Subject: [PATCH v3 21/29] x86: introduce arch_zone_limits_init()

From: Mike Rapoport <[email-masked]>
Date: Sun, 11 Jan 2026 10:20:55 +0200

From: "Mike Rapoport (Microsoft)" <[email-masked]>

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) <[email-masked]>
---
 arch/x86/mm/init.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index 8bf6ad4b9400..e7ef605a18d6 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -997,12 +997,8 @@ void __init free_initrd_mem(unsigned long start, unsigned long end)
 }
 #endif
 
-void __init zone_sizes_init(void)
+void __init arch_zone_limits_init(unsigned long *max_zone_pfns)
 {
-	unsigned long max_zone_pfns[MAX_NR_ZONES];
-
-	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
-
 #ifdef CONFIG_ZONE_DMA
 	max_zone_pfns[ZONE_DMA]		= min(MAX_DMA_PFN, max_low_pfn);
 #endif
@@ -1013,7 +1009,15 @@ void __init zone_sizes_init(void)
 #ifdef CONFIG_HIGHMEM
 	max_zone_pfns[ZONE_HIGHMEM]	= max_pfn;
 #endif
+}
+
+void __init zone_sizes_init(void)
+{
+	unsigned long max_zone_pfns[MAX_NR_ZONES];
+
+	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 
+	arch_zone_limits_init(max_zone_pfns);
 	free_area_init(max_zone_pfns);
 }
 
-- 
2.51.0