From: Ravi Kerur <rkerur@gmail.com>
Date: Sat, 27 Dec 2014 15:30:44 +0000 (-0500)
Subject: eal: fix check for power of 2 in 0 case
X-Git-Tag: spdx-start~9856
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=2fc8d6daa4c7a8b247e3bc2b791b1229e8bcd617;p=dpdk.git

eal: fix check for power of 2 in 0 case

rte_is_power_of_2 returns true for 0 and 0 is not power_of_2.
Fix by checking for n.

Signed-off-by: Ravi Kerur <rkerur@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
---

diff --git a/lib/librte_eal/common/include/rte_common.h b/lib/librte_eal/common/include/rte_common.h
index 921b91f37b..8ac940cbc5 100644
--- a/lib/librte_eal/common/include/rte_common.h
+++ b/lib/librte_eal/common/include/rte_common.h
@@ -203,7 +203,7 @@ extern int RTE_BUILD_BUG_ON_detected_error;
 static inline int
 rte_is_power_of_2(uint32_t n)
 {
-	return ((n-1) & n) == 0;
+	return n && !(n & (n - 1));
 }
 
 /**