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[4/4] Squelch compiler warning in sk_rmem_schedule()

Message ID 1346779479-1097-5-git-send-email-mgorman@suse.de
State Not Applicable, archived
Delegated to: David Miller
Headers show

Commit Message

Mel Gorman Sept. 4, 2012, 5:24 p.m. UTC 
From: Chuck Lever <chuck.lever@oracle.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@oracle.com>
Signed-off-by: Mel Gorman <mgorman@suse.de>
---
 include/net/sock.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

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;