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

To: Ralf Baechle <>
Subject: Re: [PATCH 9/9] tracing: MIPS: cleanup of the address space checking
From: David Daney <>
Date: Thu, 13 May 2010 09:17:13 -0700
Cc: Wu Zhangjin <>, linux-mips <>
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On 05/13/2010 09:13 AM, Ralf Baechle wrote:
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 ;-)

Well it was mostly a rhetorical point. Of course -msym32 is not universal, but it is more common than not I would say. Because of that, we should take a few more minutes and figure out how to make ftrace work well with it.

David Daney

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