[dpdk-dev,v7,03/26] eal: fix check for power of 2 in 0 case
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Message ID 1421873870-21754-3-git-send-email-nhorman@tuxdriver.com
State Not Applicable, archived
Headers show

Commit Message

Neil Horman Jan. 21, 2015, 8:57 p.m. UTC
From: Ravi Kerur <rkerur@gmail.com>

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>
---
 lib/librte_eal/common/include/rte_common.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch
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diff --git a/lib/librte_eal/common/include/rte_common.h b/lib/librte_eal/common/include/rte_common.h
index 921b91f..8ac940c 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));
 }
 
 /**