introduce three separate sets of macros for that. The drbd_printk() macro itself is pretty ugly, but that problem is limited to one place in the code. Using drbd_printk() on an object type which it doesn't understand results in an undefined drbd_printk_with_wrong_object_type symbol. Signed-off-by: NAndreas Gruenbacher <agruen@linbit.com> Signed-off-by: NPhilipp Reisner <philipp.reisner@linbit.com>
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