linux-kernel - Re: [PATCH v4 1/9] lib/group_cpus: let group_cpu

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Message-ID: <1d7b96ca-a015-4730-9035-abb69cd6cda4@flourine.local>
Date: Tue, 7 Jan 2025 09:20:26 +0100
From: Daniel Wagner <dwagner@...e.de>
To: Hannes Reinecke <hare@...e.de>
Cc: Daniel Wagner <wagi@...nel.org>, Jens Axboe <axboe@...nel.dk>, 
	Keith Busch <kbusch@...nel.org>, Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>, 
	Kashyap Desai <kashyap.desai@...adcom.com>, Sumit Saxena <sumit.saxena@...adcom.com>, 
	Shivasharan S <shivasharan.srikanteshwara@...adcom.com>, Chandrakanth patil <chandrakanth.patil@...adcom.com>, 
	"Martin K. Petersen" <martin.petersen@...cle.com>, Nilesh Javali <njavali@...vell.com>, 
	GR-QLogic-Storage-Upstream@...vell.com, Don Brace <don.brace@...rochip.com>, 
	"Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>, 
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	storagedev@...rochip.com, virtualization@...ts.linux.dev
Subject: Re: [PATCH v4 1/9] lib/group_cpus: let group_cpu_evenly return
 number of groups

On Tue, Jan 07, 2025 at 08:51:57AM +0100, Hannes Reinecke wrote:
> >   void blk_mq_map_queues(struct blk_mq_queue_map *qmap)
> >   {
> >   	const struct cpumask *masks;
> > -	unsigned int queue, cpu;
> > +	unsigned int queue, cpu, nr_masks;
> > -	masks = group_cpus_evenly(qmap->nr_queues);
> > +	nr_masks = qmap->nr_queues;
> > +	masks = group_cpus_evenly(&nr_masks);
> 
> Hmph. I am a big fan of separating input and output paramenters;
> most ABI definitions will be doing that anyway.
> Makes it also really hard to track whether the output parameters
> had been set at all. Care to split it up?

What API do you have in mind?