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powerpc: Export __spin_yield

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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>
This commit is contained in:
Suresh E. Warrier 2015-02-25 17:23:53 -06:00 committed by Alexander Graf
parent b79013b244
commit ae75116efd
1 changed files with 1 additions and 0 deletions
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arch/powerpc/lib/locks.c
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@ -41,6 +41,7 @@ void __spin_yield(arch_spinlock_t *lock)
plpar_hcall_norets(H_CONFER, plpar_hcall_norets(H_CONFER,
get_hard_smp_processor_id(holder_cpu), yield_count); 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... * Waiting for a read lock or a write lock on a rwlock...