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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2010-02-22 17:04:46 -0800
committerIngo Molnar <mingo@elte.hu>2010-02-25 09:41:00 +0100
commitc26d34a5858f96a564c45048bf5f09319d2abad1 (patch)
tree644941c0005b8ecda4f5af3fd9f9c385f911f146 /include/linux/srcu.h
parent632ee200130899252508c478ad0e808222573fbc (diff)
downloadop-kernel-dev-c26d34a5858f96a564c45048bf5f09319d2abad1.zip
op-kernel-dev-c26d34a5858f96a564c45048bf5f09319d2abad1.tar.gz
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 <eric.dumazet@gmail.com> 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: <1266887105-1528-2-git-send-email-paulmck@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/srcu.h')
-rw-r--r--include/linux/srcu.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/srcu.h b/include/linux/srcu.h
index adbe167..3084f80 100644
--- a/include/linux/srcu.h
+++ b/include/linux/srcu.h
@@ -106,6 +106,14 @@ 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.
*
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