linux-kernel - [PATCH v2] lib/bitmap: Make parameter len unsigned

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Date:   Fri,  8 Jul 2022 09:52:40 +0200
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Yury Norov <yury.norov@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:     Paul Menzel <pmenzel@...gen.mpg.de>, linux-kernel@...r.kernel.org
Subject: [PATCH v2] lib/bitmap: Make parameter len unsigned

The length is non-negative, so make it unsigned.

Signed-off-by: Paul Menzel <pmenzel@...gen.mpg.de>
---
v2: Update signature in header file

 include/linux/bitmap.h | 2 +-
 lib/bitmap.c           | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h
index 2e6cd5681040..feaf84cbc487 100644
--- a/include/linux/bitmap.h
+++ b/include/linux/bitmap.h
@@ -164,7 +164,7 @@ bool __bitmap_intersects(const unsigned long *bitmap1,
 bool __bitmap_subset(const unsigned long *bitmap1,
 		     const unsigned long *bitmap2, unsigned int nbits);
 int __bitmap_weight(const unsigned long *bitmap, unsigned int nbits);
-void __bitmap_set(unsigned long *map, unsigned int start, int len);
+void __bitmap_set(unsigned long *map, unsigned int start, unsigned int len);
 void __bitmap_clear(unsigned long *map, unsigned int start, int len);
 
 unsigned long bitmap_find_next_zero_area_off(unsigned long *map,
diff --git a/lib/bitmap.c b/lib/bitmap.c
index b18e31ea6e66..0746beb336df 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -348,14 +348,14 @@ int __bitmap_weight(const unsigned long *bitmap, unsigned int bits)
 }
 EXPORT_SYMBOL(__bitmap_weight);
 
-void __bitmap_set(unsigned long *map, unsigned int start, int len)
+void __bitmap_set(unsigned long *map, unsigned int start, unsigned int len)
 {
 	unsigned long *p = map + BIT_WORD(start);
 	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 (len - bits_to_set >= 0) {
+	while (len >= bits_to_set) {
 		*p |= mask_to_set;
 		len -= bits_to_set;
 		bits_to_set = BITS_PER_LONG;
-- 
2.36.1