linux-kernel - Re: [PATCH 1/5] genirq/affinity: move allocation of 'node_to_cpumask' to irq_build_affinity

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Message-ID: <20190207220204.GP7268@google.com>
Date:   Thu, 7 Feb 2019 16:02:05 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     Christoph Hellwig <hch@....de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        Sagi Grimberg <sagi@...mberg.me>,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org
Subject: Re: [PATCH 1/5] genirq/affinity: move allocation of
 'node_to_cpumask' to irq_build_affinity_masks

On Fri, Jan 25, 2019 at 05:53:43PM +0800, Ming Lei wrote:
> 'node_to_cpumask' is just one temparay variable for irq_build_affinity_masks(),
> so move it into irq_build_affinity_masks().
> 
> No functioanl change.

s/temparay/temporary/
s/functioanl/functional/

> Signed-off-by: Ming Lei <ming.lei@...hat.com>

Nice patch, this is much cleaner.

Reviewed-by: Bjorn Helgaas <bhelgaas@...gle.com>

> ---
>  kernel/irq/affinity.c | 27 +++++++++++++--------------
>  1 file changed, 13 insertions(+), 14 deletions(-)
> 
> diff --git a/kernel/irq/affinity.c b/kernel/irq/affinity.c
> index 45b68b4ea48b..118b66d64a53 100644
> --- a/kernel/irq/affinity.c
> +++ b/kernel/irq/affinity.c
> @@ -175,18 +175,22 @@ static int __irq_build_affinity_masks(const struct irq_affinity *affd,
>   */
>  static int irq_build_affinity_masks(const struct irq_affinity *affd,
>  				    int startvec, int numvecs, int firstvec,
> -				    cpumask_var_t *node_to_cpumask,
>  				    struct irq_affinity_desc *masks)
>  {
>  	int curvec = startvec, nr_present, nr_others;
>  	int ret = -ENOMEM;
>  	cpumask_var_t nmsk, npresmsk;
> +	cpumask_var_t *node_to_cpumask;
>  
>  	if (!zalloc_cpumask_var(&nmsk, GFP_KERNEL))
>  		return ret;
>  
>  	if (!zalloc_cpumask_var(&npresmsk, GFP_KERNEL))
> -		goto fail;
> +		goto fail_nmsk;
> +
> +	node_to_cpumask = alloc_node_to_cpumask();
> +	if (!node_to_cpumask)
> +		goto fail_npresmsk;
>  
>  	ret = 0;
>  	/* Stabilize the cpumasks */
> @@ -217,9 +221,12 @@ static int irq_build_affinity_masks(const struct irq_affinity *affd,
>  	if (nr_present < numvecs)
>  		WARN_ON(nr_present + nr_others < numvecs);
>  
> +	free_node_to_cpumask(node_to_cpumask);
> +
> + fail_npresmsk:
>  	free_cpumask_var(npresmsk);
>  
> - fail:
> + fail_nmsk:
>  	free_cpumask_var(nmsk);
>  	return ret;
>  }
> @@ -236,7 +243,6 @@ irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd)
>  {
>  	int affvecs = nvecs - affd->pre_vectors - affd->post_vectors;
>  	int curvec, usedvecs;
> -	cpumask_var_t *node_to_cpumask;
>  	struct irq_affinity_desc *masks = NULL;
>  	int i, nr_sets;
>  
> @@ -247,13 +253,9 @@ irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd)
>  	if (nvecs == affd->pre_vectors + affd->post_vectors)
>  		return NULL;
>  
> -	node_to_cpumask = alloc_node_to_cpumask();
> -	if (!node_to_cpumask)
> -		return NULL;
> -
>  	masks = kcalloc(nvecs, sizeof(*masks), GFP_KERNEL);
>  	if (!masks)
> -		goto outnodemsk;
> +		return NULL;
>  
>  	/* Fill out vectors at the beginning that don't need affinity */
>  	for (curvec = 0; curvec < affd->pre_vectors; curvec++)
> @@ -271,11 +273,10 @@ irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd)
>  		int ret;
>  
>  		ret = irq_build_affinity_masks(affd, curvec, this_vecs,
> -						curvec, node_to_cpumask, masks);
> +						curvec, masks);
>  		if (ret) {
>  			kfree(masks);
> -			masks = NULL;
> -			goto outnodemsk;
> +			return NULL;
>  		}
>  		curvec += this_vecs;
>  		usedvecs += this_vecs;
> @@ -293,8 +294,6 @@ irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd)
>  	for (i = affd->pre_vectors; i < nvecs - affd->post_vectors; i++)
>  		masks[i].is_managed = 1;
>  
> -outnodemsk:
> -	free_node_to_cpumask(node_to_cpumask);
>  	return masks;
>  }
>  
> -- 
> 2.9.5
>