linux-kernel - Re: [PATCH v4 1/2] compiler, atomics: Provide READ_ONCE

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Message-ID: <20151018072402.GA15510@gmail.com>
Date:	Sun, 18 Oct 2015 09:24:02 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc:	Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	Andrey Konovalov <andreyknvl@...gle.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	kasan-dev <kasan-dev@...glegroups.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Wolfram Gloger <wmglo@...t.med.uni-muenchen.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v4 1/2] compiler, atomics: Provide READ_ONCE_NOKSAN()


* Andrey Ryabinin <aryabinin@...tuozzo.com> wrote:

> On 10/16/2015 01:33 PM, Borislav Petkov wrote:
> > On Fri, Oct 16, 2015 at 12:44:53PM +0300, Andrey Ryabinin wrote:
> >> Some code may perform racy by design memory reads. This could be
> >> harmless, yet such code may produce KASAN warnings.
> >>
> >> To hide such accesses from KASAN this patch introduces
> >> READ_ONCE_NOKSAN() macro. KASAN will not check the memory
> >> accessed by READ_ONCE_NOKSAN(). The KernelThreadSanitizer (KTSAN)
> >> is going to ignore it as well.
> > 
> > Frankly, the "NOKSAN" suffix is too specific. I know, I know, I'm
> > bikeshedding but what happens if yet another tool wants to be disabled
> > from checking there and that tool is not *SAN? We rename again?
> > 
> > So the "NOCHECK" suffix made much more sense, even if it was generic.
> > IMNSVHO.
> > 
> 
> Sounds reasonable.
> Ingo, what do you think?

Fine with me too.

Thanks,

	Ingo
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