linux-kernel - Re: [PATCH RFC 09/12] mm/gup: Handle huge pud for follow_pud

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Message-ID: <ZV7/H6zTYodxVNl0@infradead.org>
Date:   Wed, 22 Nov 2023 23:28:31 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Peter Xu <peterx@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Mike Kravetz <mike.kravetz@...cle.com>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Lorenzo Stoakes <lstoakes@...il.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Matthew Wilcox <willy@...radead.org>,
        John Hubbard <jhubbard@...dia.com>,
        Mike Rapoport <rppt@...nel.org>,
        Hugh Dickins <hughd@...gle.com>,
        David Hildenbrand <david@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Rik van Riel <riel@...riel.com>,
        James Houghton <jthoughton@...gle.com>,
        Yang Shi <shy828301@...il.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH RFC 09/12] mm/gup: Handle huge pud for follow_pud_mask()

> We need to export "struct follow_page_context" along the way, so that
> huge_memory.c can understand it.

Again, thankfully not actually exported, just made global.

> @@ -751,24 +746,25 @@ static struct page *follow_pud_mask(struct vm_area_struct *vma,
>  				    unsigned int flags,
>  				    struct follow_page_context *ctx)
>  {
> -	pud_t *pud;
> +	pud_t *pudp, pud;

This adding of pud while useful seems mostly unrelated and clutter
the patch up quite a bit.  If you have to respin this anyway it might
be worth to split it out into a little prep patch.