lib: bitmap: make nbits parameter of bitmap_complement 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.

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>

diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h
index 1e0f46c..21fb52f 100644 (file)
--- a/include/linux/bitmap.h
+++ b/include/linux/bitmap.h
@@ -93,7 +93,7 @@ extern int __bitmap_full(const unsigned long *bitmap, unsigned int nbits);
 extern int __bitmap_equal(const unsigned long *bitmap1,
                          const unsigned long *bitmap2, unsigned int nbits);
 extern void __bitmap_complement(unsigned long *dst, const unsigned long *src,
-                       int bits);
+                       unsigned int nbits);
 extern void __bitmap_shift_right(unsigned long *dst,
                         const unsigned long *src, int shift, int bits);
 extern void __bitmap_shift_left(unsigned long *dst,
@@ -222,7 +222,7 @@ static inline int bitmap_andnot(unsigned long *dst, const unsigned long *src1,
 }
 
 static inline void bitmap_complement(unsigned long *dst, const unsigned long *src,
-                       int nbits)
+                       unsigned int nbits)
 {
        if (small_const_nbits(nbits))
                *dst = ~(*src) & BITMAP_LAST_WORD_MASK(nbits);
@@ -231,7 +231,7 @@ static inline void bitmap_complement(unsigned long *dst, const unsigned long *sr
 }
 
 static inline int bitmap_equal(const unsigned long *src1,
-                       const unsigned long *src2, int nbits)
+                       const unsigned long *src2, unsigned int nbits)
 {
        if (small_const_nbits(nbits))
                return ! ((*src1 ^ *src2) & BITMAP_LAST_WORD_MASK(nbits));

diff --git a/lib/bitmap.c b/lib/bitmap.c
index d6bb955..0f2f845 100644 (file)
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -86,9 +86,9 @@ int __bitmap_equal(const unsigned long *bitmap1,
 }
 EXPORT_SYMBOL(__bitmap_equal);
 
-void __bitmap_complement(unsigned long *dst, const unsigned long *src, int bits)
+void __bitmap_complement(unsigned long *dst, const unsigned long *src, unsigned int bits)
 {
-       int k, lim = bits/BITS_PER_LONG;
+       unsigned int k, lim = bits/BITS_PER_LONG;
        for (k = 0; k < lim; ++k)
                dst[k] = ~src[k];