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linux: bitmap.h: Add find_next_zero_area function

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Add find_next_zero_area to fetch the next zero area in the map.

Signed-off-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Amjad Ouled-Ameur <aouledameur@baylibre.com>
This commit is contained in:
Keerthy 2022-01-27 13:16:54 +01:00 • committed by Tom Rini
parent b071a07743
commit 8a92603a34
1 changed files with 26 additions and 0 deletions
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26
include/linux/bitmap.h
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@ -159,6 +159,32 @@ static inline unsigned long find_first_bit(const unsigned long *addr, unsigned l
(bit) < (size); \ (bit) < (size); \
(bit) = find_next_bit((addr), (size), (bit) + 1)) (bit) = find_next_bit((addr), (size), (bit) + 1))
static inline unsigned long
bitmap_find_next_zero_area(unsigned long *map,
unsigned long size,
unsigned long start,
unsigned int nr, unsigned long align_mask)
{
unsigned long index, end, i;
again:
index = find_next_zero_bit(map, size, start);
/*
* Align allocation
*/
index = (index + align_mask) & ~align_mask;
end = index + nr;
if (end > size)
return end;
i = find_next_bit(map, end, index);
if (i < end) {
start = i + 1;
goto again;
}
return index;
}
static inline void bitmap_fill(unsigned long *dst, unsigned int nbits) static inline void bitmap_fill(unsigned long *dst, unsigned int nbits)
{ {
if (small_const_nbits(nbits)) { if (small_const_nbits(nbits)) {