From 0cb3b8550a2fb38ee0b10c8223520b1453538469 Mon Sep 17 00:00:00 2001
From: Seth Howell <seth.howell@intel.com>
Date: Tue, 19 Mar 2019 16:14:26 -0700
Subject: [PATCH] util: add power of 2 alignment for uint64_t variables.

We need this for making sure we get proper allocations for our spdk
mempools.

Change-Id: I850c29768ef0551c5d1a2aa0c78dbd323535aa78
Signed-off-by: Seth Howell <seth.howell@intel.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/448493
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
---
 include/spdk/util.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/include/spdk/util.h b/include/spdk/util.h
index 78cb155ee..658a9b13d 100644
--- a/include/spdk/util.h
+++ b/include/spdk/util.h
@@ -70,6 +70,22 @@ spdk_align32pow2(uint32_t x)
 	return 1u << (1 + spdk_u32log2(x - 1));
 }
 
+static inline uint64_t
+spdk_u64log2(uint64_t x)
+{
+	if (x == 0) {
+		/* log(0) is undefined */
+		return 0;
+	}
+	return 63u - __builtin_clzl(x);
+}
+
+static inline uint64_t
+spdk_align64pow2(uint64_t x)
+{
+	return 1u << (1 + spdk_u64log2(x - 1));
+}
+
 /**
  * Check if a uint32_t is a power of 2.
  */