| From | "Paul E. McKenney" <> | Subject | [PATCH tip/core/rcu 54/55] rcu: Make srcu_read_lock_held() call common lockdep-enabled function | Date | Tue, 6 Sep 2011 11:00:48 -0700 |
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A common debug_lockdep_rcu_enabled() function is used to check whether RCU lockdep splats should be reported, but srcu_read_lock() does not use it. This commit therefore brings srcu_read_lock_held() up to date.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> --- include/linux/srcu.h | 5 ++++- 1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/include/linux/srcu.h b/include/linux/srcu.h index fcbaee7..54a70b7 100644 --- a/include/linux/srcu.h +++ b/include/linux/srcu.h @@ -84,6 +84,9 @@ long srcu_batches_completed(struct srcu_struct *sp); * this assumes we are in an SRCU read-side critical section unless it can * prove otherwise. * + * Checks debug_lockdep_rcu_enabled() to prevent false positives during boot + * and while lockdep is disabled. + * * Note that if the CPU is in an extended quiescent state, for example, * if the CPU is in dyntick-idle mode, then rcu_read_lock_held() returns * false even if the CPU did an rcu_read_lock(). The reason for this is @@ -96,7 +99,7 @@ long srcu_batches_completed(struct srcu_struct *sp); */ static inline int srcu_read_lock_held(struct srcu_struct *sp) { - if (debug_locks) + if (!debug_lockdep_rcu_enabled()) return lock_is_held(&sp->dep_map); if (rcu_check_extended_qs()) return 0; -- 1.7.3.2
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