Each memblock_region has flags to indicates the Node ID of this range. For the overlap case, memblock_add_range() inserts the lower part and leave the upper part as indicated in the overlapped region. If the flags of the new range differs from the overlapped region, the information recorded is not correct. This patch adds a WARN_ON when the flags of the new range differs from the overlapped region. Signed-off-by: Wei Yang <weiyang@xxxxxxxxxxxxxxxxxx> --- mm/memblock.c | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/memblock.c b/mm/memblock.c index 95ce68c..bde61e8 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -569,6 +569,7 @@ repeat: #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP WARN_ON(nid != memblock_get_region_node(rgn)); #endif + WARN_ON(flags != rgn->flags); nr_new++; if (insert) memblock_insert_region(type, i++, base, -- 1.7.9.5 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>