linux-kernel - [PATCH v2] rculist: Fix another sparse warning

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Message-ID: <1427347628-9514-1-git-send-email-ying.xue@windriver.com>
Date:	Thu, 26 Mar 2015 13:27:08 +0800
From:	Ying Xue <ying.xue@...driver.com>
To:	<paulmck@...ux.vnet.ibm.com>
CC:	<linux-kernel@...r.kernel.org>
Subject: [PATCH v2] rculist: Fix another sparse warning

This fixes the following sparse warnings:

make C=1 CF=-D__CHECK_ENDIAN__ net/tipc/name_table.o
net/tipc/name_table.c:977:17: error: incompatible types in comparison expression (different address spaces)
net/tipc/name_table.c:977:17: error: incompatible types in comparison expression (different address spaces)

To silence these spare complaints, an RCU annotation should be added to
"next" pointer of hlist_node structure through hlist_next_rcu() macro
when iterating over a hlist with hlist_for_each_entry_from_rcu().

Signed-off-by: Ying Xue <ying.xue@...driver.com>
---
Changes:
 - Replace rcu_dereference_bh() with rcu_dereference_raw() suggested
   by Paul.

 include/linux/rculist.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/rculist.h b/include/linux/rculist.h
index a18b16f..fd1c870 100644
--- a/include/linux/rculist.h
+++ b/include/linux/rculist.h
@@ -549,8 +549,8 @@ static inline void hlist_add_behind_rcu(struct hlist_node *n,
  */
 #define hlist_for_each_entry_from_rcu(pos, member)			\
 	for (; pos;							\
-	     pos = hlist_entry_safe(rcu_dereference((pos)->member.next),\
-			typeof(*(pos)), member))
+	     pos = hlist_entry_safe(rcu_dereference_raw(hlist_next_rcu(	\
+			&(pos)->member)), typeof(*(pos)), member))
 
 #endif	/* __KERNEL__ */
 #endif
-- 
1.7.9.5

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