Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86: enable DMAR by default
  xen: disable interrupts early, as start_kernel expects
  gpu/drm, x86, PAT: io_mapping_create_wc and resource_size_t
  gpu/drm, x86, PAT: Handle io_mapping_create_wc() errors in a clean way
  x86, Voyager: fix compile by lifting the degeneracy of phys_cpu_present_map
  x86, doc: fix references to Documentation/x86/i386/boot.txt

5 files changed, 37 insertions, 13 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 9c39095b33f..bc2fbadff9f 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1803,7 +1803,7 @@ config DMAR
 	  remapping devices.
 
 config DMAR_DEFAULT_ON
-	def_bool n
+	def_bool y
 	prompt "Enable DMA Remapping Devices by default"
 	depends on DMAR
 	help
diff --git a/arch/x86/include/asm/iomap.h b/arch/x86/include/asm/iomap.h
index c1f06289b14..86af26091d6 100644
--- a/arch/x86/include/asm/iomap.h
+++ b/arch/x86/include/asm/iomap.h
@@ -23,6 +23,9 @@
 #include <asm/pgtable.h>
 #include <asm/tlbflush.h>
 
+int
+is_io_mapping_possible(resource_size_t base, unsigned long size);
+
 void *
 iomap_atomic_prot_pfn(unsigned long pfn, enum km_type type, pgprot_t prot);
 
diff --git a/arch/x86/mach-voyager/voyager_smp.c b/arch/x86/mach-voyager/voyager_smp.c
index 7ffcdeec463..b9cc84a2a4f 100644
--- a/arch/x86/mach-voyager/voyager_smp.c
+++ b/arch/x86/mach-voyager/voyager_smp.c
@@ -65,7 +65,7 @@ static volatile unsigned long smp_invalidate_needed;
 
 /* Bitmask of CPUs present in the system - exported by i386_syms.c, used
  * by scheduler but indexed physically */
-cpumask_t phys_cpu_present_map = CPU_MASK_NONE;
+static cpumask_t voyager_phys_cpu_present_map = CPU_MASK_NONE;
 
 /* The internal functions */
 static void send_CPI(__u32 cpuset, __u8 cpi);
@@ -366,19 +366,19 @@ void __init find_smp_config(void)
 	/* set up everything for just this CPU, we can alter
 	 * this as we start the other CPUs later */
 	/* now get the CPU disposition from the extended CMOS */
-	cpus_addr(phys_cpu_present_map)[0] =
+	cpus_addr(voyager_phys_cpu_present_map)[0] =
 	    voyager_extended_cmos_read(VOYAGER_PROCESSOR_PRESENT_MASK);
-	cpus_addr(phys_cpu_present_map)[0] |=
+	cpus_addr(voyager_phys_cpu_present_map)[0] |=
 	    voyager_extended_cmos_read(VOYAGER_PROCESSOR_PRESENT_MASK + 1) << 8;
-	cpus_addr(phys_cpu_present_map)[0] |=
+	cpus_addr(voyager_phys_cpu_present_map)[0] |=
 	    voyager_extended_cmos_read(VOYAGER_PROCESSOR_PRESENT_MASK +
 				       2) << 16;
-	cpus_addr(phys_cpu_present_map)[0] |=
+	cpus_addr(voyager_phys_cpu_present_map)[0] |=
 	    voyager_extended_cmos_read(VOYAGER_PROCESSOR_PRESENT_MASK +
 				       3) << 24;
-	init_cpu_possible(&phys_cpu_present_map);
-	printk("VOYAGER SMP: phys_cpu_present_map = 0x%lx\n",
-	       cpus_addr(phys_cpu_present_map)[0]);
+	init_cpu_possible(&voyager_phys_cpu_present_map);
+	printk("VOYAGER SMP: voyager_phys_cpu_present_map = 0x%lx\n",
+	       cpus_addr(voyager_phys_cpu_present_map)[0]);
 	/* Here we set up the VIC to enable SMP */
 	/* enable the CPIs by writing the base vector to their register */
 	outb(VIC_DEFAULT_CPI_BASE, VIC_CPI_BASE_REGISTER);
@@ -628,15 +628,15 @@ void __init smp_boot_cpus(void)
 		/* now that the cat has probed the Voyager System Bus, sanity
 		 * check the cpu map */
 		if (((voyager_quad_processors | voyager_extended_vic_processors)
-		     & cpus_addr(phys_cpu_present_map)[0]) !=
-		    cpus_addr(phys_cpu_present_map)[0]) {
+		     & cpus_addr(voyager_phys_cpu_present_map)[0]) !=
+		    cpus_addr(voyager_phys_cpu_present_map)[0]) {
 			/* should panic */
 			printk("\n\n***WARNING*** "
 			       "Sanity check of CPU present map FAILED\n");
 		}
 	} else if (voyager_level == 4)
 		voyager_extended_vic_processors =
-		    cpus_addr(phys_cpu_present_map)[0];
+		    cpus_addr(voyager_phys_cpu_present_map)[0];
 
 	/* this sets up the idle task to run on the current cpu */
 	voyager_extended_cpus = 1;
@@ -670,7 +670,7 @@ void __init smp_boot_cpus(void)
 	/* loop over all the extended VIC CPUs and boot them.  The
 	 * Quad CPUs must be bootstrapped by their extended VIC cpu */
 	for (i = 0; i < nr_cpu_ids; i++) {
-		if (i == boot_cpu_id || !cpu_isset(i, phys_cpu_present_map))
+		if (i == boot_cpu_id || !cpu_isset(i, voyager_phys_cpu_present_map))
 			continue;
 		do_boot_cpu(i);
 		/* This udelay seems to be needed for the Quad boots
diff --git a/arch/x86/mm/iomap_32.c b/arch/x86/mm/iomap_32.c
index ca53224fc56..6c2b1af1692 100644
--- a/arch/x86/mm/iomap_32.c
+++ b/arch/x86/mm/iomap_32.c
@@ -20,6 +20,24 @@
 #include <asm/pat.h>
 #include <linux/module.h>
 
+#ifdef CONFIG_X86_PAE
+int
+is_io_mapping_possible(resource_size_t base, unsigned long size)
+{
+	return 1;
+}
+#else
+int
+is_io_mapping_possible(resource_size_t base, unsigned long size)
+{
+	/* There is no way to map greater than 1 << 32 address without PAE */
+	if (base + size > 0x100000000ULL)
+		return 0;
+
+	return 1;
+}
+#endif
+
 /* Map 'pfn' using fixed map 'type' and protections 'prot'
  */
 void *
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index bea215230b2..b58e9633814 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1672,6 +1672,9 @@ asmlinkage void __init xen_start_kernel(void)
 	   possible map and a non-dummy shared_info. */
 	per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
 
+	local_irq_disable();
+	early_boot_irqs_off();
+
 	xen_raw_console_write("mapping kernel into physical memory\n");
 	pgd = xen_setup_kernel_pagetable(pgd, xen_start_info->nr_pages);