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

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Message-ID: <20071214004326.GB2735@muc.de>
Date:	Fri, 14 Dec 2007 01:43:26 +0100
From:	Andi Kleen <ak@....de>
To:	Greg KH <gregkh@...e.de>
Cc:	venkatesh.pallipadi@...el.com, ebiederm@...ssion.com,
	rdreier@...co.com, torvalds@...ux-foundation.org,
	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

On Thu, Dec 13, 2007 at 04:19:32PM -0800, Greg KH wrote:
> On Thu, Dec 13, 2007 at 03:55:51PM -0800, venkatesh.pallipadi@...el.com wrote:
> > 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 ;-)
> 
> Woah!  No, no ioctls on sysfs files, sorry.  Not going to happen, do
> this on a /dev file if you want to have ioctls...

That would require putting the whole PCI bus hierarchy into /dev.
We could do that, but for what would we still need /sys then ? @)

Anyways if you can suggest a better interface please do, but please think first.

-Andi
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