util: add spdk_u32_is_pow2() function

Change-Id: I438053d85360f1c3ecc2b7661dbd573e0217ac46
Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>
Reviewed-on: https://review.gerrithub.io/373672
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>

include/spdk/util.h

@@ -67,6 +67,19 @@ spdk_align32pow2(uint32_t x)
 	return 1u << (1 + spdk_u32log2(x - 1));
 }
 
+/**
+ * Check if a uint32_t is a power of 2.
+ */
+static inline bool
+spdk_u32_is_pow2(uint32_t x)
+{
+	if (x == 0) {
+		return false;
+	}
+
+	return (x & (x - 1)) == 0;
+}
+
 #ifdef __cplusplus
 }
 #endif