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authorPeter Xu <peterx@redhat.com>2022-10-31 00:41:50 +0300
committerAndrew Morton <akpm@linux-foundation.org>2022-12-01 02:58:45 +0300
commitca92ea3dc5a2b01f98e9f02b7a6bc03be06fe124 (patch)
treee3b6c8d5431d6da8e97c2c9c12e03d705edab873 /mm/Kconfig
parentf15be1b8d449a8eebe82d77164bf760804753651 (diff)
downloadlinux-ca92ea3dc5a2b01f98e9f02b7a6bc03be06fe124.tar.xz
mm: always compile in pte markers
Patch series "mm: Use pte marker for swapin errors". This series uses the pte marker to replace the swapin error swap entry, then we save one more swap entry slot for swap devices. A new pte marker bit is defined. This patch (of 2): The PTE markers code is tiny and now it's enabled for most of the distributions. It's fine to keep it as-is, but to make a broader use of it (e.g. replacing read error swap entry) it needs to be there always otherwise we need special code path to take care of !PTE_MARKER case. It'll be easier just make pte marker always exist. Use this chance to extend its usage to anonymous too by simply touching up some of the old comments, because it'll be used for anonymous pages in the follow up patches. Link: https://lkml.kernel.org/r/20221030214151.402274-1-peterx@redhat.com Link: https://lkml.kernel.org/r/20221030214151.402274-2-peterx@redhat.com Signed-off-by: Peter Xu <peterx@redhat.com> Reviewed-by: Huang Ying <ying.huang@intel.com> Reviewed-by: Miaohe Lin <linmiaohe@huawei.com> Acked-by: David Hildenbrand <david@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Naoya Horiguchi <naoya.horiguchi@nec.com> Cc: Peter Xu <peterx@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/Kconfig')
-rw-r--r--mm/Kconfig7
1 files changed, 0 insertions, 7 deletions
diff --git a/mm/Kconfig b/mm/Kconfig
index 57e1d8c5b505..4b28800d9be1 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -1107,17 +1107,10 @@ config HAVE_ARCH_USERFAULTFD_MINOR
help
Arch has userfaultfd minor fault support
-config PTE_MARKER
- bool
-
- help
- Allows to create marker PTEs for file-backed memory.
-
config PTE_MARKER_UFFD_WP
bool "Userfaultfd write protection support for shmem/hugetlbfs"
default y
depends on HAVE_ARCH_USERFAULTFD_WP
- select PTE_MARKER
help
Allows to create marker PTEs for userfaultfd write protection