[PATCH 2/5] linux: bitmap.h: add 'for_each_set_bitrange' iteration macro

[lukas.funke-oss at weidmueller.com]

From: Lukas Funke <lukas.funke at weidmueller.com>

Add 'for_each_set_bitrange' (from Linux kernel) in order to iterate
over each set bitrange of a bitmap. This becomes handy if one wants
to generate a cpu list i.e. for isolcpu or nohz_full.

Signed-off-by: Lukas Funke <lukas.funke at weidmueller.com>
---

 include/linux/bitmap.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h
index 0a8503af9f..9714533078 100644
--- a/include/linux/bitmap.h
+++ b/include/linux/bitmap.h
@@ -159,6 +159,13 @@ static inline unsigned long find_first_bit(const unsigned long *addr, unsigned l
 	     (bit) < (size);					\
 	     (bit) = find_next_bit((addr), (size), (bit) + 1))
 
+#define for_each_set_bitrange(b, e, addr, size)			\
+	for ((b) = 0;						\
+	     (b) = find_next_bit((addr), (size), b),		\
+	     (e) = find_next_zero_bit((addr), (size), (b) + 1),	\
+	     (b) < (size);					\
+	     (b) = (e) + 1)
+
 static inline unsigned long
 bitmap_find_next_zero_area(unsigned long *map,
 			   unsigned long size,
-- 
2.30.2