From: "H. Peter Anvin" <hpa@zytor.com>
To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
David Airlie <airlied@linux.ie>,
dri-devel@lists.freedesktop.org
Subject: MTRR use in drivers
Date: Thu, 20 Jun 2013 22:00:42 -0700 [thread overview]
Message-ID: <51C3DDFA.7050204@zytor.com> (raw)
An awful lot of drivers, mostly DRI drivers, are still mucking with
MTRRs directly as opposed to using ioremap_wc() or similar interfaces.
In addition to the architecture dependency, this is really undesirable
because MTRRs are a limited resource, whereas page table attributes are not.
Furthermore, this perpetuates the need for the horrific hack known as
"MTRR cleanup".
What, if anything, can we do to clean up this mess?
-hpa
next reply other threads:[~2013-06-21 5:03 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-21 5:00 H. Peter Anvin [this message]
2013-06-23 6:35 ` MTRR use in drivers Brice Goglin
2013-06-23 14:07 ` H. Peter Anvin
2013-06-23 19:29 ` Henrique de Moraes Holschuh
2013-06-23 20:02 ` H. Peter Anvin
2013-06-23 20:30 ` Dave Airlie
2013-06-23 20:38 ` H. Peter Anvin
2013-06-23 20:54 ` Dave Airlie
2013-06-23 20:58 ` H. Peter Anvin
2013-06-23 21:27 ` Dave Airlie
2013-06-23 23:09 ` Andy Lutomirski
2013-06-23 21:56 ` Henrique de Moraes Holschuh
2013-06-23 22:10 ` H. Peter Anvin
2013-06-24 0:02 ` Henrique de Moraes Holschuh
2013-06-24 0:31 ` H. Peter Anvin
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