netdev - Re: [PATCH] vhost-vdpa: Remove usage of the deprecated ida_simple

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Date: Sun, 14 Apr 2024 04:35:03 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc: Jason Wang <jasowang@...hat.com>, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org, kvm@...r.kernel.org,
	virtualization@...ts.linux.dev, netdev@...r.kernel.org
Subject: Re: [PATCH] vhost-vdpa: Remove usage of the deprecated
 ida_simple_xx() API

On Mon, Jan 15, 2024 at 09:35:50PM +0100, Christophe JAILLET wrote:
> ida_alloc() and ida_free() should be preferred to the deprecated
> ida_simple_get() and ida_simple_remove().
> 
> Note that the upper limit of ida_simple_get() is exclusive, buInputt the one of

What's buInputt? But?

> ida_alloc_max() is inclusive. So a -1 has been added when needed.
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>


Jason, wanna ack?

> ---
>  drivers/vhost/vdpa.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
> index bc4a51e4638b..849b9d2dd51f 100644
> --- a/drivers/vhost/vdpa.c
> +++ b/drivers/vhost/vdpa.c
> @@ -1534,7 +1534,7 @@ static void vhost_vdpa_release_dev(struct device *device)
>  	struct vhost_vdpa *v =
>  	       container_of(device, struct vhost_vdpa, dev);
>  
> -	ida_simple_remove(&vhost_vdpa_ida, v->minor);
> +	ida_free(&vhost_vdpa_ida, v->minor);
>  	kfree(v->vqs);
>  	kfree(v);
>  }
> @@ -1557,8 +1557,8 @@ static int vhost_vdpa_probe(struct vdpa_device *vdpa)
>  	if (!v)
>  		return -ENOMEM;
>  
> -	minor = ida_simple_get(&vhost_vdpa_ida, 0,
> -			       VHOST_VDPA_DEV_MAX, GFP_KERNEL);
> +	minor = ida_alloc_max(&vhost_vdpa_ida, VHOST_VDPA_DEV_MAX - 1,
> +			      GFP_KERNEL);
>  	if (minor < 0) {
>  		kfree(v);
>  		return minor;
> -- 
> 2.43.0