Subject: + rbtree-add-rbtree_postorder_for_each_entry_safe-helper.patch added to -mm tree
To: cody@xxxxxxxxxxxxxxxxxx,David.Woodhouse@xxxxxxxxx,riel@xxxxxxxxxx,sjenning@xxxxxxxxxxxxxxxxxx,walken@xxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Mon, 29 Jul 2013 15:43:56 -0700
The patch titled
Subject: rbtree: add rbtree_postorder_for_each_entry_safe() helper
has been added to the -mm tree. Its filename is
rbtree-add-rbtree_postorder_for_each_entry_safe-helper.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/rbtree-add-rbtree_postorder_for_each_entry_safe-helper.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/rbtree-add-rbtree_postorder_for_each_entry_safe-helper.patch
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------------------------------------------------------
From: Cody P Schafer <cody@xxxxxxxxxxxxxxxxxx>
Subject: rbtree: add rbtree_postorder_for_each_entry_safe() helper
Because deletion (of the entire tree) is a relatively common use of the
rbtree_postorder iteration, and because doing it safely means fiddling
with temporary storage, provide a helper to simplify postorder rbtree
iteration.
Signed-off-by: Cody P Schafer <cody@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Seth Jennings <sjenning@xxxxxxxxxxxxxxxxxx>
Cc: David Woodhouse <David.Woodhouse@xxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Michel Lespinasse <walken@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/rbtree.h | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff -puN include/linux/rbtree.h~rbtree-add-rbtree_postorder_for_each_entry_safe-helper include/linux/rbtree.h
--- a/include/linux/rbtree.h~rbtree-add-rbtree_postorder_for_each_entry_safe-helper
+++ a/include/linux/rbtree.h
@@ -85,4 +85,22 @@ static inline void rb_link_node(struct r
*rb_link = node;
}
+/**
+ * rbtree_postorder_for_each_entry_safe - iterate over rb_root in post order of
+ * given type safe against removal of rb_node entry
+ *
+ * @pos: the 'type *' to use as a loop cursor.
+ * @n: another 'type *' to use as temporary storage
+ * @root: 'rb_root *' of the rbtree.
+ * @field: the name of the rb_node field within 'type'.
+ */
+#define rbtree_postorder_for_each_entry_safe(pos, n, root, field) \
+ for (pos = rb_entry(rb_first_postorder(root), typeof(*pos), field),\
+ n = rb_entry(rb_next_postorder(&pos->field), \
+ typeof(*pos), field); \
+ &pos->field; \
+ pos = n, \
+ n = rb_entry(rb_next_postorder(&pos->field), \
+ typeof(*pos), field))
+
#endif /* _LINUX_RBTREE_H */
_
Patches currently in -mm which might be from cody@xxxxxxxxxxxxxxxxxx are
mm-page_alloc-restructure-free-page-stealing-code-and-fix-a-bug.patch
mm-page_alloc-restructure-free-page-stealing-code-and-fix-a-bug-fix.patch
mm-fix-the-value-of-fallback_migratetype-in-alloc_extfrag-tracepoint.patch
rbtree-add-postorder-iteration-functions.patch
rbtree-add-rbtree_postorder_for_each_entry_safe-helper.patch
rbtree_test-add-test-for-postorder-iteration.patch
rbtree-allow-tests-to-run-as-builtin.patch
mm-zswap-use-postorder-iteration-when-destroying-rbtree.patch
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