linux-kernel - [PATCH] tcp: fix tcp_fastopen unaligned access complaints on sparc

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Date:   Thu, 12 Jan 2017 11:59:17 -0800
From:   Shannon Nelson <shannon.nelson@...cle.com>
To:     netdev@...r.kernel.org, davem@...emloft.net
Cc:     sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org,
        Shannon Nelson <shannon.nelson@...cle.com>
Subject: [PATCH] tcp: fix tcp_fastopen unaligned access complaints on sparc

Fix up a data alignment issue on sparc by swapping the order
of the cookie byte array field with the length field in
struct tcp_fastopen_cookie

This addresses log complaints like these:
    log_unaligned: 113 callbacks suppressed
    Kernel unaligned access at TPC[976490] tcp_try_fastopen+0x2d0/0x360
    Kernel unaligned access at TPC[9764ac] tcp_try_fastopen+0x2ec/0x360
    Kernel unaligned access at TPC[9764c8] tcp_try_fastopen+0x308/0x360
    Kernel unaligned access at TPC[9764e4] tcp_try_fastopen+0x324/0x360
    Kernel unaligned access at TPC[976490] tcp_try_fastopen+0x2d0/0x360

Signed-off-by: Shannon Nelson <shannon.nelson@...cle.com>
---
 include/linux/tcp.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index fc5848d..95cda75 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -62,8 +62,8 @@ static inline unsigned int tcp_optlen(const struct sk_buff *skb)
 
 /* TCP Fast Open Cookie as stored in memory */
 struct tcp_fastopen_cookie {
-	s8	len;
 	u8	val[TCP_FASTOPEN_COOKIE_MAX];
+	s8	len;
 	bool	exp;	/* In RFC6994 experimental option format */
 };
 
-- 
1.7.1