mm: convert page_mapped_in_vma() to use page_vma_mapped_walk()
For consistency, it worth converting all page_check_address() to
page_vma_mapped_walk(), so we could drop the former.
Link: http://lkml.kernel.org/r/20170129173858.45174-11-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/page_vma_mapped.c b/mm/page_vma_mapped.c
index dc1a548..a23001a 100644
--- a/mm/page_vma_mapped.c
+++ b/mm/page_vma_mapped.c
@@ -186,3 +186,33 @@
}
}
}
+
+/**
+ * page_mapped_in_vma - check whether a page is really mapped in a VMA
+ * @page: the page to test
+ * @vma: the VMA to test
+ *
+ * Returns 1 if the page is mapped into the page tables of the VMA, 0
+ * if the page is not mapped into the page tables of this VMA. Only
+ * valid for normal file or anonymous VMAs.
+ */
+int page_mapped_in_vma(struct page *page, struct vm_area_struct *vma)
+{
+ struct page_vma_mapped_walk pvmw = {
+ .page = page,
+ .vma = vma,
+ .flags = PVMW_SYNC,
+ };
+ unsigned long start, end;
+
+ start = __vma_address(page, vma);
+ end = start + PAGE_SIZE * (hpage_nr_pages(page) - 1);
+
+ if (unlikely(end < vma->vm_start || start >= vma->vm_end))
+ return 0;
+ pvmw.address = max(start, vma->vm_start);
+ if (!page_vma_mapped_walk(&pvmw))
+ return 0;
+ page_vma_mapped_walk_done(&pvmw);
+ return 1;
+}