linux-kernel - [PATCH 4/7] mm/hugetlb: Prepare hugetlb_follow_page_mask() for FOLL

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Message-Id: <20230613215346.1022773-5-peterx@redhat.com>
Date:   Tue, 13 Jun 2023 17:53:43 -0400
From:   Peter Xu <peterx@...hat.com>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     Matthew Wilcox <willy@...radead.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        John Hubbard <jhubbard@...dia.com>,
        Mike Rapoport <rppt@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        Vlastimil Babka <vbabka@...e.cz>, peterx@...hat.com,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        James Houghton <jthoughton@...gle.com>,
        Hugh Dickins <hughd@...gle.com>
Subject: [PATCH 4/7] mm/hugetlb: Prepare hugetlb_follow_page_mask() for FOLL_PIN

It's coming, not yet, but soon.  Loose the restriction.

Signed-off-by: Peter Xu <peterx@...hat.com>
---
 mm/hugetlb.c | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index f037eaf9d819..31d8f18bc2e4 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -6467,13 +6467,6 @@ struct page *hugetlb_follow_page_mask(struct vm_area_struct *vma,
 	spinlock_t *ptl;
 	pte_t *pte, entry;
 
-	/*
-	 * FOLL_PIN is not supported for follow_page(). Ordinary GUP goes via
-	 * follow_hugetlb_page().
-	 */
-	if (WARN_ON_ONCE(flags & FOLL_PIN))
-		return NULL;
-
 	hugetlb_vma_lock_read(vma);
 	pte = hugetlb_walk(vma, haddr, huge_page_size(h));
 	if (!pte)
-- 
2.40.1