drbd: remove macros using require_context

This require_context attribute originated in a proposed sparse patch by
Philipp Reisner back in 2008. Johannes Berg had a different solution to
a similar problem, and that patch "won" in the end; so the require_context
thing never got merged. The whole history can be read at [0].

DRBD kept using these annotations anyway for a while. Nowadays, on a
modern unmodified sparse, they obviously do nothing, and they are hardly
used anymore anyway.

So, just remove the definitions of these macros.

[0] https://www.spinics.net/lists/linux-sparse/msg01150.htmlSigned-off-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com>
Reviewed-by: Joel Colledge <joel.colledge@linbit.com>
Link: https://lore.kernel.org/r/20230113123538.144276-6-christoph.boehmwalder@linbit.comSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/drbd/drbd_int.h

@@ -40,16 +40,6 @@
 #include "drbd_protocol.h"
 #include "drbd_polymorph_printk.h"
 
-#ifdef __CHECKER__
-# define __protected_by(x)       __attribute__((require_context(x,1,999,"rdwr")))
-# define __protected_read_by(x)  __attribute__((require_context(x,1,999,"read")))
-# define __protected_write_by(x) __attribute__((require_context(x,1,999,"write")))
-#else
-# define __protected_by(x)
-# define __protected_read_by(x)
-# define __protected_write_by(x)
-#endif
-
 /* shared module parameters, defined in drbd_main.c */
 #ifdef CONFIG_DRBD_FAULT_INJECTION
 extern int drbd_enable_faults;
@@ -775,7 +765,7 @@ struct drbd_device {
 	unsigned long flags;
 
 	/* configured by drbdsetup */
-	struct drbd_backing_dev *ldev __protected_by(local);
+	struct drbd_backing_dev *ldev;
 
 	sector_t p_size;     /* partner's disk size */
 	struct request_queue *rq_queue;