linux-kernel - Re: [RFC PATCH 08/12] PAT 64b: coherent mmap and sysfs bin ioctl

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Date:	Thu, 13 Dec 2007 20:59:44 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	venkatesh.pallipadi@...el.com
Cc:	ak@....de, ebiederm@...ssion.com, rdreier@...co.com,
	torvalds@...ux-foundation.org, gregkh@...e.de, airlied@...net.ie,
	davej@...hat.com, mingo@...e.hu, tglx@...utronix.de, hpa@...or.com,
	akpm@...ux-foundation.org, arjan@...radead.org,
	jesse.barnes@...el.com, linux-kernel@...r.kernel.org,
	Suresh Siddha <suresh.b.siddha@...el.com>
Subject: Re: [RFC PATCH 08/12] PAT 64b: coherent mmap and sysfs bin ioctl

venkatesh.pallipadi@...el.com writes:

> Forward port of coherent-mmap.patch and sysfs-bin-ioctl.patch to x86 tree.
>
> TBD: Do we need the ioctl interface to sysfs or get the type attribute
> through a different sysfs file. And then actually specify the attribute
> while doing pci_mmap_page_range ;-)

This ioctl is not connected up.  So regardless of the wisdom of ioctls on
sysfs adding the infrastructure and then not using it is broken.

> And when this interface is in place, X server has to use this interface for WC
> mapping.

Eric
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