lib: bitmap: change bitmap_shift_right to take unsigned parameters

I've previously changed the nbits parameter of most bitmap_* functions to
unsigned; now it is bitmap_shift_{left,right}'s turn.  This alone saves
some .text, but while at it I found that there were a few other things one
could do.  The end result of these seven patches is

  $ scripts/bloat-o-meter /tmp/bitmap.o.{old,new}
  add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-328 (-328)
  function                                     old     new   delta
  __bitmap_shift_right                         384     226    -158
  __bitmap_shift_left                          306     136    -170

and less importantly also a smaller stack footprint

  $ stack-o-meter.pl master bitmap
  file                 function                       old  new  delta
  lib/bitmap.o         __bitmap_shift_right             24    8  -16
  lib/bitmap.o         __bitmap_shift_left              24    0  -24

For each pair of 0 <= shift <= nbits <= 256 I've tested the end result
with a few randomly filled src buffers (including garbage beyond nbits),
in each case verifying that the shift {left,right}-most bits of dst are
zero and the remaining nbits-shift bits correspond to src, so I'm fairly
confident I didn't screw up.  That hasn't stopped me from being wrong
before, though.

This patch (of 7):

gcc can generate slightly better code for stuff like "nbits %
BITS_PER_LONG" when it knows nbits is not negative.  Since negative size
bitmaps or shift amounts don't make sense, change these parameters of
bitmap_shift_right to unsigned.

The expressions involving "lim - 1" are still ok, since if lim is 0 the
loop is never executed.

Also use "shift" and "nbits" consistently for the parameter names.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 5 deletions

diff --git a/lib/bitmap.c b/lib/bitmap.c
index d2cd50cd4f5d..45e7d14ebdfd 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -104,17 +104,17 @@ EXPORT_SYMBOL(__bitmap_complement);
  *   @dst : destination bitmap
  *   @src : source bitmap
  *   @shift : shift by this many bits
- *   @bits : bitmap size, in bits
+ *   @nbits : bitmap size, in bits
  *
  * Shifting right (dividing) means moving bits in the MS -> LS bit
  * direction.  Zeros are fed into the vacated MS positions and the
  * LS bits shifted off the bottom are lost.
  */
-void __bitmap_shift_right(unsigned long *dst,
-                        const unsigned long *src, int shift, int bits)
+void __bitmap_shift_right(unsigned long *dst, const unsigned long *src,
+                        unsigned shift, unsigned nbits)
 {
-        int k, lim = BITS_TO_LONGS(bits), left = bits % BITS_PER_LONG;
-        int off = shift/BITS_PER_LONG, rem = shift % BITS_PER_LONG;
+        unsigned k, lim = BITS_TO_LONGS(nbits), left = nbits % BITS_PER_LONG;
+        unsigned off = shift/BITS_PER_LONG, rem = shift % BITS_PER_LONG;
         unsigned long mask = (1UL << left) - 1;
         for (k = 0; off + k < lim; ++k) {
                 unsigned long upper, lower;