On Wed, Apr 28, 2021 at 03:36:02PM +0000, Liam Howlett wrote:

+/* Flags:
+ * MAPLE_ALLOC_RANGE	Use allocation ranges (tracks gaps) in this tree
+ * MAPLE_USE_RCU	Operate in read/copy/update mode for multi-readers.
+ * MAPLE_HEIGHT_OFFSET	The position of the tree height in the flags
+ * MAPLE_HEIGHT_MASK	The mask for the maple tree height value.
+ */

Regular comment style would be:

/*
 * Flags:
 ...
 */

+#define MAPLE_ALLOC_RANGE	1	// Bit 0
+#define MAPLE_USE_RCU		2	// Bit 1
+#define	MAPLE_HEIGHT_OFFSET	2	// Bit 2
+#define	MAPLE_HEIGHT_MASK	60	// Bits 2-5

Can we pretty please keep masks in hex, like:

#define MAPLE_HEIGHT_MASK	0x3c

Because then it's instantly obvious is it bits 2-5.