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| author | Yue Hu <huyue2@yulong.com> | 2019-05-13 17:16:37 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-06-22 08:18:18 +0200 |
| commit | 937fa1624a1fa5de5236dbdcbd8307731eeca125 (patch) | |
| tree | 3354dbebcbd7e5dcccd493692b993297f4286488 | |
| parent | fceb0be41836c1045a28027819374b6b49467743 (diff) | |
| download | linux-stable-937fa1624a1fa5de5236dbdcbd8307731eeca125.tar.gz linux-stable-937fa1624a1fa5de5236dbdcbd8307731eeca125.tar.bz2 linux-stable-937fa1624a1fa5de5236dbdcbd8307731eeca125.zip | |
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>
| -rw-r--r-- | mm/cma_debug.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/cma_debug.c b/mm/cma_debug.c index f8e4b60db167..da50dab56b70 100644 --- a/mm/cma_debug.c +++ b/mm/cma_debug.c @@ -57,7 +57,7 @@ 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); |