From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Srivatsa S. Bhat" Subject: [PATCH v6 03/46] percpu_rwlock: Provide a way to define and init percpu-rwlocks at compile time Date: Mon, 18 Feb 2013 18:08:50 +0530 Message-ID: <20130218123850.26245.81751.stgit@srivatsabhat.in.ibm.com> References: <20130218123714.26245.61816.stgit@srivatsabhat.in.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: rostedt@goodmis.org, wangyun@linux.vnet.ibm.com, xiaoguangrong@linux.vnet.ibm.com, rjw@sisk.pl, sbw@mit.edu, fweisbec@gmail.com, linux@arm.linux.org.uk, nikunj@linux.vnet.ibm.com, srivatsa.bhat@linux.vnet.ibm.com, linux-pm@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, netdev@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, walken@google.com, vincent.guittot@linaro.org To: tglx@linutronix.de, peterz@infradead.org, tj@kernel.org, oleg@redhat.com, paulmck@linux.vnet.ibm.com, rusty@rustcorp.com.au, mingo@kernel.org, akpm@linux-foundation.org, namhyung@kernel.org Return-path: In-Reply-To: <20130218123714.26245.61816.stgit@srivatsabhat.in.ibm.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org 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 Signed-off-by: Srivatsa S. Bhat --- 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); \