x86-64, NUMA: Unify {acpi|amd}_{numa_init|scan_nodes}() arguments and return values

The functions used during NUMA initialization - *_numa_init() and
*_scan_nodes() - have different arguments and return values. Unify
them such that they all take no argument and return 0 on success and
-errno on failure. This is in preparation for further NUMA init
cleanups.

Signed-off-by: Tejun Heo <[e-mail]>
Cc: Yinghai Lu <[e-mail]>
Cc: Brian Gerst <[e-mail]>
Cc: Cyrill Gorcunov <[e-mail]>
Cc: Shaohui Zheng <[e-mail]>
Cc: David Rientjes <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: H. Peter Anvin <[e-mail]>

arch/x86/include/asm/acpi.h

···
 extern int acpi_numa;
 extern void acpi_get_nodes(struct bootnode *physnodes, unsigned long start,
 				unsigned long end);
-extern int acpi_scan_nodes(unsigned long start, unsigned long end);
+extern int acpi_scan_nodes(void);
 #define NR_NODE_MEMBLKS (MAX_NUMNODES*2)
 
 #ifdef CONFIG_NUMA_EMU

arch/x86/include/asm/amd_nb.h

···
 extern int early_is_amd_nb(u32 value);
 extern int amd_cache_northbridges(void);
 extern void amd_flush_garts(void);
-extern int amd_numa_init(unsigned long start_pfn, unsigned long end_pfn);
+extern int amd_numa_init(void);
 extern int amd_scan_nodes(void);
 extern int amd_get_subcaches(int);
 extern int amd_set_subcaches(int, int);

arch/x86/kernel/setup.c

···
 	/*
 	 * Parse SRAT to discover nodes.
 	 */
-	acpi = acpi_numa_init();
+	acpi = !acpi_numa_init();
 #endif
 
 #ifdef CONFIG_AMD_NUMA
 	if (!acpi)
-		amd = !amd_numa_init(0, max_pfn);
+		amd = !amd_numa_init();
 #endif
 
 	initmem_init(acpi, amd);

arch/x86/mm/amdtopology_64.c

···
 		return num;
 	}
 
-	return -1;
+	return -ENOENT;
 }
 
 static __init void early_get_boot_cpu_id(void)
···
 #endif
 }
 
-int __init amd_numa_init(unsigned long start_pfn, unsigned long end_pfn)
+int __init amd_numa_init(void)
 {
-	unsigned long start = PFN_PHYS(start_pfn);
-	unsigned long end = PFN_PHYS(end_pfn);
+	unsigned long start = PFN_PHYS(0);
+	unsigned long end = PFN_PHYS(max_pfn);
 	unsigned numnodes;
 	unsigned long prevbase;
 	int i, nb, found = 0;
 	u32 nodeid, reg;
 
 	if (!early_pci_allowed())
-		return -1;
+		return -EINVAL;
 
 	nb = find_northbridge();
 	if (nb < 0)
···
 	reg = read_pci_config(0, nb, 0, 0x60);
 	numnodes = ((reg >> 4) & 0xF) + 1;
 	if (numnodes <= 1)
-		return -1;
+		return -ENOENT;
 
 	pr_info("Number of physical nodes %d\n", numnodes);
 
···
 		if ((base >> 8) & 3 || (limit >> 8) & 3) {
 			pr_err("Node %d using interleaving mode %lx/%lx\n",
 			       nodeid, (base >> 8) & 3, (limit >> 8) & 3);
-			return -1;
+			return -EINVAL;
 		}
 		if (node_isset(nodeid, nodes_parsed)) {
 			pr_info("Node %d already present, skipping\n",
···
 		if (prevbase > base) {
 			pr_err("Node map not sorted %lx,%lx\n",
 			       prevbase, base);
-			return -1;
+			return -EINVAL;
 		}
 
 		pr_info("Node %d MemBase %016lx Limit %016lx\n",
···
 	}
 
 	if (!found)
-		return -1;
+		return -ENOENT;
 	return 0;
 }
 

arch/x86/mm/numa_64.c

···
 #endif
 
 #ifdef CONFIG_ACPI_NUMA
-	if (!numa_off && acpi && !acpi_scan_nodes(0, max_pfn << PAGE_SHIFT))
+	if (!numa_off && acpi && !acpi_scan_nodes())
 		return;
 	nodes_clear(node_possible_map);
 	nodes_clear(node_online_map);

arch/x86/mm/srat_64.c

···
 #endif /* CONFIG_NUMA_EMU */
 
 /* Use the information discovered above to actually set up the nodes. */
-int __init acpi_scan_nodes(unsigned long start, unsigned long end)
+int __init acpi_scan_nodes(void)
 {
 	int i;
 
···
 
 	/* First clean up the node list */
 	for (i = 0; i < MAX_NUMNODES; i++)
-		cutoff_node(i, start, end);
+		cutoff_node(i, 0, max_pfn << PAGE_SHIFT);
 
 	/*
 	 * Join together blocks on the same node, holes between

drivers/acpi/numa.c

···
 
 int __init acpi_numa_init(void)
 {
-	int ret = 0;
+	int cnt = 0;
 
 	/*
 	 * Should not limit number with cpu num that is from NR_CPUS or nr_cpus=
···
 				     acpi_parse_x2apic_affinity, 0);
 		acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
 				     acpi_parse_processor_affinity, 0);
-		ret = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
+		cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
 					    acpi_parse_memory_affinity,
 					    NR_NODE_MEMBLKS);
 	}
···
 	acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
 
 	acpi_numa_arch_fixup();
-	return ret;
+
+	if (cnt <= 0)
+		return cnt ?: -ENOENT;
+	return 0;
 }
 
 int acpi_get_pxm(acpi_handle h)