[PATCH 2.4.31-pre1] rwsem-spinlock linkage error

[Mikael Pettersson <mikpe@user.it.uu.se>]

The

Andrew Morton:
  o rwsem: Make rwsems use interrupt disabling spinlocks

change in 2.4.31-pre1 has a typo: one occurrence of spin_unlock() was
changed to spin_unlock_restore() instead of spin_unlock_irqrestore()
as was obviously the intention. Since spin_unlock_restore() doesn't
exist, this results in linkage errors on x86_64 and other archs using
CONFIG_RWSEM_GENERIC_SPINLOCK.

Trival fix below.

Signed-off-by: Mikael Pettersson <mikpe@csd.uu.se>

--- linux-2.4.31-pre1/lib/rwsem-spinlock.c.~1~	2005-04-26 19:12:52.000000000 +0200
+++ linux-2.4.31-pre1/lib/rwsem-spinlock.c	2005-04-26 21:16:05.000000000 +0200
@@ -269,7 +269,7 @@ void fastcall __up_read(struct rw_semaph
 	if (--sem->activity==0 && !list_empty(&sem->wait_list))
 		sem = __rwsem_wake_one_writer(sem);
 
-	spin_unlock_restore(&sem->wait_lock, flags);
+	spin_unlock_irqrestore(&sem->wait_lock, flags);
 
 	rwsemtrace(sem,"Leaving __up_read");
 }