sh: use PFN_DOWN macro
Replace ((x) >> PAGE_SHIFT) with the predefined PFN_DOWN macro. Signed-off-by: NAlexander Kuleshov <kuleshovmail@gmail.com> Acked-by: NGeert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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