linux-kernel - [PATCH] ip_vti: fix sparse warnings for VTI

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Message-Id: <20140611150914.c3cb48bb8a1a760564f5db6e@qrator.net>
Date:	Wed, 11 Jun 2014 15:09:14 +0400
From:	Dmitry Popov <ixaphire@...tor.net>
To:	"David S. Miller" <davem@...emloft.net>,
	Steffen Klassert <steffen.klassert@...unet.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	trivial@...nel.org
Subject: [PATCH] ip_vti: fix sparse warnings for VTI_ISVTI

This patch fixes the following sparse warnings:

net/ipv4/ip_tunnel.c:245:53: warning: restricted __be16 degrades to integer
net/ipv4/ip_vti.c:321:19: warning: incorrect type in assignment (different base types)
net/ipv4/ip_vti.c:321:19:    expected restricted __be16 [addressable] [assigned] [usertype] i_flags
net/ipv4/ip_vti.c:321:19:    got int
net/ipv4/ip_vti.c:447:24: warning: incorrect type in assignment (different base types)
net/ipv4/ip_vti.c:447:24:    expected restricted __be16 [usertype] i_flags
net/ipv4/ip_vti.c:447:24:    got int

Since VTI_ISVTI is always used with ip_tunnel_parm->i_flags (which is __be16),
we can __force cast VTI_ISVTI to __be16 in header file.

Signed-off-by: Dmitry Popov <ixaphire@...tor.net>
---
 include/uapi/linux/if_tunnel.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/uapi/linux/if_tunnel.h b/include/uapi/linux/if_tunnel.h
index aee73d0..3bce9e9 100644
--- a/include/uapi/linux/if_tunnel.h
+++ b/include/uapi/linux/if_tunnel.h
@@ -100,7 +100,7 @@ enum {
 #define IFLA_GRE_MAX	(__IFLA_GRE_MAX - 1)
 
 /* VTI-mode i_flags */
-#define VTI_ISVTI 0x0001
+#define VTI_ISVTI ((__force __be16)0x0001)
 
 enum {
 	IFLA_VTI_UNSPEC,
--
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