From 154f5e38f30f262025c8c2e825376f6eb51e8bcb Mon Sep 17 00:00:00 2001 From: Rasmus Villemoes Date: Wed, 6 Aug 2014 16:10:10 -0700 Subject: [PATCH] lib: bitmap: make the start index of bitmap_clear 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 for consistency with bitmap_set. 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 ad2c67d3583e..83c1c7d25073 100644 --- a/include/linux/bitmap.h +++ b/include/linux/bitmap.h @@ -113,7 +113,7 @@ extern int __bitmap_subset(const unsigned long *bitmap1, extern int __bitmap_weight(const unsigned long *bitmap, unsigned int nbits); extern void bitmap_set(unsigned long *map, unsigned int start, int len); -extern void bitmap_clear(unsigned long *map, int start, int nr); +extern void bitmap_clear(unsigned long *map, unsigned int start, int len); extern unsigned long bitmap_find_next_zero_area(unsigned long *map, unsigned long size, unsigned long start, diff --git a/lib/bitmap.c b/lib/bitmap.c index 2a3a92fc3355..5d2540396300 100644 --- a/lib/bitmap.c +++ b/lib/bitmap.c @@ -295,21 +295,21 @@ void bitmap_set(unsigned long *map, unsigned int start, int len) } EXPORT_SYMBOL(bitmap_set); -void bitmap_clear(unsigned long *map, int start, int nr) +void bitmap_clear(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_clear = BITS_PER_LONG - (start % BITS_PER_LONG); unsigned long mask_to_clear = BITMAP_FIRST_WORD_MASK(start); - while (nr - bits_to_clear >= 0) { + while (len - bits_to_clear >= 0) { *p &= ~mask_to_clear; - nr -= bits_to_clear; + len -= bits_to_clear; bits_to_clear = BITS_PER_LONG; mask_to_clear = ~0UL; p++; } - if (nr) { + if (len) { mask_to_clear &= BITMAP_LAST_WORD_MASK(size); *p &= ~mask_to_clear; }