Commit ae75116e authored Feb 25, 2015 by Suresh E. Warrier Committed by Alexander Graf Apr 21, 2015

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>

parent b79013b2

arch/powerpc/lib/locks.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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...

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