linux-stable/kernel/up.c
Nadav Amit caa759323c smp: Remove smp_call_function() and on_each_cpu() return values
The return value is fixed. Remove it and amend the callers.

[ tglx: Fixup arm/bL_switcher and powerpc/rtas ]

Signed-off-by: Nadav Amit <namit@vmware.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: https://lkml.kernel.org/r/20190613064813.8102-2-namit@vmware.com
2019-06-23 14:26:26 +02:00

110 lines
2.3 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Uniprocessor-only support functions. The counterpart to kernel/smp.c
*/
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/smp.h>
#include <linux/hypervisor.h>
int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
int wait)
{
unsigned long flags;
WARN_ON(cpu != 0);
local_irq_save(flags);
func(info);
local_irq_restore(flags);
return 0;
}
EXPORT_SYMBOL(smp_call_function_single);
int smp_call_function_single_async(int cpu, call_single_data_t *csd)
{
unsigned long flags;
local_irq_save(flags);
csd->func(csd->info);
local_irq_restore(flags);
return 0;
}
EXPORT_SYMBOL(smp_call_function_single_async);
void on_each_cpu(smp_call_func_t func, void *info, int wait)
{
unsigned long flags;
local_irq_save(flags);
func(info);
local_irq_restore(flags);
}
EXPORT_SYMBOL(on_each_cpu);
/*
* Note we still need to test the mask even for UP
* because we actually can get an empty mask from
* code that on SMP might call us without the local
* CPU in the mask.
*/
void on_each_cpu_mask(const struct cpumask *mask,
smp_call_func_t func, void *info, bool wait)
{
unsigned long flags;
if (cpumask_test_cpu(0, mask)) {
local_irq_save(flags);
func(info);
local_irq_restore(flags);
}
}
EXPORT_SYMBOL(on_each_cpu_mask);
/*
* Preemption is disabled here to make sure the cond_func is called under the
* same condtions in UP and SMP.
*/
void on_each_cpu_cond_mask(bool (*cond_func)(int cpu, void *info),
smp_call_func_t func, void *info, bool wait,
gfp_t gfp_flags, const struct cpumask *mask)
{
unsigned long flags;
preempt_disable();
if (cond_func(0, info)) {
local_irq_save(flags);
func(info);
local_irq_restore(flags);
}
preempt_enable();
}
EXPORT_SYMBOL(on_each_cpu_cond_mask);
void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info),
smp_call_func_t func, void *info, bool wait,
gfp_t gfp_flags)
{
on_each_cpu_cond_mask(cond_func, func, info, wait, gfp_flags, NULL);
}
EXPORT_SYMBOL(on_each_cpu_cond);
int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par, bool phys)
{
int ret;
if (cpu != 0)
return -ENXIO;
if (phys)
hypervisor_pin_vcpu(0);
ret = func(par);
if (phys)
hypervisor_pin_vcpu(-1);
return ret;
}
EXPORT_SYMBOL_GPL(smp_call_on_cpu);