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thp: avoid dumping huge zero page

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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>
This commit is contained in:
Kirill A. Shutemov 2013-02-04 14:28:42 -08:00 committed by Linus Torvalds
parent a9bae18954
commit 85facf2570
1 changed files with 4 additions and 0 deletions
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4
mm/huge_memory.c
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@ -1257,6 +1257,10 @@ struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
if (flags & FOLL_WRITE && !pmd_write(*pmd)) if (flags & FOLL_WRITE && !pmd_write(*pmd))
goto out; goto out;
/* Avoid dumping huge zero page */
if ((flags & FOLL_DUMP) && is_huge_zero_pmd(*pmd))
return ERR_PTR(-EFAULT);
page = pmd_page(*pmd); page = pmd_page(*pmd);
VM_BUG_ON(!PageHead(page)); VM_BUG_ON(!PageHead(page));
if (flags & FOLL_TOUCH) { if (flags & FOLL_TOUCH) {