linux-kernel - [PATCH 10/28] mips: introduce arch_zone_limits

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Message-ID: <20251228124001.3624742-11-rppt@kernel.org>
Date: Sun, 28 Dec 2025 14:39:40 +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 10/28] mips: 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/mips/loongson64/numa.c      |  9 +++++++--
 arch/mips/mm/init.c              | 14 +++++++++-----
 arch/mips/sgi-ip27/ip27-memory.c |  7 ++++++-
 3 files changed, 22 insertions(+), 8 deletions(-)

diff --git a/arch/mips/loongson64/numa.c b/arch/mips/loongson64/numa.c
index 95d5f553ce19..f72a58f87878 100644
--- a/arch/mips/loongson64/numa.c
+++ b/arch/mips/loongson64/numa.c
@@ -154,13 +154,18 @@ static __init void prom_meminit(void)
 	}
 }
 
+void __init arch_zone_limits_init(unsigned long *max_zone_pfns)
+{
+	max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
+	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
+}
+
 void __init paging_init(void)
 {
 	unsigned long zones_size[MAX_NR_ZONES] = {0, };
 
 	pagetable_init();
-	zones_size[ZONE_DMA32] = MAX_DMA32_PFN;
-	zones_size[ZONE_NORMAL] = max_low_pfn;
+	arch_zone_limits_init(zones_size);
 	free_area_init(zones_size);
 }
 
diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c
index a673d3d68254..ab08249cfede 100644
--- a/arch/mips/mm/init.c
+++ b/arch/mips/mm/init.c
@@ -394,12 +394,8 @@ void maar_init(void)
 }
 
 #ifndef CONFIG_NUMA
-void __init paging_init(void)
+void __init arch_zone_limits_init(unsigned long *max_zone_pfns)
 {
-	unsigned long max_zone_pfns[MAX_NR_ZONES];
-
-	pagetable_init();
-
 #ifdef CONFIG_ZONE_DMA
 	max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
 #endif
@@ -417,7 +413,15 @@ void __init paging_init(void)
 		max_zone_pfns[ZONE_HIGHMEM] = max_low_pfn;
 	}
 #endif
+}
+
+void __init paging_init(void)
+{
+	unsigned long max_zone_pfns[MAX_NR_ZONES];
+
+	pagetable_init();
 
+	arch_zone_limits_init(max_zone_pfns);
 	free_area_init(max_zone_pfns);
 }
 
diff --git a/arch/mips/sgi-ip27/ip27-memory.c b/arch/mips/sgi-ip27/ip27-memory.c
index 2b3e46e2e607..babeb0e07687 100644
--- a/arch/mips/sgi-ip27/ip27-memory.c
+++ b/arch/mips/sgi-ip27/ip27-memory.c
@@ -406,11 +406,16 @@ void __init prom_meminit(void)
 	}
 }
 
+void __init arch_zone_limits_init(unsigned long *max_zone_pfns)
+{
+	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
+}
+
 void __init paging_init(void)
 {
 	unsigned long zones_size[MAX_NR_ZONES] = {0, };
 
 	pagetable_init();
-	zones_size[ZONE_NORMAL] = max_low_pfn;
+	arch_zone_limits_init(zones_size);
 	free_area_init(zones_size);
 }
-- 
2.51.0