mm: cleanup follow_page_mask()
Cleanups: - move pte-related code to separate function. It's about half of the function; - get rid of some goto-logic; - use 'return NULL' instead of 'return page' where page can only be NULL; Signed-off-by: NKirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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