From fb5ac54263ef3fcb5c469a61e0ab6b06e45e2307 Mon Sep 17 00:00:00 2001 From: Rasmus Villemoes Date: Wed, 6 Aug 2014 16:10:07 -0700 Subject: [PATCH] lib: bitmap: make the start index of bitmap_set unsigned The compiler can generate slightly smaller and simpler code when it knows that "start" is non-negative. Also, use the names "start" and "len" for the two parameters in both header file and implementation, instead of the previous mix. Signed-off-by: Rasmus Villemoes Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/bitmap.h | 2 +- lib/bitmap.c | 10 +++++----- 2 files changed, 6 insertions(+), 6 deletions(-) diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h index 64b0ebe..ad2c67d 100644 --- a/include/linux/bitmap.h +++ b/include/linux/bitmap.h @@ -112,7 +112,7 @@ extern int __bitmap_subset(const unsigned long *bitmap1, const unsigned long *bitmap2, unsigned int nbits); 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_set(unsigned long *map, unsigned int start, int len); extern void bitmap_clear(unsigned long *map, int start, int nr); extern unsigned long bitmap_find_next_zero_area(unsigned long *map, unsigned long size, diff --git a/lib/bitmap.c b/lib/bitmap.c index f69435c..2a3a92f 100644 --- a/lib/bitmap.c +++ b/lib/bitmap.c @@ -274,21 +274,21 @@ int __bitmap_weight(const unsigned long *bitmap, unsigned int bits) } EXPORT_SYMBOL(__bitmap_weight); -void bitmap_set(unsigned long *map, int start, int nr) +void bitmap_set(unsigned long *map, unsigned int start, int len) { unsigned long *p = map + BIT_WORD(start); - const int size = start + nr; + const unsigned int size = start + len; int bits_to_set = BITS_PER_LONG - (start % BITS_PER_LONG); unsigned long mask_to_set = BITMAP_FIRST_WORD_MASK(start); - while (nr - bits_to_set >= 0) { + while (len - bits_to_set >= 0) { *p |= mask_to_set; - nr -= bits_to_set; + len -= bits_to_set; bits_to_set = BITS_PER_LONG; mask_to_set = ~0UL; p++; } - if (nr) { + if (len) { mask_to_set &= BITMAP_LAST_WORD_MASK(size); *p |= mask_to_set; } -- 2.7.4