When SPARSEMEM is used, there is an indication that pageblock is not
allowed to exceed one mem_section. Current code doesn't have this
constrain explicitly.
This patch adds this to make sure it won't.
Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
---
include/linux/mmzone.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index be126113b499..8f3ce3a0c7d6 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -1084,6 +1084,10 @@ static inline unsigned long early_pfn_to_nid(unsigned long pfn)
#error Allocator MAX_ORDER exceeds SECTION_SIZE
#endif
+#if (pageblock_order + PAGE_SHIFT) > SECTION_SIZE_BITS
+#error Allocator pageblock_order exceeds SECTION_SIZE
+#endif
+
static inline unsigned long pfn_to_section_nr(unsigned long pfn)
{
return pfn >> PFN_SECTION_SHIFT;
--
2.15.1
