Commit 0cb3b855 authored Mar 19, 2019 by Seth Howell Committed by Darek Stojaczyk Mar 21, 2019

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>

parent 640547c5

include/spdk/util.h

+16 −0

Original line number	Diff line number	Diff line
		@@ -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.
		*/