netdev - [PATCH] netlink: fix gcc -Wconversion compilation warning

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Date:	Mon, 13 Dec 2010 19:05:13 +0200
From:	"Kirill A. Shutsemov" <kirill@...temov.name>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, Pablo Neira Ayuso <pablo@...filter.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Dmitry V. Levin" <ldv@...linux.org>, linux-kernel@...r.kernel.org,
	"Kirill A. Shutemov" <kirill@...temov.name>
Subject: [PATCH] netlink: fix gcc -Wconversion compilation warning

From: Dmitry V. Levin <ldv@...linux.org>

$ cat << EOF | gcc -Wconversion -xc -S -o/dev/null -
unsigned f(void) {return NLMSG_HDRLEN;}
EOF
<stdin>: In function 'f':
<stdin>:3:26: warning: negative integer implicitly converted to unsigned type

Signed-off-by: Dmitry V. Levin <ldv@...linux.org>
Signed-off-by: Kirill A. Shutemov <kirill@...temov.name>
---
 include/linux/netlink.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index 1235669..e2b9e63 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -70,7 +70,7 @@ struct nlmsghdr {
    Check		NLM_F_EXCL
  */
 
-#define NLMSG_ALIGNTO	4
+#define NLMSG_ALIGNTO	4U
 #define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
 #define NLMSG_HDRLEN	 ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
 #define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN))
-- 
1.7.3.3

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