From c26d34a5858f96a564c45048bf5f09319d2abad1 Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Mon, 22 Feb 2010 17:04:46 -0800 Subject: rcu: Add lockdep-enabled variants of rcu_dereference() Make rcu_dereference() check for being in an RCU read-side critical section, and create rcu_dereference_bh(), rcu_dereference_sched(), and srcu_dereference() to check for the other flavors of RCU. Also create rcu_dereference_raw() to avoid checking, and make rcu_dereference_check() use rcu_dereference_raw(). Acked-by: Eric Dumazet Signed-off-by: Paul E. McKenney 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: <1266887105-1528-2-git-send-email-paulmck@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar --- include/linux/srcu.h | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'include/linux/srcu.h') diff --git a/include/linux/srcu.h b/include/linux/srcu.h index adbe1670b366..3084f80909cd 100644 --- a/include/linux/srcu.h +++ b/include/linux/srcu.h @@ -105,6 +105,14 @@ static inline int srcu_read_lock_held(struct srcu_struct *sp) #endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */ +/** + * srcu_dereference - fetch SRCU-protected pointer with checking + * + * Makes rcu_dereference_check() do the dirty work. + */ +#define srcu_dereference(p, sp) \ + rcu_dereference_check(p, srcu_read_lock_held(sp)) + /** * srcu_read_lock - register a new reader for an SRCU-protected structure. * @sp: srcu_struct in which to register the new reader. -- cgit v1.2.3-70-g09d2