linux-kernel - Re: [patch 0/3] 2.6.20 fix for PageUptodate memorder problem (try 2)

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Date:	Fri, 09 Feb 2007 12:41:35 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Hugh Dickins <hugh@...itas.com>
Cc:	Nick Piggin <npiggin@...e.de>, Andrew Morton <akpm@...l.org>,
	Linux Memory Management <linux-mm@...ck.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [patch 0/3] 2.6.20 fix for PageUptodate memorder problem (try
	2)


> Fix threaded user page write memory ordering
> 
> Make sure we order the writes to a newly created page
> with the page table update that potentially exposes the
> page to another CPU.
> 
> This is a no-op on any architecture where getting the
> page table spinlock will already do the ordering (notably
> x86), but other architectures can care.


Ah yes, the clear_* ones I knew about as I'm the one who tracked down
that bug on power :-) I though the ones Nick pointed out were different
tho.

Ben.


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