linux-kernel - Re: PTE access rules & abstraction

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Message-ID: <Pine.LNX.4.64.0809250049270.21674@blonde.site>
Date:	Thu, 25 Sep 2008 00:55:36 +0100 (BST)
From:	Hugh Dickins <hugh@...itas.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Nick Piggin <npiggin@...e.de>,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: PTE access rules & abstraction

On Thu, 25 Sep 2008, Benjamin Herrenschmidt wrote:
> 
> Now, regarding the above bug, I'm afraid the only approaches I see that
> would work would be to have either a ptep_get_and_clear_flush(), which I
> suppose x86 virt. people will hate, or maybe to actually have a powerpc
> specific variant of the new start/commit hooks that does the flush.

Whyever not the latter?  Jeremy seems to have gifted that to you,
for precisely such a purpose.

Hugh

p.s. I surely agree with you over the name ptep_get_and_clear_full():
horrid, even more confusing than the tlb->fullmm from which it derives
its name.  I expect I'd agree with you over a lot more too, but please,
bugfixes first.
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