linux-kernel - Re: [PATCH tip/core/rcu 02/20] x86: Use common outgoing-CPU-notification code

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Message-ID: <54F72891.5070805@citrix.com>
Date:	Wed, 4 Mar 2015 15:45:21 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	<paulmck@...ux.vnet.ibm.com>
CC:	<linux-kernel@...r.kernel.org>, <mingo@...nel.org>,
	<laijs@...fujitsu.com>, <dipankar@...ibm.com>,
	<akpm@...ux-foundation.org>, <mathieu.desnoyers@...icios.com>,
	<josh@...htriplett.org>, <tglx@...utronix.de>,
	<peterz@...radead.org>, <rostedt@...dmis.org>,
	<dhowells@...hat.com>, <edumazet@...gle.com>,
	<dvhart@...ux.intel.com>, <fweisbec@...il.com>, <oleg@...hat.com>,
	<bobby.prani@...il.com>, <x86@...nel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	<xen-devel@...ts.xenproject.org>
Subject: Re: [PATCH tip/core/rcu 02/20] x86: Use common outgoing-CPU-notification
 code

On 04/03/15 14:55, Boris Ostrovsky wrote:
> 
> In the meantime, it turned out that HVM guests are broken by this patch
> (with our without changes that we've been discussing), because HVM CPUs
> die with
> 
> static void xen_hvm_cpu_die(unsigned int cpu)
> {
>         xen_cpu_die(cpu);
>         native_cpu_die(cpu);
> }
> 
> Which means that cpu_wait_death() is called twice, and second call moves
> the CPU to CPU_BROKEN.
> 
> The simple solution is to stop calling native_cpu_die() above but I'd
> like to use common code in native_cpu_die(). I'll see if I can carve it
> out without too much damage to x86.

If not really been following this thread but...

Would it be preferable to refactor xen_cpu_die() instead to factor out
its the cpu_wait_death() call?

David
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