linux-kernel - Re: [PATCH 18/18] xen/xenbus: eliminate xenbus_grant

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Date:   Wed, 20 Apr 2022 15:22:32 +0000
From:   Andrew Cooper <Andrew.Cooper3@...rix.com>
To:     Juergen Gross <jgross@...e.com>,
        "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>
Subject: Re: [PATCH 18/18] xen/xenbus: eliminate xenbus_grant_ring()

On 20/04/2022 16:09, Juergen Gross wrote:
> diff --git a/drivers/xen/xenbus/xenbus_client.c b/drivers/xen/xenbus/xenbus_client.c
> index 1a2e0d94ccd1..7b1f7f86b6e5 100644
> --- a/drivers/xen/xenbus/xenbus_client.c
> +++ b/drivers/xen/xenbus/xenbus_client.c
> @@ -433,9 +390,24 @@ int xenbus_setup_ring(struct xenbus_device *dev, gfp_t gfp, void **vaddr,
>  		goto err;
>  	}
>  
> -	ret = xenbus_grant_ring(dev, *vaddr, nr_pages, grefs);
> -	if (ret)
> +	ret = gnttab_alloc_grant_references(nr_pages, &gref_head);
> +	if (ret) {
> +		xenbus_dev_fatal(dev, ret, "granting access to ring page");

Can we take the opportunity to unbreak this error message?  "%u ring pages".

~Andrew