From: "Mike Rapoport (IBM)" <rppt@xxxxxxxxxx>
sh never initializes max_mapnr which is used by the generic
implementation of pfn_valid().
Initialize max_mapnr with set_max_mapnr() in sh::paging_init().
Reported-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Fixes: e5080a967785 ("mm, arch: add generic implementation of pfn_valid() for FLATMEM")
Signed-off-by: Mike Rapoport (IBM) <rppt@xxxxxxxxxx>
---
arch/sh/mm/init.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index 506784702430..bf1b54055316 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -301,6 +301,7 @@ void __init paging_init(void)
*/
max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
+ set_max_mapnr(max_low_pfn - min_low_pfn);
nodes_clear(node_online_map);
--
2.35.1
