New helper: deactivate_locked_super()

[safe/jmp/linux-2.6] / include / linux / bitmap.h

diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h
index acad110..2878811 100644 (file)
--- a/include/linux/bitmap.h
+++ b/include/linux/bitmap.h
@@ -46,6 +46,8 @@
  * bitmap_shift_left(dst, src, n, nbits)       *dst = *src << n
  * bitmap_remap(dst, src, old, new, nbits)     *dst = map(old, new)(src)
  * bitmap_bitremap(oldbit, old, new, nbits)    newbit = map(old, new)(oldbit)
+ * bitmap_onto(dst, orig, relmap, nbits)       *dst = orig relative to relmap
+ * bitmap_fold(dst, orig, sz, nbits)           dst bits = orig bits mod sz
  * bitmap_scnprintf(buf, len, src, nbits)      Print bitmap src to 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
@@ -120,9 +122,14 @@ extern void bitmap_remap(unsigned long *dst, const unsigned long *src,
                const unsigned long *old, const unsigned long *new, int bits);
 extern int bitmap_bitremap(int oldbit,
                const unsigned long *old, const unsigned long *new, int bits);
+extern void bitmap_onto(unsigned long *dst, const unsigned long *orig,
+               const unsigned long *relmap, int bits);
+extern void bitmap_fold(unsigned long *dst, const unsigned long *orig,
+               int sz, int bits);
 extern int bitmap_find_free_region(unsigned long *bitmap, int bits, int order);
 extern void bitmap_release_region(unsigned long *bitmap, int pos, int order);
 extern int bitmap_allocate_region(unsigned long *bitmap, int pos, int order);
+extern void bitmap_copy_le(void *dst, const unsigned long *src, int nbits);
 
 #define BITMAP_LAST_WORD_MASK(nbits)                                   \
 (                                                                      \
@@ -130,9 +137,12 @@ extern int bitmap_allocate_region(unsigned long *bitmap, int pos, int order);
                (1UL<<((nbits) % BITS_PER_LONG))-1 : ~0UL               \
 )
 
+#define small_const_nbits(nbits) \
+       (__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG)
+
 static inline void bitmap_zero(unsigned long *dst, int nbits)
 {
-       if (nbits <= BITS_PER_LONG)
+       if (small_const_nbits(nbits))
                *dst = 0UL;
        else {
                int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
@@ -143,7 +153,7 @@ static inline void bitmap_zero(unsigned long *dst, int nbits)
 static inline void bitmap_fill(unsigned long *dst, int nbits)
 {
        size_t nlongs = BITS_TO_LONGS(nbits);
-       if (nlongs > 1) {
+       if (!small_const_nbits(nbits)) {
                int len = (nlongs - 1) * sizeof(unsigned long);
                memset(dst, 0xff,  len);
        }
@@ -153,7 +163,7 @@ static inline void bitmap_fill(unsigned long *dst, int nbits)
 static inline void bitmap_copy(unsigned long *dst, const unsigned long *src,
                        int nbits)
 {
-       if (nbits <= BITS_PER_LONG)
+       if (small_const_nbits(nbits))
                *dst = *src;
        else {
                int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
@@ -164,7 +174,7 @@ static inline void bitmap_copy(unsigned long *dst, const unsigned long *src,
 static inline void bitmap_and(unsigned long *dst, const unsigned long *src1,
                        const unsigned long *src2, int nbits)
 {
-       if (nbits <= BITS_PER_LONG)
+       if (small_const_nbits(nbits))
                *dst = *src1 & *src2;
        else
                __bitmap_and(dst, src1, src2, nbits);
@@ -173,7 +183,7 @@ static inline void bitmap_and(unsigned long *dst, const unsigned long *src1,
 static inline void bitmap_or(unsigned long *dst, const unsigned long *src1,
                        const unsigned long *src2, int nbits)
 {
-       if (nbits <= BITS_PER_LONG)
+       if (small_const_nbits(nbits))
                *dst = *src1 | *src2;
        else
                __bitmap_or(dst, src1, src2, nbits);
@@ -182,7 +192,7 @@ static inline void bitmap_or(unsigned long *dst, const unsigned long *src1,
 static inline void bitmap_xor(unsigned long *dst, const unsigned long *src1,
                        const unsigned long *src2, int nbits)
 {
-       if (nbits <= BITS_PER_LONG)
+       if (small_const_nbits(nbits))
                *dst = *src1 ^ *src2;
        else
                __bitmap_xor(dst, src1, src2, nbits);
@@ -191,7 +201,7 @@ static inline void bitmap_xor(unsigned long *dst, const unsigned long *src1,
 static inline void bitmap_andnot(unsigned long *dst, const unsigned long *src1,
                        const unsigned long *src2, int nbits)
 {
-       if (nbits <= BITS_PER_LONG)
+       if (small_const_nbits(nbits))
                *dst = *src1 & ~(*src2);
        else
                __bitmap_andnot(dst, src1, src2, nbits);
@@ -200,7 +210,7 @@ static inline void bitmap_andnot(unsigned long *dst, const unsigned long *src1,
 static inline void bitmap_complement(unsigned long *dst, const unsigned long *src,
                        int nbits)
 {
-       if (nbits <= BITS_PER_LONG)
+       if (small_const_nbits(nbits))
                *dst = ~(*src) & BITMAP_LAST_WORD_MASK(nbits);
        else
                __bitmap_complement(dst, src, nbits);
@@ -209,7 +219,7 @@ static inline void bitmap_complement(unsigned long *dst, const unsigned long *sr
 static inline int bitmap_equal(const unsigned long *src1,
                        const unsigned long *src2, int nbits)
 {
-       if (nbits <= BITS_PER_LONG)
+       if (small_const_nbits(nbits))
                return ! ((*src1 ^ *src2) & BITMAP_LAST_WORD_MASK(nbits));
        else
                return __bitmap_equal(src1, src2, nbits);
@@ -218,7 +228,7 @@ static inline int bitmap_equal(const unsigned long *src1,
 static inline int bitmap_intersects(const unsigned long *src1,
                        const unsigned long *src2, int nbits)
 {
-       if (nbits <= BITS_PER_LONG)
+       if (small_const_nbits(nbits))
                return ((*src1 & *src2) & BITMAP_LAST_WORD_MASK(nbits)) != 0;
        else
                return __bitmap_intersects(src1, src2, nbits);
@@ -227,7 +237,7 @@ static inline int bitmap_intersects(const unsigned long *src1,
 static inline int bitmap_subset(const unsigned long *src1,
                        const unsigned long *src2, int nbits)
 {
-       if (nbits <= BITS_PER_LONG)
+       if (small_const_nbits(nbits))
                return ! ((*src1 & ~(*src2)) & BITMAP_LAST_WORD_MASK(nbits));
        else
                return __bitmap_subset(src1, src2, nbits);
@@ -235,7 +245,7 @@ static inline int bitmap_subset(const unsigned long *src1,
 
 static inline int bitmap_empty(const unsigned long *src, int nbits)
 {
-       if (nbits <= BITS_PER_LONG)
+       if (small_const_nbits(nbits))
                return ! (*src & BITMAP_LAST_WORD_MASK(nbits));
        else
                return __bitmap_empty(src, nbits);
@@ -243,7 +253,7 @@ static inline int bitmap_empty(const unsigned long *src, int nbits)
 
 static inline int bitmap_full(const unsigned long *src, int nbits)
 {
-       if (nbits <= BITS_PER_LONG)
+       if (small_const_nbits(nbits))
                return ! (~(*src) & BITMAP_LAST_WORD_MASK(nbits));
        else
                return __bitmap_full(src, nbits);
@@ -251,7 +261,7 @@ static inline int bitmap_full(const unsigned long *src, int nbits)
 
 static inline int bitmap_weight(const unsigned long *src, int nbits)
 {
-       if (nbits <= BITS_PER_LONG)
+       if (small_const_nbits(nbits))
                return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits));
        return __bitmap_weight(src, nbits);
 }
@@ -259,7 +269,7 @@ static inline int bitmap_weight(const unsigned long *src, int nbits)
 static inline void bitmap_shift_right(unsigned long *dst,
                        const unsigned long *src, int n, int nbits)
 {
-       if (nbits <= BITS_PER_LONG)
+       if (small_const_nbits(nbits))
                *dst = *src >> n;
        else
                __bitmap_shift_right(dst, src, n, nbits);
@@ -268,7 +278,7 @@ static inline void bitmap_shift_right(unsigned long *dst,
 static inline void bitmap_shift_left(unsigned long *dst,
                        const unsigned long *src, int n, int nbits)
 {
-       if (nbits <= BITS_PER_LONG)
+       if (small_const_nbits(nbits))
                *dst = (*src << n) & BITMAP_LAST_WORD_MASK(nbits);
        else
                __bitmap_shift_left(dst, src, n, nbits);