linux-kernel - Re: perf hw in kexeced kernel broken in tip

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Date:	Wed, 01 Dec 2010 20:38:12 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Yinghai Lu <yinghai@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	Jason Wessel <jason.wessel@...driver.com>,
	Don Zickus <dzickus@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Haren Myneni <hbabu@...ibm.com>
Subject: Re: perf hw  in kexeced kernel broken in tip

On Wed, 2010-12-01 at 11:23 -0500, Vivek Goyal wrote:
> > What does kexec normally do to ensure hardware is left in a sane state?
> 
> Typically calls device_shutdown() and sysdev_shutdown() from
> kernel_restart_prepare() to shutdown the devices.
> 
> Also calls machine_shutdown() which depending on architecture can take
> care of various things like stopping other cpus, shutting down LAPIC, 
> disabling IOAPIC, disabling hpet, shutting down IOMMU etc
> (native_machine_shutdown()). 

So basically there's no sane generic reset callout?
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