diff mbox series

[3/8] lib/bitmap: change type of bitmap_weight to unsigned int

Message ID 20220701125430.2907638-4-yury.norov@gmail.com (mailing list archive)
State New, archived
Headers show
Series lib: cleanup bitmap-related headers | expand

Commit Message

Yury Norov July 1, 2022, 12:54 p.m. UTC 
bitmap_weight() doesn't return negative values, so change it's type
to unsigned int. It may help compiler to generate better code and
catch bugs.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
---
 include/linux/bitmap.h       | 2 +-
 lib/bitmap.c                 | 5 ++---
 tools/include/linux/bitmap.h | 4 ++--
 tools/lib/bitmap.c           | 4 ++--
 4 files changed, 7 insertions(+), 8 deletions(-)

Comments

Andy Shevchenko July 2, 2022, 11:57 a.m. UTC | #1 
On Fri, Jul 01, 2022 at 05:54:25AM -0700, Yury Norov wrote:
> bitmap_weight() doesn't return negative values, so change it's type
> to unsigned int.

Patch (the code) suggests something else.

> It may help compiler to generate better code and
> catch bugs.

...

> -int __bitmap_weight(const unsigned long *bitmap, unsigned int nbits);
> +unsigned long __bitmap_weight(const unsigned long *bitmap, unsigned int nbits);
diff mbox series

Patch

diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h
index e1a438bdda52..812835d3149a 100644
--- a/include/linux/bitmap.h
+++ b/include/linux/bitmap.h
@@ -163,7 +163,7 @@  bool __bitmap_intersects(const unsigned long *bitmap1,
 			 const unsigned long *bitmap2, unsigned int nbits);
 bool __bitmap_subset(const unsigned long *bitmap1,
 		     const unsigned long *bitmap2, unsigned int nbits);
-int __bitmap_weight(const unsigned long *bitmap, unsigned int nbits);
+unsigned long __bitmap_weight(const unsigned long *bitmap, unsigned int nbits);
 void __bitmap_set(unsigned long *map, unsigned int start, int len);
 void __bitmap_clear(unsigned long *map, unsigned int start, int len);
 
diff --git a/lib/bitmap.c b/lib/bitmap.c
index 098fd9db2363..b580b381eca1 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -333,10 +333,9 @@  bool __bitmap_subset(const unsigned long *bitmap1,
 }
 EXPORT_SYMBOL(__bitmap_subset);
 
-int __bitmap_weight(const unsigned long *bitmap, unsigned int bits)
+unsigned long __bitmap_weight(const unsigned long *bitmap, unsigned int bits)
 {
-	unsigned int k, lim = bits/BITS_PER_LONG;
-	int w = 0;
+	unsigned long k, w = 0, lim = bits/BITS_PER_LONG;
 
 	for (k = 0; k < lim; k++)
 		w += hweight_long(bitmap[k]);
diff --git a/tools/include/linux/bitmap.h b/tools/include/linux/bitmap.h
index 2ae7ab8ed7d1..c9c24dfe0443 100644
--- a/tools/include/linux/bitmap.h
+++ b/tools/include/linux/bitmap.h
@@ -11,7 +11,7 @@ 
 #define DECLARE_BITMAP(name,bits) \
 	unsigned long name[BITS_TO_LONGS(bits)]
 
-int __bitmap_weight(const unsigned long *bitmap, int bits);
+unsigned int __bitmap_weight(const unsigned long *bitmap, unsigned int bits);
 void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1,
 		 const unsigned long *bitmap2, int bits);
 bool __bitmap_and(unsigned long *dst, const unsigned long *bitmap1,
@@ -61,7 +61,7 @@  static inline bool bitmap_full(const unsigned long *src, unsigned int nbits)
 	return find_first_zero_bit(src, nbits) == nbits;
 }
 
-static inline int bitmap_weight(const unsigned long *src, unsigned int nbits)
+static inline unsigned int bitmap_weight(const unsigned long *src, unsigned int nbits)
 {
 	if (small_const_nbits(nbits))
 		return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits));
diff --git a/tools/lib/bitmap.c b/tools/lib/bitmap.c
index 2e351d63fdba..974e51809f57 100644
--- a/tools/lib/bitmap.c
+++ b/tools/lib/bitmap.c
@@ -5,9 +5,9 @@ 
  */
 #include <linux/bitmap.h>
 
-int __bitmap_weight(const unsigned long *bitmap, int bits)
+unsigned int __bitmap_weight(const unsigned long *bitmap, unsigned int bits)
 {
-	int k, w = 0, lim = bits/BITS_PER_LONG;
+	unsigned int k, w = 0, lim = bits/BITS_PER_LONG;
 
 	for (k = 0; k < lim; k++)
 		w += hweight_long(bitmap[k]);