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[Qemu-devel] [PATCH 2/2] bitmap: fix bitmap_count_one
From: |
Wei Wang |
Subject: |
[Qemu-devel] [PATCH 2/2] bitmap: fix bitmap_count_one |
Date: |
Mon, 30 Jul 2018 15:13:57 +0800 |
Since "nbits = 0" is not applicable to the BITMAP_LAST_WORD_MASK macro,
callers need to avoid passing "nbits = 0" to this macro, which generates
incorrect results.
Signed-off-by: Wei Wang <address@hidden>
CC: Dr. David Alan Gilbert <address@hidden>
CC: Juan Quintela <address@hidden>
CC: Peter Xu <address@hidden>
---
include/qemu/bitmap.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/qemu/bitmap.h b/include/qemu/bitmap.h
index f53c640..e45e9c0 100644
--- a/include/qemu/bitmap.h
+++ b/include/qemu/bitmap.h
@@ -223,7 +223,7 @@ static inline int bitmap_intersects(const unsigned long
*src1,
static inline long bitmap_count_one(const unsigned long *bitmap, long nbits)
{
if (small_nbits(nbits)) {
- return ctpopl(*bitmap & BITMAP_LAST_WORD_MASK(nbits));
+ return nbits ? ctpopl(*bitmap & BITMAP_LAST_WORD_MASK(nbits)) : 0;
} else {
return slow_bitmap_count_one(bitmap, nbits);
}
--
2.7.4