Re: [PATCH 06/12] x86/mm: Enable and use the arch_pgd_init_late() method

[Oleg Nesterov]

On 06/13, Oleg Nesterov wrote:
>
> Afaics, we need to ensure that:
>
> > +			if (pgd_val(*pgd_src))
> > +				WRITE_ONCE(*pgd_dst, *pgd_src);
>
> either we notice the recent update of this PGD, or (say) the subsequent
> sync_global_pgds() can miss the child.

and perhaps !pgd_none(pgd_src) will look better.

Oleg.

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