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

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Date:	Thu, 17 Apr 2014 14:03:34 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Borislav Petkov <bp@...en8.de>,
	Peter Zijlstra <peterz@...radead.org>
CC:	"mingo@...nel.org" <mingo@...nel.org>,
	"hpa@...or.com" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
	"atodorov@...hat.com" <atodorov@...hat.com>,
	"gong.chen@...ux.intel.com" <gong.chen@...ux.intel.com>,
	"jwboyer@...oraproject.org" <jwboyer@...oraproject.org>,
	"qmewlo@...il.com" <qmewlo@...il.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

> Hohum, __raw_spin_lock_irqsave does preempt_disable(). And
> machine_check_poll should be running in irq context so why would the
> original issue happen?
>
>> kernel: [    7.341085] BUG: using __this_cpu_write() in preemptible [00000000] code: modprobe/546
>
> Unfortunately, I have only one line in a mail CCed to me.
>
> Color me confused.

Is this just the missing put_cpu() that Chen Gong already sent a patch for?

See attached

-Tony

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