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genetlink: Add lockdep_genl_is_held(). 

Open vSwitch uses genl_mutex locking to protect datapath
data-structures like flow-table, flow-actions. Following patch adds
lockdep_genl_is_held() which is used for rcu annotation to prove
locking.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>
This commit is contained in:
Pravin B Shelar 2011-11-10 19:14:51 -08:00 committed by Jesse Gross
parent 263ba61d3b
commit 86b1309c7e
2 changed files with 11 additions and 0 deletions
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3
include/linux/genetlink.h
View File

@ -85,6 +85,9 @@ enum {
/* All generic netlink requests are serialized by a global lock. */
extern void genl_lock(void);
extern void genl_unlock(void);
#ifdef CONFIG_PROVE_LOCKING
extern int lockdep_genl_is_held(void);
#endif
#endif /* __KERNEL__ */

8
net/netlink/genetlink.c
View File

@ -33,6 +33,14 @@ void genl_unlock(void)
}
EXPORT_SYMBOL(genl_unlock);
#ifdef CONFIG_PROVE_LOCKING
int lockdep_genl_is_held(void)
{
return lockdep_is_held(&genl_mutex);
}
EXPORT_SYMBOL(lockdep_genl_is_held);
#endif
#define GENL_FAM_TAB_SIZE 16
#define GENL_FAM_TAB_MASK (GENL_FAM_TAB_SIZE - 1)