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Re: Possible shared mapping bug in 2.4.23 (at least MIPS/Sparc)

To: Peter Horton <pdh@colonel-panic.org>
Subject: Re: Possible shared mapping bug in 2.4.23 (at least MIPS/Sparc)
From: Jamie Lokier <jamie@shareable.org>
Date: Sat, 13 Dec 2003 22:26:26 +0000
Cc: linux-mips@linux-mips.org, linux-kernel@vger.kernel.org
In-reply-to: <20031213114134.GA9896@skeleton-jack>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <20031213114134.GA9896@skeleton-jack>
Sender: linux-mips-bounce@linux-mips.org
User-agent: Mutt/1.4.1i
Peter Horton wrote:
> A quick look at sparc and sparc64 seem to show the same problem.

D-cache incoherence with unsuitably aligned multiple MAP_FIXED
mappings is also observed on SH4, SH5, PA-RISC 1.1d.  The kernel may
have the same behaviour on those platforms: allowing a mapping that
should not be allowed.

On some ARM and m68k boxes, incoherence is observed independent of
alignment, for multiple mappings of a page in the same user memory
space.

-- Jamie


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