The patch titled
Subject: mm/cma_debug.c: fix the break condition in cma_maxchunk_get()
has been added to the -mm tree. Its filename is
mm-cma_debugc-fix-the-break-condition-in-cma_maxchunk_get.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-cma_debugc-fix-the-break-condition-in-cma_maxchunk_get.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-cma_debugc-fix-the-break-condition-in-cma_maxchunk_get.patch
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------------------------------------------------------
From: Yue Hu <huyue2@xxxxxxxxxx>
Subject: mm/cma_debug.c: fix the break condition in cma_maxchunk_get()
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@xxxxxxxxx
Signed-off-by: Yue Hu <huyue2@xxxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Joe Perches <joe@xxxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Dmitry Safonov <d.safonov@xxxxxxxxxxxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/cma_debug.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/cma_debug.c~mm-cma_debugc-fix-the-break-condition-in-cma_maxchunk_get
+++ a/mm/cma_debug.c
@@ -56,7 +56,7 @@ static int cma_maxchunk_get(void *data,
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);
_
Patches currently in -mm which might be from huyue2@xxxxxxxxxx are
mm-cma_debugc-fix-the-break-condition-in-cma_maxchunk_get.patch
