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.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: Stefan Strogin <stefan.strogin@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/cma_debug.c b/mm/cma_debug.c
index 22190a7fd58ee08dd35643f7d652a71259e1cb24..f8e4b60db167215862824637d856ffb34332f071 100644 (file)
--- 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);