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Re: [bigmem-patch] 4GB with Linux on IA32

To: Kanoj Sarcar <kanoj@google.engr.sgi.com>
Subject: Re: [bigmem-patch] 4GB with Linux on IA32
From: Andrea Arcangeli <andrea@suse.de>
Date: Tue, 17 Aug 1999 01:49:41 +0200 (CEST)
cc: alan@lxorguk.ukuu.org.uk, torvalds@transmeta.com, sct@redhat.com, Gerhard.Wichert@pdb.siemens.de, Winfried.Gerhard@pdb.siemens.de,linux-kernel@vger.rutgers.edu, linux-mm@kvack.org
In-Reply-To: <199908162328.QAA24338@google.engr.sgi.com>
Sender: owner-linux-mm@kvack.org

On Mon, 16 Aug 1999, Kanoj Sarcar wrote:

>I was also talking about drivers which assume that all of memory is
>direct mapped. For example, __va and __pa assume this. There might be 
>other macros/procedures which have the same assumption built in. 
>Basically, anything that is dependent on PAGE_OFFSET needs to be
>checked. 

Only places that may deal with bigmem pages and the core of the kernel
must be checked. I don't exclude there still something to fix (as happened
with kernel/ptrace.c and /proc/*/mem) but with the current design we
shouldn't need to touch the device drivers at all.

The only real problem currently seems to be raw-io to me... (hints?)

Andrea

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References:
- Re: [bigmem-patch] 4GB with Linux on IA32
  - From: kanoj@google.engr.sgi.com (Kanoj Sarcar)

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