linux-kernel - Re: [PATCH 1/6] genirq: Remove IRQ timing tracking infrastructure

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Message-ID: <7d0e0ce8-91da-0fd4-e509-27961388af60@huawei.com>
Date: Thu, 11 Dec 2025 09:32:39 +0800
From: Jinjie Ruan <ruanjinjie@...wei.com>
To: Marc Zyngier <maz@...nel.org>, <linux-kernel@...r.kernel.org>,
	<linux-mips@...r.kernel.org>
CC: Daniel Lezcano <daniel.lezcano@...aro.org>, Thomas Gleixner
	<tglx@...utronix.de>, Thomas Bogendoerfer <tsbogend@...ha.franken.de>, Joshua
 Kinard <kumba@...too.org>
Subject: Re: [PATCH 1/6] genirq: Remove IRQ timing tracking infrastructure



On 2025/12/10 16:22, Marc Zyngier wrote:
> The IRQ timing tracking infrastructure was merged in 2019, but was
> never plumbed in, is not selectable, and is therefore never used.
> 
> As Daniel agrees that there is little hope for this infrastructure
> to be completed in the near term, drop it altogether.
> 
> Signed-off-by: Marc Zyngier <maz@...nel.org>
> Link: https://lore.kernel.org/r/87zf7vex6h.wl-maz@kernel.org
> ---
>  include/linux/interrupt.h |   6 -
>  kernel/irq/Kconfig        |   3 -
>  kernel/irq/Makefile       |   4 -
>  kernel/irq/handle.c       |   2 -
>  kernel/irq/internals.h    | 110 -----
>  kernel/irq/manage.c       |   3 -
>  kernel/irq/timings.c      | 959 --------------------------------------
>  lib/Kconfig.debug         |   8 -
>  8 files changed, 1095 deletions(-)
>  delete mode 100644 kernel/irq/timings.c

Reviewed-by: Jinjie Ruan <ruanjinjie@...wei.com>

> 
> diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
> index 266f2b39213a0..44e335b17ed64 100644
> --- a/include/linux/interrupt.h
> +++ b/include/linux/interrupt.h
> @@ -871,12 +871,6 @@ static inline void init_irq_proc(void)
>  }
>  #endif
>  
> -#ifdef CONFIG_IRQ_TIMINGS
> -void irq_timings_enable(void);
> -void irq_timings_disable(void);
> -u64 irq_timings_next_event(u64 now);
> -#endif
> -
[...]

> -
>  config TEST_LKM
>  	tristate "Test module loading with 'hello world' module"
>  	depends on m