[PATCH v4 15/26] x86/numa_emu: use a helper function to get MAX_DMA32_PFN

[Mike Rapoport <rppt@xxxxxxxxxx>]

From: "Mike Rapoport (Microsoft)" <rppt@xxxxxxxxxx>

This is required to make numa emulation code architecture independent so
that it can be moved to generic code in following commits.

Signed-off-by: Mike Rapoport (Microsoft) <rppt@xxxxxxxxxx>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Tested-by: Zi Yan <ziy@xxxxxxxxxx> # for x86_64 and arm64
Tested-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> [arm64 + CXL via QEMU]
Acked-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Acked-by: David Hildenbrand <david@xxxxxxxxxx>
---
 arch/x86/include/asm/numa.h  | 1 +
 arch/x86/mm/numa.c           | 5 +++++
 arch/x86/mm/numa_emulation.c | 4 ++--
 3 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/numa.h b/arch/x86/include/asm/numa.h
index 7017d540894a..b22c85c1ef18 100644
--- a/arch/x86/include/asm/numa.h
+++ b/arch/x86/include/asm/numa.h
@@ -74,6 +74,7 @@ void debug_cpumask_set_cpu(int cpu, int node, bool enable);
 int numa_emu_cmdline(char *str);
 void __init numa_emu_update_cpu_to_node(int *emu_nid_to_phys,
 					unsigned int nr_emu_nids);
+u64 __init numa_emu_dma_end(void);
 #else /* CONFIG_NUMA_EMU */
 static inline int numa_emu_cmdline(char *str)
 {
diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index ea3fc2d866e2..2acf8d17b9b8 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -872,6 +872,11 @@ void __init numa_emu_update_cpu_to_node(int *emu_nid_to_phys,
 		__apicid_to_node[i] = j < nr_emu_nids ? j : 0;
 	}
 }
+
+u64 __init numa_emu_dma_end(void)
+{
+	return PFN_PHYS(MAX_DMA32_PFN);
+}
 #endif /* CONFIG_NUMA_EMU */
 
 #ifdef CONFIG_NUMA_KEEP_MEMINFO
diff --git a/arch/x86/mm/numa_emulation.c b/arch/x86/mm/numa_emulation.c
index f2746e52ab93..fb4814497446 100644
--- a/arch/x86/mm/numa_emulation.c
+++ b/arch/x86/mm/numa_emulation.c
@@ -128,7 +128,7 @@ static int __init split_nodes_interleave(struct numa_meminfo *ei,
 	 */
 	while (!nodes_empty(physnode_mask)) {
 		for_each_node_mask(i, physnode_mask) {
-			u64 dma32_end = PFN_PHYS(MAX_DMA32_PFN);
+			u64 dma32_end = numa_emu_dma_end();
 			u64 start, limit, end;
 			int phys_blk;
 
@@ -275,7 +275,7 @@ static int __init split_nodes_size_interleave_uniform(struct numa_meminfo *ei,
 	 */
 	while (!nodes_empty(physnode_mask)) {
 		for_each_node_mask(i, physnode_mask) {
-			u64 dma32_end = PFN_PHYS(MAX_DMA32_PFN);
+			u64 dma32_end = numa_emu_dma_end();
 			u64 start, limit, end;
 			int phys_blk;
 
-- 
2.43.0