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 <linux@rasmusvillemoes.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 5 deletions

diff --git a/lib/bitmap.c b/lib/bitmap.c
index f69435c23f9c..2a3a92fc3355 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;
         }