[PATCH 29/29] csky: Fixup pfn_valid error with wrong max_mapnr

[guoren]

From: Guo Ren <guoren@xxxxxxxxxxxxxxxxx>

The max_mapnr is the number of PFNs, not absolute PFN offset.

Signed-off-by: Guo Ren <guoren@xxxxxxxxxxxxxxxxx>
---
 arch/csky/mm/init.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/csky/mm/init.c b/arch/csky/mm/init.c
index 03970f4408f5..81e4e5e78f38 100644
--- a/arch/csky/mm/init.c
+++ b/arch/csky/mm/init.c
@@ -86,9 +86,9 @@ void __init mem_init(void)
 #ifdef CONFIG_HIGHMEM
 	unsigned long tmp;
 
-	set_max_mapnr(highend_pfn);
+	set_max_mapnr(highend_pfn - ARCH_PFN_OFFSET);
 #else
-	set_max_mapnr(max_low_pfn);
+	set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET);
 #endif
 	high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
 
-- 
2.17.1