Re: [PATCHv2] efi/unaccepted: Fix soft lockups caused by parallel memory acceptance

[Ard Biesheuvel]

On Tue, 17 Oct 2023 at 12:17, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
>
> On Tue, Oct 17, 2023 at 09:42:13AM +0200, Ard Biesheuvel wrote:
>
> > One question I have is whether the sequence
> >
> > spin_lock_irqsave(&unaccepted_memory_lock, flags);
> > ...
> > spin_unlock(&unaccepted_memory_lock);
> > arch_accept_memory(phys_start, phys_end);
> > spin_lock(&unaccepted_memory_lock);
> > ...
> > spin_unlock_irqrestore(&unaccepted_memory_lock, flags);
> >
> > is considered sound and is supported by all architectures?
>
> Yes.

Thanks for the clarification

I've queued this up now (with the cpu_relax() removed)