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| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2016-02-11 16:13:03 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-02-11 18:35:48 -0800 |
| commit | 6b9116a652bd9e0e2994505cfaaa5f66deaa2a05 (patch) | |
| tree | 9e9ae34807081abbec6ed856f4ed7c1f9b33d225 /mm/mremap.c | |
| parent | 7eb391299419a03cbe0fa5ab0e6b0932e42c7a36 (diff) | |
| download | lwn-6b9116a652bd9e0e2994505cfaaa5f66deaa2a05.tar.gz lwn-6b9116a652bd9e0e2994505cfaaa5f66deaa2a05.zip | |
mm, dax: check for pmd_none() after split_huge_pmd()
DAX implements split_huge_pmd() by clearing pmd. This simple approach
reduces memory overhead, as we don't need to deposit page table on huge
page mapping to make split_huge_pmd() never-fail. PTE table can be
allocated and populated later on page fault from backing store.
But one side effect is that have to check if pmd is pmd_none() after
split_huge_pmd(). In most places we do this already to deal with
parallel MADV_DONTNEED.
But I found two call sites which is not affected by MADV_DONTNEED (due
down_write(mmap_sem)), but need to have the check to work with DAX
properly.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Matthew Wilcox <willy@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mremap.c')
| -rw-r--r-- | mm/mremap.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/mremap.c b/mm/mremap.c index d77946a997f7..8eeba02fc991 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -210,6 +210,8 @@ unsigned long move_page_tables(struct vm_area_struct *vma, } } split_huge_pmd(vma, old_pmd, old_addr); + if (pmd_none(*old_pmd)) + continue; VM_BUG_ON(pmd_trans_huge(*old_pmd)); } if (pmd_none(*new_pmd) && __pte_alloc(new_vma->vm_mm, new_vma, |