[PATCH] md: complete conversion of md to use kthreads

There are a few loose ends following the conversion of md to use kthreads:

- Some fields in mdk_thread_t that aren't needed (kthreads does it's own
  completion and manages it's own name).

- thread->run is now never NULL, so no need to check

- Some tests for signal_pending that aren't needed (As we don't use signals
  to stop threads any more)

- Some flush_signals are not needed

- Some waits are interruptible and don't need to be.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/linux/raid/md_k.h

@@ -334,10 +334,8 @@ typedef struct mdk_thread_s {
 	mddev_t			*mddev;
 	wait_queue_head_t	wqueue;
 	unsigned long           flags;
-	struct completion	*event;
 	struct task_struct	*tsk;
 	unsigned long		timeout;
-	const char		*name;
 } mdk_thread_t;
 
 #define THREAD_WAKEUP  0