From 6a328a626f98bb856551e506cabc7c8b969aafa3 Mon Sep 17 00:00:00 2001 From: Kirill A. Shutemov Date: Fri, 24 Feb 2017 14:58:10 -0800 Subject: 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 Acked-by: Hillf Danton Cc: Andrea Arcangeli Cc: Hugh Dickins Cc: Johannes Weiner Cc: Oleg Nesterov Cc: Peter Zijlstra Cc: Rik van Riel Cc: Srikar Dronamraju Cc: Vladimir Davydov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/page_vma_mapped.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) (limited to 'mm/page_vma_mapped.c') diff --git a/mm/page_vma_mapped.c b/mm/page_vma_mapped.c index dc1a54826cf2..a23001a22c15 100644 --- a/mm/page_vma_mapped.c +++ b/mm/page_vma_mapped.c @@ -186,3 +186,33 @@ next_pte: do { } } } + +/** + * 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; +} -- cgit v1.2.3-55-g7522