six locks: Add start_time to six_lock_waiter

This is needed by the cycle detector in bcachefs - we need a way to
iterater over waitlist entries while dropping and retaking the waitlist
lock.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/six.h b/include/linux/six.h
index f336ae049df8..fe4b6292d773 100644
--- a/include/linux/six.h
+++ b/include/linux/six.h
@@ -119,6 +119,7 @@ struct six_lock_waiter {
 	struct task_struct	*task;
 	enum six_lock_type	lock_want;
 	bool			lock_acquired;
+	u64			start_time;
 };
 
 typedef int (*six_lock_should_sleep_fn)(struct six_lock *lock, void *);