[dpdk-stable] patch 'eal: explicit cast in rwlock functions' has been queued to stable release 18.02.2

[luca.boccassi at gmail.com]

Hi,

FYI, your patch has been queued to stable release 18.02.2

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 05/25/18. So please
shout if anyone has objections.

Thanks.

Luca Boccassi

---
>From 9eb018ee6f675c01856295ee94c2740b89e605b4 Mon Sep 17 00:00:00 2001
From: Andy Green <andy at warmcat.com>
Date: Tue, 22 May 2018 09:24:17 +0800
Subject: [PATCH] eal: explicit cast in rwlock functions

[ upstream commit 1587d36e22d0cf0e037a104e1e851acefd6597f0 ]

GCC 8.1 warned:

In function 'rte_rwlock_read_lock':
rte_rwlock.h:74:12: warning: conversion to 'uint32_t'
{aka 'unsigned int'} from 'int32_t' {aka 'int'} may
change the sign of the result [-Wsign-conversion]
            x, x + 1);
            ^
rte_rwlock.h:74:17: warning: conversion to 'uint32_t'
{aka 'unsigned int'} from 'int' may change the sign
of the result [-Wsign-conversion]
            x, x + 1);
               ~~^~~

In function 'rte_rwlock_write_lock':
rte_rwlock.h:110:15: warning: unsigned conversion
from 'int' to 'uint32_t' {aka 'unsigned int'}
changes value from '-1' to '4294967295' [-Wsign-conversion]
            0, -1);
               ^~

Again in this case we are making explicit the exact cast
that was always happening implicitly.  The patch does not
change the generated code.

The int32_t temp "x" is required to be signed to detect
a < 0 error condition from the lock status.  Afterwards,
it has always been implicitly cast to uint32_t when it
is used in the arguments to rte_atomic32_cmpset()...
gcc8.1 objects to the implicit cast now and requires us
to cast it explicitly.

Fixes: af75078fec ("first public release")

Signed-off-by: Andy Green <andy at warmcat.com>
Acked-by: Bruce Richardson <bruce.richardson at intel.com>
---
 lib/librte_eal/common/include/generic/rte_rwlock.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/librte_eal/common/include/generic/rte_rwlock.h b/lib/librte_eal/common/include/generic/rte_rwlock.h
index 899e9bc43..5751a0e6d 100644
--- a/lib/librte_eal/common/include/generic/rte_rwlock.h
+++ b/lib/librte_eal/common/include/generic/rte_rwlock.h
@@ -71,7 +71,7 @@ rte_rwlock_read_lock(rte_rwlock_t *rwl)
 			continue;
 		}
 		success = rte_atomic32_cmpset((volatile uint32_t *)&rwl->cnt,
-					      x, x + 1);
+					      (uint32_t)x, (uint32_t)(x + 1));
 	}
 }
 
@@ -107,7 +107,7 @@ rte_rwlock_write_lock(rte_rwlock_t *rwl)
 			continue;
 		}
 		success = rte_atomic32_cmpset((volatile uint32_t *)&rwl->cnt,
-					      0, -1);
+					      0, (uint32_t)-1);
 	}
 }
 
-- 
2.14.2