linux-kernel - [PATCH v6 03/46] percpu_rwlock: Provide a way to define and init percpu-rwlocks at compile time

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Message-ID: <20130218123850.26245.81751.stgit@srivatsabhat.in.ibm.com>
Date:	Mon, 18 Feb 2013 18:08:50 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	tglx@...utronix.de, peterz@...radead.org, tj@...nel.org,
	oleg@...hat.com, paulmck@...ux.vnet.ibm.com, rusty@...tcorp.com.au,
	mingo@...nel.org, akpm@...ux-foundation.org, namhyung@...nel.org
Cc:	rostedt@...dmis.org, wangyun@...ux.vnet.ibm.com,
	xiaoguangrong@...ux.vnet.ibm.com, rjw@...k.pl, sbw@....edu,
	fweisbec@...il.com, linux@....linux.org.uk,
	nikunj@...ux.vnet.ibm.com, srivatsa.bhat@...ux.vnet.ibm.com,
	linux-pm@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org, netdev@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	walken@...gle.com, vincent.guittot@...aro.org
Subject: [PATCH v6 03/46] percpu_rwlock: Provide a way to define and init
 percpu-rwlocks at compile time

Add the support for defining and initializing percpu-rwlocks at compile time
for those users who would like to use percpu-rwlocks really early in the boot
process (even before dynamic per-CPU allocations can begin).

Cc: David Howells <dhowells@...hat.com>
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
---

 include/linux/percpu-rwlock.h |   15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/include/linux/percpu-rwlock.h b/include/linux/percpu-rwlock.h
index 74eaf4d..5590b1e 100644
--- a/include/linux/percpu-rwlock.h
+++ b/include/linux/percpu-rwlock.h
@@ -49,6 +49,21 @@ extern int __percpu_init_rwlock(struct percpu_rwlock *,
 
 extern void percpu_free_rwlock(struct percpu_rwlock *);
 
+
+#define __PERCPU_RWLOCK_INIT(name)					\
+	{								\
+		.rw_state = &name##_rw_state,				\
+		.global_rwlock = __RW_LOCK_UNLOCKED(name.global_rwlock) \
+	}
+
+#define DEFINE_PERCPU_RWLOCK(name)					\
+	static DEFINE_PER_CPU(struct rw_state, name##_rw_state);	\
+	struct percpu_rwlock (name) = __PERCPU_RWLOCK_INIT(name);
+
+#define DEFINE_STATIC_PERCPU_RWLOCK(name)				\
+	static DEFINE_PER_CPU(struct rw_state, name##_rw_state);	\
+	static struct percpu_rwlock(name) = __PERCPU_RWLOCK_INIT(name);
+
 #define percpu_init_rwlock(pcpu_rwlock)					\
 ({	static struct lock_class_key rwlock_key;			\
 	__percpu_init_rwlock(pcpu_rwlock, #pcpu_rwlock, &rwlock_key);	\

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