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| author |   Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2010-02-25 14:06:47 -0800 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2010-02-26 08:20:46 +0100 |
| commit | d9f1bb6ad7fc53c406706f47858dd5ff030b14a3 (patch) | |
| tree | 4af519d68b396e372e6a5afbb5e968de3bacd123 /include/linux/rcupdate.h | |
| parent | rcu: Make lockdep_rcu_dereference() message less alarmist (diff) | |
| download | linux-dev-d9f1bb6ad7fc53c406706f47858dd5ff030b14a3.tar.xz linux-dev-d9f1bb6ad7fc53c406706f47858dd5ff030b14a3.zip | |
rcu: Make rcu_read_lock_sched_held() take boot time into account
Before the scheduler starts, all tasks are non-preemptible by
definition. So, during that time, rcu_read_lock_sched_held()
needs to always return "true". This patch makes that be so.
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
LKML-Reference: <1267135607-7056-2-git-send-email-paulmck@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/rcupdate.h')
| -rw-r--r-- | include/linux/rcupdate.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h index 1a4de31bd7b4..fcea332a8424 100644 --- a/include/linux/rcupdate.h +++ b/include/linux/rcupdate.h @@ -62,6 +62,8 @@ extern int sched_expedited_torture_stats(char *page); /* Internal to kernel */ extern void rcu_init(void); +extern int rcu_scheduler_active; +extern void rcu_scheduler_starting(void); #if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU) #include <linux/rcutree.h> @@ -140,7 +142,7 @@ static inline int rcu_read_lock_sched_held(void) if (debug_locks) lockdep_opinion = lock_is_held(&rcu_sched_lock_map); - return lockdep_opinion || preempt_count() != 0; + return lockdep_opinion || preempt_count() != 0 || !rcu_scheduler_active; } #else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */ |