linux-kernel - Re: [PATCH] MIPS: SGI-IP30: Use bitmap API when iterating over bitmap

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Date: Wed, 17 Apr 2024 10:27:13 -0700
From: Yury Norov <yury.norov@...il.com>
To: Philippe Mathieu-Daudé <philmd@...aro.org>
Cc: linux-kernel@...r.kernel.org,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	linux-mips@...r.kernel.org
Subject: Re: [PATCH] MIPS: SGI-IP30: Use bitmap API when iterating over bitmap

On Wed, Apr 17, 2024 at 09:18:29AM +0200, Philippe Mathieu-Daudé wrote:
> Do not open-code bitmap_set(). Besides, <linux/bitmap.h> API
> allows architecture specific optimizations, so prefer it.
> 
> Use the HEART_NUM_IRQS definition to express the end of the
> HEART bitmap.
> 
> Inspired-by: Yury Norov <yury.norov@...il.com>
> Signed-off-by: Philippe Mathieu-Daudé <philmd@...aro.org>
> ---
>  arch/mips/sgi-ip30/ip30-irq.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/arch/mips/sgi-ip30/ip30-irq.c b/arch/mips/sgi-ip30/ip30-irq.c
> index 423c32cb66ed..bdafff076191 100644
> --- a/arch/mips/sgi-ip30/ip30-irq.c
> +++ b/arch/mips/sgi-ip30/ip30-irq.c
> @@ -264,7 +264,6 @@ void __init arch_init_irq(void)
>  	struct irq_domain *domain;
>  	struct fwnode_handle *fn;
>  	unsigned long *mask;
> -	int i;
>  
>  	mips_cpu_irq_init();
>  
> @@ -300,8 +299,7 @@ void __init arch_init_irq(void)
>  	set_bit(HEART_L3_INT_TIMER, heart_irq_map);
>  
>  	/* Reserve the error interrupts (#51 to #63). */
> -	for (i = HEART_L4_INT_XWID_ERR_9; i <= HEART_L4_INT_HEART_EXCP; i++)
> -		set_bit(i, heart_irq_map);
> +	bitmap_set(heart_irq_map, HEART_L4_INT_XWID_ERR_9, HEART_NUM_IRQS);

This function has a signature
        bitmap_set(map, start, length)

So this should be a:
        bitmap_set(heart_irq_map, HEART_L4_INT_XWID_ERR_9,
                   HEART_NUM_IRQS - HEART_L4_INT_XWID_ERR_9 + 1)

Also on the above group of set_bit(). It should be 2 bitmap_set()
calls to me. HEART_L0_INT [0, 2] is the first one, and HEART_L2_INT
to HEART_L4_INT [46, 63] is the other. Isn't?

Thanks,
Yury