linux-kernel - [PATCH 3.14 15/20] lib/checksum.c: fix build for generic csum_tcpudp

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Date:	Mon,  9 Feb 2015 16:34:07 +0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, kbuild test robot <fengguang.wu@...el.com>,
	Karl Beldan <karl.beldan@...ierawaves.com>,
	Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH 3.14 15/20] lib/checksum.c: fix build for generic csum_tcpudp_nofold

3.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: karl beldan <karl.beldan@...il.com>

commit 9ce357795ef208faa0d59894d9d119a7434e37f3 upstream.

Fixed commit added from64to32 under _#ifndef do_csum_ but used it
under _#ifndef csum_tcpudp_nofold_, breaking some builds (Fengguang's
robot reported TILEGX's). Move from64to32 under the latter.

Fixes: 150ae0e94634 ("lib/checksum.c: fix carry in csum_tcpudp_nofold")
Reported-by: kbuild test robot <fengguang.wu@...el.com>
Signed-off-by: Karl Beldan <karl.beldan@...ierawaves.com>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: David S. Miller <davem@...emloft.net>
Signed-off-by: David S. Miller <davem@...emloft.net>
Cc: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 lib/checksum.c |   18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

--- a/lib/checksum.c
+++ b/lib/checksum.c
@@ -47,15 +47,6 @@ static inline unsigned short from32to16(
 	return x;
 }
 
-static inline u32 from64to32(u64 x)
-{
-	/* add up 32-bit and 32-bit for 32+c bit */
-	x = (x & 0xffffffff) + (x >> 32);
-	/* add up carry.. */
-	x = (x & 0xffffffff) + (x >> 32);
-	return (u32)x;
-}
-
 static unsigned int do_csum(const unsigned char *buff, int len)
 {
 	int odd;
@@ -190,6 +181,15 @@ csum_partial_copy(const void *src, void
 EXPORT_SYMBOL(csum_partial_copy);
 
 #ifndef csum_tcpudp_nofold
+static inline u32 from64to32(u64 x)
+{
+	/* add up 32-bit and 32-bit for 32+c bit */
+	x = (x & 0xffffffff) + (x >> 32);
+	/* add up carry.. */
+	x = (x & 0xffffffff) + (x >> 32);
+	return (u32)x;
+}
+
 __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
 			unsigned short len,
 			unsigned short proto,


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