From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: Andrew Morton <akpm@linux-foundation.org>,
Dan Williams <dan.j.williams@intel.com>,
Matthew Wilcox <willy@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>,
Ross Zwisler <ross.zwisler@linux.intel.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: [PATCH] thp, dax: do not try to withdraw pgtable from non-anon VMA
Date: Thu, 11 Feb 2016 05:40:45 +0300 [thread overview]
Message-ID: <1455158445-76664-1-git-send-email-kirill.shutemov@linux.intel.com> (raw)
DAX doesn't deposit pgtables when it maps huge pages: nothing to
withdraw. It can lead to crash.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
mm/huge_memory.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 5404f7534366..ca7f21516c3a 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1706,7 +1706,8 @@ bool move_huge_pmd(struct vm_area_struct *vma, struct vm_area_struct *new_vma,
pmd = pmdp_huge_get_and_clear(mm, old_addr, old_pmd);
VM_BUG_ON(!pmd_none(*new_pmd));
- if (pmd_move_must_withdraw(new_ptl, old_ptl)) {
+ if (pmd_move_must_withdraw(new_ptl, old_ptl) &&
+ vma_is_anonymous(vma)) {
pgtable_t pgtable;
pgtable = pgtable_trans_huge_withdraw(mm, old_pmd);
pgtable_trans_huge_deposit(mm, new_pmd, pgtable);
--
2.7.0
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reply other threads:[~2016-02-11 2:41 UTC|newest]
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