From ae75116efdc29bb42f1d99f8c51b5c52965b2413 Mon Sep 17 00:00:00 2001
From: "Suresh E. Warrier" <warrier@linux.vnet.ibm.com>
Date: Wed, 25 Feb 2015 17:23:53 -0600
Subject: [PATCH] powerpc: Export __spin_yield

Export __spin_yield so that the arch_spin_unlock() function can
be invoked from a module. This will be required for modules where
we want to take a lock that is also is acquired in hypervisor
real mode. Because we want to avoid running any lockdep code
(which may not be safe in real mode), this lock needs to be
an arch_spinlock_t instead of a normal spinlock.

Signed-off-by: Suresh Warrier <warrier@linux.vnet.ibm.com>
Acked-by: Paul Mackerras <paulus@samba.org>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
---
 arch/powerpc/lib/locks.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/lib/locks.c b/arch/powerpc/lib/locks.c
index 170a0346f756..f7deebdf3365 100644
--- a/arch/powerpc/lib/locks.c
+++ b/arch/powerpc/lib/locks.c
@@ -41,6 +41,7 @@ void __spin_yield(arch_spinlock_t *lock)
 	plpar_hcall_norets(H_CONFER,
 		get_hard_smp_processor_id(holder_cpu), yield_count);
 }
+EXPORT_SYMBOL_GPL(__spin_yield);
 
 /*
  * Waiting for a read lock or a write lock on a rwlock...