Merge git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86

* git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86:
  x86: fix lguest build failure
  x86: reenable support for system without on node0
  x86: CPA: avoid double checking of alias ranges
  x86: CPA no alias checking for _NX
  x86: zap invalid and unused pmds in early boot
  x86: CPA, fix alias checks

arch/x86/kernel/asm-offsets_32.c

@@ -20,10 +20,8 @@
 
 #include <xen/interface/xen.h>
 
-#ifdef CONFIG_LGUEST_GUEST
 #include <linux/lguest.h>
 #include "../../../drivers/lguest/lg.h"
-#endif
 
 #define DEFINE(sym, val) \
         asm volatile("\n->" #sym " %0 " #val : : "i" (val))
@@ -134,6 +132,10 @@ void foo(void)
 	BLANK();
 	OFFSET(LGUEST_DATA_irq_enabled, lguest_data, irq_enabled);
 	OFFSET(LGUEST_DATA_pgdir, lguest_data, pgdir);
+#endif
+
+#ifdef CONFIG_LGUEST
+	BLANK();
 	OFFSET(LGUEST_PAGES_host_gdt_desc, lguest_pages, state.host_gdt_desc);
 	OFFSET(LGUEST_PAGES_host_idt_desc, lguest_pages, state.host_idt_desc);
 	OFFSET(LGUEST_PAGES_host_cr3, lguest_pages, state.host_cr3);

arch/x86/kernel/head64.c

@@ -88,6 +88,9 @@ void __init x86_64_start_kernel(char * real_mode_data)
 	/* Make NULL pointers segfault */
 	zap_identity_mappings();
 
+	/* Cleanup the over mapped high alias */
+	cleanup_highmap();
+
 	for (i = 0; i < IDT_ENTRIES; i++) {
 #ifdef CONFIG_EARLY_PRINTK
 		set_intr_gate(i, &early_idt_handlers[i]);

arch/x86/kernel/head_64.S

@@ -107,8 +107,13 @@ startup_64:
 	movq	%rdx, 0(%rbx, %rax, 8)
 ident_complete:
 
-	/* Fixup the kernel text+data virtual addresses
+	/*
+	 * Fixup the kernel text+data virtual addresses. Note that
+	 * we might write invalid pmds, when the kernel is relocated
+	 * cleanup_highmap() fixes this up along with the mappings
+	 * beyond _end.
 	 */
+
 	leaq	level2_kernel_pgt(%rip), %rdi
 	leaq	4096(%rdi), %r8
 	/* See if it is a valid page table entry */

arch/x86/mm/init_64.c

@@ -171,6 +171,33 @@ set_pte_phys(unsigned long vaddr, unsigned long phys, pgprot_t prot)
 	__flush_tlb_one(vaddr);
 }
 
+/*
+ * The head.S code sets up the kernel high mapping from:
+ * __START_KERNEL_map to __START_KERNEL_map + KERNEL_TEXT_SIZE
+ *
+ * phys_addr holds the negative offset to the kernel, which is added
+ * to the compile time generated pmds. This results in invalid pmds up
+ * to the point where we hit the physaddr 0 mapping.
+ *
+ * We limit the mappings to the region from _text to _end.  _end is
+ * rounded up to the 2MB boundary. This catches the invalid pmds as
+ * well, as they are located before _text:
+ */
+void __init cleanup_highmap(void)
+{
+	unsigned long vaddr = __START_KERNEL_map;
+	unsigned long end = round_up((unsigned long)_end, PMD_SIZE) - 1;
+	pmd_t *pmd = level2_kernel_pgt;
+	pmd_t *last_pmd = pmd + PTRS_PER_PMD;
+
+	for (; pmd < last_pmd; pmd++, vaddr += PMD_SIZE) {
+		if (!pmd_present(*pmd))
+			continue;
+		if (vaddr < (unsigned long) _text || vaddr > end)
+			set_pmd(pmd, __pmd(0));
+	}
+}
+
 /* NOTE: this is meant to be run only at boot */
 void __init
 __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)

arch/x86/mm/numa_64.c

@@ -494,25 +494,29 @@ void __init numa_initmem_init(unsigned long start_pfn, unsigned long end_pfn)
 	int i;
 
 	nodes_clear(node_possible_map);
+	nodes_clear(node_online_map);
 
 #ifdef CONFIG_NUMA_EMU
 	if (cmdline && !numa_emulation(start_pfn, end_pfn))
 		return;
 	nodes_clear(node_possible_map);
+	nodes_clear(node_online_map);
 #endif
 
 #ifdef CONFIG_ACPI_NUMA
 	if (!numa_off && !acpi_scan_nodes(start_pfn << PAGE_SHIFT,
 					  end_pfn << PAGE_SHIFT))
 		return;
 	nodes_clear(node_possible_map);
+	nodes_clear(node_online_map);
 #endif
 
 #ifdef CONFIG_K8_NUMA
 	if (!numa_off && !k8_scan_nodes(start_pfn<<PAGE_SHIFT,
 					end_pfn<<PAGE_SHIFT))
 		return;
 	nodes_clear(node_possible_map);
+	nodes_clear(node_online_map);
 #endif
 	printk(KERN_INFO "%s\n",
 	       numa_off ? "NUMA turned off" : "No NUMA configuration found");
@@ -524,7 +528,6 @@ void __init numa_initmem_init(unsigned long start_pfn, unsigned long end_pfn)
 	memnode_shift = 63;
 	memnodemap = memnode.embedded_map;
 	memnodemap[0] = 0;
-	nodes_clear(node_online_map);
 	node_set_online(0);
 	node_set(0, node_possible_map);
 	for (i = 0; i < NR_CPUS; i++)