From: Paul E. McKenney Date: Fri, 8 Jul 2011 15:08:19 +0000 (-0700) Subject: rcu: Make srcu_read_lock_held() call common lockdep-enabled function X-Git-Tag: next-20110914~19^2~1 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0f0cd2c4c0b4eb4df7cccf79121a4af585c65884;p=karo-tx-linux.git rcu: Make srcu_read_lock_held() call common lockdep-enabled function 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 --- diff --git a/include/linux/srcu.h b/include/linux/srcu.h index fcbaee760234..54a70b75a873 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;