linux-kernel - Re: [patch 07/16] genirq: Introduce helper irq_domain_set

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Date:	Thu, 13 Nov 2014 17:57:29 +0800
From:	Yingjoe Chen <yingjoe.chen@...iatek.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Grant Likely <grant.likely@...aro.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Yijing Wang <wangyijing@...wei.com>
Subject: Re: [patch 07/16] genirq: Introduce helper irq_domain_set_info()
 to reduce duplicated code


On Wed, 2014-11-12 at 13:43 +0000, Thomas Gleixner wrote:
> plain text document attachment
> (rfc-part4-v1-02-17-genirq-introduce-helper-irq_domain_set_info-to-reduce-duplicated-code.patch)
> From: Jiang Liu <jiang.liu@...ux.intel.com>
> 
> Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
> Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> Cc: Grant Likely <grant.likely@...aro.org>
> Cc: Marc Zyngier <marc.zyngier@....com>
> Cc: Yingjoe Chen <yingjoe.chen@...iatek.com>
> Cc: Yijing Wang <wangyijing@...wei.com>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> ---
>  include/linux/irqdomain.h |    5 +++++
>  kernel/irq/irqdomain.c    |   10 ++++++++++
>  2 files changed, 15 insertions(+)
> 
> Index: tip/include/linux/irqdomain.h
> ===================================================================
> --- tip.orig/include/linux/irqdomain.h
> +++ tip/include/linux/irqdomain.h
> @@ -33,6 +33,7 @@
>  #define _LINUX_IRQDOMAIN_H
>  
>  #include <linux/types.h>
> +#include <linux/irqhandler.h>
>  #include <linux/radix-tree.h>
>  
>  struct device_node;
> @@ -263,6 +264,10 @@ extern int irq_domain_set_hwirq_and_chip
>  					 irq_hw_number_t hwirq,
>  					 struct irq_chip *chip,
>  					 void *chip_data);
> +extern void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
> +				irq_hw_number_t hwirq, struct irq_chip *chip,
> +				void *chip_data, irq_flow_handler_t handler,
> +				void *handler_data, const char *handler_name);
>  extern void irq_domain_reset_irq_data(struct irq_data *irq_data);
>  extern void irq_domain_free_irqs_common(struct irq_domain *domain,
>  					int virq, int nr_irqs);
> Index: tip/kernel/irq/irqdomain.c
> ===================================================================
> --- tip.orig/kernel/irq/irqdomain.c
> +++ tip/kernel/irq/irqdomain.c
> @@ -882,6 +882,16 @@ int irq_domain_set_hwirq_and_chip(struct
>  	return 0;
>  }
>  
> +void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
> +			 irq_hw_number_t hwirq, struct irq_chip *chip,
> +			 void *chip_data, irq_flow_handler_t handler,
> +			 void *handler_data, const char *handler_name)
> +{
> +	irq_domain_set_hwirq_and_chip(domain, virq, hwirq, chip, chip_data);
> +	__irq_set_handler(virq, handler, 0, handler_name);
> +	irq_set_handler_data(virq, handler_data);
> +}
> +

Hi,

While trying to use this function, I'm not sure about its interface.
This function have 8 parameters but only save 3 function calls. After
checking uses in Jiang's original patch, I think this make code harder
to understand.

Joe.C


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