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Re: [PATCH 9/9] tracing: MIPS: cleanup of the address space checking

To: David Daney <david.s.daney@gmail.com>
Subject: Re: [PATCH 9/9] tracing: MIPS: cleanup of the address space checking
From: Ralf Baechle <ralf@linux-mips.org>
Date: Thu, 13 May 2010 17:13:57 +0100
Cc: Wu Zhangjin <wuzhangjin@gmail.com>, linux-mips <linux-mips@linux-mips.org>
In-reply-to: <4BEAE19D.40502@gmail.com>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <cover.1273669419.git.wuzhangjin@gmail.com> <86404e31ca5c4c33b785bad7f6223ac775f4f879.1273669419.git.wuzhangjin@gmail.com> <4BEAE19D.40502@gmail.com>
Sender: linux-mips-bounce@linux-mips.org
User-agent: Mutt/1.5.20 (2009-08-17)
On Wed, May 12, 2010 at 10:13:01AM -0700, David Daney wrote:

> The kernel is always compiled with -msym32, so the patch is a bit pointless.

Not quite true.  Some systems only have enough memory for the exception
vectors in the low 512MB of physical address space, so these can't use
an -msym32 kernel.

My general impression is that hardware designers "design" address maps by
throwing darts over their shoulder after a few pints ;-)

  Ralf

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