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Subject[PATCH] mm/sparse: Check the return value of first_present_section_nr()
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first_present_section_nr() may return -1,
which means there is no present section in system,or other errors,
so we cause panic here.

Signed-off-by: Liam Ni <zhiguangni01@gmail.com>
---
mm/sparse.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/mm/sparse.c b/mm/sparse.c
index b8d5d58fe240..175727e10deb 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -564,6 +564,8 @@ void __init sparse_init(void)
memblocks_present();

pnum_begin = first_present_section_nr();
+ if (pnum_begin == -1)
+ panic("There is no present section in system\n");
nid_begin = sparse_early_nid(__nr_to_section(pnum_begin));

/* Setup pageblock_order for HUGETLB_PAGE_SIZE_VARIABLE */
--
2.25.1
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