Commit-ID: e93480537fd7ecaf5ed1a662a979376f6fee50e3
Gitweb: http://git.kernel.org/tip/e93480537fd7ecaf5ed1a662a979376f6fee50e3
Author: Kirill A. Shutemov <[email protected]>
AuthorDate: Thu, 16 Mar 2017 18:26:52 +0300
Committer: Ingo Molnar <[email protected]>
CommitDate: Sat, 18 Mar 2017 09:48:02 +0100
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 <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Aneesh Kumar K . V <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Dann Frazier <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Steve Capper <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link:
http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
---
mm/gup.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/mm/gup.c b/mm/gup.c
index e83db38..2b6cd357 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;
}
