lib: bitmap: remove redundant code from __bitmap_shift_right
If the condition k==lim-1 is true, we must have off == 0 (otherwise, k
could never become that big). But in that case we have upper == 0 and
hence dst[k] == (src[k] & mask) >> rem. Since mask consists of a
consecutive range of bits starting from the LSB, anding dst[k] with mask
is a no-op.
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>
diff --git a/lib/bitmap.c b/lib/bitmap.c
index a7a8bc0..761d2d4 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -136,8 +136,6 @@
lower &= mask;
lower >>= rem;
dst[k] = lower | upper;
- if (left && k == lim - 1)
- dst[k] &= mask;
}
if (off)
memset(&dst[lim - off], 0, off*sizeof(unsigned long));