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From: Harman Kalra <hkalra@marvell.com>
To: <stephen@networkplumber.org>, <thomas@monjalon.net>,
	<pbhagavatula@marvell.com>
Cc: <dev@dpdk.org>, Harman Kalra <hkalra@marvell.com>, <stable@dpdk.org>
Subject: [dpdk-stable] [PATCH] eal: fix macros to align value
Date: Wed, 10 Jun 2020 00:47:05 +0530
Message-ID: <1591730225-15300-1-git-send-email-hkalra@marvell.com> (raw)

Found an issue while using RTE_ALIGN_MUL_NEAR with an
expression, like as passed in estimate_tsc_freq().
RTE_ALIGN_MUL_FLOOR resulted in unexpected value in the
above function as division has more precedence over
substraction.

Fixes: 5120203d753f ("eal: add macros to align value to multiple")
Cc: stable@dpdk.org

Signed-off-by: Harman Kalra <hkalra@marvell.com>
---
 lib/librte_eal/include/rte_common.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/librte_eal/include/rte_common.h b/lib/librte_eal/include/rte_common.h
index 0843ce69e..0d834001c 100644
--- a/lib/librte_eal/include/rte_common.h
+++ b/lib/librte_eal/include/rte_common.h
@@ -295,7 +295,7 @@ static void __attribute__((destructor(RTE_PRIO(prio)), used)) func(void)
  * than the first parameter.
  */
 #define RTE_ALIGN_MUL_CEIL(v, mul) \
-	(((v + (typeof(v))(mul) - 1) / ((typeof(v))(mul))) * (typeof(v))(mul))
+	((((v) + (typeof(v))(mul) - 1) / ((typeof(v))(mul))) * (typeof(v))(mul))
 
 /**
  * Macro to align a value to the multiple of given value. The resultant
@@ -303,7 +303,7 @@ static void __attribute__((destructor(RTE_PRIO(prio)), used)) func(void)
  * than the first parameter.
  */
 #define RTE_ALIGN_MUL_FLOOR(v, mul) \
-	((v / ((typeof(v))(mul))) * (typeof(v))(mul))
+	(((v) / ((typeof(v))(mul))) * (typeof(v))(mul))
 
 /**
  * Macro to align value to the nearest multiple of the given value.
@@ -314,7 +314,7 @@ static void __attribute__((destructor(RTE_PRIO(prio)), used)) func(void)
 	({							\
 		typeof(v) ceil = RTE_ALIGN_MUL_CEIL(v, mul);	\
 		typeof(v) floor = RTE_ALIGN_MUL_FLOOR(v, mul);	\
-		(ceil - v) > (v - floor) ? floor : ceil;	\
+		(ceil - (v)) > ((v) - floor) ? floor : ceil;	\
 	})
 
 /**
-- 
2.18.0


             reply	other threads:[~2020-06-09 19:17 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-09 19:17 Harman Kalra [this message]
2020-06-24  8:13 ` Thomas Monjalon
2020-06-24  8:24   ` [dpdk-stable] [EXT] " Harman Kalra
2020-06-24  8:30     ` Thomas Monjalon
2020-06-24 10:02       ` Harman Kalra
2020-06-24 10:20       ` [dpdk-stable] [PATCH v2] " Harman Kalra
2020-07-11  9:44         ` Thomas Monjalon

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