From 2a52bcbcc688eecead2953143f7ef695b8e44575 Mon Sep 17 00:00:00 2001 From: "Kirill A. Shutemov" Date: Thu, 17 Mar 2016 14:20:04 -0700 Subject: 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 Cc: Andrea Arcangeli Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/huge_memory.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) (limited to 'mm/huge_memory.c') 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; -- cgit v1.2.3