[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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

To: kanoj@google.engr.sgi.com (Kanoj Sarcar)
Subject: Re: [bigmem-patch] 4GB with Linux on IA32
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Date: Tue, 17 Aug 1999 12:46:35 +0100 (BST)
Cc: torvalds@transmeta.com, andrea@suse.de, alan@lxorguk.ukuu.org.uk, 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: <199908170650.XAA95856@google.engr.sgi.com> from "Kanoj Sarcar" at Aug 16, 99 11:50:42 pm
Sender: owner-linux-mm@kvack.org

> I will give you one example of the type of cases that I am talking about.
> In drivers/char/bttv.c, VIDIOCSFBUF ioctl seems to be setting the "vidadr"
> to a kernel virtual address from the physical address present in the 
> user's pte. This will not work for bigmem pages.

Oh now I understand Linus rather bizarre message

VIDIOCSFBUF takes a physical base address. The &1 stuff thats i nthere is 
a debug hook that never got taken out. You can ignore the &1 case in that
ioctl or just remove it.

Alan

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://humbolt.geo.uu.nl/Linux-MM/

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

Prev by Date: Re: [bigmem-patch] 4GB with Linux on IA32
Next by Date: Re: [bigmem-patch] 4GB with Linux on IA32
Prev by thread: Re: [bigmem-patch] 4GB with Linux on IA32
Next by thread: Re: [bigmem-patch] 4GB with Linux on IA32
Index(es):
- Date
- Thread