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>

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>
Pravin B Shelar · Jesse Gross
1 parent 263ba61d3b
Showing 2 changed files with 11 additions and 0 deletions Side-by-side Diff
include/linux/genetlink.h
net/netlink/genetlink.c
@@ -85,6 +85,9 @@
 /* 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__ */
  
@@ -33,6 +33,14 @@
 }
 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)
...	...	@@ -85,6 +85,9 @@
85	85	/* All generic netlink requests are serialized by a global lock. */
86	86	extern void genl_lock(void);
87	87	extern void genl_unlock(void);
	88	+#ifdef CONFIG_PROVE_LOCKING
	89	+extern int lockdep_genl_is_held(void);
	90	+#endif
88	91
89	92	#endif /* __KERNEL__ */
90	93
...	...	@@ -33,6 +33,14 @@
33	33	}
34	34	EXPORT_SYMBOL(genl_unlock);
35	35
	36	+#ifdef CONFIG_PROVE_LOCKING
	37	+int lockdep_genl_is_held(void)
	38	+{
	39	+ return lockdep_is_held(&genl_mutex);
	40	+}
	41	+EXPORT_SYMBOL(lockdep_genl_is_held);
	42	+#endif
	43	+
36	44	#define GENL_FAM_TAB_SIZE 16
37	45	#define GENL_FAM_TAB_MASK (GENL_FAM_TAB_SIZE - 1)
38	46