mm/cma_debug: correct size input to bitmap function

In CMA, 1 bit in bitmap means 1 << order_per_bits pages so size of bitmap is cma->count >> order_per_bits rather than just cma->count. This patch fixes it.

Joonsoo Kim committed 11 years ago

Commit d56e84b1 parent 2292c0b1 file · +4 −3Browse files

Unified · Split

mm/cma_debug.c+4−3

@@ -39,7 +39,7 @@ static int cma_used_get(void data, u64 val) · 38 unmodified lines
39	39
40	40	mutex_lock(&cma->lock);
41	41	/* pages counter is smaller than sizeof(int) */
42		− used = bitmap_weight(cma->bitmap, (int)cma->count);
	42	+ used = bitmap_weight(cma->bitmap, (int)cma_bitmap_maxno(cma));
43	43	mutex_unlock(&cma->lock);
44	44	*val = (u64)used << cma->order_per_bit;
45	45
@@ -52,13 +52,14 @@ static int cma_maxchunk_get(void data, u64 val) · 6 unmodified lines
52	52	struct cma *cma = data;
53	53	unsigned long maxchunk = 0;
54	54	unsigned long start, end = 0;
	55	+ unsigned long bitmap_maxno = cma_bitmap_maxno(cma);
55	56
56	57	mutex_lock(&cma->lock);
57	58	for (;;) {
58		− start = find_next_zero_bit(cma->bitmap, cma->count, end);
	59	+ start = find_next_zero_bit(cma->bitmap, bitmap_maxno, end);
59	60	if (start >= cma->count)
60	61	break;
61		− end = find_next_bit(cma->bitmap, cma->count, start);
	62	+ end = find_next_bit(cma->bitmap, bitmap_maxno, start);
62	63	maxchunk = max(end - start, maxchunk);
63	64	}
64	65	mutex_unlock(&cma->lock);