maple_tree: fix MAPLE_PARENT_RANGE32 and parent pointer docs

MAPLE_PARENT_RANGE32 should be 0x02 as a 32 bit node is indicated by the
bit pattern 0b010 which is the hex value 0x02.  There are no users
currently, so there is no associated bug with this wrong value.

Fix typo Note -> Node and replace x with b to indicate binary values.

Link: https://lkml.kernel.org/r/20250826151344.403286-1-sidhartha.kumar@oracle.com
Fixes: 54a611b60590 ("Maple Tree: add new data structure")
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/linux/maple_tree.h b/include/linux/maple_tree.h
index bafe143b1f783202e27b32567fffee4149e8e266..41e633264e513d18b04c6b38fecea82c0263dd66 100644 (file)
--- a/include/linux/maple_tree.h
+++ b/include/linux/maple_tree.h
@@ -57,17 +57,17 @@
  * MT_FLAGS_ALLOC_RANGE flag.
  *
  *  Node types:
- *   0x??1 = Root
- *   0x?00 = 16 bit nodes
- *   0x010 = 32 bit nodes
- *   0x110 = 64 bit nodes
+ *   0b??1 = Root
+ *   0b?00 = 16 bit nodes
+ *   0b010 = 32 bit nodes
+ *   0b110 = 64 bit nodes
  *
  *  Slot size and location in the parent pointer:
  *   type  : slot location
- *   0x??1 : Root
- *   0x?00 : 16 bit values, type in 0-1, slot in 2-6
- *   0x010 : 32 bit values, type in 0-2, slot in 3-6
- *   0x110 : 64 bit values, type in 0-2, slot in 3-6
+ *   0b??1 : Root
+ *   0b?00 : 16 bit values, type in 0-1, slot in 2-6
+ *   0b010 : 32 bit values, type in 0-2, slot in 3-6
+ *   0b110 : 64 bit values, type in 0-2, slot in 3-6
  */
 
 /*

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index b4ee2d29d7a962ca374467d0533185f2db3d35ff..c57a4615bdff91de9fec724369da92c91f60f024 100644 (file)
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -405,11 +405,11 @@ static __always_inline bool mt_is_alloc(struct maple_tree *mt)
  * a reuse of the last bit in the node type.  This is possible by using bit 1 to
  * indicate if bit 2 is part of the type or the slot.
  *
- * Note types:
- *  0x??1 = Root
- *  0x?00 = 16 bit nodes
- *  0x010 = 32 bit nodes
- *  0x110 = 64 bit nodes
+ * Node types:
+ *  0b??1 = Root
+ *  0b?00 = 16 bit nodes
+ *  0b010 = 32 bit nodes
+ *  0b110 = 64 bit nodes
  *
  * Slot size and alignment
  *  0b??1 : Root
@@ -427,7 +427,7 @@ static __always_inline bool mt_is_alloc(struct maple_tree *mt)
 #define MAPLE_PARENT_16B_SLOT_MASK     0xFC
 
 #define MAPLE_PARENT_RANGE64           0x06
-#define MAPLE_PARENT_RANGE32           0x04
+#define MAPLE_PARENT_RANGE32           0x02
 #define MAPLE_PARENT_NOT_RANGE16       0x02
 
 /*