fedora core 6 1.2949 + vserver 2.2.0

[linux-2.6.git] / include / linux / bitmap.h

diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h
index cff8043..45e32d2 100644 (file)
--- a/include/linux/bitmap.h
+++ b/include/linux/bitmap.h
@@ -24,6 +24,9 @@
  * The available bitmap operations and their rough meaning in the
  * case that the bitmap is a single unsigned long are thus:
  *
+ * Note that nbits should be always a compile time evaluable constant.
+ * Otherwise many inlines will generate horrible code.
+ *
  * bitmap_zero(dst, nbits)                     *dst = 0UL
  * bitmap_fill(dst, nbits)                     *dst = ~0UL
  * bitmap_copy(dst, src, nbits)                        *dst = *src
@@ -43,7 +46,8 @@
  * bitmap_remap(dst, src, old, new, nbits)     *dst = map(old, new)(src)
  * bitmap_bitremap(oldbit, old, new, nbits)    newbit = map(old, new)(oldbit)
  * bitmap_scnprintf(buf, len, src, nbits)      Print bitmap src to buf
- * bitmap_parse(ubuf, ulen, dst, nbits)                Parse bitmap dst from user buf
+ * bitmap_parse(buf, buflen, dst, nbits)       Parse bitmap dst from kernel buf
+ * bitmap_parse_user(ubuf, ulen, dst, nbits)   Parse bitmap dst from user buf
  * bitmap_scnlistprintf(buf, len, src, nbits)  Print bitmap src as list to buf
  * bitmap_parselist(buf, dst, nbits)           Parse bitmap dst from list
  * bitmap_find_free_region(bitmap, bits, order)        Find and allocate bit region
@@ -103,7 +107,9 @@ extern int __bitmap_weight(const unsigned long *bitmap, int bits);
 
 extern int bitmap_scnprintf(char *buf, unsigned int len,
                        const unsigned long *src, int nbits);
-extern int bitmap_parse(const char __user *ubuf, unsigned int ulen,
+extern int __bitmap_parse(const char *buf, unsigned int buflen, int is_user,
+                       unsigned long *dst, int nbits);
+extern int bitmap_parse_user(const char __user *ubuf, unsigned int ulen,
                        unsigned long *dst, int nbits);
 extern int bitmap_scnlistprintf(char *buf, unsigned int len,
                        const unsigned long *src, int nbits);
@@ -244,6 +250,8 @@ static inline int __must_check bitmap_full(const unsigned long *src, int nbits)
 
 static inline int __must_check bitmap_weight(const unsigned long *src, int nbits)
 {
+       if (nbits <= BITS_PER_LONG)
+               return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits));
        return __bitmap_weight(src, nbits);
 }
 
@@ -265,6 +273,12 @@ static inline void bitmap_shift_left(unsigned long *dst,
                __bitmap_shift_left(dst, src, n, nbits);
 }
 
+static inline int bitmap_parse(const char *buf, unsigned int buflen,
+                       unsigned long *maskp, int nmaskbits)
+{
+       return __bitmap_parse(buf, buflen, 0, maskp, nmaskbits);
+}
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* __LINUX_BITMAP_H */