linux-kernel - Re: [PATCH 1/3] Fix COW D-cache aliasing on fork

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Message-Id: <20061019.155939.48528489.davem@davemloft.net>
Date:	Thu, 19 Oct 2006 15:59:39 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	ralf@...ux-mips.org
Cc:	nickpiggin@...oo.com.au, torvalds@...l.org, akpm@...l.org,
	linux-kernel@...r.kernel.org, anemo@....ocn.ne.jp
Subject: Re: [PATCH 1/3] Fix COW D-cache aliasing on fork

From: Ralf Baechle <ralf@...ux-mips.org>
Date: Thu, 19 Oct 2006 19:13:46 +0100

> That would require changing the order of cache flush and tlb flush.
> To keep certain architectures that require a valid translation in
> the TLB the cacheflush has to be done first.  Not sure if those
> architectures need a writeable mapping for dirty cachelines - I
> think hypersparc was one of them.

There just has to be "a mapping" in the TLB so that the L2 cache can
translate the virtual address to a physical one for the writeback to
main memory.
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