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net: add rtnl_dereference()

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We sometime want to dereference an rcu protected pointer while
holding RTNL. Use a macro to hide all lockdep details.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2010-09-15 11:07:15 +00:00 committed by David S. Miller
parent e0de7c93b9
commit 7dff59efbb
1 changed files with 9 additions and 0 deletions
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9
include/linux/rtnetlink.h
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@ -760,6 +760,15 @@ extern int lockdep_rtnl_is_held(void);
rcu_dereference_check(p, rcu_read_lock_held() || \
lockdep_rtnl_is_held())
/**
* rtnl_dereference - rcu_dereference with debug checking
* @p: The pointer to read, prior to dereferencing
*
* Do an rcu_dereference(p), but check caller holds RTNL
*/
#define rtnl_dereference(p) \
rcu_dereference_check(p, lockdep_rtnl_is_held())
extern void rtnetlink_init(void);
extern void __rtnl_unlock(void);