linux-kernel - Re: [PATCH v2 4/8] powerpc/85xx: p2020: Move i8259 code into own function

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Message-ID: <0953ffd2-dddc-2706-66ab-d6913eff19df@csgroup.eu>
Date:   Mon, 13 Feb 2023 20:06:27 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Pali Rohár <pali@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Scott Wood <oss@...error.net>, Sinan Akman <sinan@...teme.com>,
        Martin Kennedy <hurricos@...il.com>
CC:     "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 4/8] powerpc/85xx: p2020: Move i8259 code into own
 function



Le 24/12/2022 à 22:14, Pali Rohár a écrit :
> Splits mpic and i8259 initialization codes into separate functions.
> 
> Signed-off-by: Pali Rohár <pali@...nel.org>
> ---
>   arch/powerpc/platforms/85xx/p2020.c | 37 ++++++++++++++++-------------
>   1 file changed, 21 insertions(+), 16 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/85xx/p2020.c b/arch/powerpc/platforms/85xx/p2020.c
> index d65d4c88ac47..b8584bf307b0 100644
> --- a/arch/powerpc/platforms/85xx/p2020.c
> +++ b/arch/powerpc/platforms/85xx/p2020.c
> @@ -45,6 +45,7 @@
>   #ifdef CONFIG_MPC85xx_DS
>   
>   #ifdef CONFIG_PPC_I8259
> +
>   static void mpc85xx_8259_cascade(struct irq_desc *desc)
>   {
>   	struct irq_chip *chip = irq_desc_get_chip(desc);
> @@ -55,27 +56,13 @@ static void mpc85xx_8259_cascade(struct irq_desc *desc)
>   	}
>   	chip->irq_eoi(&desc->irq_data);
>   }
> -#endif	/* CONFIG_PPC_I8259 */
>   
> -static void __init mpc85xx_ds_pic_init(void)
> +static void __init mpc85xx_8259_init(void)
>   {
> -	struct mpic *mpic;
> -#ifdef CONFIG_PPC_I8259
>   	struct device_node *np;
>   	struct device_node *cascade_node = NULL;
>   	int cascade_irq;
> -#endif
> -
> -	mpic = mpic_alloc(NULL, 0,
> -		  MPIC_BIG_ENDIAN |
> -		  MPIC_SINGLE_DEST_CPU,
> -		0, 256, " OpenPIC  ");
> -
> -	BUG_ON(mpic == NULL);
> -	mpic_init(mpic);
>   
> -#ifdef CONFIG_PPC_I8259
> -	/* Initialize the i8259 controller */
>   	for_each_node_by_type(np, "interrupt-controller")
>   	    if (of_device_is_compatible(np, "chrp,iic")) {
>   		cascade_node = np;
> @@ -93,13 +80,31 @@ static void __init mpc85xx_ds_pic_init(void)
>   		return;
>   	}
>   
> -	DBG("mpc85xxds: cascade mapped to irq %d\n", cascade_irq);
> +	DBG("i8259: cascade mapped to irq %d\n", cascade_irq);
>   
>   	i8259_init(cascade_node, 0);
>   	of_node_put(cascade_node);
>   
>   	irq_set_chained_handler(cascade_irq, mpc85xx_8259_cascade);
> +}
> +
>   #endif	/* CONFIG_PPC_I8259 */
> +
> +static void __init mpc85xx_ds_pic_init(void)
> +{
> +	struct mpic *mpic;
> +
> +	mpic = mpic_alloc(NULL, 0,
> +		  MPIC_BIG_ENDIAN |
> +		  MPIC_SINGLE_DEST_CPU,
> +		0, 256, " OpenPIC  ");
> +
> +	BUG_ON(mpic == NULL);
> +	mpic_init(mpic);
> +
> +#ifdef CONFIG_PPC_I8259

Ca we minimise number of #ifdef CONFIG_PPC_I8259 by using 
IS_ENABLED(CONFIG_PPC_I8259) inside if/else ?

> +	mpc85xx_8259_init();
> +#endif
>   }
>   
>   #ifdef CONFIG_PCI