linux-kernel - [PATCH v2 1/6] maple_tree: add mas_for_each

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Message-ID: <20240902044128.664075-2-surenb@google.com>
Date: Sun,  1 Sep 2024 21:41:23 -0700
From: Suren Baghdasaryan <surenb@...gle.com>
To: akpm@...ux-foundation.org
Cc: kent.overstreet@...ux.dev, corbet@....net, arnd@...db.de, 
	mcgrof@...nel.org, rppt@...nel.org, paulmck@...nel.org, thuth@...hat.com, 
	tglx@...utronix.de, bp@...en8.de, xiongwei.song@...driver.com, 
	ardb@...nel.org, david@...hat.com, vbabka@...e.cz, mhocko@...e.com, 
	hannes@...xchg.org, roman.gushchin@...ux.dev, dave@...olabs.net, 
	willy@...radead.org, liam.howlett@...cle.com, pasha.tatashin@...een.com, 
	souravpanda@...gle.com, keescook@...omium.org, dennis@...nel.org, 
	jhubbard@...dia.com, yuzhao@...gle.com, vvvvvv@...gle.com, 
	rostedt@...dmis.org, iamjoonsoo.kim@....com, rientjes@...gle.com, 
	minchan@...gle.com, kaleshsingh@...gle.com, linux-doc@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org, linux-mm@...ck.org, 
	linux-modules@...r.kernel.org, kernel-team@...roid.com, surenb@...gle.com, 
	"Liam R. Howlett" <Liam.Howlett@...cle.com>
Subject: [PATCH v2 1/6] maple_tree: add mas_for_each_rev() helper

Add mas_for_each_rev() function to iterate maple tree nodes in reverse
order.

Suggested-by: Liam R. Howlett <Liam.Howlett@...cle.com>
Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
---
 include/linux/maple_tree.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/include/linux/maple_tree.h b/include/linux/maple_tree.h
index 8e1504a81cd2..45e633806da2 100644
--- a/include/linux/maple_tree.h
+++ b/include/linux/maple_tree.h
@@ -592,6 +592,20 @@ static __always_inline void mas_reset(struct ma_state *mas)
 #define mas_for_each(__mas, __entry, __max) \
 	while (((__entry) = mas_find((__mas), (__max))) != NULL)
 
+/**
+ * mas_for_each_rev() - Iterate over a range of the maple tree in reverse order.
+ * @__mas: Maple Tree operation state (maple_state)
+ * @__entry: Entry retrieved from the tree
+ * @__min: minimum index to retrieve from the tree
+ *
+ * When returned, mas->index and mas->last will hold the entire range for the
+ * entry.
+ *
+ * Note: may return the zero entry.
+ */
+#define mas_for_each_rev(__mas, __entry, __min) \
+	while (((__entry) = mas_find_rev((__mas), (__min))) != NULL)
+
 #ifdef CONFIG_DEBUG_MAPLE_TREE
 enum mt_dump_format {
 	mt_dump_dec,
-- 
2.46.0.469.g59c65b2a67-goog