Commit ecc81e0f authored by Stephen Rothwell's avatar Stephen Rothwell
Browse files

ppc64: use lockc.c from powerpc/lib



since it is effectively the same as locks.c from ppc64/lib.
Signed-off-by: default avatarStephen Rothwell <sfr@canb.auug.org.au>
parent 43f35ec3
......@@ -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
......@@ -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
/*
* 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);
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