The patch titled
Subject: thp: change_huge_pmd(): keep huge zero page write-protected
has been added to the -mm tree. Its filename is
thp-change_huge_pmd-keep-huge-zero-page-write-protected.patch
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------------------------------------------------------
From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Subject: thp: change_huge_pmd(): keep huge zero page write-protected
We want to get page fault on write attempt to huge zero page, so let's
keep it write-protected.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxxxxxxxx>
Cc: Mel Gorman <mel@xxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/huge_memory.c | 2 ++
1 file changed, 2 insertions(+)
diff -puN mm/huge_memory.c~thp-change_huge_pmd-keep-huge-zero-page-write-protected mm/huge_memory.c
--- a/mm/huge_memory.c~thp-change_huge_pmd-keep-huge-zero-page-write-protected
+++ a/mm/huge_memory.c
@@ -1435,6 +1435,8 @@ int change_huge_pmd(struct vm_area_struc
pmd_t entry;
entry = pmdp_get_and_clear(mm, addr, pmd);
entry = pmd_modify(entry, newprot);
+ if (is_huge_zero_pmd(entry))
+ entry = pmd_wrprotect(entry);
set_pmd_at(mm, addr, pmd, entry);
spin_unlock(&vma->vm_mm->page_table_lock);
ret = 1;
_
Patches currently in -mm which might be from kirill.shutemov@xxxxxxxxxxxxxxx are
linux-next.patch
mm-use-is_enabledconfig_numa-instead-of-numa_build.patch
mm-use-is_enabledconfig_compaction-instead-of-compaction_build.patch
thp-huge-zero-page-basic-preparation.patch
thp-zap_huge_pmd-zap-huge-zero-pmd.patch
thp-copy_huge_pmd-copy-huge-zero-page.patch
thp-do_huge_pmd_wp_page-handle-huge-zero-page.patch
thp-change_huge_pmd-keep-huge-zero-page-write-protected.patch
thp-change-split_huge_page_pmd-interface.patch
thp-implement-splitting-pmd-for-huge-zero-page.patch
thp-setup-huge-zero-page-on-non-write-page-fault.patch
thp-lazy-huge-zero-page-allocation.patch
thp-implement-refcounting-for-huge-zero-page.patch
thp-vmstat-implement-hzp_alloc-and-hzp_alloc_failed-events.patch
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