Re: [PATCH] mm: poison struct page for ptlock

[Andrew Morton]

Hugh Dickins <hugh@xxxxxxxxxxx> wrote:
>
> Suppress split ptlock on arches which may use one page for multiple page
>  tables.  Reconsider what better to do (particularly on ppc64) later on.

But why is that a problem per-se?  A few "pagetable pages" will share the
same lock.  Deadlocky when we take two pagetable locks?

The code ran OK on ppc64, fwiw.

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