linux-kernel - Re: [tip:locking/urgent] compiler, atomics: Provide READ_ONCE

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Message-ID: <20151014174851.GA5076@gmail.com>
Date:	Wed, 14 Oct 2015 19:48:51 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Andy Lutomirski <luto@...capital.net>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	tip-bot for Andrey Ryabinin <tipbot@...or.com>,
	"linux-tip-commits@...r.kernel.org" 
	<linux-tip-commits@...r.kernel.org>,
	kasan-dev <kasan-dev@...glegroups.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Borislav Petkov <bp@...en8.de>,
	Andrey Ryabinin <aryabinin@...tuozzo.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Sasha Levin <sasha.levin@...cle.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Wolfram Gloger <wmglo@...t.med.uni-muenchen.de>,
	Andrey Konovalov <andreyknvl@...gle.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Alexander Potapenko <glider@...gle.com>
Subject: Re: [tip:locking/urgent] compiler, atomics: Provide
 READ_ONCE_NOCHECK ()


* Peter Zijlstra <peterz@...radead.org> wrote:

> > I'd still rather find a way to just delete get_wchan, but whatever.
> 
> :-)

AFAICS can only do that at the price of slowing down various scheduler functions 
by saving the caller address.

Thanks,

	Ingo
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