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

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Date:	Thu, 13 Dec 2007 23:04:21 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Greg KH <gregkh@...e.de>
Cc:	venkatesh.pallipadi@...el.com, ak@....de, 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

Greg KH <gregkh@...e.de> writes:

> On Thu, Dec 13, 2007 at 08:59:44PM -0700, Eric W. Biederman wrote:
>> 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.
>
> Ok, I guess the "use an ioctl on a binary file in sysfs for PCI devices"
> makes a bit more sense (hint, next time explain this in the changelog
> instead of just saying that it is being added), but I would like to see
> how this is all hooked up before passing final judgement on it.


The obvious thing to do would be to hook it up like:
drivers/pci/proc.c:proc_bus_pci_ioctl.

Eric
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