linux-kernel - Re: Re-tune x86 uaccess code for PREEMPT

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Message-ID: <5206A1FD.4020603@zytor.com>
Date:	Sat, 10 Aug 2013 13:26:37 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Mike Galbraith <bitbucket@...ine.de>,
	Andi Kleen <andi@...stfloor.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: Re-tune x86 uaccess code for PREEMPT_VOLUNTARY

On 08/10/2013 11:51 AM, Linus Torvalds wrote:
> That "kernel_stack" thing is actually getting the thread_info pointer,
> and it doesn't get cached because gcc thinks the preempt_count value
> might alias.

This is just plain braindamaged.  Somewhere on my list of things is to
merge thread_info and task_struct and have a pointer to the unified
structure.

	-hpa

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