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From: Ravi Kerur <rkerur@gmail.com>
To: dev@dpdk.org
Subject: [dpdk-dev] [PATCH 1/7] Fix rte_is_power_of_2
Date: Thu, 25 Dec 2014 10:33:11 -0500
Message-ID: <1419521597-31978-2-git-send-email-rkerur@gmail.com> (raw)
In-Reply-To: <1419521597-31978-1-git-send-email-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>
---
 lib/librte_eal/common/include/rte_common.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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));
 }
 
 /**
-- 
1.9.1

  reply	other threads:[~2014-12-25 15:33 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-12-25 15:33 [dpdk-dev] [PATCH 0/7] Move EAL common functions Ravi Kerur
2014-12-25 15:33 ` Ravi Kerur [this message]
2014-12-25 17:21   ` [dpdk-dev] [PATCH 1/7] Fix rte_is_power_of_2 Neil Horman
2014-12-25 18:54     ` Ravi Kerur
2014-12-25 15:33 ` [dpdk-dev] [PATCH 2/7] Move EAL common functions Ravi Kerur
2014-12-25 17:30   ` Neil Horman
2014-12-25 19:23     ` Ravi Kerur
2014-12-26 14:40       ` Neil Horman
2014-12-26 15:28         ` Ravi Kerur
2015-01-05  9:40           ` Thomas Monjalon
2014-12-25 15:33 ` [dpdk-dev] [PATCH 3/7] " Ravi Kerur
2014-12-25 17:41   ` Neil Horman
2014-12-25 19:13     ` Ravi Kerur
2014-12-26 14:40       ` Neil Horman
2014-12-25 15:33 ` [dpdk-dev] [PATCH 4/7] " Ravi Kerur
2014-12-25 17:44   ` Neil Horman
2014-12-25 19:17     ` Ravi Kerur
2014-12-26 14:42       ` Neil Horman
2014-12-26 15:30         ` Ravi Kerur
2015-01-05 15:59   ` Thomas Monjalon
2015-01-05 16:21     ` Ravi Kerur
2015-01-05 18:56     ` Ravi Kerur
2015-01-05 20:38       ` Thomas Monjalon
2015-01-06 17:35         ` Ravi Kerur
2014-12-25 15:33 ` [dpdk-dev] [PATCH 5/7] " Ravi Kerur
2015-01-05 15:32   ` Thomas Monjalon
2014-12-25 15:33 ` [dpdk-dev] [PATCH 6/7] " Ravi Kerur
2015-01-05 15:49   ` Thomas Monjalon
2014-12-25 15:33 ` [dpdk-dev] [PATCH 7/7] " Ravi Kerur
2014-12-25 17:46   ` Neil Horman
2014-12-25 19:22     ` Ravi Kerur
2014-12-26 14:44       ` Neil Horman
2014-12-26 15:28         ` Ravi Kerur
2014-12-29  8:47 ` [dpdk-dev] [PATCH 0/7] " Olivier MATZ
2014-12-29 12:47   ` Neil Horman
2014-12-29 13:16     ` Olivier MATZ
2014-12-29 16:17       ` Neil Horman
2014-12-29 18:43       ` Ravi Kerur
2015-01-04 23:10         ` Ravi Kerur
2015-01-05 12:24           ` Bruce Richardson
2015-01-09  9:50             ` Olivier MATZ

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