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linux: bitmap.h: Add find_next_zero_area function 

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 2021-09-01 15:09:31 +02:00 committed by Praneeth Bajjuri
parent c66fec85c7
commit 622e0bea7e
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) = 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)
{
if (small_const_nbits(nbits)) {