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Date: Tue, 13 Feb 2001 19:53:11 +0900 (JST)
Message-Id: <200102131053.TAA11808@mule.m17n.org>
From: NIIBE Yutaka <gniibe@m17n.org>
To: Russell King <rmk@arm.linux.org.uk>
Cc: marcelo@conectiva.com.br (Marcelo Tosatti),
        torvalds@transmeta.com (Linus Torvalds),
        alan@lxorguk.ukuu.org.uk (Alan Cox),
        linux-kernel@vger.kernel.org (lkml)
Subject: Re: [PATCH] swapin flush cache bug
In-Reply-To: <200102130950.f1D9ohq01768@flint.arm.linux.org.uk>
In-Reply-To: <Pine.LNX.4.21.0102122107550.29855-100000@freak.distro.conectiva>
	<200102130950.f1D9ohq01768@flint.arm.linux.org.uk>
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Russell King wrote:
 > What was the problem?  The old code seems to behave well on a virtual
 > address indexed virtual address tagged cache.

My case (SH-4) is: virtual address indexed, physical address tagged cache
(which has alias issue).

Suppose there's I/O to the physical page P asynchronously, and the
page is placed in the swap cache.  It remains cache entry, say,
indexed kernel virtual address K.  Then, process maps P at U.  U and K
(may) indexes differently.  The process will get the data from memory
(not the one in the cashe), if it's not flushed.
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