Re: [PATCH 3/5] mm: powerpc ptlock comments

[Benjamin Herrenschmidt]

On Tue, 2005-11-22 at 07:12 +0000, Hugh Dickins wrote:

> I'd appreciate something that updates the "because" part too, but don't
> know the answer.  That other patch will need to come from your end - Ben?

Hrm... same reason as __hash_page(), the code now locks the PTE using
the _PAGE_BUSY bit. The last store does the update and unlock and
doesn't need to be atomic. However, now that I look at it, it might need
an lwsync. Paul ?

Ben.


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