From: Benjamin Herrenschmidt <benh@au1.ibm.com>
To: Kumar Gala <galak@kernel.crashing.org>
Cc: PowerPC dev list <linuxppc-dev@ozlabs.org>,
Paul Mackerras <paulus@samba.org>
Subject: Re: TASK_SIZE default 0x80000000 ?
Date: Mon, 08 Oct 2007 07:05:23 +1000 [thread overview]
Message-ID: <1191791123.6392.0.camel@pasglop> (raw)
In-Reply-To: <796C20BF-1592-4F07-B83B-5EA35CADBA01@kernel.crashing.org>
> Can you explain (a) further -- I'm assuming the BAT mapping is 1:1
> for that region?
>
> For (b) it looks like:
> * 40x, 44x, fsl-booke compare against TASK_SIZE in their software
> handlers.
> * 8xx still tests 0x80000000
> * 6xx (603) compares against KERNELBASE
>
> It would seem like we should set the default on 8xx & PReP to
> 0x80000000 and not allow it to be modified since that will break the
> world and for everything else move it to match KERNELBASE. Any
> issues with that?
The proper value is neither :-)
It should be compared against PAGE_OFFSET.
Ben.
next prev parent reply other threads:[~2007-10-07 21:05 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-06 13:36 TASK_SIZE default 0x80000000 ? Kumar Gala
2007-10-06 17:22 ` Dan Malek
2007-10-07 4:06 ` Paul Mackerras
2007-10-07 15:02 ` Kumar Gala
2007-10-07 18:35 ` Dan Malek
2007-10-08 13:31 ` Kumar Gala
2007-10-07 21:05 ` Benjamin Herrenschmidt [this message]
2007-10-08 13:31 ` Kumar Gala
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