x86: remove end_pfn in 64bit

and use max_pfn directly.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

14 files changed, 29 insertions, 31 deletions

diff --git a/arch/x86/kernel/aperture_64.c b/arch/x86/kernel/aperture_64.c
index 600470d464fa..9f907806c1a5 100644
--- a/arch/x86/kernel/aperture_64.c
+++ b/arch/x86/kernel/aperture_64.c
@@ -407,7 +407,9 @@ void __init gart_iommu_hole_init(void)
                                     agp_aper_base == aper_base &&
                                     agp_aper_order == aper_order) {
                                         /* the same between two setting from NB and agp */
-                                        if (!no_iommu && end_pfn > MAX_DMA32_PFN && !printed_gart_size_msg) {
+                                        if (!no_iommu &&
+                                            max_pfn > MAX_DMA32_PFN &&
+                                            !printed_gart_size_msg) {
                                                 printk(KERN_ERR "you are using iommu with agp, but GART size is less than 64M\n");
                                                 printk(KERN_ERR "please increase GART size in your BIOS setup\n");
                                                 printk(KERN_ERR "if BIOS doesn't have that option, contact your HW vendor!\n");
@@ -448,7 +450,7 @@ out:
                 /* Got the aperture from the AGP bridge */
         } else if (swiotlb && !valid_agp) {
                 /* Do nothing */
-        } else if ((!no_iommu && end_pfn > MAX_DMA32_PFN) ||
+        } else if ((!no_iommu && max_pfn > MAX_DMA32_PFN) ||
                    force_iommu ||
                    valid_agp ||
                    fallback_aper_force) {
diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 1b76b25b4d9a..3900ff51bc68 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -527,7 +527,7 @@ __init void e820_setup_gap(void)
 
 #ifdef CONFIG_X86_64
         if (!found) {
-                gapstart = (end_pfn << PAGE_SHIFT) + 1024*1024;
+                gapstart = (max_pfn << PAGE_SHIFT) + 1024*1024;
                 printk(KERN_ERR "PCI: Warning: Cannot find a gap in the 32bit "
                        "address range\n"
                        KERN_ERR "PCI: Unassigned devices with 32bit resource "
diff --git a/arch/x86/kernel/early-quirks.c b/arch/x86/kernel/early-quirks.c
index 84fd9f2a28ff..a4665f37cfc5 100644
--- a/arch/x86/kernel/early-quirks.c
+++ b/arch/x86/kernel/early-quirks.c
@@ -50,7 +50,7 @@ static void __init fix_hypertransport_config(int num, int slot, int func)
 static void __init via_bugs(int  num, int slot, int func)
 {
 #ifdef CONFIG_GART_IOMMU
-        if ((end_pfn > MAX_DMA32_PFN ||  force_iommu) &&
+        if ((max_pfn > MAX_DMA32_PFN ||  force_iommu) &&
             !gart_iommu_aperture_allowed) {
                 printk(KERN_INFO
                        "Looks like a VIA chipset. Disabling IOMMU."
diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c
index 576a03db4511..7830dc4a8380 100644
--- a/arch/x86/kernel/machine_kexec_64.c
+++ b/arch/x86/kernel/machine_kexec_64.c
@@ -110,7 +110,7 @@ static int init_pgtable(struct kimage *image, unsigned long start_pgtable)
 {
         pgd_t *level4p;
         level4p = (pgd_t *)__va(start_pgtable);
-        return init_level4_page(image, level4p, 0, end_pfn << PAGE_SHIFT);
+        return init_level4_page(image, level4p, 0, max_pfn << PAGE_SHIFT);
 }
 
 static void set_idt(void *newidt, u16 limit)
diff --git a/arch/x86/kernel/pci-calgary_64.c b/arch/x86/kernel/pci-calgary_64.c
index e28ec497e142..6959b5c45df4 100644
--- a/arch/x86/kernel/pci-calgary_64.c
+++ b/arch/x86/kernel/pci-calgary_64.c
@@ -1394,7 +1394,7 @@ void __init detect_calgary(void)
                 return;
         }
 
-        specified_table_size = determine_tce_table_size(end_pfn * PAGE_SIZE);
+        specified_table_size = determine_tce_table_size(max_pfn * PAGE_SIZE);
 
         for (bus = 0; bus < MAX_PHB_BUS_NUM; bus++) {
                 struct calgary_bus_info *info = &bus_info[bus];
@@ -1459,7 +1459,7 @@ int __init calgary_iommu_init(void)
         if (ret) {
                 printk(KERN_ERR "PCI-DMA: Calgary init failed %d, "
                        "falling back to no_iommu\n", ret);
-                if (end_pfn > MAX_DMA32_PFN)
+                if (max_pfn > MAX_DMA32_PFN)
                         printk(KERN_ERR "WARNING more than 4GB of memory, "
                                         "32bit PCI may malfunction.\n");
                 return ret;
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index cb0bdf440715..8467ec2320f1 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -75,7 +75,7 @@ early_param("dma32_size", parse_dma32_size_opt);
 void __init dma32_reserve_bootmem(void)
 {
         unsigned long size, align;
-        if (end_pfn <= MAX_DMA32_PFN)
+        if (max_pfn <= MAX_DMA32_PFN)
                 return;
 
         /*
@@ -94,7 +94,7 @@ void __init dma32_reserve_bootmem(void)
 static void __init dma32_free_bootmem(void)
 {
 
-        if (end_pfn <= MAX_DMA32_PFN)
+        if (max_pfn <= MAX_DMA32_PFN)
                 return;
 
         if (!dma32_bootmem_ptr)
diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index 021f3c684a62..d0d18db5d2a4 100644
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/arch/x86/kernel/pci-gart_64.c
@@ -751,10 +751,10 @@ void __init gart_iommu_init(void)
                 return;
 
         if (no_iommu ||
-            (!force_iommu && end_pfn <= MAX_DMA32_PFN) ||
+            (!force_iommu && max_pfn <= MAX_DMA32_PFN) ||
             !gart_iommu_aperture ||
             (no_agp && init_k8_gatt(&info) < 0)) {
-                if (end_pfn > MAX_DMA32_PFN) {
+                if (max_pfn > MAX_DMA32_PFN) {
                         printk(KERN_WARNING "More than 4GB of memory "
                                           "but GART IOMMU not available.\n"
                                KERN_WARNING "falling back to iommu=soft.\n");
diff --git a/arch/x86/kernel/pci-swiotlb_64.c b/arch/x86/kernel/pci-swiotlb_64.c
index 490da7f4b8d0..82299cd1d04d 100644
--- a/arch/x86/kernel/pci-swiotlb_64.c
+++ b/arch/x86/kernel/pci-swiotlb_64.c
@@ -38,7 +38,7 @@ const struct dma_mapping_ops swiotlb_dma_ops = {
 void __init pci_swiotlb_init(void)
 {
         /* don't initialize swiotlb if iommu=off (no_iommu=1) */
-        if (!iommu_detected && !no_iommu && end_pfn > MAX_DMA32_PFN)
+        if (!iommu_detected && !no_iommu && max_pfn > MAX_DMA32_PFN)
                swiotlb = 1;
         if (swiotlb_force)
                 swiotlb = 1;
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 6eced2f10734..d5d4b04d48a4 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -49,11 +49,6 @@
 #include <asm/cacheflush.h>
 
 /*
- * PFN of last memory page.
- */
-unsigned long end_pfn;
-
-/*
  * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
  * The direct mapping extends to max_pfn_mapped, so that we can directly access
  * apertures, ACPI and other tables without having to play with fixmaps.
@@ -586,9 +581,9 @@ void __init paging_init(void)
         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
         max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
         max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
-        max_zone_pfns[ZONE_NORMAL] = end_pfn;
+        max_zone_pfns[ZONE_NORMAL] = max_pfn;
 
-        memory_present(0, 0, end_pfn);
+        memory_present(0, 0, max_pfn);
         sparse_init();
         free_area_init_nodes(max_zone_pfns);
 }
@@ -670,8 +665,8 @@ void __init mem_init(void)
 #else
         totalram_pages = free_all_bootmem();
 #endif
-        reservedpages = end_pfn - totalram_pages -
-                                        absent_pages_in_range(0, end_pfn);
+        reservedpages = max_pfn - totalram_pages -
+                                        absent_pages_in_range(0, max_pfn);
         after_bootmem = 1;
 
         codesize =  (unsigned long) &_etext - (unsigned long) &_text;
@@ -690,7 +685,7 @@ void __init mem_init(void)
         printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
                                 "%ldk reserved, %ldk data, %ldk init)\n",
                 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
-                end_pfn << (PAGE_SHIFT-10),
+                max_pfn << (PAGE_SHIFT-10),
                 codesize >> 10,
                 reservedpages << (PAGE_SHIFT-10),
                 datasize >> 10,
@@ -784,7 +779,7 @@ int __init reserve_bootmem_generic(unsigned long phys, unsigned long len,
 #endif
         unsigned long pfn = phys >> PAGE_SHIFT;
 
-        if (pfn >= end_pfn) {
+        if (pfn >= max_pfn) {
                 /*
                  * This can happen with kdump kernels when accessing
                  * firmware tables:
diff --git a/arch/x86/mm/k8topology_64.c b/arch/x86/mm/k8topology_64.c
index 317573ec9256..41f1b5c00a1d 100644
--- a/arch/x86/mm/k8topology_64.c
+++ b/arch/x86/mm/k8topology_64.c
@@ -143,8 +143,8 @@ int __init k8_scan_nodes(unsigned long start, unsigned long end)
                 limit |= (1<<24)-1;
                 limit++;
 
-                if (limit > end_pfn << PAGE_SHIFT)
-                        limit = end_pfn << PAGE_SHIFT;
+                if (limit > max_pfn << PAGE_SHIFT)
+                        limit = max_pfn << PAGE_SHIFT;
                 if (limit <= base)
                         continue;
 
diff --git a/arch/x86/mm/numa_64.c b/arch/x86/mm/numa_64.c
index 316e5f961ef0..b432d5781773 100644
--- a/arch/x86/mm/numa_64.c
+++ b/arch/x86/mm/numa_64.c
@@ -86,7 +86,7 @@ static int __init allocate_cachealigned_memnodemap(void)
 
         addr = 0x8000;
         nodemap_size = round_up(sizeof(s16) * memnodemapsize, L1_CACHE_BYTES);
-        nodemap_addr = find_e820_area(addr, end_pfn<<PAGE_SHIFT,
+        nodemap_addr = find_e820_area(addr, max_pfn<<PAGE_SHIFT,
                                       nodemap_size, L1_CACHE_BYTES);
         if (nodemap_addr == -1UL) {
                 printk(KERN_ERR
@@ -579,7 +579,7 @@ void __init paging_init(void)
         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
         max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
         max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
-        max_zone_pfns[ZONE_NORMAL] = end_pfn;
+        max_zone_pfns[ZONE_NORMAL] = max_pfn;
 
         sparse_memory_present_with_active_regions(MAX_NUMNODES);
         sparse_init();
diff --git a/arch/x86/mm/srat_64.c b/arch/x86/mm/srat_64.c
index b67f5a16755f..0fd67b81a8b6 100644
--- a/arch/x86/mm/srat_64.c
+++ b/arch/x86/mm/srat_64.c
@@ -299,7 +299,7 @@ static int __init nodes_cover_memory(const struct bootnode *nodes)
                         pxmram = 0;
         }
 
-        e820ram = end_pfn - absent_pages_in_range(0, end_pfn);
+        e820ram = max_pfn - absent_pages_in_range(0, max_pfn);
         /* We seem to lose 3 pages somewhere. Allow a bit of slack. */
         if ((long)(e820ram - pxmram) >= 1*1024*1024) {
                 printk(KERN_ERR
diff --git a/arch/x86/power/hibernate_64.c b/arch/x86/power/hibernate_64.c
index b542355e0e34..6dd000dd7933 100644
--- a/arch/x86/power/hibernate_64.c
+++ b/arch/x86/power/hibernate_64.c
@@ -83,7 +83,7 @@ static int set_up_temporary_mappings(void)
 
         /* Set up the direct mapping from scratch */
         start = (unsigned long)pfn_to_kaddr(0);
-        end = (unsigned long)pfn_to_kaddr(end_pfn);
+        end = (unsigned long)pfn_to_kaddr(max_pfn);
 
         for (; start < end; start = next) {
                 pud_t *pud = (pud_t *)get_safe_page(GFP_ATOMIC);
diff --git a/include/asm-x86/page_64.h b/include/asm-x86/page_64.h
index ac37643078e7..cac5b9e78265 100644
--- a/include/asm-x86/page_64.h
+++ b/include/asm-x86/page_64.h
@@ -58,7 +58,8 @@
 void clear_page(void *page);
 void copy_page(void *to, void *from);
 
-extern unsigned long end_pfn;
+/* duplicated to the one in bootmem.h */
+extern unsigned long max_pfn;
 extern unsigned long phys_base;
 
 extern unsigned long __phys_addr(unsigned long);
@@ -87,7 +88,7 @@ extern void initmem_init(unsigned long start_pfn, unsigned long end_pfn);
 #endif  /* !__ASSEMBLY__ */
 
 #ifdef CONFIG_FLATMEM
-#define pfn_valid(pfn)          ((pfn) < end_pfn)
+#define pfn_valid(pfn)          ((pfn) < max_pfn)
 #endif