linux-kernel - Re: [tip:x86/urgent] x86/mce: Fix CMCI preemption bugs

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Message-ID: <20140417194241.GF4321@pd.tnic>
Date:	Thu, 17 Apr 2014 21:42:41 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Josh Boyer <jwboyer@...oraproject.org>,
	Owen Kibel <qmewlo@...il.com>,
	"Luck, Tony" <tony.luck@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"hpa@...or.com" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"atodorov@...hat.com" <atodorov@...hat.com>,
	"gong.chen@...ux.intel.com" <gong.chen@...ux.intel.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"linux-tip-commits@...r.kernel.org" 
	<linux-tip-commits@...r.kernel.org>
Subject: Re: [tip:x86/urgent] x86/mce: Fix CMCI preemption bugs

On Thu, Apr 17, 2014 at 12:25:14PM -0700, Linus Torvalds wrote:
> No, Owen tested a simpler patch that just changes the "get_cpu_var()"
> to "__get_cpu_var()" and avoids the preempt increment.

Which basically would be the same as doing this_cpu_write() in the
proposed fix - both don't touch preemption. So it is something else.
More staring...

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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