From: Pierre Ossman <drzeus-list@drzeus.cx>
To: LKML <linux-kernel@vger.kernel.org>, linux-mm@kvack.org
Subject: Re: How to alloc highmem page below 4GB on i386?
Date: Fri, 4 Jul 2008 19:58:00 +0200 [thread overview]
Message-ID: <20080704195800.4ef6e00a@mjolnir.drzeus.cx> (raw)
In-Reply-To: <20080630200323.2a5992cd@mjolnir.drzeus.cx>
[-- Attachment #1: Type: text/plain, Size: 898 bytes --]
On Mon, 30 Jun 2008 20:03:23 +0200
Pierre Ossman <drzeus-list@drzeus.cx> wrote:
> Simple question. How do I allocate a page from highmem, that's still
> within 32 bits? x86_64 has the DMA32 zone, but i386 has just HIGHMEM.
> As most devices can't DMA above 32 bit, I have 3 GB of memory that's
> not getting decent usage (or results in needless bouncing). What to do?
>
> I tried just enabling CONFIG_DMA32 for i386, but there is some guard
> against too many memory zones. I'm assuming this is there for a good
> reason?
>
Anyone?
--
-- Pierre Ossman
Linux kernel, MMC maintainer http://www.kernel.org
rdesktop, core developer http://www.rdesktop.org
WARNING: This correspondence is being monitored by the
Swedish government. Make sure your server uses encryption
for SMTP traffic and consider using PGP for end-to-end
encryption.
[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 197 bytes --]
next prev parent reply other threads:[~2008-07-04 17:58 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-30 18:03 Pierre Ossman
2008-07-04 17:58 ` Pierre Ossman [this message]
2008-07-04 18:12 ` Arjan van de Ven
2008-07-04 20:23 ` Pierre Ossman
2008-07-04 20:37 ` Arjan van de Ven
2008-07-04 22:02 ` Pierre Ossman
2008-07-04 22:24 ` Arjan van de Ven
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20080704195800.4ef6e00a@mjolnir.drzeus.cx \
--to=drzeus-list@drzeus.cx \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox