linux-kernel - [PATCH 4/4] Squelch compiler warning in sk_rmem

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Date:	Tue,  4 Sep 2012 18:24:39 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Linux-MM <linux-mm@...ck.org>,
	Linux-Netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Chuck Lever <chuck.lever@...cle.com>,
	Joonsoo Kim <js1304@...il.com>, Pekka@...e.de,
	"Enberg <penberg"@kernel.org, David Rientjes <rientjes@...gle.com>,
	Mel Gorman <mgorman@...e.de>
Subject: [PATCH 4/4] Squelch compiler warning in sk_rmem_schedule()

From: Chuck Lever <chuck.lever@...cle.com>

In file included from linux/include/linux/tcp.h:227:0,
                 from linux/include/linux/ipv6.h:221,
                 from linux/include/net/ipv6.h:16,
                 from linux/include/linux/sunrpc/clnt.h:26,
                 from linux/net/sunrpc/stats.c:22:
linux/include/net/sock.h: In function ‘sk_rmem_schedule’:
linux/nfs-2.6/include/net/sock.h:1339:13: warning: comparison between
  signed and unsigned integer expressions [-Wsign-compare]

Seen with gcc (GCC) 4.6.3 20120306 (Red Hat 4.6.3-2) using the
-Wextra option.

[c76562b6: netvm: prevent a stream-specific deadlock] accidentally replaced
the "size" parameter of sk_rmem_schedule() with an unsigned int. This
changes the semantics of the comparison in the return statement.

In sk_wmem_schedule we have syntactically the same comparison, but
"size" is a signed integer.  In addition, __sk_mem_schedule() takes
a signed integer for its "size" parameter, so there is an implicit
type conversion in sk_rmem_schedule() anyway.

Revert the "size" parameter back to a signed integer so that the
semantics of the expressions in both sk_[rw]mem_schedule() are
exactly the same.

Signed-off-by: Chuck Lever <chuck.lever@...cle.com>
Signed-off-by: Mel Gorman <mgorman@...e.de>
---
 include/net/sock.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/net/sock.h b/include/net/sock.h
index 72132ae..adb7da2 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1332,7 +1332,7 @@ static inline bool sk_wmem_schedule(struct sock *sk, int size)
 }
 
 static inline bool
-sk_rmem_schedule(struct sock *sk, struct sk_buff *skb, unsigned int size)
+sk_rmem_schedule(struct sock *sk, struct sk_buff *skb, int size)
 {
 	if (!sk_has_account(sk))
 		return true;
-- 
1.7.9.2

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