linux-kernel - [PATCH 01/28] alpha: introduce arch_zone_limits

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Message-ID: <20251228124001.3624742-2-rppt@kernel.org>
Date: Sun, 28 Dec 2025 14:39:31 +0200
From: Mike Rapoport <rppt@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>
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Subject: [PATCH 01/28] alpha: introduce arch_zone_limits_init()

From: "Mike Rapoport (Microsoft)" <rppt@...nel.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@...nel.org>
---
 arch/alpha/mm/init.c | 15 ++++++++++-----
 include/linux/mm.h   |  1 +
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/arch/alpha/mm/init.c b/arch/alpha/mm/init.c
index 4c5ab9cd8a0a..cd0cb1abde5f 100644
--- a/arch/alpha/mm/init.c
+++ b/arch/alpha/mm/init.c
@@ -208,12 +208,8 @@ callback_init(void * kernel_end)
 	return kernel_end;
 }
 
-/*
- * paging_init() sets up the memory map.
- */
-void __init paging_init(void)
+void __init arch_zone_limits_init(unsigned long *max_zone_pfn)
 {
-	unsigned long max_zone_pfn[MAX_NR_ZONES] = {0, };
 	unsigned long dma_pfn;
 
 	dma_pfn = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
@@ -221,8 +217,17 @@ void __init paging_init(void)
 
 	max_zone_pfn[ZONE_DMA] = dma_pfn;
 	max_zone_pfn[ZONE_NORMAL] = max_pfn;
+}
+
+/*
+ * paging_init() sets up the memory map.
+ */
+void __init paging_init(void)
+{
+	unsigned long max_zone_pfn[MAX_NR_ZONES] = {0, };
 
 	/* Initialize mem_map[].  */
+	arch_zone_limits_init(max_zone_pfn);
 	free_area_init(max_zone_pfn);
 
 	/* Initialize the kernel's ZERO_PGE. */
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 15076261d0c2..628c0e0ac313 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -3552,6 +3552,7 @@ static inline unsigned long get_num_physpages(void)
  * free_area_init(max_zone_pfns);
  */
 void free_area_init(unsigned long *max_zone_pfn);
+void arch_zone_limits_init(unsigned long *max_zone_pfn);
 unsigned long node_map_pfn_alignment(void);
 extern unsigned long absent_pages_in_range(unsigned long start_pfn,
 						unsigned long end_pfn);
-- 
2.51.0