[PATCH 2/2] mm/cma_debug: correct size input to bitmap function

[Joonsoo Kim]

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.

Signed-off-by: Joonsoo Kim <iamjoonsoo....@lge.com>
---
 mm/cma_debug.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/mm/cma_debug.c b/mm/cma_debug.c
index 22190a7..f8e4b60 100644
--- a/mm/cma_debug.c
+++ b/mm/cma_debug.c
@@ -39,7 +39,7 @@ static int cma_used_get(void *data, u64 *val)
 
        mutex_lock(&cma->lock);
        /* pages counter is smaller than sizeof(int) */
-       used = bitmap_weight(cma->bitmap, (int)cma->count);
+       used = bitmap_weight(cma->bitmap, (int)cma_bitmap_maxno(cma));
        mutex_unlock(&cma->lock);
        *val = (u64)used << cma->order_per_bit;
 
@@ -52,13 +52,14 @@ static int cma_maxchunk_get(void *data, u64 *val)
        struct cma *cma = data;
        unsigned long maxchunk = 0;
        unsigned long start, end = 0;
+       unsigned long bitmap_maxno = cma_bitmap_maxno(cma);
 
        mutex_lock(&cma->lock);
        for (;;) {
-               start = find_next_zero_bit(cma->bitmap, cma->count, end);
+               start = find_next_zero_bit(cma->bitmap, bitmap_maxno, end);
                if (start >= cma->count)
                        break;
-               end = find_next_bit(cma->bitmap, cma->count, start);
+               end = find_next_bit(cma->bitmap, bitmap_maxno, start);
                maxchunk = max(end - start, maxchunk);
        }
        mutex_unlock(&cma->lock);
-- 
1.9.1

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