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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2010-09-15 11:07:15 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-09-15 19:29:45 -0700 |
| commit | 7dff59efbb0e8b0f81c95fd40379c0d0c757c808 (patch) | |
| tree | 17651e0f5ef9b4a4b00352b52351a3fc23ac4671 /include/linux/rtnetlink.h | |
| parent | e0de7c93b950b9e784894efc4b529c6958cb747a (diff) | |
| download | linux-7dff59efbb0e8b0f81c95fd40379c0d0c757c808.tar.gz linux-7dff59efbb0e8b0f81c95fd40379c0d0c757c808.tar.bz2 linux-7dff59efbb0e8b0f81c95fd40379c0d0c757c808.zip | |
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.h | 9 |
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); 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); |