diff options
| author | Paul E. McKenney <paul.mckenney@linaro.org> | 2012-01-12 13:49:19 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2012-02-21 09:03:46 -0800 |
| commit | 50406b98b6372e7de21d903d2cf3914e9d64e094 (patch) | |
| tree | d53077fbca12714e1af5f9982e08efb923a550c6 /include/linux/rcupdate.h | |
| parent | c44e2cddacc2cf299186bad5697d738ea19668b7 (diff) | |
| download | lwn-50406b98b6372e7de21d903d2cf3914e9d64e094.tar.gz lwn-50406b98b6372e7de21d903d2cf3914e9d64e094.zip | |
rcu: Make rcu_sleep_check() also check rcu_lock_map
Although it is OK to be preempted in an RCU read-side critical section
for TREE_PREEMPT_RCU, it is definitely not OK to be preempted, block,
or might_sleep() within an RCU read-side critical section for TREE_RCU.
Unfortunately, rcu_might_sleep() currently only checks for RCU-bh and
RCU-sched read-side critical sections. This commit therefore makes
rcu_might_sleep() check for RCU read-side critical sections, but only
in TREE_RCU builds.
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'include/linux/rcupdate.h')
| -rw-r--r-- | include/linux/rcupdate.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h index a67d5f1072ea..6df0ae197810 100644 --- a/include/linux/rcupdate.h +++ b/include/linux/rcupdate.h @@ -381,8 +381,22 @@ extern int rcu_my_thread_group_empty(void); } \ } while (0) +#if defined(CONFIG_PROVE_RCU) && !defined(CONFIG_PREEMPT_RCU) +static inline void rcu_preempt_sleep_check(void) +{ + rcu_lockdep_assert(!lock_is_held(&rcu_lock_map), + "Illegal context switch in RCU read-side " + "critical section"); +} +#else /* #ifdef CONFIG_PROVE_RCU */ +static inline void rcu_preempt_sleep_check(void) +{ +} +#endif /* #else #ifdef CONFIG_PROVE_RCU */ + #define rcu_sleep_check() \ do { \ + rcu_preempt_sleep_check(); \ rcu_lockdep_assert(!lock_is_held(&rcu_bh_lock_map), \ "Illegal context switch in RCU-bh" \ " read-side critical section"); \ |