From e93480537fd7ecaf5ed1a662a979376f6fee50e3 Mon Sep 17 00:00:00 2001 From: "Kirill A. Shutemov" Date: Thu, 16 Mar 2017 18:26:52 +0300 Subject: [PATCH] mm/gup: Mark all pages PageReferenced in generic get_user_pages_fast() This is a preparation patch for the transition of x86 to the generic GUP_fast() implementation. Unlike generic GUP_fast(), the x86 version makes all pages it touches referenced. It seems required for GRU and EPT. See the following commit: 8ee53820edfd ("thp: mmu_notifier_test_young") Signed-off-by: Kirill A. Shutemov Cc: Andrea Arcangeli Cc: Andrew Morton Cc: Aneesh Kumar K . V Cc: Borislav Petkov Cc: Catalin Marinas Cc: Dann Frazier Cc: Dave Hansen Cc: H. Peter Anvin Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Rik van Riel Cc: Steve Capper Cc: Thomas Gleixner Cc: linux-arch@vger.kernel.org Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/20170316152655.37789-5-kirill.shutemov@linux.intel.com Signed-off-by: Ingo Molnar --- mm/gup.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/mm/gup.c b/mm/gup.c index e83db38deb17..2b6cd3573457 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -1238,6 +1238,8 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end, } VM_BUG_ON_PAGE(compound_head(page) != head, page); + + SetPageReferenced(page); pages[*nr] = page; (*nr)++; @@ -1299,6 +1301,7 @@ static int gup_huge_pmd(pmd_t orig, pmd_t *pmdp, unsigned long addr, return 0; } + SetPageReferenced(head); return 1; } @@ -1334,6 +1337,7 @@ static int gup_huge_pud(pud_t orig, pud_t *pudp, unsigned long addr, return 0; } + SetPageReferenced(head); return 1; } @@ -1370,6 +1374,7 @@ static int gup_huge_pgd(pgd_t orig, pgd_t *pgdp, unsigned long addr, return 0; } + SetPageReferenced(head); return 1; } -- 2.20.1