Messages in this thread Patch in this message | | | From | Rasmus Villemoes <> | Subject | [PATCH 01/18] lib: bitmap: Make nbits parameter of bitmap_empty unsigned | Date | Fri, 4 Jul 2014 00:42:47 +0200 |
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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.
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> --- include/linux/bitmap.h | 4 ++-- lib/bitmap.c | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h index 7ad6345..3d3fd6b 100644 --- a/include/linux/bitmap.h +++ b/include/linux/bitmap.h @@ -88,7 +88,7 @@ * lib/bitmap.c provides these functions: */ -extern int __bitmap_empty(const unsigned long *bitmap, int bits); +extern int __bitmap_empty(const unsigned long *bitmap, unsigned int nbits); extern int __bitmap_full(const unsigned long *bitmap, int bits); extern int __bitmap_equal(const unsigned long *bitmap1, const unsigned long *bitmap2, int bits); @@ -257,7 +257,7 @@ static inline int bitmap_subset(const unsigned long *src1, return __bitmap_subset(src1, src2, nbits); } -static inline int bitmap_empty(const unsigned long *src, int nbits) +static inline int bitmap_empty(const unsigned long *src, unsigned nbits) { if (small_const_nbits(nbits)) return ! (*src & BITMAP_LAST_WORD_MASK(nbits)); diff --git a/lib/bitmap.c b/lib/bitmap.c index 06f7e4f..3789110 100644 --- a/lib/bitmap.c +++ b/lib/bitmap.c @@ -40,9 +40,9 @@ * for the best explanations of this ordering. */ -int __bitmap_empty(const unsigned long *bitmap, int bits) +int __bitmap_empty(const unsigned long *bitmap, unsigned int bits) { - int k, lim = bits/BITS_PER_LONG; + unsigned int k, lim = bits/BITS_PER_LONG; for (k = 0; k < lim; ++k) if (bitmap[k]) return 0; -- 1.9.2
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