x86, NUMA: Drop @start/last_pfn from initmem_init()

initmem_init() extensively accesses and modifies global data
structures and the parameters aren't even followed depending on which
path is being used.  Drop @start/last_pfn and let it deal with
@max_pfn directly.  This is in preparation for further NUMA init
cleanups.

- v2: x86-32 initmem_init() weren't updated breaking 32bit builds.
  Fixed.  Found by Yinghai.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Shaohui Zheng <shaohui.zheng@intel.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: H. Peter Anvin <hpa@linux.intel.com>

arch/x86/include/asm/page_types.h

@@ -56,8 +56,7 @@ extern unsigned long init_memory_mapping(unsigned long start,
 
 void init_memory_mapping_high(void);
 
-extern void initmem_init(unsigned long start_pfn, unsigned long end_pfn,
-				int acpi, int k8);
+extern void initmem_init(int acpi, int k8);
 extern void free_initmem(void);
 
 #endif	/* !__ASSEMBLY__ */

arch/x86/kernel/setup.c

@@ -1003,7 +1003,7 @@ void __init setup_arch(char **cmdline_p)
 		amd = !amd_numa_init(0, max_pfn);
 #endif
 
-	initmem_init(0, max_pfn, acpi, amd);
+	initmem_init(acpi, amd);
 	memblock_find_dma_reserve();
 	dma32_reserve_bootmem();
 

arch/x86/mm/init_32.c

@@ -644,8 +644,7 @@ void __init find_low_pfn_range(void)
 }
 
 #ifndef CONFIG_NEED_MULTIPLE_NODES
-void __init initmem_init(unsigned long start_pfn, unsigned long end_pfn,
-				int acpi, int k8)
+void __init initmem_init(int acpi, int k8)
 {
 #ifdef CONFIG_HIGHMEM
 	highstart_pfn = highend_pfn = max_pfn;

arch/x86/mm/init_64.c

@@ -603,10 +603,9 @@ kernel_physical_mapping_init(unsigned long start,
 }
 
 #ifndef CONFIG_NUMA
-void __init initmem_init(unsigned long start_pfn, unsigned long end_pfn,
-				int acpi, int k8)
+void __init initmem_init(int acpi, int k8)
 {
-	memblock_x86_register_active_regions(0, start_pfn, end_pfn);
+	memblock_x86_register_active_regions(0, 0, max_pfn);
 	init_memory_mapping_high();
 }
 #endif

arch/x86/mm/numa_32.c

@@ -352,8 +352,7 @@ static void init_remap_allocator(int nid)
 		(ulong) node_remap_end_vaddr[nid]);
 }
 
-void __init initmem_init(unsigned long start_pfn, unsigned long end_pfn,
-				int acpi, int k8)
+void __init initmem_init(int acpi, int k8)
 {
 	int nid;
 	long kva_target_pfn;

arch/x86/mm/numa_64.c

@@ -579,8 +579,7 @@ static int __init numa_emulation(unsigned long start_pfn,
 }
 #endif /* CONFIG_NUMA_EMU */
 
-void __init initmem_init(unsigned long start_pfn, unsigned long last_pfn,
-				int acpi, int amd)
+void __init initmem_init(int acpi, int amd)
 {
 	int i;
 
@@ -588,19 +587,16 @@ void __init initmem_init(unsigned long start_pfn, unsigned long last_pfn,
 	nodes_clear(node_online_map);
 
 #ifdef CONFIG_NUMA_EMU
-	setup_physnodes(start_pfn << PAGE_SHIFT, last_pfn << PAGE_SHIFT,
-			acpi, amd);
-	if (cmdline && !numa_emulation(start_pfn, last_pfn, acpi, amd))
+	setup_physnodes(0, max_pfn << PAGE_SHIFT, acpi, amd);
+	if (cmdline && !numa_emulation(0, max_pfn, acpi, amd))
 		return;
-	setup_physnodes(start_pfn << PAGE_SHIFT, last_pfn << PAGE_SHIFT,
-			acpi, amd);
+	setup_physnodes(0, max_pfn << PAGE_SHIFT, acpi, amd);
 	nodes_clear(node_possible_map);
 	nodes_clear(node_online_map);
 #endif
 
 #ifdef CONFIG_ACPI_NUMA
-	if (!numa_off && acpi && !acpi_scan_nodes(start_pfn << PAGE_SHIFT,
-						  last_pfn << PAGE_SHIFT))
+	if (!numa_off && acpi && !acpi_scan_nodes(0, max_pfn << PAGE_SHIFT))
 		return;
 	nodes_clear(node_possible_map);
 	nodes_clear(node_online_map);
@@ -616,8 +612,7 @@ void __init initmem_init(unsigned long start_pfn, unsigned long last_pfn,
 	       numa_off ? "NUMA turned off" : "No NUMA configuration found");
 
 	printk(KERN_INFO "Faking a node at %016lx-%016lx\n",
-	       start_pfn << PAGE_SHIFT,
-	       last_pfn << PAGE_SHIFT);
+	       0LU, max_pfn << PAGE_SHIFT);
 	/* setup dummy node covering all memory */
 	memnode_shift = 63;
 	memnodemap = memnode.embedded_map;
@@ -626,9 +621,9 @@ void __init initmem_init(unsigned long start_pfn, unsigned long last_pfn,
 	node_set(0, node_possible_map);
 	for (i = 0; i < MAX_LOCAL_APIC; i++)
 		set_apicid_to_node(i, NUMA_NO_NODE);
-	memblock_x86_register_active_regions(0, start_pfn, last_pfn);
+	memblock_x86_register_active_regions(0, 0, max_pfn);
 	init_memory_mapping_high();
-	setup_node_bootmem(0, start_pfn << PAGE_SHIFT, last_pfn << PAGE_SHIFT);
+	setup_node_bootmem(0, 0, max_pfn << PAGE_SHIFT);
 	numa_init_array();
 }