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Bhat" Subject: [PATCH v5 03/45] percpu_rwlock: Provide a way to define and init percpu-rwlocks at compile time 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 Date: Tue, 22 Jan 2013 13:03:42 +0530 Message-ID: <20130122073338.13822.94829.stgit@srivatsabhat.in.ibm.com> In-Reply-To: <20130122073210.13822.50434.stgit@srivatsabhat.in.ibm.com> References: <20130122073210.13822.50434.stgit@srivatsabhat.in.ibm.com> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13012207-8256-0000-0000-000005EE5458 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130122_023536_152966_5A2C611A X-CRM114-Status: GOOD ( 12.75 ) X-Spam-Score: -1.9 (-) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-1.9 points) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at http://www.dnswl.org/, medium trust [122.248.162.5 listed in list.dnswl.org] 3.0 KHOP_BIG_TO_CC Sent to 10+ recipients instaed of Bcc or a list -0.7 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: linux-arch@vger.kernel.org, linux@arm.linux.org.uk, nikunj@linux.vnet.ibm.com, linux-pm@vger.kernel.org, fweisbec@gmail.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, rostedt@goodmis.org, xiaoguangrong@linux.vnet.ibm.com, rjw@sisk.pl, sbw@mit.edu, wangyun@linux.vnet.ibm.com, srivatsa.bhat@linux.vnet.ibm.com, netdev@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.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 | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/include/linux/percpu-rwlock.h b/include/linux/percpu-rwlock.h index cd5eab5..8dec8fe 100644 --- a/include/linux/percpu-rwlock.h +++ b/include/linux/percpu-rwlock.h @@ -45,6 +45,24 @@ extern int __percpu_init_rwlock(struct percpu_rwlock *, extern void percpu_free_rwlock(struct percpu_rwlock *); + +#define __PERCPU_RWLOCK_INIT(name) \ + { \ + .reader_refcnt = &name##_reader_refcnt, \ + .writer_signal = &name##_writer_signal, \ + .global_rwlock = __RW_LOCK_UNLOCKED(name.global_rwlock) \ + } + +#define DEFINE_PERCPU_RWLOCK(name) \ + static DEFINE_PER_CPU(unsigned long, name##_reader_refcnt); \ + static DEFINE_PER_CPU(bool, name##_writer_signal); \ + struct percpu_rwlock (name) = __PERCPU_RWLOCK_INIT(name); + +#define DEFINE_STATIC_PERCPU_RWLOCK(name) \ + static DEFINE_PER_CPU(unsigned long, name##_reader_refcnt); \ + static DEFINE_PER_CPU(bool, name##_writer_signal); \ + 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); \