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

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Message-ID: <20230213201715.at64fowda2xgertt@pali>
Date:   Mon, 13 Feb 2023 21:17:15 +0100
From:   Pali Rohár <pali@...nel.org>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     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>,
        "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

On Monday 13 February 2023 20:06:27 Christophe Leroy wrote:
> 
> 
> 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

Ok, I can change code to:

+if (IS_ENABLED(CONFIG_PPC_I8259))
+    mpc85xx_8259_init();

I guess it should be equivalent.

> >   }
> >   
> >   #ifdef CONFIG_PCI