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authorPeter Xu <peterx@redhat.com>2022-05-13 06:22:52 +0300
committerAndrew Morton <akpm@linux-foundation.org>2022-05-13 17:20:09 +0300
commit5c041f5d1f23d3a172dd0db3215634c484b4acd6 (patch)
tree07c9d48fc2e21f687e6a8b42bac589c387920051 /mm/mprotect.c
parent679d103319101800567c8bb7e341b5eee39f6685 (diff)
downloadlinux-5c041f5d1f23d3a172dd0db3215634c484b4acd6.tar.xz
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/mprotect.c')
-rw-r--r--mm/mprotect.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/mprotect.c b/mm/mprotect.c
index 20a46f21cca8..e84694267b0f 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -193,6 +193,9 @@ static unsigned long change_pte_range(struct mmu_gather *tlb,
newpte = pte_swp_mksoft_dirty(newpte);
if (pte_swp_uffd_wp(oldpte))
newpte = pte_swp_mkuffd_wp(newpte);
+ } else if (is_pte_marker_entry(entry)) {
+ /* Skip it, the same as none pte */
+ continue;
} else {
newpte = oldpte;
}