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authorYue Hu <huyue2@yulong.com>2019-05-13 17:16:37 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-06-15 11:54:51 +0200
commite7b92a6d4a1e89601fed05d5b69288e84d7e842b (patch)
tree2942a9785a2b0bc565edb782754aef7120f34d13 /mm
parent20fbb34e22daf0a039349e04a2c8c5d327f3b6a3 (diff)
mm/cma_debug.c: fix the break condition in cma_maxchunk_get()
[ Upstream commit f0fd50504a54f5548eb666dc16ddf8394e44e4b7 ] If not find zero bit in find_next_zero_bit(), it will return the size parameter passed in, so the start bit should be compared with bitmap_maxno rather than cma->count. Although getting maxchunk is working fine due to zero value of order_per_bit currently, the operation will be stuck if order_per_bit is set as non-zero. Link: http://lkml.kernel.org/r/20190319092734.276-1-zbestahu@gmail.com Signed-off-by: Yue Hu <huyue2@yulong.com> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Joe Perches <joe@perches.com> Cc: David Rientjes <rientjes@google.com> Cc: Dmitry Safonov <d.safonov@partner.samsung.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/cma_debug.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/cma_debug.c b/mm/cma_debug.c
index 275df8b5b22e..c47ea3cfee79 100644
--- a/mm/cma_debug.c
+++ b/mm/cma_debug.c
@@ -58,7 +58,7 @@ static int cma_maxchunk_get(void *data, u64 *val)
mutex_lock(&cma->lock);
for (;;) {
start = find_next_zero_bit(cma->bitmap, bitmap_maxno, end);
- if (start >= cma->count)
+ if (start >= bitmap_maxno)
break;
end = find_next_bit(cma->bitmap, bitmap_maxno, start);
maxchunk = max(end - start, maxchunk);