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-rw-r--r--include/linux/bitmap.h5
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
245static inline int bitmap_weight(const unsigned long *src, int nbits) 248static 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