The patch titled
Subject: mm: page_table_check: use PxD_SIZE instead of PxD_PAGE_SIZE
has been added to the -mm tree. Its filename is
mm-page_table_check-using-pxd_size-instead-of-pxd_page_size.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-page_table_check-using-pxd_size-instead-of-pxd_page_size.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-page_table_check-using-pxd_size-instead-of-pxd_page_size.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Tong Tiangen <tongtiangen@xxxxxxxxxx>
Subject: mm: page_table_check: use PxD_SIZE instead of PxD_PAGE_SIZE
Patch series "mm: page_table_check: add support on arm64 and riscv", v5.
Page table check performs extra verifications at the time when new pages
become accessible from the userspace by getting their page table entries
(PTEs PMDs etc.) added into the table. It is supported on X86[1].
This patchset made some simple changes and make it easier to support new
architecture, then we support this feature on ARM64 and RISCV.
[1]https://lore.kernel.org/lkml/20211123214814.3756047-1-pasha.tatashin@xxxxxxxxxx/
This patch (of 5):
Macro PUD_SIZE/PMD_SIZE is more general in various architectures. Using
PUD_SIZE/PMD_SIZE instead of PUD_PAGE_SIZE/PMD_PAGE_SIZE can better
support page table check in architectures other than x86 and it is no
functional impact on x86.
Link: https://lkml.kernel.org/r/20220421082042.1167967-1-tongtiangen@xxxxxxxxxx
Link: https://lkml.kernel.org/r/20220421082042.1167967-2-tongtiangen@xxxxxxxxxx
Signed-off-by: Tong Tiangen <tongtiangen@xxxxxxxxxx>
Suggested-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Paul Walmsley <paul.walmsley@xxxxxxxxxx>
Cc: Palmer Dabbelt <palmer@xxxxxxxxxxx>
Cc: Albert Ou <aou@xxxxxxxxxxxxxxxxx>
Cc: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Cc: Guohanjun <guohanjun@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_table_check.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/mm/page_table_check.c~mm-page_table_check-using-pxd_size-instead-of-pxd_page_size
+++ a/mm/page_table_check.c
@@ -177,7 +177,7 @@ void __page_table_check_pmd_clear(struct
if (pmd_user_accessible_page(pmd)) {
page_table_check_clear(mm, addr, pmd_pfn(pmd),
- PMD_PAGE_SIZE >> PAGE_SHIFT);
+ PMD_SIZE >> PAGE_SHIFT);
}
}
EXPORT_SYMBOL(__page_table_check_pmd_clear);
@@ -190,7 +190,7 @@ void __page_table_check_pud_clear(struct
if (pud_user_accessible_page(pud)) {
page_table_check_clear(mm, addr, pud_pfn(pud),
- PUD_PAGE_SIZE >> PAGE_SHIFT);
+ PUD_SIZE >> PAGE_SHIFT);
}
}
EXPORT_SYMBOL(__page_table_check_pud_clear);
@@ -219,7 +219,7 @@ void __page_table_check_pmd_set(struct m
__page_table_check_pmd_clear(mm, addr, *pmdp);
if (pmd_user_accessible_page(pmd)) {
page_table_check_set(mm, addr, pmd_pfn(pmd),
- PMD_PAGE_SIZE >> PAGE_SHIFT,
+ PMD_SIZE >> PAGE_SHIFT,
pmd_write(pmd));
}
}
@@ -234,7 +234,7 @@ void __page_table_check_pud_set(struct m
__page_table_check_pud_clear(mm, addr, *pudp);
if (pud_user_accessible_page(pud)) {
page_table_check_set(mm, addr, pud_pfn(pud),
- PUD_PAGE_SIZE >> PAGE_SHIFT,
+ PUD_SIZE >> PAGE_SHIFT,
pud_write(pud));
}
}
_
Patches currently in -mm which might be from tongtiangen@xxxxxxxxxx are
mm-page_table_check-using-pxd_size-instead-of-pxd_page_size.patch
mm-page_table_check-add-hooks-to-public-helpers.patch
riscv-mm-add-support-for-page-table-check.patch
