svn commit: r345097 - head/sys/compat/linuxkpi/common/include/linux

[Hans Petter Selasky]

Author: hselasky
Date: Wed Mar 13 18:47:17 2019
New Revision: 345097
URL: https://svnweb.freebsd.org/changeset/base/345097

Log:
  Implement list_for_each_entry_from_reverse() and
  list_bulk_move_tail() in the LinuxKPI.
  
  Submitted by:		Johannes Lundberg <johalun0 at gmail.com>
  MFC after:		1 week
  Sponsored by:		Limelight Networks
  Sponsored by:		Mellanox Technologies

Modified:
  head/sys/compat/linuxkpi/common/include/linux/list.h

Modified: head/sys/compat/linuxkpi/common/include/linux/list.h
==============================================================================
--- head/sys/compat/linuxkpi/common/include/linux/list.h	Wed Mar 13 18:44:06 2019	(r345096)
+++ head/sys/compat/linuxkpi/common/include/linux/list.h	Wed Mar 13 18:47:17 2019	(r345097)
@@ -228,6 +228,10 @@ list_del_init(struct list_head *entry)
 
 #define	list_for_each_prev(p, h) for (p = (h)->prev; p != (h); p = (p)->prev)
 
+#define	list_for_each_entry_from_reverse(p, h, field)	\
+	for (; &p->field != (h);			\
+	     p = list_prev_entry(p, field))
+
 static inline void
 list_add(struct list_head *new, struct list_head *head)
 {
@@ -256,6 +260,18 @@ list_move_tail(struct list_head *entry, struct list_he
 
 	list_del(entry);
 	list_add_tail(entry, head);
+}
+
+static inline void
+list_bulk_move_tail(struct list_head *head, struct list_head *first,
+    struct list_head *last)
+{
+	first->prev->next = last->next;
+	last->next->prev = first->prev;
+	head->prev->next = first;
+	first->prev = head->prev;
+	last->next = head;
+	head->prev = last;
 }
 
 static inline void