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Subject[PATCH v6 03/46] percpu_rwlock: Provide a way to define and init percpu-rwlocks at compile time
Date
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@redhat.com>
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.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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