linux-kernel - Re: [PATCH 2/6] genirq: Remove __request_percpu

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Message-ID: <4091884c-e499-ba2f-104d-022786a95648@huawei.com>
Date: Thu, 11 Dec 2025 09:46:10 +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 2/6] genirq: Remove __request_percpu_irq() helper



On 2025/12/10 16:22, Marc Zyngier wrote:
> With the IRQ timing stuff being gone, there is no need to specify
> a flag when requesting a percpu interrupt. Not only IRQF_TIMER was
> the only flag (set of flags actually) allowed, but nobody ever
> passed it.
> 
> Get rid of __request_percpu_irq(), which was only getting 0 as flags,
> and promote request_percpu_irq_affinity() as its replacement.
> 
> Signed-off-by: Marc Zyngier <maz@...nel.org>
> ---
>  include/linux/interrupt.h | 18 ++++--------------
>  kernel/irq/manage.c       | 16 ++++++----------
>  2 files changed, 10 insertions(+), 24 deletions(-)
> 
> diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
> index 44e335b17ed64..00c01b0a43be1 100644
> --- a/include/linux/interrupt.h
> +++ b/include/linux/interrupt.h
> @@ -181,9 +181,8 @@ request_any_context_irq(unsigned int irq, irq_handler_t handler,
>  			unsigned long flags, const char *name, void *dev_id);
>  
>  extern int __must_check
> -__request_percpu_irq(unsigned int irq, irq_handler_t handler,
> -		     unsigned long flags, const char *devname,
> -		     const cpumask_t *affinity, void __percpu *percpu_dev_id);
> +request_percpu_irq_affinity(unsigned int irq, irq_handler_t handler, const char *devname,
> +			    const cpumask_t *affinity, void __percpu *percpu_dev_id);
>  
>  extern int __must_check
>  request_nmi(unsigned int irq, irq_handler_t handler, unsigned long flags,
> @@ -193,17 +192,8 @@ static inline int __must_check
>  request_percpu_irq(unsigned int irq, irq_handler_t handler,
>  		   const char *devname, void __percpu *percpu_dev_id)
>  {
> -	return __request_percpu_irq(irq, handler, 0,
> -				    devname, NULL, percpu_dev_id);
> -}
> -
> -static inline int __must_check
> -request_percpu_irq_affinity(unsigned int irq, irq_handler_t handler,
> -			    const char *devname, const cpumask_t *affinity,
> -			    void __percpu *percpu_dev_id)
> -{
> -	return __request_percpu_irq(irq, handler, 0,
> -				    devname, affinity, percpu_dev_id);
> +	return request_percpu_irq_affinity(irq, handler, devname,
> +					   NULL, percpu_dev_id);
>  }
>  
>  extern int __must_check
> diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
> index 7b25ffc5c43a4..1c858be09ba13 100644
> --- a/kernel/irq/manage.c
> +++ b/kernel/irq/manage.c
> @@ -2510,10 +2510,9 @@ struct irqaction *create_percpu_irqaction(irq_handler_t handler, unsigned long f
>  }
>  
>  /**
> - * __request_percpu_irq - allocate a percpu interrupt line
> + * request_percpu_irq_affinity - allocate a percpu interrupt line
>   * @irq:	Interrupt line to allocate
>   * @handler:	Function to be called when the IRQ occurs.
> - * @flags:	Interrupt type flags (IRQF_TIMER only)
>   * @devname:	An ascii name for the claiming device
>   * @affinity:	A cpumask describing the target CPUs for this interrupt
>   * @dev_id:	A percpu cookie passed back to the handler function
> @@ -2526,9 +2525,9 @@ struct irqaction *create_percpu_irqaction(irq_handler_t handler, unsigned long f
>   * the handler gets called with the interrupted CPU's instance of
>   * that variable.
>   */
> -int __request_percpu_irq(unsigned int irq, irq_handler_t handler,
> -			 unsigned long flags, const char *devname,
> -			 const cpumask_t *affinity, void __percpu *dev_id)
> +int request_percpu_irq_affinity(unsigned int irq, irq_handler_t handler,
> +				const char *devname, const cpumask_t *affinity,
> +				void __percpu *dev_id)
>  {
>  	struct irqaction *action;
>  	struct irq_desc *desc;
> @@ -2542,10 +2541,7 @@ int __request_percpu_irq(unsigned int irq, irq_handler_t handler,
>  	    !irq_settings_is_per_cpu_devid(desc))
>  		return -EINVAL;
>  
> -	if (flags && flags != IRQF_TIMER)
> -		return -EINVAL;
> -
> -	action = create_percpu_irqaction(handler, flags, devname, affinity, dev_id);
> +	action = create_percpu_irqaction(handler, 0, devname, affinity, dev_id);

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

>  	if (!action)
>  		return -ENOMEM;
>  
> @@ -2564,7 +2560,7 @@ int __request_percpu_irq(unsigned int irq, irq_handler_t handler,
>  
>  	return retval;
>  }
> -EXPORT_SYMBOL_GPL(__request_percpu_irq);
> +EXPORT_SYMBOL(request_percpu_irq_affinity);
>  
>  /**
>   * request_percpu_nmi - allocate a percpu interrupt line for NMI delivery