Add header and export for rt_write_trylock_irqsave.
Index: linux-2.6.21/include/linux/spinlock.h
===================================================================
--- linux-2.6.21.orig/include/linux/spinlock.h
+++ linux-2.6.21/include/linux/spinlock.h
@@ -294,6 +294,7 @@ do { \
extern void __lockfunc rt_write_lock(rwlock_t *rwlock);
extern void __lockfunc rt_read_lock(rwlock_t *rwlock);
extern int __lockfunc rt_write_trylock(rwlock_t *rwlock);
+extern int __lockfunc rt_write_trylock_irqsave(rwlock_t *trylock);
extern int __lockfunc rt_read_trylock(rwlock_t *rwlock);
extern void __lockfunc rt_write_unlock(rwlock_t *rwlock);
extern void __lockfunc rt_read_unlock(rwlock_t *rwlock);
Index: linux-2.6.21/kernel/rt.c
===================================================================
--- linux-2.6.21.orig/kernel/rt.c
+++ linux-2.6.21/kernel/rt.c
@@ -178,6 +178,7 @@ int __lockfunc rt_write_trylock_irqsave(
*flags = 0;
return rt_write_trylock(rwlock);
}
+EXPORT_SYMBOL(rt_write_trylock_irqsave);
int __lockfunc rt_read_trylock(rwlock_t *rwlock)
{
-
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