LoongArch: Consolidate max_pfn & max_low_pfn calculation

Now there 5 places which calculate max_pfn & max_low_pfn:
1. in fdt_setup() for FDT systems;
2. in memblock_init() for ACPI systems;
3. in init_numa_memory() for NUMA systems;
4. in arch_mem_init() to recalculate for "mem=" cmdline;
5. in paging_init() to recalculate for NUMA systems.

Since memblock_init() is called both for ACPI and FDT systems, move the
calculation out of the for_each_efi_memory_desc() loop can eliminate the
first case. The last case is very questionable (may be derived from the
MIPS/Loongson code) and breaks the "mem=" cmdline, so should be removed.
And then the NUMA version of paging_init() can be also eliminated.

After consolidation there are 3 places of calculation:
1. in memblock_init() for both ACPI and FDT systems;
2. in init_numa_memory() to recalculate for NUMA systems;
3. in arch_mem_init() to recalculate for the "mem=" cmdline.

For all cases the calculation is:
max_pfn = PFN_DOWN(memblock_end_of_DRAM());
max_low_pfn = min(PFN_DOWN(HIGHMEM_START), max_pfn);

Cc: stable@vger.kernel.org
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: maoxiaochuan <maoxiaochuan@loongson.cn>

fix merge conflict
Signed-off-by: ilikara <3435193369@qq.com>

Author: maoxiaochuan

arch/loongarch/kernel/mem.c

@@ -15,7 +15,7 @@
 void __init memblock_init(void)
 {
 	u32 mem_type;
-	u64 mem_start, mem_end, mem_size;
+	u64 mem_start, mem_size;
 	efi_memory_desc_t *md;
 
 	/* Parse memory information */
@@ -24,7 +24,6 @@ void __init memblock_init(void)
 		md->phys_addr = TO_PHYS(md->phys_addr);
 		mem_start = md->phys_addr;
 		mem_size = md->num_pages << EFI_PAGE_SHIFT;
-		mem_end = mem_start + mem_size;
 
 		switch (mem_type) {
 		case EFI_LOADER_CODE:
@@ -34,8 +33,6 @@ void __init memblock_init(void)
 		case EFI_PERSISTENT_MEMORY:
 		case EFI_CONVENTIONAL_MEMORY:
 			memblock_add(mem_start, mem_size);
-			if (max_low_pfn < (mem_end >> PAGE_SHIFT))
-				max_low_pfn = mem_end >> PAGE_SHIFT;
 			break;
 		case EFI_PAL_CODE:
 		case EFI_UNUSABLE_MEMORY:
@@ -54,6 +51,8 @@ void __init memblock_init(void)
 
 	bpi_memblock_init(&max_low_pfn);
 
+	max_pfn = PFN_DOWN(memblock_end_of_DRAM());
+	max_low_pfn = min(PFN_DOWN(HIGHMEM_START), max_pfn);
 	memblock_set_current_limit(PFN_PHYS(max_low_pfn));
 
 	/* Reserve the first 2MB */

arch/loongarch/kernel/numa.c

@@ -275,7 +275,8 @@ int __init init_numa_memory(void)
 		node_mem_init(node);
 		node_set_online(node);
 	}
-	max_low_pfn = PHYS_PFN(memblock_end_of_DRAM());
+	max_pfn = PFN_DOWN(memblock_end_of_DRAM());
+	max_low_pfn = min(PFN_DOWN(HIGHMEM_START), max_pfn);
 
 	setup_nr_node_ids();
 	loongson_sysconf.nr_nodes = nr_node_ids;
@@ -286,26 +287,6 @@ int __init init_numa_memory(void)
 
 #endif
 
-void __init paging_init(void)
-{
-	unsigned int node;
-	unsigned long zones_size[MAX_NR_ZONES] = {0, };
-
-	for_each_online_node(node) {
-		unsigned long start_pfn, end_pfn;
-
-		get_pfn_range_for_nid(node, &start_pfn, &end_pfn);
-
-		if (end_pfn > max_low_pfn)
-			max_low_pfn = end_pfn;
-	}
-#ifdef CONFIG_ZONE_DMA32
-	zones_size[ZONE_DMA32] = MAX_DMA32_PFN;
-#endif
-	zones_size[ZONE_NORMAL] = max_low_pfn;
-	free_area_init(zones_size);
-}
-
 void __init mem_init(void)
 {
 	high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);

arch/loongarch/kernel/setup.c

@@ -410,8 +410,6 @@ static void __init fdt_setup(void)
 
 	early_init_dt_scan(fdt_pointer, __pa(fdt_pointer));
 	early_init_fdt_reserve_self();
-
-	max_low_pfn = PFN_PHYS(memblock_end_of_DRAM());
 #endif
 }
 
@@ -506,7 +504,8 @@ static void __init check_kernel_sections_mem(void)
 static void __init arch_mem_init(char **cmdline_p)
 {
 	/* Recalculate max_low_pfn for "mem=xxx" */
-	max_pfn = max_low_pfn = PHYS_PFN(memblock_end_of_DRAM());
+	max_pfn = PFN_DOWN(memblock_end_of_DRAM());
+	max_low_pfn = min(PFN_DOWN(HIGHMEM_START), max_pfn);
 
 	if (usermem)
 		pr_info("User-defined physical RAM map overwrite\n");

arch/loongarch/mm/init.c

@@ -60,7 +60,6 @@ int __ref page_is_ram(unsigned long pfn)
 	return memblock_is_memory(addr) && !memblock_is_reserved(addr);
 }
 
-#ifndef CONFIG_NUMA
 void __init paging_init(void)
 {
 	unsigned long max_zone_pfns[MAX_NR_ZONES];
@@ -80,7 +79,6 @@ void __init mem_init(void)
 
 	memblock_free_all();
 }
-#endif /* !CONFIG_NUMA */
 
 void __ref free_initmem(void)
 {