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Re: break_cow and cache flushing

To: Kip Walker <kwalker@broadcom.com>
Subject: Re: break_cow and cache flushing
From: Ralf Baechle <ralf@linux-mips.org>
Date: Thu, 17 Oct 2002 04:04:44 +0200
Cc: linux-mips@linux-mips.org
In-reply-to: <3DADFC0B.81C8C058@broadcom.com>; from kwalker@broadcom.com on Wed, Oct 16, 2002 at 04:53:47PM -0700
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <3DADFC0B.81C8C058@broadcom.com>
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On Wed, Oct 16, 2002 at 04:53:47PM -0700, Kip Walker wrote:

> BUT either my understanding of (1) or (2) is wrong, or 'break_cow' needs
> to do a 'flush_icache_page' when the page is executable.  Consider the
> following (evil) case.

Ok, didn't get hold of Rik but another mm guy.  He agrees that fix is what
should be used.

Coincidentally that also explains a problem the ia64 guys were seeing :-)

  Ralf

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