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| author |   Jesse Gross <jesse@nicira.com> | 2011-11-19 16:21:37 -0800 |
|---|---|---|
| committer | Jesse Gross <jesse@nicira.com> | 2011-12-03 09:35:08 -0800 |
| commit | b4e16611c4e1cd98765269c8fdaf43f96baa57b1 (patch) | |
| tree | 3ca0f230d24748d51726c7e5bb392529a8d65009 /include | |
| parent | genetlink: Add lockdep_genl_is_held(). (diff) | |
| download | linux-dev-b4e16611c4e1cd98765269c8fdaf43f96baa57b1.tar.xz linux-dev-b4e16611c4e1cd98765269c8fdaf43f96baa57b1.zip | |
genetlink: Add rcu_dereference_genl and genl_dereference.
This adds rcu_dereference_genl and genl_dereference, which are genl
variants of the RTNL functions to enforce proper locking with lockdep
and sparse.
Signed-off-by: Jesse Gross <jesse@nicira.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/genetlink.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/include/linux/genetlink.h b/include/linux/genetlink.h index 59311adfb0e0..73c28dea10ae 100644 --- a/include/linux/genetlink.h +++ b/include/linux/genetlink.h @@ -89,6 +89,27 @@ extern void genl_unlock(void); extern int lockdep_genl_is_held(void); #endif +/** + * rcu_dereference_genl - rcu_dereference with debug checking + * @p: The pointer to read, prior to dereferencing + * + * Do an rcu_dereference(p), but check caller either holds rcu_read_lock() + * or genl mutex. Note : Please prefer genl_dereference() or rcu_dereference() + */ +#define rcu_dereference_genl(p) \ + rcu_dereference_check(p, lockdep_genl_is_held()) + +/** + * genl_dereference - fetch RCU pointer when updates are prevented by genl mutex + * @p: The pointer to read, prior to dereferencing + * + * Return the value of the specified RCU-protected pointer, but omit + * both the smp_read_barrier_depends() and the ACCESS_ONCE(), because + * caller holds genl mutex. + */ +#define genl_dereference(p) \ + rcu_dereference_protected(p, lockdep_genl_is_held()) + #endif /* __KERNEL__ */ #endif /* __LINUX_GENERIC_NETLINK_H */ |