linux-kernel - Re: [tip:smp/hotplug] cpu/hotplug: Prevent alloc/free of irq descriptors during CPU up/down (again)

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Message-ID: <b1260236-1f66-42e5-7641-a9e4eca843d6@oracle.com>
Date:	Thu, 11 Aug 2016 11:06:29 -0400
From:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	linux-kernel@...r.kernel.org, tglx@...utronix.de, jgross@...e.com,
	torvalds@...ux-foundation.org, mingo@...nel.org, hpa@...or.com,
	peterz@...radead.org, anna-maria@...utronix.de
Subject: Re: [tip:smp/hotplug] cpu/hotplug: Prevent alloc/free of irq
 descriptors during CPU up/down (again)

On 08/11/2016 10:44 AM, Sebastian Andrzej Siewior wrote:
> On 2016-08-11 10:30:57 [-0400], Boris Ostrovsky wrote:
>> So you must have converted Xen code already then? Can you post those
>> patches (not all 1285, just Xen-related, assuming there are no
>> dependencies) and I'll see if I can add them to this series?
> 
> This is patch 77. I *hope* the only clash (if any) will be in
> cpuhotplug.h. I did not yet retest things in terms of apply & compile.
> I plan to do so within this + next week. If you want to test it right
> away, please do so :)
> 
> From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> Date: Wed, 4 Nov 2015 21:06:00 +0100
> Subject: [PATCH] xen: events: fifo: Convert to hotplug state machine
> 
> Install the callbacks via the state machine. In theory we could remove the
> upper call evtchn_fifo_alloc_control_block() and have callback invoked for
> all online CPUs but this does not reflect the currect code.
> 
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
> Cc: David Vrabel <david.vrabel@...rix.com>
> Cc: xen-devel@...ts.xenproject.org
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> ---
>  drivers/xen/events/events_fifo.c |   33 +++++++++++----------------------
>  include/linux/cpuhotplug.h       |    1 +
>  2 files changed, 12 insertions(+), 22 deletions(-)


I was actually looking for arch/x86/xen/enlighten.c patch but if you
don't have it I can do it myself.


> --- a/include/linux/cpuhotplug.h
> +++ b/include/linux/cpuhotplug.h
> @@ -22,6 +22,7 @@ enum cpuhp_state {
>  	CPUHP_SMPCFD_PREPARE,
>  	CPUHP_RELAY_PREPARE,
>  	CPUHP_SLAB_PREPARE,
> +	CPUHP_XEN_EV_PREPEARE,

Misspelled PREPARE.

-boris