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author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2016-03-17 14:20:04 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-03-17 15:09:34 -0700 |
commit | 2a52bcbcc688eecead2953143f7ef695b8e44575 (patch) | |
tree | b2e372875693775e97fc4e9373c5a630d2a1dcc0 /mm/huge_memory.c | |
parent | b97731992d00f09456726bfc5ab6641c07773038 (diff) | |
download | blackbird-op-linux-2a52bcbcc688eecead2953143f7ef695b8e44575.tar.gz blackbird-op-linux-2a52bcbcc688eecead2953143f7ef695b8e44575.zip |
rmap: extend try_to_unmap() to be usable by split_huge_page()
Add support for two ttu_flags:
- TTU_SPLIT_HUGE_PMD would split PMD if it's there, before trying to
unmap page;
- TTU_RMAP_LOCKED indicates that caller holds relevant rmap lock;
Also, change rwc->done to !page_mapcount() instead of !page_mapped().
try_to_unmap() works on pte level, so we are really interested in the
mappedness of this small page rather than of the compound page it's a
part of.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/huge_memory.c')
-rw-r--r-- | mm/huge_memory.c | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c index e1a177c20791..11d15674ff38 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -3006,15 +3006,12 @@ out: } } -static void split_huge_pmd_address(struct vm_area_struct *vma, - unsigned long address) +void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address) { pgd_t *pgd; pud_t *pud; pmd_t *pmd; - VM_BUG_ON(!(address & ~HPAGE_PMD_MASK)); - pgd = pgd_offset(vma->vm_mm, address); if (!pgd_present(*pgd)) return; |