linux-kernel - Re: [PATCH v2 15/17] arm64: Remove custom IRQ stat accounting

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Date:   Fri, 26 Jun 2020 12:58:36 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Valentin Schneider <valentin.schneider@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Russell King <linux@....linux.org.uk>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Sumit Garg <sumit.garg@...aro.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Andrew Lunn <andrew@...n.ch>, kernel-team@...roid.com
Subject: Re: [PATCH v2 15/17] arm64: Remove custom IRQ stat accounting

On 2020-06-25 19:26, Valentin Schneider wrote:
> On 24/06/20 20:58, Marc Zyngier wrote:
>> @@ -801,26 +802,15 @@ void show_ipi_list(struct seq_file *p, int prec)
>>       unsigned int cpu, i;
>> 
>>       for (i = 0; i < NR_IPI; i++) {
>> +		unsigned int irq = irq_desc_get_irq(ipi_desc[i]);
>>               seq_printf(p, "%*s%u:%s", prec - 1, "IPI", i,
>>                          prec >= 4 ? " " : "");
>>               for_each_online_cpu(cpu)
>> -			seq_printf(p, "%10u ",
>> -				   __get_irq_stat(cpu, ipi_irqs[i]));
>> +			seq_printf(p, "%10u ", kstat_irqs_cpu(irq, cpu));
>>               seq_printf(p, "      %s\n", ipi_types[i]);
> 
> How attached are we to that custom IPI printout? AIUI we *could* give 
> them
> a "prettier" name in request_percpu_irq() and let the standard procfs
> printout take the wheel.

I wish. Unfortunately, /proc/interrupts is likely to be considered ABI,
and I'm really worried to change this (see what happened last time we
tried to update /proc/cpuinfo to be less braindead...).

         M.
-- 
Jazz is not dead. It just smells funny...