diff options
| author | James Houghton <[email protected]> | 2023-03-02 22:24:04 +0000 |
|---|---|---|
| committer | Andrew Morton <[email protected]> | 2023-03-07 17:04:53 -0800 |
| commit | 63cf584203f3367c8b073d417c8e5cbbfc450506 (patch) | |
| tree | 40199b68cfa42434be1d5b011e3a230b35388fd4 | |
| parent | fe15c26ee26efa11741a7b632e9f23b01aca4cc6 (diff) | |
mm: teach mincore_hugetlb about pte markers
By checking huge_pte_none(), we incorrectly classify PTE markers as
"present". Instead, check huge_pte_none_mostly(), classifying PTE markers
the same as if the PTE were completely blank.
PTE markers, unlike other kinds of swap entries, don't reference any
physical page and don't indicate that a physical page was mapped
previously. As such, treat them as non-present for the sake of mincore().
Link: https://lkml.kernel.org/r/[email protected]
Fixes: 5c041f5d1f23 ("mm: teach core mm about pte markers")
Signed-off-by: James Houghton <[email protected]>
Acked-by: Peter Xu <[email protected]>
Acked-by: David Hildenbrand <[email protected]>
Cc: Axel Rasmussen <[email protected]>
Cc: James Houghton <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
| -rw-r--r-- | mm/mincore.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/mincore.c b/mm/mincore.c index cd69b9db0081..d359650b0f75 100644 --- a/mm/mincore.c +++ b/mm/mincore.c @@ -33,7 +33,7 @@ static int mincore_hugetlb(pte_t *pte, unsigned long hmask, unsigned long addr, * Hugepages under user process are always in RAM and never * swapped out, but theoretically it needs to be checked. */ - present = pte && !huge_pte_none(huge_ptep_get(pte)); + present = pte && !huge_pte_none_mostly(huge_ptep_get(pte)); for (; addr != end; vec++, addr += PAGE_SIZE) *vec = present; walk->private = vec; |