[PATCH v2 21/28] xtensa: introduce arch_zone_limits_init()

[Mike Rapoport]

From: "Mike Rapoport (Microsoft)" <rppt at kernel.org>

Move calculations of zone limits to a dedicated arch_zone_limits_init()
function.

Later MM core will use this function as an architecture specific callback
during nodes and zones initialization and thus there won't be a need to
call free_area_init() from every architecture.

Signed-off-by: Mike Rapoport (Microsoft) <rppt at kernel.org>
---
 arch/xtensa/mm/init.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/arch/xtensa/mm/init.c b/arch/xtensa/mm/init.c
index cc52733a0649..60299f359a3c 100644
--- a/arch/xtensa/mm/init.c
+++ b/arch/xtensa/mm/init.c
@@ -116,15 +116,19 @@ static void __init print_vm_layout(void)
 		(unsigned long)(__bss_stop - __bss_start) >> 10);
 }
 
-void __init zones_init(void)
+void __init arch_zone_limits_init(unsigned long *max_zone_pfns)
 {
-	/* All pages are DMA-able, so we put them all in the DMA zone. */
-	unsigned long max_zone_pfn[MAX_NR_ZONES] = {
-		[ZONE_NORMAL] = max_low_pfn,
+	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
 #ifdef CONFIG_HIGHMEM
-		[ZONE_HIGHMEM] = max_pfn,
+	max_zone_pfns[ZONE_HIGHMEM] = max_pfn;
 #endif
-	};
+}
+
+void __init zones_init(void)
+{
+	unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0, };
+
+	arch_zone_limits_init(max_zone_pfn);
 	free_area_init(max_zone_pfn);
 	print_vm_layout();
 }
-- 
2.51.0