[Qemu-devel] [PATCH] bitmap: get last word mask from nr directly

[Wei Yang <richardw.yang@linux.intel.com>]

The value left in nr is the number of bits for the last word, which
could be calculate the last word mask directly.

Remove the unnecessary size.

Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
---
 util/bitmap.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/util/bitmap.c b/util/bitmap.c
index cb618c65a5..5aa60b8717 100644
--- a/util/bitmap.c
+++ b/util/bitmap.c
@@ -160,7 +160,6 @@ int slow_bitmap_andnot(unsigned long *dst, const unsigned long *bitmap1,
 void bitmap_set(unsigned long *map, long start, long nr)
 {
     unsigned long *p = map + BIT_WORD(start);
-    const long size = start + nr;
     int bits_to_set = BITS_PER_LONG - (start % BITS_PER_LONG);
     unsigned long mask_to_set = BITMAP_FIRST_WORD_MASK(start);
 
@@ -174,7 +173,7 @@ void bitmap_set(unsigned long *map, long start, long nr)
         p++;
     }
     if (nr) {
-        mask_to_set &= BITMAP_LAST_WORD_MASK(size);
+        mask_to_set &= BITMAP_LAST_WORD_MASK(nr);
         *p |= mask_to_set;
     }
 }
@@ -221,7 +220,6 @@ void bitmap_set_atomic(unsigned long *map, long start, long nr)
 void bitmap_clear(unsigned long *map, long start, long nr)
 {
     unsigned long *p = map + BIT_WORD(start);
-    const long size = start + nr;
     int bits_to_clear = BITS_PER_LONG - (start % BITS_PER_LONG);
     unsigned long mask_to_clear = BITMAP_FIRST_WORD_MASK(start);
 
@@ -235,7 +233,7 @@ void bitmap_clear(unsigned long *map, long start, long nr)
         p++;
     }
     if (nr) {
-        mask_to_clear &= BITMAP_LAST_WORD_MASK(size);
+        mask_to_clear &= BITMAP_LAST_WORD_MASK(nr);
         *p &= ~mask_to_clear;
     }
 }
-- 
2.19.1