linux-kernel - Re: IRQs in /proc/irq/* that aren't listed in /proc/interrupts?

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Message-ID: <0d3cff4f-619f-3479-2195-e07451636249@windriver.com>
Date:   Tue, 13 Oct 2020 00:21:02 -0600
From:   Chris Friesen <chris.friesen@...driver.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: IRQs in /proc/irq/* that aren't listed in /proc/interrupts?

On 10/12/2020 1:37 PM, Thomas Gleixner wrote:
> On Mon, Oct 12 2020 at 12:40, Chris Friesen wrote:
>> On one of my X86-64 systems /proc/interrupts starts with the following
>> interrupts (per-cpu info snipped):
>>
>>     0:      IR-IO-APIC-edge      timer
>>      4:      IR-IO-APIC-edge      serial
>>      8:      IR-IO-APIC-edge      rtc0
>>      9:      IR-IO-APIC-fasteoi   acpi
>>     17:      IR-IO-APIC-fasteoi   ehci_hcd:usb1, hpilo
>>
>>
>> On this same system /proc/irq shows these interrupts:
>>
>> 0-15, 17
>>
>> Is there any way to determine what the interrupts are that aren't listed
>> in /proc/interrupts?
> 
> They are simply unused

I wonder if it might be clearer to just not report them at all if 
they're not used?

Anyways, thanks for the explanation.

Chris