diff options
| author | Rasmus Villemoes <linux@rasmusvillemoes.dk> | 2015-02-13 14:36:08 -0800 |
|---|---|---|
| committer | Mister Oyster <oysterized@gmail.com> | 2017-04-11 10:59:36 +0200 |
| commit | 182df8d94f7b75d0274a774c704c077bc1fbbdf3 (patch) | |
| tree | 585699d2e85824ac72efa6e075233a5fce9fe47c | |
| parent | 4e8ee1ec9f82e439d45e655b47b49b2866cc1cc4 (diff) | |
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>
| -rw-r--r-- | lib/bitmap.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/lib/bitmap.c b/lib/bitmap.c index 204f09607..e3e91a343 100644 --- a/lib/bitmap.c +++ b/lib/bitmap.c @@ -134,8 +134,6 @@ void __bitmap_shift_right(unsigned long *dst, const unsigned long *src, 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)); |