linux-kernel - Re: CONFIG_IRQ

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Date:   Fri, 16 Feb 2018 09:51:28 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>
Subject: Re: CONFIG_IRQ_TIMINGS?

On 02/16/2018 06:54 AM, Daniel Lezcano wrote:
> On 16/02/2018 15:16, Thomas Gleixner wrote:
>> On Thu, 15 Feb 2018, Randy Dunlap wrote:
>>
>>> Hi,
>>>
>>> Is this a dead kconfig symbol?  I don't see any Kconfig file that
>>> sets/enables it.
>>>
>>> ./kernel/irq/Makefile:4:obj-$(CONFIG_IRQ_TIMINGS) += timings.o
>>> ./kernel/irq/internals.h:#ifdef CONFIG_IRQ_TIMINGS
>>> ./kernel/irq/internals.h:#endif /* CONFIG_IRQ_TIMINGS */
>>> ./include/linux/interrupt.h:#ifdef CONFIG_IRQ_TIMINGS
> 
> This feature is not supposed to be selected by the user but by a
> subsystem depending on it. This subsystems is not yet ready, this is why
> the option is not selectable for now.
> 
> The algorithm using these timings appears to be too heavy for the
> kernel, it needs some rework.

OK, thanks for the info.

-- 
~Randy