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authorEric Dumazet <eric.dumazet@gmail.com>2010-09-15 07:07:15 -0400
committerDavid S. Miller <davem@davemloft.net>2010-09-15 22:29:45 -0400
commit7dff59efbb0e8b0f81c95fd40379c0d0c757c808 (patch)
tree17651e0f5ef9b4a4b00352b52351a3fc23ac4671 /include/linux/rtnetlink.h
parente0de7c93b950b9e784894efc4b529c6958cb747a (diff)
net: add rtnl_dereference()
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>
Diffstat (limited to 'include/linux/rtnetlink.h')
-rw-r--r--include/linux/rtnetlink.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index 263690d991a8..68c436bddc88 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -760,6 +760,15 @@ extern int lockdep_rtnl_is_held(void);
760 rcu_dereference_check(p, rcu_read_lock_held() || \ 760 rcu_dereference_check(p, rcu_read_lock_held() || \
761 lockdep_rtnl_is_held()) 761 lockdep_rtnl_is_held())
762 762
763/**
764 * rtnl_dereference - rcu_dereference with debug checking
765 * @p: The pointer to read, prior to dereferencing
766 *
767 * Do an rcu_dereference(p), but check caller holds RTNL
768 */
769#define rtnl_dereference(p) \
770 rcu_dereference_check(p, lockdep_rtnl_is_held())
771
763extern void rtnetlink_init(void); 772extern void rtnetlink_init(void);
764extern void __rtnl_unlock(void); 773extern void __rtnl_unlock(void);
765 774