diff options
Diffstat (limited to 'include/linux/bitmap.h')
-rw-r--r-- | include/linux/bitmap.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h index d9ed27969855..dcc5de7cc487 100644 --- a/include/linux/bitmap.h +++ b/include/linux/bitmap.h | |||
@@ -24,6 +24,9 @@ | |||
24 | * The available bitmap operations and their rough meaning in the | 24 | * The available bitmap operations and their rough meaning in the |
25 | * case that the bitmap is a single unsigned long are thus: | 25 | * case that the bitmap is a single unsigned long are thus: |
26 | * | 26 | * |
27 | * Note that nbits should be always a compile time evaluable constant. | ||
28 | * Otherwise many inlines will generate horrible code. | ||
29 | * | ||
27 | * bitmap_zero(dst, nbits) *dst = 0UL | 30 | * bitmap_zero(dst, nbits) *dst = 0UL |
28 | * bitmap_fill(dst, nbits) *dst = ~0UL | 31 | * bitmap_fill(dst, nbits) *dst = ~0UL |
29 | * bitmap_copy(dst, src, nbits) *dst = *src | 32 | * bitmap_copy(dst, src, nbits) *dst = *src |
@@ -244,6 +247,8 @@ static inline int bitmap_full(const unsigned long *src, int nbits) | |||
244 | 247 | ||
245 | static inline int bitmap_weight(const unsigned long *src, int nbits) | 248 | static inline int bitmap_weight(const unsigned long *src, int nbits) |
246 | { | 249 | { |
250 | if (nbits <= BITS_PER_LONG) | ||
251 | return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits)); | ||
247 | return __bitmap_weight(src, nbits); | 252 | return __bitmap_weight(src, nbits); |
248 | } | 253 | } |
249 | 254 | ||