linux-kernel - [PATCH 18/28] sparc: introduce arch_zone_limits

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Message-ID: <20251228124001.3624742-19-rppt@kernel.org>
Date: Sun, 28 Dec 2025 14:39:48 +0200
From: Mike Rapoport <rppt@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Alex Shi <alexs@...nel.org>,
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Subject: [PATCH 18/28] sparc: 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/sparc/mm/init_64.c |  6 ++++++
 arch/sparc/mm/srmmu.c   | 12 ++++++++----
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
index df9f7c444c39..fbaad449dfc9 100644
--- a/arch/sparc/mm/init_64.c
+++ b/arch/sparc/mm/init_64.c
@@ -2279,6 +2279,11 @@ static void __init reduce_memory(phys_addr_t limit_ram)
 	memblock_enforce_memory_limit(limit_ram);
 }
 
+void __init arch_zone_limits_init(unsigned long *max_zone_pfns)
+{
+	max_zone_pfns[ZONE_NORMAL] = last_valid_pfn;
+}
+
 void __init paging_init(void)
 {
 	unsigned long end_pfn, shift, phys_base;
@@ -2461,6 +2466,7 @@ void __init paging_init(void)
 
 		max_zone_pfns[ZONE_NORMAL] = end_pfn;
 
+		arch_zone_limits_init(max_zone_pfns);
 		free_area_init(max_zone_pfns);
 	}
 
diff --git a/arch/sparc/mm/srmmu.c b/arch/sparc/mm/srmmu.c
index f8fb4911d360..81e90151db90 100644
--- a/arch/sparc/mm/srmmu.c
+++ b/arch/sparc/mm/srmmu.c
@@ -884,6 +884,13 @@ static void __init map_kernel(void)
 
 void (*poke_srmmu)(void) = NULL;
 
+void __init arch_zone_limits_init(unsigned long *max_zone_pfns)
+{
+	max_zone_pfns[ZONE_DMA] = max_low_pfn;
+	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
+	max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
+}
+
 void __init srmmu_paging_init(void)
 {
 	int i;
@@ -967,10 +974,7 @@ void __init srmmu_paging_init(void)
 	{
 		unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 };
 
-		max_zone_pfn[ZONE_DMA] = max_low_pfn;
-		max_zone_pfn[ZONE_NORMAL] = max_low_pfn;
-		max_zone_pfn[ZONE_HIGHMEM] = highend_pfn;
-
+		arch_zone_limits_init(max_zone_pfn);
 		free_area_init(max_zone_pfn);
 	}
 }
-- 
2.51.0