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From: David Vrabel <david.vrabel@citrix.com>
To: Julien Grall <julien.grall@arm.com>,
	Anna-Maria Gleixner <anna-maria@linutronix.de>,
	linux-kernel@vger.kernel.org
Cc: Juergen Gross <JGross@suse.com>,
	sstabellini@kernel.org, rt@linutronix.de,
	xen-devel@lists.xenproject.org,
	Boris Ostrovsky <Boris.Ostrovsky@oracle.com>,
	David Vrabel <david.vrabel@citrix.com>
Subject: Re: [PATCH] xen: Add comment for missing FROZEN notifier transitions
Date: Mon, 4 Apr 2016 17:30:59 +0100	[thread overview]
Message-ID: <570296C3.70805__33611.8631450974$1459787607$gmane$org@citrix.com> (raw)
In-Reply-To: <57029499.7070007@arm.com>

On 04/04/16 17:21, Julien Grall wrote:
> (CC Stefano new e-mail address)
> 
> Hello Anna-Maria,
> 
> On 04/04/2016 13:32, Anna-Maria Gleixner wrote:
>> Xen guests do not offline/online CPUs during suspend/resume and
>> therefore FROZEN notifier transitions are not required. Add this
>> explanation as a comment in the code to get not confused why
>> CPU_TASKS_FROZEN masked transitions are not considered.

Alternatively, these could be added even if they are not encountered.
This might be more future-proof but the documentation might be clearer.

Boris, Juergen, any opinion?

David>> --- a/drivers/xen/events/events_fifo.c
>> +++ b/drivers/xen/events/events_fifo.c
>> @@ -425,6 +425,12 @@ static int evtchn_fifo_cpu_notification(
>>       int cpu = (long)hcpu;
>>       int ret = 0;
>>
>> +    /*
>> +     * Xen guests do not offline/online CPUs during
>> +     * suspend/resume, thus CPU_TASKS_FROZEN masked transitions
>> +     * are not considered.
>> +    */
> 
> NIT: The '*' is not aligned with the others.

If this doesn't need any other changes, I'll fix this on commit.

David

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  parent reply	other threads:[~2016-04-04 16:32 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1459773140-43707-1-git-send-email-anna-maria@linutronix.de>
2016-04-04 16:21 ` Julien Grall
     [not found] ` <57029499.7070007@arm.com>
2016-04-04 16:30   ` David Vrabel [this message]
     [not found]   ` <570296C3.70805@citrix.com>
2016-04-04 16:48     ` Boris Ostrovsky
     [not found]     ` <57029AC7.90201@oracle.com>
2016-04-05  4:22       ` Juergen Gross
     [not found]       ` <57033D78.8010306@suse.com>
2016-04-06 23:52         ` Stefano Stabellini
2016-04-06 13:09 ` David Vrabel
     [not found] ` <57050A98.80901@cantab.net>
2016-04-06 14:08   ` [PREEMPT-RT] " Anna-Maria Gleixner
2016-04-06 23:53   ` Stefano Stabellini
2016-04-04 12:32 Anna-Maria Gleixner

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