Function __section_nr() was implemented to retrieve the corresponding memory section number according to its descriptor. It's possible that the specified memory section descriptor isn't existing in the global array. So here to add more check on that and report error for wrong case. Signed-off-by: Gavin Shan <shangw@xxxxxxxxxxxxxxxxxx> --- mm/sparse.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/sparse.c b/mm/sparse.c index a6984d9..f2525fd 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -147,6 +147,8 @@ int __section_nr(struct mem_section* ms) break; } + VM_BUG_ON(root_nr == NR_SECTION_ROOTS); + return (root_nr * SECTIONS_PER_ROOT) + (ms - root); } -- 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>