linux-kernel - [PATCH 05/28] csky: introduce arch_zone_limits

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Message-ID: <20251228124001.3624742-6-rppt@kernel.org>
Date: Sun, 28 Dec 2025 14:39:35 +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 05/28] csky: 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/csky/kernel/setup.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/arch/csky/kernel/setup.c b/arch/csky/kernel/setup.c
index e0d6ca86ea8c..8968815d93e6 100644
--- a/arch/csky/kernel/setup.c
+++ b/arch/csky/kernel/setup.c
@@ -51,6 +51,14 @@ static void __init setup_initrd(void)
 }
 #endif
 
+void __init arch_zone_limits_init(unsigned long *max_zone_pfns)
+{
+	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
+#ifdef CONFIG_HIGHMEM
+	max_zone_pfns[ZONE_HIGHMEM] = max_pfn;
+#endif
+}
+
 static void __init csky_memblock_init(void)
 {
 	unsigned long lowmem_size = PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET);
@@ -83,12 +91,9 @@ static void __init csky_memblock_init(void)
 	setup_initrd();
 #endif
 
-	max_zone_pfn[ZONE_NORMAL] = max_low_pfn;
-
 	mmu_init(min_low_pfn, max_low_pfn);
 
 #ifdef CONFIG_HIGHMEM
-	max_zone_pfn[ZONE_HIGHMEM] = max_pfn;
 
 	highstart_pfn = max_low_pfn;
 	highend_pfn   = max_pfn;
@@ -97,6 +102,7 @@ static void __init csky_memblock_init(void)
 
 	dma_contiguous_reserve(0);
 
+	arch_zone_limits_init(max_zone_pfn);
 	free_area_init(max_zone_pfn);
 }
 
-- 
2.51.0