linux-kernel - Re: [RFC] [PATCH] Pre-emption control for userspace

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Message-ID: <87k3c7bfvn.fsf@rasmusvillemoes.dk>
Date:	Thu, 06 Mar 2014 14:45:00 +0100
From:	Rasmus Villemoes <linux@...musvillemoes.dk>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Khalid Aziz <khalid.aziz@...cle.com>, tglx@...utronix.de,
	Ingo Molnar <mingo@...nel.org>, akpm@...ux-foundation.org,
	andi.kleen@...el.com, rob@...dley.net, viro@...iv.linux.org.uk,
	oleg@...hat.com, venki@...gle.com, linux-kernel@...r.kernel.org
Subject: Re: [RFC] [PATCH] Pre-emption control for userspace

Peter Zijlstra <peterz@...radead.org> writes:

> On Thu, Mar 06, 2014 at 02:24:43PM +0100, Rasmus Villemoes wrote:
>> Is it possible to implement non-sleeping versions of {get,put}_user()?
>
> __{get,put}_user()

Huh?

arch/x86/include/asm/uaccess.h:

/**
 * __get_user: - Get a simple variable from user space, with less checking.
 * @x:   Variable to store result.
 * @ptr: Source address, in user space.
 *
 * Context: User context only.  This function may sleep.

What am I missing?

Rasmus

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