linux-kernel - Re: [RFC] Simple userspace interface for PCI drivers

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Message-ID: <20060830220855.GA13554@kroah.com>
Date:	Wed, 30 Aug 2006 15:08:56 -0700
From:	Greg KH <greg@...ah.com>
To:	"linux-os (Dick Johnson)" <linux-os@...logic.com>
Cc:	Matthias Schniedermeyer <ms@...d.de>,
	Matt Porter <mporter@...eddedalley.com>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC] Simple userspace interface for PCI drivers

On Wed, Aug 30, 2006 at 05:25:45PM -0400, linux-os (Dick Johnson) wrote:
> User mode drivers are NOT good. For them to work, too much stuff
> needs to be exposed. Then there is the problem of interrupts.
> You are not going to be able to make an interrupt 'thunker' like
> you could in the old DOS days. The kernel isn't going to call
> user-mode code because nobody is going to provide such a potentially
> destructive interface. If you think you can handle hardware interrupt
> requests with the poll() interface, you are going to be in a world of
> hurt for throughput.

If you feel this way, then don't use them on your system, for your
hardware.
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