From d56e84b4064d65285161d6bfa04382e1cdd4e49c Mon Sep 17 00:00:00 2001 From: Joonsoo Kim Date: Fri, 17 Jul 2015 16:24:23 -0700 Subject: [PATCH] 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 Acked-by: Michal Nazarewicz Cc: Sasha Levin Cc: Stefan Strogin Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- 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 22190a7fd58e..f8e4b60db167 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); -- 2.20.1