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author | 2021-12-10 15:54:11 -0500 | |
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committer | 2022-03-21 12:56:35 -0400 | |
commit | b0496fe4effd83ef76c7440befb184f922b3ffbb (patch) | |
tree | d6eb7a132e7f8d0b31346f2abc9802f3e74ce548 /mm/gup.c | |
parent | mm/hugetlb: Use try_grab_folio() instead of try_grab_compound_head() (diff) | |
download | linux-b0496fe4effd83ef76c7440befb184f922b3ffbb.tar.gz linux-b0496fe4effd83ef76c7440befb184f922b3ffbb.tar.bz2 linux-b0496fe4effd83ef76c7440befb184f922b3ffbb.zip |
mm/gup: Convert gup_pte_range() to use a folio
We still call try_grab_folio() once per PTE; a future patch could
optimise to just adjust the reference count for each page within
the folio.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
Diffstat (limited to 'mm/gup.c')
-rw-r--r-- | mm/gup.c | 18 |
1 files changed, 8 insertions, 10 deletions
@@ -2232,7 +2232,8 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end, ptem = ptep = pte_offset_map(&pmd, addr); do { pte_t pte = ptep_get_lockless(ptep); - struct page *head, *page; + struct page *page; + struct folio *folio; /* * Similar to the PMD case below, NUMA hinting must take slow @@ -2259,22 +2260,20 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end, VM_BUG_ON(!pfn_valid(pte_pfn(pte))); page = pte_page(pte); - head = try_grab_compound_head(page, 1, flags); - if (!head) + folio = try_grab_folio(page, 1, flags); + if (!folio) goto pte_unmap; if (unlikely(page_is_secretmem(page))) { - put_compound_head(head, 1, flags); + gup_put_folio(folio, 1, flags); goto pte_unmap; } if (unlikely(pte_val(pte) != pte_val(*ptep))) { - put_compound_head(head, 1, flags); + gup_put_folio(folio, 1, flags); goto pte_unmap; } - VM_BUG_ON_PAGE(compound_head(page) != head, page); - /* * We need to make the page accessible if and only if we are * going to access its content (the FOLL_PIN case). Please @@ -2284,14 +2283,13 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end, if (flags & FOLL_PIN) { ret = arch_make_page_accessible(page); if (ret) { - unpin_user_page(page); + gup_put_folio(folio, 1, flags); goto pte_unmap; } } - SetPageReferenced(page); + folio_set_referenced(folio); pages[*nr] = page; (*nr)++; - } while (ptep++, addr += PAGE_SIZE, addr != end); ret = 1; |