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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2010-03-03 16:46:56 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-03-04 11:46:14 +0100 |
| commit | db1466b3e1bd1727375cdbfcbea4bcce2f860f61 (patch) | |
| tree | e56e8d7b82f8851e570d95f531ec62e4d107967a /include | |
| parent | Merge branches 'core/futexes' and 'core/iommu' into core/urgent (diff) | |
| download | linux-db1466b3e1bd1727375cdbfcbea4bcce2f860f61.tar.xz linux-db1466b3e1bd1727375cdbfcbea4bcce2f860f61.zip | |
rcu: Use wrapper function instead of exporting tasklist_lock
Lockdep-RCU commit d11c563d exported tasklist_lock, which is not
a good thing. This patch instead exports a function that uses
lockdep to check whether tasklist_lock is held.
Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: mathieu.desnoyers@polymtl.ca
Cc: josh@joshtriplett.org
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
Cc: Valdis.Kletnieks@vt.edu
Cc: dhowells@redhat.com
Cc: Christoph Hellwig <hch@lst.de>
LKML-Reference: <1267631219-8713-1-git-send-email-paulmck@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/cred.h | 2 | ||||
| -rw-r--r-- | include/linux/sched.h | 4 |
2 files changed, 5 insertions, 1 deletions
diff --git a/include/linux/cred.h b/include/linux/cred.h index 4db09f89b637..52507c3e1387 100644 --- a/include/linux/cred.h +++ b/include/linux/cred.h @@ -280,7 +280,7 @@ static inline void put_cred(const struct cred *_cred) * task or by holding tasklist_lock to prevent it from being unlinked. */ #define __task_cred(task) \ - ((const struct cred *)(rcu_dereference_check((task)->real_cred, rcu_read_lock_held() || lockdep_is_held(&tasklist_lock)))) + ((const struct cred *)(rcu_dereference_check((task)->real_cred, rcu_read_lock_held() || lockdep_tasklist_lock_is_held()))) /** * get_task_cred - Get another task's objective credentials diff --git a/include/linux/sched.h b/include/linux/sched.h index 0eef87b58ea5..a47af2064dcc 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -258,6 +258,10 @@ extern spinlock_t mmlist_lock; struct task_struct; +#ifdef CONFIG_PROVE_RCU +extern int lockdep_tasklist_lock_is_held(void); +#endif /* #ifdef CONFIG_PROVE_RCU */ + extern void sched_init(void); extern void sched_init_smp(void); extern asmlinkage void schedule_tail(struct task_struct *prev); |