[PATCH 01/12] useful: Add utility to find the next power of two

---
 ell/useful.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/ell/useful.h b/ell/useful.h
index 7bb924bcab8c..504ea089cb21 100644
--- a/ell/useful.h
+++ b/ell/useful.h
@@ -52,6 +52,12 @@ static inline unsigned char bit_field(const unsigned char oct,
 	return (oct >> start) & mask;
 }
 
+/* Must be called with n >= 2 and n <= ULONG_MAX / 2 + 1 */
+static inline unsigned long roundup_pow_of_two(unsigned long n)
+{
+	return 1UL << (sizeof(unsigned long) * 8 - __builtin_clzl(n - 1));
+}
+
 #define DIV_ROUND_CLOSEST(x, divisor)			\
 ({							\
 	typeof(divisor) _d = (divisor);			\
-- 
2.45.2