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lib/bitmap: remove bitmap_ord_to_pos 

Now that we have find_nth_bit(), we can drop bitmap_ord_to_pos().

Signed-off-by: Yury Norov <yury.norov@gmail.com>
This commit is contained in:
Yury Norov 2022-09-17 20:07:15 -07:00
parent e3783c805d
commit 97848c10f9
3 changed files with 4 additions and 36 deletions
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1
include/linux/bitmap.h
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@ -225,7 +225,6 @@ void bitmap_copy_le(unsigned long *dst, const unsigned long *src, unsigned int n
#else
#define bitmap_copy_le bitmap_copy
#endif
unsigned int bitmap_ord_to_pos(const unsigned long *bitmap, unsigned int ord, unsigned int nbits);
int bitmap_print_to_pagebuf(bool list, char *buf,
const unsigned long *maskp, int nmaskbits);

3
include/linux/nodemask.h
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@ -508,8 +508,7 @@ static inline int node_random(const nodemask_t *maskp)
w = nodes_weight(*maskp);
if (w)
bit = bitmap_ord_to_pos(maskp->bits,
get_random_int() % w, MAX_NUMNODES);
bit = find_nth_bit(maskp->bits, MAX_NUMNODES, get_random_int() % w);
return bit;
#else
return 0;

36
lib/bitmap.c
View File

@ -968,36 +968,6 @@ static int bitmap_pos_to_ord(const unsigned long *buf, unsigned int pos, unsigne
return bitmap_weight(buf, pos);
}
/**
* bitmap_ord_to_pos - find position of n-th set bit in bitmap
* @buf: pointer to bitmap
* @ord: ordinal bit position (n-th set bit, n >= 0)
* @nbits: number of valid bit positions in @buf
*
* Map the ordinal offset of bit @ord in @buf to its position in @buf.
* Value of @ord should be in range 0 <= @ord < weight(buf). If @ord
* >= weight(buf), returns @nbits.
*
* If for example, just bits 4 through 7 are set in @buf, then @ord
* values 0 through 3 will get mapped to 4 through 7, respectively,
* and all other @ord values returns @nbits. When @ord value 3
* gets mapped to (returns) @pos value 7 in this example, that means
* that the 3rd set bit (starting with 0th) is at position 7 in @buf.
*
* The bit positions 0 through @nbits-1 are valid positions in @buf.
*/
unsigned int bitmap_ord_to_pos(const unsigned long *buf, unsigned int ord, unsigned int nbits)
{
unsigned int pos;
for (pos = find_first_bit(buf, nbits);
pos < nbits && ord;
pos = find_next_bit(buf, nbits, pos + 1))
ord--;
return pos;
}
/**
* bitmap_remap - Apply map defined by a pair of bitmaps to another bitmap
* @dst: remapped result
@ -1047,7 +1017,7 @@ void bitmap_remap(unsigned long *dst, const unsigned long *src,
if (n < 0 || w == 0)
set_bit(oldbit, dst); /* identity map */
else
set_bit(bitmap_ord_to_pos(new, n % w, nbits), dst);
set_bit(find_nth_bit(new, nbits, n % w), dst);
}
}
EXPORT_SYMBOL(bitmap_remap);
@ -1086,7 +1056,7 @@ int bitmap_bitremap(int oldbit, const unsigned long *old,
if (n < 0 || w == 0)
return oldbit;
else
return bitmap_ord_to_pos(new, n % w, bits);
return find_nth_bit(new, bits, n % w);
}
EXPORT_SYMBOL(bitmap_bitremap);
@ -1210,7 +1180,7 @@ void bitmap_onto(unsigned long *dst, const unsigned long *orig,
* The following code is a more efficient, but less
* obvious, equivalent to the loop:
* for (m = 0; m < bitmap_weight(relmap, bits); m++) {
* n = bitmap_ord_to_pos(orig, m, bits);
* n = find_nth_bit(orig, bits, m);
* if (test_bit(m, orig))
* set_bit(n, dst);
* }