diff options
Diffstat (limited to 'arch/powerpc/lib/locks.c')
| -rw-r--r-- | arch/powerpc/lib/locks.c | 36 |
1 files changed, 10 insertions, 26 deletions
diff --git a/arch/powerpc/lib/locks.c b/arch/powerpc/lib/locks.c index bb7cfecf2788..04165b7a163f 100644 --- a/arch/powerpc/lib/locks.c +++ b/arch/powerpc/lib/locks.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * Spin and read/write lock operations. * @@ -5,17 +6,11 @@ * 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/kernel.h> #include <linux/spinlock.h> #include <linux/export.h> -#include <linux/stringify.h> #include <linux/smp.h> /* waiting for a spinlock... */ @@ -23,7 +18,7 @@ #include <asm/hvcall.h> #include <asm/smp.h> -void __spin_yield(arch_spinlock_t *lock) +void splpar_spin_yield(arch_spinlock_t *lock) { unsigned int lock_value, holder_cpu, yield_count; @@ -32,22 +27,23 @@ void __spin_yield(arch_spinlock_t *lock) return; holder_cpu = lock_value & 0xffff; BUG_ON(holder_cpu >= NR_CPUS); - yield_count = lppaca_of(holder_cpu).yield_count; + + yield_count = yield_count_of(holder_cpu); if ((yield_count & 1) == 0) return; /* virtual cpu is currently running */ rmb(); if (lock->slock != lock_value) return; /* something has changed */ - plpar_hcall_norets(H_CONFER, - get_hard_smp_processor_id(holder_cpu), yield_count); + yield_to_preempted(holder_cpu, yield_count); } +EXPORT_SYMBOL_GPL(splpar_spin_yield); /* * 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(arch_rwlock_t *rw) +void splpar_rw_yield(arch_rwlock_t *rw) { int lock_value; unsigned int holder_cpu, yield_count; @@ -57,25 +53,13 @@ void __rw_yield(arch_rwlock_t *rw) return; /* no write lock at present */ holder_cpu = lock_value & 0xffff; BUG_ON(holder_cpu >= NR_CPUS); - yield_count = lppaca_of(holder_cpu).yield_count; + + yield_count = yield_count_of(holder_cpu); if ((yield_count & 1) == 0) return; /* virtual cpu is currently running */ rmb(); if (rw->lock != lock_value) return; /* something has changed */ - plpar_hcall_norets(H_CONFER, - get_hard_smp_processor_id(holder_cpu), yield_count); + yield_to_preempted(holder_cpu, yield_count); } #endif - -void arch_spin_unlock_wait(arch_spinlock_t *lock) -{ - while (lock->slock) { - HMT_low(); - if (SHARED_PROCESSOR) - __spin_yield(lock); - } - HMT_medium(); -} - -EXPORT_SYMBOL(arch_spin_unlock_wait); |