From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: linux-kernel@vger.kernel.org
Cc: mingo@elte.hu, laijs@cn.fujitsu.com, dipankar@in.ibm.com,
akpm@linux-foundation.org, mathieu.desnoyers@polymtl.ca,
josh@joshtriplett.org, niv@us.ibm.com, tglx@linutronix.de,
peterz@infradead.org, rostedt@goodmis.org,
Valdis.Kletnieks@vt.edu, dhowells@redhat.com,
eric.dumazet@gmail.com, darren@dvhart.com, patches@linaro.org,
"Paul E. McKenney" <paul.mckenney@linaro.org>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 2/3] atomic: add atomic_or()
Date: Wed, 11 May 2011 13:59:36 -0700 [thread overview]
Message-ID: <1305147577-1812-2-git-send-email-paulmck@linux.vnet.ibm.com> (raw)
In-Reply-To: <20110511205915.GA1731@linux.vnet.ibm.com>
From: Paul E. McKenney <paul.mckenney@linaro.org>
An atomic_or() function is needed by TREE_RCU to avoid deadlock, so
add a generic version.
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---
include/linux/atomic.h | 13 +++++++++++++
1 files changed, 13 insertions(+), 0 deletions(-)
diff --git a/include/linux/atomic.h b/include/linux/atomic.h
index 96c038e..ee456c7 100644
--- a/include/linux/atomic.h
+++ b/include/linux/atomic.h
@@ -34,4 +34,17 @@ static inline int atomic_inc_not_zero_hint(atomic_t *v, int hint)
}
#endif
+#ifndef CONFIG_ARCH_HAS_ATOMIC_OR
+static inline void atomic_or(int i, atomic_t *v)
+{
+ int old;
+ int new;
+
+ do {
+ old = atomic_read(v);
+ new = old | i;
+ } while (atomic_cmpxchg(v, old, new) != old);
+}
+#endif /* #ifndef CONFIG_ARCH_HAS_ATOMIC_OR */
+
#endif /* _LINUX_ATOMIC_H */
--
1.7.3.2
next prev parent reply other threads:[~2011-05-11 20:59 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-11 20:59 [PATCH tip/core/rcu 0/3] Fixes for lockdep and out-of-tree-module build problem Paul E. McKenney
2011-05-11 20:59 ` [PATCH tip/core/rcu 1/3] rcu: avoid build error for third-party modules Paul E. McKenney
2011-05-11 20:59 ` Paul E. McKenney [this message]
2011-05-11 20:59 ` [PATCH tip/core/rcu 3/3] rcu: Avoid acquiring rcu_node locks in timer functions Paul E. McKenney
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