diff options
| author | Rasmus Villemoes <linux@rasmusvillemoes.dk> | 2014-07-31 09:28:45 +1000 |
|---|---|---|
| committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2014-07-31 09:28:45 +1000 |
| commit | 118485b391dc11db63b3ff0b93f12f52bc77cf54 (patch) | |
| tree | 8c7877b0da13d140e4c937bf0df24c30c2df7099 | |
| parent | 015693841939ebbeff502084a87d3d6c44cde2b8 (diff) | |
lib: bitmap: make nbits parameter of bitmap_weight unsigned
The compiler can generate slightly smaller and simpler code when it knows
that "nbits" is non-negative. Since no-one passes a negative bit-count,
this shouldn't affect the semantics.
I didn't change the return type, since that might change the semantics
of some expression containing a call to bitmap_weight(). Certainly an
int is capable of holding the result.
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
| -rw-r--r-- | include/linux/bitmap.h | 4 | ||||
| -rw-r--r-- | lib/bitmap.c | 5 |
2 files changed, 5 insertions, 4 deletions
diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h index 87e88f79def1..64b0ebe9f9a8 100644 --- a/include/linux/bitmap.h +++ b/include/linux/bitmap.h @@ -110,7 +110,7 @@ extern int __bitmap_intersects(const unsigned long *bitmap1, const unsigned long *bitmap2, unsigned int nbits); extern int __bitmap_subset(const unsigned long *bitmap1, const unsigned long *bitmap2, unsigned int nbits); -extern int __bitmap_weight(const unsigned long *bitmap, int bits); +extern int __bitmap_weight(const unsigned long *bitmap, unsigned int nbits); extern void bitmap_set(unsigned long *map, int i, int len); extern void bitmap_clear(unsigned long *map, int start, int nr); @@ -273,7 +273,7 @@ static inline int bitmap_full(const unsigned long *src, unsigned int nbits) return __bitmap_full(src, nbits); } -static inline int bitmap_weight(const unsigned long *src, int nbits) +static inline int bitmap_weight(const unsigned long *src, unsigned int nbits) { if (small_const_nbits(nbits)) return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits)); diff --git a/lib/bitmap.c b/lib/bitmap.c index c9bff5379795..f69435c23f9c 100644 --- a/lib/bitmap.c +++ b/lib/bitmap.c @@ -259,9 +259,10 @@ int __bitmap_subset(const unsigned long *bitmap1, } EXPORT_SYMBOL(__bitmap_subset); -int __bitmap_weight(const unsigned long *bitmap, int bits) +int __bitmap_weight(const unsigned long *bitmap, unsigned int bits) { - int k, w = 0, lim = bits/BITS_PER_LONG; + unsigned int k, lim = bits/BITS_PER_LONG; + int w = 0; for (k = 0; k < lim; k++) w += hweight_long(bitmap[k]); |