linux-kernel - [PATCH] include/linux/skbuff.h: using '0xffff' instead of '~0U'

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Message-ID: <51A6EBC5.7040601@asianux.com>
Date:	Thu, 30 May 2013 14:03:49 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	edumazet@...gle.com, Pravin Shelar <pshelar@...ira.com>,
	mgorman@...e.de
CC:	David Miller <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>
Subject: [PATCH] include/linux/skbuff.h: using '0xffff' instead of '~0U'


Both 'transport_header' and 'mac_header' are u16, which are never equal
to '~0U'.

So need use '0xffff' instead of '~0U'.

The related warning (with EXTRA_CFLAGS=-W ARCH=m68k for allmodconfig)
  include/linux/skbuff.h:1587:2: warning: comparison is always true due to limited range of data type [-Wtype-limits]
  ...


Signed-off-by: Chen Gang <gang.chen@...anux.com>
---
 include/linux/skbuff.h |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 2e0ced1..03ba058 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1581,7 +1581,7 @@ static inline void skb_set_inner_mac_header(struct sk_buff *skb,
 }
 static inline bool skb_transport_header_was_set(const struct sk_buff *skb)
 {
-	return skb->transport_header != ~0U;
+	return skb->transport_header != 0xffff;
 }
 
 static inline unsigned char *skb_transport_header(const struct sk_buff *skb)
@@ -1624,7 +1624,7 @@ static inline unsigned char *skb_mac_header(const struct sk_buff *skb)
 
 static inline int skb_mac_header_was_set(const struct sk_buff *skb)
 {
-	return skb->mac_header != ~0U;
+	return skb->mac_header != 0xffff;
 }
 
 static inline void skb_reset_mac_header(struct sk_buff *skb)
-- 
1.7.7.6
--
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