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Re: Aliasing in pgtable-bits.h (CONFIG_64BIT_PHYS_ADDR)

To: Ralf Baechle <ralf@linux-mips.org>
Subject: Re: Aliasing in pgtable-bits.h (CONFIG_64BIT_PHYS_ADDR)
From: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>
Date: Wed, 9 Apr 2003 12:12:28 +0200 (MET DST)
Cc: Hartvig Ekner <hartvig@ekner.info>, Linux MIPS mailing list <linux-mips@linux-mips.org>
In-reply-to: <20030408234735.A7363@linux-mips.org>
Organization: Technical University of Gdansk
Original-recipient: rfc822;linux-mips@linux-mips.org
Sender: linux-mips-bounce@linux-mips.org
On Tue, 8 Apr 2003, Ralf Baechle wrote:

> > Is the aliasing between R4KBUG & GLOBAL intentional? This is the only 
> > CONFIG case where it
> > is done. Superficially, I can't see R4KBUG used anywhere, so maybe it 
> > doesn't matter. But
> > if R4KBUG truly isn't used, why not consider removing it entirely from all 
> > PTE layouts?
> 
> It's there for a R4000 bug workaround waiting to be finally written by
> somebody ...

 Possibly doing that in the toolchain may be a reasonable alternative. 
Actually wasting say 4 last words for nops on every page unconditionally
when building for the affected processors may be a good approximation of a
workaround for a start. 

-- 
+  Maciej W. Rozycki, Technical University of Gdansk, Poland   +
+--------------------------------------------------------------+
+        e-mail: macro@ds2.pg.gda.pl, PGP key available        +


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