From: Yue Hu <huyue2@xxxxxxxxxx>
Currently one bit in cma bitmap represents number of pages rather than
one page, cma->count means cma size in pages. So to find available pages
via find_next_zero_bit()/find_next_bit() we should use cma size not in
pages but in bits although current free pages number is correct due to
zero value of order_per_bit. Once order_per_bit is changed the bitmap
status will be incorrect.
Signed-off-by: Yue Hu <huyue2@xxxxxxxxxx>
---
mm/cma.c | 19 +++++++++++--------
1 file changed, 11 insertions(+), 8 deletions(-)
diff --git a/mm/cma.c b/mm/cma.c
index 5809bbe..6a7aa05 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -367,23 +367,26 @@ int __init cma_declare_contiguous(phys_addr_t base,
#ifdef CONFIG_CMA_DEBUG
static void cma_debug_show_areas(struct cma *cma)
{
- unsigned long next_zero_bit, next_set_bit;
+ unsigned long next_zero_bit, next_set_bit, nr_zero;
unsigned long start = 0;
- unsigned int nr_zero, nr_total = 0;
+ unsigned long nr_part, nr_total = 0;
+ unsigned long nbits = cma_bitmap_maxno(cma);
mutex_lock(&cma->lock);
pr_info("number of available pages: ");
for (;;) {
- next_zero_bit = find_next_zero_bit(cma->bitmap, cma->count, start);
- if (next_zero_bit >= cma->count)
+ next_zero_bit = find_next_zero_bit(cma->bitmap, nbits, start);
+ if (next_zero_bit >= nbits)
break;
- next_set_bit = find_next_bit(cma->bitmap, cma->count, next_zero_bit);
+ next_set_bit = find_next_bit(cma->bitmap, nbits, next_zero_bit);
nr_zero = next_set_bit - next_zero_bit;
- pr_cont("%s%u@%lu", nr_total ? "+" : "", nr_zero, next_zero_bit);
- nr_total += nr_zero;
+ nr_part = nr_zero << cma->order_per_bit;
+ pr_cont("%s%lu@%lu", nr_total ? "+" : "", nr_part,
+ next_zero_bit);
+ nr_total += nr_part;
start = next_zero_bit + nr_zero;
}
- pr_cont("=> %u free of %lu total pages\n", nr_total, cma->count);
+ pr_cont("=> %lu free of %lu total pages\n", nr_total, cma->count);
mutex_unlock(&cma->lock);
}
#else
--
1.9.1
