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| author | Peter Xu <peterx@redhat.com> | 2022-05-12 20:22:52 -0700 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-05-13 07:20:09 -0700 |
| commit | 5c041f5d1f23d3a172dd0db3215634c484b4acd6 (patch) | |
| tree | 07c9d48fc2e21f687e6a8b42bac589c387920051 /mm/mincore.c | |
| parent | 679d103319101800567c8bb7e341b5eee39f6685 (diff) | |
| download | linux-5c041f5d1f23d3a172dd0db3215634c484b4acd6.tar.gz linux-5c041f5d1f23d3a172dd0db3215634c484b4acd6.tar.bz2 linux-5c041f5d1f23d3a172dd0db3215634c484b4acd6.zip | |
mm: teach core mm about pte markers
This patch still does not use pte marker in any way, however it teaches
the core mm about the pte marker idea.
For example, handle_pte_marker() is introduced that will parse and handle
all the pte marker faults.
Many of the places are more about commenting it up - so that we know
there's the possibility of pte marker showing up, and why we don't need
special code for the cases.
[peterx@redhat.com: userfaultfd.c needs swapops.h]
Link: https://lkml.kernel.org/r/YmRlVj3cdizYJsr0@xz-m1.local
Link: https://lkml.kernel.org/r/20220405014833.14015-1-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: "Kirill A . Shutemov" <kirill@shutemov.name>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Nadav Amit <nadav.amit@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/mincore.c')
| -rw-r--r-- | mm/mincore.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/mincore.c b/mm/mincore.c index f4f627325e12..fa200c14185f 100644 --- a/mm/mincore.c +++ b/mm/mincore.c @@ -122,7 +122,8 @@ static int mincore_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, for (; addr != end; ptep++, addr += PAGE_SIZE) { pte_t pte = *ptep; - if (pte_none(pte)) + /* We need to do cache lookup too for pte markers */ + if (pte_none_mostly(pte)) __mincore_unmapped_range(addr, addr + PAGE_SIZE, vma, vec); else if (pte_present(pte)) |