linux-kernel - Re: CONFIG_IRQ

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Date:   Fri, 16 Feb 2018 15:54:17 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Randy Dunlap <rdunlap@...radead.org>
Cc:     LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>
Subject: Re: CONFIG_IRQ_TIMINGS?

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.




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