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

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Date: Thu, 18 Apr 2024 15:37:58 +0200
From: Philippe Mathieu-Daudé <philmd@...aro.org>
To: Yury Norov <yury.norov@...il.com>
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 17/4/24 19:27, Yury Norov wrote:
> 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)

Doh, I thought it was (map, from_inc, to_exc), my bad.

> 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?

Please disregard this patch, sorry for the noise.

Regards,

Phil.