From: "Kirill A. Shutemov" <kirill.shute...@linux.intel.com>
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.shute...@linux.intel.com>
---
mm/huge_memory.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index f5589c0..42607a1 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1245,6 +1245,8 @@ int change_huge_pmd(struct vm_area_struct *vma, pmd_t
*pmd,
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;
--
1.7.11.7
--
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