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caa759323c
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
110 lines
2.3 KiB
C
110 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Uniprocessor-only support functions. The counterpart to kernel/smp.c
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*/
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/smp.h>
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#include <linux/hypervisor.h>
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int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
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int wait)
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{
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unsigned long flags;
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WARN_ON(cpu != 0);
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local_irq_save(flags);
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func(info);
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local_irq_restore(flags);
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return 0;
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}
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EXPORT_SYMBOL(smp_call_function_single);
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int smp_call_function_single_async(int cpu, call_single_data_t *csd)
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{
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unsigned long flags;
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local_irq_save(flags);
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csd->func(csd->info);
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local_irq_restore(flags);
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return 0;
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}
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EXPORT_SYMBOL(smp_call_function_single_async);
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void on_each_cpu(smp_call_func_t func, void *info, int wait)
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{
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unsigned long flags;
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local_irq_save(flags);
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func(info);
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local_irq_restore(flags);
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}
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EXPORT_SYMBOL(on_each_cpu);
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/*
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* Note we still need to test the mask even for UP
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* because we actually can get an empty mask from
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* code that on SMP might call us without the local
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* CPU in the mask.
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*/
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void on_each_cpu_mask(const struct cpumask *mask,
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smp_call_func_t func, void *info, bool wait)
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{
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unsigned long flags;
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if (cpumask_test_cpu(0, mask)) {
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local_irq_save(flags);
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func(info);
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local_irq_restore(flags);
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}
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}
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EXPORT_SYMBOL(on_each_cpu_mask);
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/*
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* Preemption is disabled here to make sure the cond_func is called under the
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* same condtions in UP and SMP.
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*/
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void on_each_cpu_cond_mask(bool (*cond_func)(int cpu, void *info),
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smp_call_func_t func, void *info, bool wait,
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gfp_t gfp_flags, const struct cpumask *mask)
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{
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unsigned long flags;
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preempt_disable();
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if (cond_func(0, info)) {
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local_irq_save(flags);
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func(info);
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local_irq_restore(flags);
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}
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preempt_enable();
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}
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EXPORT_SYMBOL(on_each_cpu_cond_mask);
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void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info),
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smp_call_func_t func, void *info, bool wait,
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gfp_t gfp_flags)
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{
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on_each_cpu_cond_mask(cond_func, func, info, wait, gfp_flags, NULL);
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}
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EXPORT_SYMBOL(on_each_cpu_cond);
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int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par, bool phys)
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{
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int ret;
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if (cpu != 0)
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return -ENXIO;
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if (phys)
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hypervisor_pin_vcpu(0);
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ret = func(par);
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if (phys)
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hypervisor_pin_vcpu(-1);
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return ret;
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}
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EXPORT_SYMBOL_GPL(smp_call_on_cpu);
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