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authorNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>2015-02-11 15:27:40 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-11 17:06:05 -0800
commit900fc5f197b05253ae9433fb9a066c3f37d08f69 (patch)
treeb4a880a4329b4a5c5aaa96a95dc8486a05756e2c /mm/pagewalk.c
parentfafaa4264eba49fd10695c193a82760558d093f4 (diff)
downloadlwn-900fc5f197b05253ae9433fb9a066c3f37d08f69.tar.gz
lwn-900fc5f197b05253ae9433fb9a066c3f37d08f69.zip
pagewalk: add walk_page_vma()
Introduce walk_page_vma(), which is useful for the callers which want to walk over a given vma. It's used by later patches. Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Cyrill Gorcunov <gorcunov@openvz.org> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Pavel Emelyanov <xemul@parallels.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/pagewalk.c')
-rw-r--r--mm/pagewalk.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/mm/pagewalk.c b/mm/pagewalk.c
index d9cc3caae802..4c9a653ba563 100644
--- a/mm/pagewalk.c
+++ b/mm/pagewalk.c
@@ -272,3 +272,21 @@ int walk_page_range(unsigned long start, unsigned long end,
} while (start = next, start < end);
return err;
}
+
+int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk)
+{
+ int err;
+
+ if (!walk->mm)
+ return -EINVAL;
+
+ VM_BUG_ON(!rwsem_is_locked(&walk->mm->mmap_sem));
+ VM_BUG_ON(!vma);
+ walk->vma = vma;
+ err = walk_page_test(vma->vm_start, vma->vm_end, walk);
+ if (err > 0)
+ return 0;
+ if (err < 0)
+ return err;
+ return __walk_page_range(vma->vm_start, vma->vm_end, walk);
+}