Andy Lutomirski <luto@xxxxxxxxxx> wrote:
> index 2a5e851f2035..f06239c6919f 100644
> --- a/arch/x86/mm/tlb.c
> +++ b/arch/x86/mm/tlb.c
> @@ -208,6 +208,9 @@ void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next,
> static void flush_tlb_func_common(const struct flush_tlb_info *f,
> bool local, enum tlb_flush_reason reason)
> {
> + /* This code cannot presently handle being reentered. */
> + VM_WARN_ON(!irqs_disabled());
> +
> if (this_cpu_read(cpu_tlbstate.state) != TLBSTATE_OK) {
> leave_mm(smp_processor_id());
> return;
> @@ -313,8 +316,12 @@ void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
> info.end = TLB_FLUSH_ALL;
> }
>
> - if (mm == this_cpu_read(cpu_tlbstate.loaded_mm))
> + if (mm == this_cpu_read(cpu_tlbstate.loaded_mm)) {
Perhaps you want to add:
VM_WARN_ON(irqs_disabled());
here
> + local_irq_disable();
> flush_tlb_func_local(&info, TLB_LOCAL_MM_SHOOTDOWN);
> + local_irq_enable();
> + }
> +
> if (cpumask_any_but(mm_cpumask(mm), cpu) < nr_cpu_ids)
> flush_tlb_others(mm_cpumask(mm), &info);
> put_cpu();
> @@ -370,8 +377,12 @@ void arch_tlbbatch_flush(struct arch_tlbflush_unmap_batch *batch)
>
> int cpu = get_cpu();
>
> - if (cpumask_test_cpu(cpu, &batch->cpumask))
> + if (cpumask_test_cpu(cpu, &batch->cpumask)) {
and here?
> + local_irq_disable();
> flush_tlb_func_local(&info, TLB_LOCAL_SHOOTDOWN);
> + local_irq_enable();
> + }
> +
> if (cpumask_any_but(&batch->cpumask, cpu) < nr_cpu_ids)
> flush_tlb_others(&batch->cpumask, &info);
> cpumask_clear(&batch->cpumask);
> --
> 2.9.4
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