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Re: [PATCH 02/11] xen/page_alloc: Remove `claim` from domain_set_outstanding_pages()
- To: Alejandro Vallejo <alejandro.vallejo@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 10 Jun 2025 14:37:25 +0200
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- Cc: Bernhard Kaindl <bernhard.kaindl@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 10 Jun 2025 12:37:42 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 14.03.2025 18:24, Alejandro Vallejo wrote:
> --- a/xen/common/page_alloc.c
> +++ b/xen/common/page_alloc.c
> @@ -523,7 +523,7 @@ out:
> int domain_set_outstanding_pages(struct domain *d, unsigned long pages)
> {
> int ret = -ENOMEM;
> - unsigned long claim, avail_pages;
> + unsigned long avail_pages;
>
> /*
> * take the domain's page_alloc_lock, else all d->tot_page adjustments
> @@ -549,28 +549,21 @@ int domain_set_outstanding_pages(struct domain *d,
> unsigned long pages)
> goto out;
> }
>
> - /* disallow a claim not exceeding domain_tot_pages() or above max_pages
> */
> - if ( (pages <= domain_tot_pages(d)) || (pages > d->max_pages) )
> + /* Don't claim past max_pages */
> + if ( (domain_tot_pages(d) + pages) > d->max_pages )
In addition to what Roger has said, how can such a behavioral change come
without
any caller-side adjustment?
Jan
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