The patch titled
Subject: thp: avoid dumping huge zero page
has been added to the -mm tree. Its filename is
thp-avoid-dumping-huge-zero-page.patch
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------------------------------------------------------
From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Subject: thp: avoid dumping huge zero page
No reason to preserve the huge zero page in core dumps.
Reported-by: Michel Lespinasse <walken@xxxxxxxxxx>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Reviewed-by: Michel Lespinasse <walken@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/huge_memory.c | 4 ++++
1 file changed, 4 insertions(+)
diff -puN mm/huge_memory.c~thp-avoid-dumping-huge-zero-page mm/huge_memory.c
--- a/mm/huge_memory.c~thp-avoid-dumping-huge-zero-page
+++ a/mm/huge_memory.c
@@ -1251,6 +1251,10 @@ struct page *follow_trans_huge_pmd(struc
if (flags & FOLL_WRITE && !pmd_write(*pmd))
goto out;
+ /* Avoid dumping huge zero page */
+ if ((flags & FOLL_DUMP) && is_huge_zero_pmd(*pmd))
+ return ERR_PTR(-EFAULT);
+
page = pmd_page(*pmd);
VM_BUG_ON(!PageHead(page));
if (flags & FOLL_TOUCH) {
_
Patches currently in -mm which might be from kirill.shutemov@xxxxxxxxxxxxxxx are
include-asm-generic-pgtableh-fix-mips-build.patch
thp-avoid-dumping-huge-zero-page.patch
linux-next.patch
x86-convert-update_mmu_cache-and-update_mmu_cache_pmd-to-functions.patch
mm-huge_memory-use-new-hashtable-implementation.patch
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