linux-kernel - [PATCH 4/4] net,rcu: don't assume the size of struct rcu

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Message-ID: <4D6CA860.3020409@cn.fujitsu.com>
Date:	Tue, 01 Mar 2011 16:03:44 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...nel.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Matt Mackall <mpm@...enic.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH 4/4] net,rcu: don't assume the size of struct rcu_head


struct dst_entry assumes the size of struct rcu_head as 2 * sizeof(long)
and manually adds pads for aligning for "__refcnt".

When the size of struct rcu_head is changed, these manual padding
is wrong. Use __attribute__((aligned (64))) instead.

Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
---
diff --git a/include/net/dst.h b/include/net/dst.h
index 93b0310..4ef6c4a 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -62,8 +62,6 @@ struct dst_entry {
 	struct hh_cache		*hh;
 #ifdef CONFIG_XFRM
 	struct xfrm_state	*xfrm;
-#else
-	void			*__pad1;
 #endif
 	int			(*input)(struct sk_buff*);
 	int			(*output)(struct sk_buff*);
@@ -74,23 +72,18 @@ struct dst_entry {
 
 #ifdef CONFIG_NET_CLS_ROUTE
 	__u32			tclassid;
-#else
-	__u32			__pad2;
 #endif
 
 
 	/*
 	 * Align __refcnt to a 64 bytes alignment
 	 * (L1_CACHE_SIZE would be too much)
-	 */
-#ifdef CONFIG_64BIT
-	long			__pad_to_align_refcnt[1];
-#endif
-	/*
+	 *
 	 * __refcnt wants to be on a different cache line from
 	 * input/output/ops or performance tanks badly
 	 */
-	atomic_t		__refcnt;	/* client references	*/
+	atomic_t		__refcnt	/* client references	*/
+				__attribute__((aligned (64)));
 	int			__use;
 	unsigned long		lastuse;
 	union {
--
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