2017-12-13 16:19 GMT+08:00 Guo Ren <ren_guo@xxxxxxxxx>:
> On Wed, Dec 13, 2017 at 01:45:02PM +0800, Greentime Hu wrote:
>
>> I think it should be fine if an interruption between mtsr_dsb and
>> tlbop_rwr because this is a optimization by sw.
>
> Fine? When there is an unexpected vaddr in SR_TLB_VPN, tlbop_rwr(*pte) will
> break that vaddr's pfn in the CPU tlb-buffer entry. When linux access the
> vaddr, it will get wrong data unless the entry has been replaced out.
Hi, Guo Ren:
Thanks. I get your point.
It is needed to be protected.
I will fix it in the next version patch.
if (vma->vm_mm == current->active_mm) {
local_irq_save(flags);
__nds32__mtsr_dsb(addr, NDS32_SR_TLB_VPN);
__nds32__tlbop_rwr(*pte);
__nds32__isb();
local_irq_restore(flags);
}
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