linux-kernel - Re: [PATCH] enable interrupts in user path of page fault.

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Message-ID: <alpine.LFD.0.98.0706071928140.4205@woody.linux-foundation.org>
Date:	Thu, 7 Jun 2007 19:29:35 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Steven Rostedt <rostedt@...dmis.org>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Christoph Hellwig <hch@...radead.org>, Andi Kleen <ak@...e.de>
Subject: Re: [PATCH] enable interrupts in user path of page fault.



On Thu, 7 Jun 2007, Steven Rostedt wrote:
> 
> I didn't realize that userspace was allowed to run with interrupts
> disabled.

It isn't, normally. You *can* try to do it by using iopl(), but it's not 
practical. It's certainly not practical to expect a page fault to not 
enable them again, since we obviously need interrupts enabled just to 
handle any IO. 

So don't worry about it. 

		Linus
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