Commit 85facf25 authored Feb 04, 2013 by Kirill A. Shutemov Committed by Linus Torvalds Feb 05, 2013

thp: avoid dumping huge zero page



No reason to preserve the huge zero page in core dumps.

Reported-by: Michel Lespinasse <walken@google.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Michel Lespinasse <walken@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent a9bae189

mm/huge_memory.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -1257,6 +1257,10 @@ struct page follow_trans_huge_pmd(struct vm_area_struct vma,
		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) {