ppc64: use lockc.c from powerpc/lib

since it is effectively the same as locks.c from ppc64/lib.
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

arch/powerpc/lib/Makefile

@@ -7,10 +7,10 @@ obj-y			:= strcase.o string.o
 obj-$(CONFIG_PPC32)	+= div64.o copy_32.o checksum_32.o
 obj-$(CONFIG_PPC64)	+= memcpy_64.o \
 			   usercopy_64.o sstep.o mem_64.o
-ifeq ($(CONFIG_PPC64),y)
-obj-$(CONFIG_SMP)	+= locks.o
-endif
 endif
 
 obj-$(CONFIG_PPC64)	+= checksum_64.o copypage_64.o copyuser_64.o
 obj-$(CONFIG_PPC_ISERIES) += e2a.o
+ifeq ($(CONFIG_PPC64),y)
+obj-$(CONFIG_SMP)	+= locks.o
+endif

arch/ppc64/lib/Makefile

@@ -5,9 +5,4 @@
 lib-y := string.o strcase.o
 lib-y += memcpy.o usercopy.o
 
-# Lock primitives are defined as no-ops in include/linux/spinlock.h
-# for non-SMP configs. Don't build the real versions.
-
-lib-$(CONFIG_SMP) += locks.o
-
 lib-$(CONFIG_DEBUG_KERNEL) += sstep.o

arch/ppc64/lib/locks.c

-/*
- * Spin and read/write lock operations.
- *
- * Copyright (C) 2001-2004 Paul Mackerras <paulus@au.ibm.com>, IBM
- * Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM
- * Copyright (C) 2002 Dave Engebretsen <engebret@us.ibm.com>, IBM
- *   Rework to support virtual processors
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#include <linux/config.h>
-#include <linux/kernel.h>
-#include <linux/spinlock.h>
-#include <linux/module.h>
-#include <linux/stringify.h>
-#include <asm/hvcall.h>
-#include <asm/iSeries/HvCall.h>
-
-/* waiting for a spinlock... */
-#if defined(CONFIG_PPC_SPLPAR) || defined(CONFIG_PPC_ISERIES)
-
-void __spin_yield(raw_spinlock_t *lock)
-{
-	unsigned int lock_value, holder_cpu, yield_count;
-	struct paca_struct *holder_paca;
-
-	lock_value = lock->slock;
-	if (lock_value == 0)
-		return;
-	holder_cpu = lock_value & 0xffff;
-	BUG_ON(holder_cpu >= NR_CPUS);
-	holder_paca = &paca[holder_cpu];
-	yield_count = holder_paca->lppaca.yield_count;
-	if ((yield_count & 1) == 0)
-		return;		/* virtual cpu is currently running */
-	rmb();
-	if (lock->slock != lock_value)
-		return;		/* something has changed */
-#ifdef CONFIG_PPC_ISERIES
-	HvCall2(HvCallBaseYieldProcessor, HvCall_YieldToProc,
-		((u64)holder_cpu << 32) | yield_count);
-#else
-	plpar_hcall_norets(H_CONFER, get_hard_smp_processor_id(holder_cpu),
-			   yield_count);
-#endif
-}
-
-/*
- * Waiting for a read lock or a write lock on a rwlock...
- * This turns out to be the same for read and write locks, since
- * we only know the holder if it is write-locked.
- */
-void __rw_yield(raw_rwlock_t *rw)
-{
-	int lock_value;
-	unsigned int holder_cpu, yield_count;
-	struct paca_struct *holder_paca;
-
-	lock_value = rw->lock;
-	if (lock_value >= 0)
-		return;		/* no write lock at present */
-	holder_cpu = lock_value & 0xffff;
-	BUG_ON(holder_cpu >= NR_CPUS);
-	holder_paca = &paca[holder_cpu];
-	yield_count = holder_paca->lppaca.yield_count;
-	if ((yield_count & 1) == 0)
-		return;		/* virtual cpu is currently running */
-	rmb();
-	if (rw->lock != lock_value)
-		return;		/* something has changed */
-#ifdef CONFIG_PPC_ISERIES
-	HvCall2(HvCallBaseYieldProcessor, HvCall_YieldToProc,
-		((u64)holder_cpu << 32) | yield_count);
-#else
-	plpar_hcall_norets(H_CONFER, get_hard_smp_processor_id(holder_cpu),
-			   yield_count);
-#endif
-}
-#endif
-
-void __raw_spin_unlock_wait(raw_spinlock_t *lock)
-{
-	while (lock->slock) {
-		HMT_low();
-		if (SHARED_PROCESSOR)
-			__spin_yield(lock);
-	}
-	HMT_medium();
-}
-
-EXPORT_SYMBOL(__raw_spin_unlock_wait);