linux-kernel - Re: [PATCH v2 07/12] s390: add pte_free

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Message-ID: <ZKUR0HItN2Va8J1D@li-008a6a4c-3549-11b2-a85c-c5cc2836eea2.ibm.com>
Date:   Wed, 5 Jul 2023 08:46:40 +0200
From:   Alexander Gordeev <agordeev@...ux.ibm.com>
To:     Hugh Dickins <hughd@...gle.com>
Cc:     Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Mike Rapoport <rppt@...nel.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
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        Peter Xu <peterx@...hat.com>,
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        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v2 07/12] s390: add pte_free_defer() for pgtables sharing
 page

On Sat, Jul 01, 2023 at 09:32:38PM -0700, Hugh Dickins wrote:
> On Thu, 29 Jun 2023, Hugh Dickins wrote:

Hi Hugh,

...

> +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> +void pte_free_defer(struct mm_struct *mm, pgtable_t pgtable)
> +{
> +	struct page *page;

If I got your and Claudio conversation right, you were going to add
here WARN_ON_ONCE() in case of mm_alloc_pgste(mm)?

> +	page = virt_to_page(pgtable);
> +	SetPageActive(page);
> +	page_table_free(mm, (unsigned long *)pgtable);
> +}
> +#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> +
>  /*
>   * Base infrastructure required to generate basic asces, region, segment,
>   * and page tables that do not make use of enhanced features like EDAT1.

Thanks!