linux-kernel - Re: [PATCH RT 3.18] irq_work: Provide a soft-irq based queue

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Date:	Thu, 23 Apr 2015 09:14:35 +0200
From:	Jan Kiszka <jan.kiszka@...mens.com>
To:	Mike Galbraith <umgwanakikbuti@...il.com>
CC:	Steven Rostedt <rostedt@...dmis.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	RT <linux-rt-users@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RT 3.18] irq_work: Provide a soft-irq based queue

On 2015-04-23 08:58, Mike Galbraith wrote:
> On Thu, 2015-04-23 at 08:29 +0200, Jan Kiszka wrote:
>>
>>>  void irq_work_tick(void)
>>>  {
>>> -#ifdef CONFIG_PREEMPT_RT_FULL
>>> -       irq_work_run_list(this_cpu_ptr(&lazy_list));
>>> -#else
>>> -       struct llist_head *raised = &__get_cpu_var(raised_list);
>>> +       struct llist_head *raised = this_cpu_ptr(&raised_list);
>>>  
>>> -       if (!llist_empty(raised) && !arch_irq_work_has_interrupt())
>>> +       if (!llist_empty(raised) && 
>>> (!arch_irq_work_has_interrupt() ||
>>> +           IS_ENABLED(CONFIG_PREEMPT_RT_FULL)))
>>
>> OK, that additional condition is addressing archs that don't have
>> irq_work support and fall back to the timer, right?
> 
> How will ever run if it is not run in either irq_work_run() or 
> irq_work_tick()?  There are two choices, we better pick one.

Ah, now I see it. Indeed.

OK, will run through your fix and suggestions and come up with a new
version.

Thanks,
Jan

-- 
Siemens AG, Corporate Technology, CT RTC ITP SES-DE
Corporate Competence Center Embedded Linux
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