[04/11] drm/i915: Add list_for_each_entry_safe_continue_reverse
diff mbox series

Message ID 20200528211524.29107-4-chris@chris-wilson.co.uk
State New
Headers show
Series
  • [01/11] drm/i915/gt: Start timeslice on partial submission
Related show

Commit Message

Chris Wilson May 28, 2020, 9:15 p.m. UTC
One more list iterator variant, for when we want to unwind from inside
one list iterator with the intention of restarting from the current
entry as the new head of the list.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_utils.h | 6 ++++++
 1 file changed, 6 insertions(+)

Patch
diff mbox series

diff --git a/drivers/gpu/drm/i915/i915_utils.h b/drivers/gpu/drm/i915/i915_utils.h
index 03a73d2bd50d..6ebccdd12d4c 100644
--- a/drivers/gpu/drm/i915/i915_utils.h
+++ b/drivers/gpu/drm/i915/i915_utils.h
@@ -266,6 +266,12 @@  static inline int list_is_last_rcu(const struct list_head *list,
 	return READ_ONCE(list->next) == head;
 }
 
+#define list_for_each_entry_safe_continue_reverse(pos, n, head, member)	\
+	for (pos = list_prev_entry(pos, member),			\
+	     n = list_prev_entry(pos, member);				\
+	     &pos->member != (head);					\
+	     pos = n, n = list_prev_entry(n, member))
+
 /*
  * Wait until the work is finally complete, even if it tries to postpone
  * by requeueing itself. Note, that if the worker never cancels itself,