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

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Message-ID: <20140425084723.GA7455@gchen.bj.intel.com>
Date:	Fri, 25 Apr 2014 04:47:23 -0400
From:	"Chen, Gong" <gong.chen@...ux.intel.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Borislav Petkov <bp@...en8.de>, Owen Kibel <qmewlo@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Josh Boyer <jwboyer@...oraproject.org>,
	"Luck, Tony" <tony.luck@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"hpa@...or.com" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"atodorov@...hat.com" <atodorov@...hat.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 Fri, Apr 18, 2014 at 10:07:16AM +0200, Ingo Molnar wrote:
> Okay, so AFAICS the fix in x86/urgent isn't wrong functionally, it's 
> just that the changelog incorrectly claims the raw-spinlock use is a 
> bug causing a problem here.
> 
> Still that raw spinlock is bogus and might be hiding other problems, 
> so we can keep the x86/urgent change (ea431643d6c3) as-is and I'll get 
> it to Linus later today ...
> 
> Thanks,
> 
> 	Ingo
Hi, Ingo

We ever had a patch(59d958d2c7) to make spinlock -> raw_spinlock.
Would you please explain it a little more why you revert it?

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