30 files changed, 513 insertions, 302 deletions

diff --git a/arch/i386/kernel/apic.c b/arch/i386/kernel/apic.c
index 5546ddebec33..9204be6eedb3 100644
--- a/arch/i386/kernel/apic.c
+++ b/arch/i386/kernel/apic.c
@@ -803,6 +803,7 @@ no_apic:
 
 void __init init_apic_mappings(void)
 {
+        unsigned int orig_apicid;
         unsigned long apic_phys;
 
         /*
@@ -824,8 +825,11 @@ void __init init_apic_mappings(void)
          * Fetch the APIC ID of the BSP in case we have a
          * default configuration (or the MP table is broken).
          */
-        if (boot_cpu_physical_apicid == -1U)
-                boot_cpu_physical_apicid = GET_APIC_ID(apic_read(APIC_ID));
+        orig_apicid = boot_cpu_physical_apicid;
+        boot_cpu_physical_apicid = GET_APIC_ID(apic_read(APIC_ID));
+        if ((orig_apicid != -1U) && (orig_apicid != boot_cpu_physical_apicid))
+                printk(KERN_WARNING "Boot APIC ID in local APIC unexpected (%d vs %d)",
+                        orig_apicid, boot_cpu_physical_apicid);
 
 #ifdef CONFIG_X86_IO_APIC
         {
@@ -1046,10 +1050,11 @@ static unsigned int calibration_result;
 
 void __init setup_boot_APIC_clock(void)
 {
+        unsigned long flags;
         apic_printk(APIC_VERBOSE, "Using local APIC timer interrupts.\n");
         using_apic_timer = 1;
 
-        local_irq_disable();
+        local_irq_save(flags);
 
         calibration_result = calibrate_APIC_clock();
         /*
@@ -1057,7 +1062,7 @@ void __init setup_boot_APIC_clock(void)
          */
         setup_APIC_timer(calibration_result);
 
-        local_irq_enable();
+        local_irq_restore(flags);
 }
 
 void __devinit setup_secondary_APIC_clock(void)
@@ -1254,40 +1259,81 @@ fastcall void smp_error_interrupt(struct pt_regs *regs)
 }
 
 /*
- * This initializes the IO-APIC and APIC hardware if this is
- * a UP kernel.
+ * This initializes the IO-APIC and APIC hardware.
  */
-int __init APIC_init_uniprocessor (void)
+int __init APIC_init(void)
 {
-        if (enable_local_apic < 0)
-                clear_bit(X86_FEATURE_APIC, boot_cpu_data.x86_capability);
+        if (enable_local_apic < 0) {
+                printk(KERN_INFO "APIC disabled\n");
+                return -1;
+        }
 
-        if (!smp_found_config && !cpu_has_apic)
+        /* See if we have a SMP configuration or have forced enabled
+         * the local apic.
+         */
+        if (!smp_found_config && !acpi_lapic && !cpu_has_apic) {
+                enable_local_apic = -1;
                 return -1;
+        }
 
         /*
-         * Complain if the BIOS pretends there is one.
+         * Complain if the BIOS pretends there is an apic.
+         * Then get out because we don't have an a local apic.
          */
         if (!cpu_has_apic && APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) {
                 printk(KERN_ERR "BIOS bug, local APIC #%d not detected!...\n",
                         boot_cpu_physical_apicid);
+                printk(KERN_ERR "... forcing use of dummy APIC emulation. (tell your hw vendor)\n");
+                enable_local_apic = -1;
                 return -1;
         }
 
         verify_local_APIC();
 
+        /*
+         * Should not be necessary because the MP table should list the boot
+         * CPU too, but we do it for the sake of robustness anyway.
+         * Makes no sense to do this check in clustered apic mode, so skip it
+         */
+        if (!check_phys_apicid_present(boot_cpu_physical_apicid)) {
+                printk("weird, boot CPU (#%d) not listed by the BIOS.\n",
+                                boot_cpu_physical_apicid);
+                physid_set(boot_cpu_physical_apicid, phys_cpu_present_map);
+        }
+
+        /*
+         * Switch from PIC to APIC mode.
+         */
         connect_bsp_APIC();
+        setup_local_APIC();
 
-        phys_cpu_present_map = physid_mask_of_physid(boot_cpu_physical_apicid);
+#ifdef CONFIG_X86_IO_APIC
+        /*
+         * Now start the IO-APICs
+         */
+        if (smp_found_config && !skip_ioapic_setup && nr_ioapics)
+                setup_IO_APIC();
+#endif
+        return 0;
+}
 
-        setup_local_APIC();
+void __init APIC_late_time_init(void)
+{
+        /* Improve our loops per jiffy estimate */
+        loops_per_jiffy = ((1000 + HZ - 1)/HZ)*cpu_khz;
+        boot_cpu_data.loops_per_jiffy = loops_per_jiffy;
+        cpu_data[0].loops_per_jiffy = loops_per_jiffy;
+
+        /* setup_apic_nmi_watchdog doesn't work properly before cpu_khz is
+         * initialized.  So redo it here to ensure the boot cpu is setup
+         * properly.
+         */
+        if (nmi_watchdog == NMI_LOCAL_APIC)
+                setup_apic_nmi_watchdog();
 
 #ifdef CONFIG_X86_IO_APIC
-        if (smp_found_config)
-                if (!skip_ioapic_setup && nr_ioapics)
-                        setup_IO_APIC();
+        if (smp_found_config && !skip_ioapic_setup && nr_ioapics)
+                IO_APIC_late_time_init();
 #endif
         setup_boot_APIC_clock();
-
-        return 0;
 }
diff --git a/arch/i386/kernel/apm.c b/arch/i386/kernel/apm.c
index d7811c4e8b50..d2ef0c2aa93e 100644
--- a/arch/i386/kernel/apm.c
+++ b/arch/i386/kernel/apm.c
@@ -597,12 +597,14 @@ static u8 apm_bios_call(u32 func, u32 ebx_in, u32 ecx_in,
         cpumask_t               cpus;
         int                     cpu;
         struct desc_struct      save_desc_40;
+        struct desc_struct      *gdt;
 
         cpus = apm_save_cpus();
         
         cpu = get_cpu();
-        save_desc_40 = per_cpu(cpu_gdt_table, cpu)[0x40 / 8];
-        per_cpu(cpu_gdt_table, cpu)[0x40 / 8] = bad_bios_desc;
+        gdt = get_cpu_gdt_table(cpu);
+        save_desc_40 = gdt[0x40 / 8];
+        gdt[0x40 / 8] = bad_bios_desc;
 
         local_save_flags(flags);
         APM_DO_CLI;
@@ -610,7 +612,7 @@ static u8 apm_bios_call(u32 func, u32 ebx_in, u32 ecx_in,
         apm_bios_call_asm(func, ebx_in, ecx_in, eax, ebx, ecx, edx, esi);
         APM_DO_RESTORE_SEGS;
         local_irq_restore(flags);
-        per_cpu(cpu_gdt_table, cpu)[0x40 / 8] = save_desc_40;
+        gdt[0x40 / 8] = save_desc_40;
         put_cpu();
         apm_restore_cpus(cpus);
         
@@ -639,13 +641,14 @@ static u8 apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax)
         cpumask_t               cpus;
         int                     cpu;
         struct desc_struct      save_desc_40;
-
+        struct desc_struct      *gdt;
 
         cpus = apm_save_cpus();
         
         cpu = get_cpu();
-        save_desc_40 = per_cpu(cpu_gdt_table, cpu)[0x40 / 8];
-        per_cpu(cpu_gdt_table, cpu)[0x40 / 8] = bad_bios_desc;
+        gdt = get_cpu_gdt_table(cpu);
+        save_desc_40 = gdt[0x40 / 8];
+        gdt[0x40 / 8] = bad_bios_desc;
 
         local_save_flags(flags);
         APM_DO_CLI;
@@ -653,7 +656,7 @@ static u8 apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax)
         error = apm_bios_call_simple_asm(func, ebx_in, ecx_in, eax);
         APM_DO_RESTORE_SEGS;
         local_irq_restore(flags);
-        __get_cpu_var(cpu_gdt_table)[0x40 / 8] = save_desc_40;
+        gdt[0x40 / 8] = save_desc_40;
         put_cpu();
         apm_restore_cpus(cpus);
         return error;
@@ -2295,35 +2298,36 @@ static int __init apm_init(void)
         apm_bios_entry.segment = APM_CS;
 
         for (i = 0; i < NR_CPUS; i++) {
-                set_base(per_cpu(cpu_gdt_table, i)[APM_CS >> 3],
+                struct desc_struct *gdt = get_cpu_gdt_table(i);
+                set_base(gdt[APM_CS >> 3],
                          __va((unsigned long)apm_info.bios.cseg << 4));
-                set_base(per_cpu(cpu_gdt_table, i)[APM_CS_16 >> 3],
+                set_base(gdt[APM_CS_16 >> 3],
                          __va((unsigned long)apm_info.bios.cseg_16 << 4));
-                set_base(per_cpu(cpu_gdt_table, i)[APM_DS >> 3],
+                set_base(gdt[APM_DS >> 3],
                          __va((unsigned long)apm_info.bios.dseg << 4));
 #ifndef APM_RELAX_SEGMENTS
                 if (apm_info.bios.version == 0x100) {
 #endif
                         /* For ASUS motherboard, Award BIOS rev 110 (and others?) */
-                        _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_CS >> 3], 64 * 1024 - 1);
+                        _set_limit((char *)&gdt[APM_CS >> 3], 64 * 1024 - 1);
                         /* For some unknown machine. */
-                        _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_CS_16 >> 3], 64 * 1024 - 1);
+                        _set_limit((char *)&gdt[APM_CS_16 >> 3], 64 * 1024 - 1);
                         /* For the DEC Hinote Ultra CT475 (and others?) */
-                        _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_DS >> 3], 64 * 1024 - 1);
+                        _set_limit((char *)&gdt[APM_DS >> 3], 64 * 1024 - 1);
 #ifndef APM_RELAX_SEGMENTS
                 } else {
-                        _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_CS >> 3],
+                        _set_limit((char *)&gdt[APM_CS >> 3],
                                 (apm_info.bios.cseg_len - 1) & 0xffff);
-                        _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_CS_16 >> 3],
+                        _set_limit((char *)&gdt[APM_CS_16 >> 3],
                                 (apm_info.bios.cseg_16_len - 1) & 0xffff);
-                        _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_DS >> 3],
+                        _set_limit((char *)&gdt[APM_DS >> 3],
                                 (apm_info.bios.dseg_len - 1) & 0xffff);
                       /* workaround for broken BIOSes */
                         if (apm_info.bios.cseg_len <= apm_info.bios.offset)
-                                _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_CS >> 3], 64 * 1024 -1);
+                                _set_limit((char *)&gdt[APM_CS >> 3], 64 * 1024 -1);
                        if (apm_info.bios.dseg_len <= 0x40) { /* 0x40 * 4kB == 64kB */
                                 /* for the BIOS that assumes granularity = 1 */
-                                per_cpu(cpu_gdt_table, i)[APM_DS >> 3].b |= 0x800000;
+                                gdt[APM_DS >> 3].b |= 0x800000;
                                 printk(KERN_NOTICE "apm: we set the granularity of dseg.\n");
                         }
                 }
diff --git a/arch/i386/kernel/cpu/common.c b/arch/i386/kernel/cpu/common.c
index 9ad43be9a01f..74145a33cb0f 100644
--- a/arch/i386/kernel/cpu/common.c
+++ b/arch/i386/kernel/cpu/common.c
@@ -573,6 +573,7 @@ void __devinit cpu_init(void)
         int cpu = smp_processor_id();
         struct tss_struct * t = &per_cpu(init_tss, cpu);
         struct thread_struct *thread = &current->thread;
+        struct desc_struct *gdt = get_cpu_gdt_table(cpu);
         __u32 stk16_off = (__u32)&per_cpu(cpu_16bit_stack, cpu);
 
         if (cpu_test_and_set(cpu, cpu_initialized)) {
@@ -594,24 +595,16 @@ void __devinit cpu_init(void)
          * Initialize the per-CPU GDT with the boot GDT,
          * and set up the GDT descriptor:
          */
-        memcpy(&per_cpu(cpu_gdt_table, cpu), cpu_gdt_table,
-               GDT_SIZE);
+        memcpy(gdt, cpu_gdt_table, GDT_SIZE);
 
         /* Set up GDT entry for 16bit stack */
-        *(__u64 *)&(per_cpu(cpu_gdt_table, cpu)[GDT_ENTRY_ESPFIX_SS]) |=
+        *(__u64 *)(&gdt[GDT_ENTRY_ESPFIX_SS]) |=
                 ((((__u64)stk16_off) << 16) & 0x000000ffffff0000ULL) |
                 ((((__u64)stk16_off) << 32) & 0xff00000000000000ULL) |
                 (CPU_16BIT_STACK_SIZE - 1);
 
         cpu_gdt_descr[cpu].size = GDT_SIZE - 1;
-        cpu_gdt_descr[cpu].address =
-            (unsigned long)&per_cpu(cpu_gdt_table, cpu);
-
-        /*
-         * Set up the per-thread TLS descriptor cache:
-         */
-        memcpy(thread->tls_array, &per_cpu(cpu_gdt_table, cpu),
-                GDT_ENTRY_TLS_ENTRIES * 8);
+        cpu_gdt_descr[cpu].address = (unsigned long)gdt;
 
         load_gdt(&cpu_gdt_descr[cpu]);
         load_idt(&idt_descr);
diff --git a/arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c b/arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c
index 822c8ce9d1f1..caa9f7711343 100644
--- a/arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c
+++ b/arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c
@@ -32,6 +32,7 @@
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <linux/compiler.h>
+#include <linux/sched.h>        /* current */
 #include <asm/io.h>
 #include <asm/delay.h>
 #include <asm/uaccess.h>
diff --git a/arch/i386/kernel/cpu/cpufreq/p4-clockmod.c b/arch/i386/kernel/cpu/cpufreq/p4-clockmod.c
index aa622d52c6e5..270f2188d68b 100644
--- a/arch/i386/kernel/cpu/cpufreq/p4-clockmod.c
+++ b/arch/i386/kernel/cpu/cpufreq/p4-clockmod.c
@@ -28,6 +28,7 @@
 #include <linux/cpufreq.h>
 #include <linux/slab.h>
 #include <linux/cpumask.h>
+#include <linux/sched.h>        /* current / set_cpus_allowed() */
 
 #include <asm/processor.h> 
 #include <asm/msr.h>
diff --git a/arch/i386/kernel/cpu/cpufreq/powernow-k8.c b/arch/i386/kernel/cpu/cpufreq/powernow-k8.c
index 58ca98fdc2ca..2d5c9adba0cd 100644
--- a/arch/i386/kernel/cpu/cpufreq/powernow-k8.c
+++ b/arch/i386/kernel/cpu/cpufreq/powernow-k8.c
@@ -32,6 +32,7 @@
 #include <linux/slab.h>
 #include <linux/string.h>
 #include <linux/cpumask.h>
+#include <linux/sched.h>        /* for current / set_cpus_allowed() */
 
 #include <asm/msr.h>
 #include <asm/io.h>
diff --git a/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c b/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c
index c397b6220430..1465974256c9 100644
--- a/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c
+++ b/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c
@@ -22,6 +22,7 @@
 #include <linux/init.h>
 #include <linux/cpufreq.h>
 #include <linux/config.h>
+#include <linux/sched.h>        /* current */
 #include <linux/delay.h>
 #include <linux/compiler.h>
 
diff --git a/arch/i386/kernel/cpu/intel_cacheinfo.c b/arch/i386/kernel/cpu/intel_cacheinfo.c
index 9e0d5f83cb9f..4dc42a189ae5 100644
--- a/arch/i386/kernel/cpu/intel_cacheinfo.c
+++ b/arch/i386/kernel/cpu/intel_cacheinfo.c
@@ -3,6 +3,7 @@
  *
  *      Changes:
  *      Venkatesh Pallipadi     : Adding cache identification through cpuid(4)
+ *              Ashok Raj <ashok.raj@intel.com>: Work with CPU hotplug infrastructure.
  */
 
 #include <linux/init.h>
@@ -10,6 +11,7 @@
 #include <linux/device.h>
 #include <linux/compiler.h>
 #include <linux/cpu.h>
+#include <linux/sched.h>
 
 #include <asm/processor.h>
 #include <asm/smp.h>
@@ -28,7 +30,7 @@ struct _cache_table
 };
 
 /* all the cache descriptor types we care about (no TLB or trace cache entries) */
-static struct _cache_table cache_table[] __devinitdata =
+static struct _cache_table cache_table[] __cpuinitdata =
 {
         { 0x06, LVL_1_INST, 8 },        /* 4-way set assoc, 32 byte line size */
         { 0x08, LVL_1_INST, 16 },       /* 4-way set assoc, 32 byte line size */
@@ -117,10 +119,9 @@ struct _cpuid4_info {
         cpumask_t shared_cpu_map;
 };
 
-#define MAX_CACHE_LEAVES                4
 static unsigned short                   num_cache_leaves;
 
-static int __devinit cpuid4_cache_lookup(int index, struct _cpuid4_info *this_leaf)
+static int __cpuinit cpuid4_cache_lookup(int index, struct _cpuid4_info *this_leaf)
 {
         unsigned int            eax, ebx, ecx, edx;
         union _cpuid4_leaf_eax  cache_eax;
@@ -144,23 +145,18 @@ static int __init find_num_cache_leaves(void)
 {
         unsigned int            eax, ebx, ecx, edx;
         union _cpuid4_leaf_eax  cache_eax;
-        int                     i;
-        int                     retval;
+        int                     i = -1;
 
-        retval = MAX_CACHE_LEAVES;
-        /* Do cpuid(4) loop to find out num_cache_leaves */
-        for (i = 0; i < MAX_CACHE_LEAVES; i++) {
+        do {
+                ++i;
+                /* Do cpuid(4) loop to find out num_cache_leaves */
                 cpuid_count(4, i, &eax, &ebx, &ecx, &edx);
                 cache_eax.full = eax;
-                if (cache_eax.split.type == CACHE_TYPE_NULL) {
-                        retval = i;
-                        break;
-                }
-        }
-        return retval;
+        } while (cache_eax.split.type != CACHE_TYPE_NULL);
+        return i;
 }
 
-unsigned int __devinit init_intel_cacheinfo(struct cpuinfo_x86 *c)
+unsigned int __cpuinit init_intel_cacheinfo(struct cpuinfo_x86 *c)
 {
         unsigned int trace = 0, l1i = 0, l1d = 0, l2 = 0, l3 = 0; /* Cache sizes */
         unsigned int new_l1d = 0, new_l1i = 0; /* Cache sizes from cpuid(4) */
@@ -284,13 +280,7 @@ unsigned int __devinit init_intel_cacheinfo(struct cpuinfo_x86 *c)
                 if ( l3 )
                         printk(KERN_INFO "CPU: L3 cache: %dK\n", l3);
 
-                /*
-                 * This assumes the L3 cache is shared; it typically lives in
-                 * the northbridge.  The L1 caches are included by the L2
-                 * cache, and so should not be included for the purpose of
-                 * SMP switching weights.
-                 */
-                c->x86_cache_size = l2 ? l2 : (l1i+l1d);
+                c->x86_cache_size = l3 ? l3 : (l2 ? l2 : (l1i+l1d));
         }
 
         return l2;
@@ -301,7 +291,7 @@ static struct _cpuid4_info *cpuid4_info[NR_CPUS];
 #define CPUID4_INFO_IDX(x,y)    (&((cpuid4_info[x])[y]))
 
 #ifdef CONFIG_SMP
-static void __devinit cache_shared_cpu_map_setup(unsigned int cpu, int index)
+static void __cpuinit cache_shared_cpu_map_setup(unsigned int cpu, int index)
 {
         struct _cpuid4_info     *this_leaf;
         unsigned long num_threads_sharing;
@@ -334,7 +324,7 @@ static void free_cache_attributes(unsigned int cpu)
         cpuid4_info[cpu] = NULL;
 }
 
-static int __devinit detect_cache_attributes(unsigned int cpu)
+static int __cpuinit detect_cache_attributes(unsigned int cpu)
 {
         struct _cpuid4_info     *this_leaf;
         unsigned long           j;
@@ -511,7 +501,7 @@ static void cpuid4_cache_sysfs_exit(unsigned int cpu)
         free_cache_attributes(cpu);
 }
 
-static int __devinit cpuid4_cache_sysfs_init(unsigned int cpu)
+static int __cpuinit cpuid4_cache_sysfs_init(unsigned int cpu)
 {
 
         if (num_cache_leaves == 0)
@@ -542,7 +532,7 @@ err_out:
 }
 
 /* Add/Remove cache interface for CPU device */
-static int __devinit cache_add_dev(struct sys_device * sys_dev)
+static int __cpuinit cache_add_dev(struct sys_device * sys_dev)
 {
         unsigned int cpu = sys_dev->id;
         unsigned long i, j;
@@ -579,7 +569,7 @@ static int __devinit cache_add_dev(struct sys_device * sys_dev)
         return retval;
 }
 
-static int __devexit cache_remove_dev(struct sys_device * sys_dev)
+static void __cpuexit cache_remove_dev(struct sys_device * sys_dev)
 {
         unsigned int cpu = sys_dev->id;
         unsigned long i;
@@ -588,24 +578,49 @@ static int __devexit cache_remove_dev(struct sys_device * sys_dev)
                 kobject_unregister(&(INDEX_KOBJECT_PTR(cpu,i)->kobj));
         kobject_unregister(cache_kobject[cpu]);
         cpuid4_cache_sysfs_exit(cpu);
-        return 0;
+        return;
+}
+
+static int __cpuinit cacheinfo_cpu_callback(struct notifier_block *nfb,
+                                        unsigned long action, void *hcpu)
+{
+        unsigned int cpu = (unsigned long)hcpu;
+        struct sys_device *sys_dev;
+
+        sys_dev = get_cpu_sysdev(cpu);
+        switch (action) {
+        case CPU_ONLINE:
+                cache_add_dev(sys_dev);
+                break;
+        case CPU_DEAD:
+                cache_remove_dev(sys_dev);
+                break;
+        }
+        return NOTIFY_OK;
 }
 
-static struct sysdev_driver cache_sysdev_driver = {
-        .add = cache_add_dev,
-        .remove = __devexit_p(cache_remove_dev),
+static struct notifier_block cacheinfo_cpu_notifier =
+{
+    .notifier_call = cacheinfo_cpu_callback,
 };
 
-/* Register/Unregister the cpu_cache driver */
-static int __devinit cache_register_driver(void)
+static int __cpuinit cache_sysfs_init(void)
 {
+        int i;
+
         if (num_cache_leaves == 0)
                 return 0;
 
-        return sysdev_driver_register(&cpu_sysdev_class,&cache_sysdev_driver);
+        register_cpu_notifier(&cacheinfo_cpu_notifier);
+
+        for_each_online_cpu(i) {
+                cacheinfo_cpu_callback(&cacheinfo_cpu_notifier, CPU_ONLINE,
+                        (void *)(long)i);
+        }
+
+        return 0;
 }
 
-device_initcall(cache_register_driver);
+device_initcall(cache_sysfs_init);
 
 #endif
-
diff --git a/arch/i386/kernel/cpu/mcheck/p6.c b/arch/i386/kernel/cpu/mcheck/p6.c
index 3c035b8fa3d9..979b18bc95c1 100644
--- a/arch/i386/kernel/cpu/mcheck/p6.c
+++ b/arch/i386/kernel/cpu/mcheck/p6.c
@@ -102,11 +102,16 @@ void __devinit intel_p6_mcheck_init(struct cpuinfo_x86 *c)
                 wrmsr(MSR_IA32_MCG_CTL, 0xffffffff, 0xffffffff);
         nr_mce_banks = l & 0xff;
 
-        /* Don't enable bank 0 on intel P6 cores, it goes bang quickly. */
-        for (i=1; i<nr_mce_banks; i++) {
+        /*
+         * Following the example in IA-32 SDM Vol 3:
+         * - MC0_CTL should not be written
+         * - Status registers on all banks should be cleared on reset
+         */
+        for (i=1; i<nr_mce_banks; i++)
                 wrmsr (MSR_IA32_MC0_CTL+4*i, 0xffffffff, 0xffffffff);
+
+        for (i=0; i<nr_mce_banks; i++)
                 wrmsr (MSR_IA32_MC0_STATUS+4*i, 0x0, 0x0);
-        }
 
         set_in_cr4 (X86_CR4_MCE);
         printk (KERN_INFO "Intel machine check reporting enabled on CPU#%d.\n",
diff --git a/arch/i386/kernel/cpu/mtrr/if.c b/arch/i386/kernel/cpu/mtrr/if.c
index 1923e0aed26a..cf39e205d33c 100644
--- a/arch/i386/kernel/cpu/mtrr/if.c
+++ b/arch/i386/kernel/cpu/mtrr/if.c
@@ -149,60 +149,89 @@ mtrr_write(struct file *file, const char __user *buf, size_t len, loff_t * ppos)
         return -EINVAL;
 }
 
-static int
-mtrr_ioctl(struct inode *inode, struct file *file,
-           unsigned int cmd, unsigned long __arg)
+static long
+mtrr_ioctl(struct file *file, unsigned int cmd, unsigned long __arg)
 {
-        int err;
+        int err = 0;
         mtrr_type type;
         struct mtrr_sentry sentry;
         struct mtrr_gentry gentry;
         void __user *arg = (void __user *) __arg;
 
         switch (cmd) {
+        case MTRRIOC_ADD_ENTRY:
+        case MTRRIOC_SET_ENTRY:
+        case MTRRIOC_DEL_ENTRY:
+        case MTRRIOC_KILL_ENTRY:
+        case MTRRIOC_ADD_PAGE_ENTRY:
+        case MTRRIOC_SET_PAGE_ENTRY:
+        case MTRRIOC_DEL_PAGE_ENTRY:
+        case MTRRIOC_KILL_PAGE_ENTRY:
+                if (copy_from_user(&sentry, arg, sizeof sentry))
+                        return -EFAULT;
+                break;
+        case MTRRIOC_GET_ENTRY:
+        case MTRRIOC_GET_PAGE_ENTRY:
+                if (copy_from_user(&gentry, arg, sizeof gentry))
+                        return -EFAULT;
+                break;
+#ifdef CONFIG_COMPAT
+        case MTRRIOC32_ADD_ENTRY:
+        case MTRRIOC32_SET_ENTRY:
+        case MTRRIOC32_DEL_ENTRY:
+        case MTRRIOC32_KILL_ENTRY:
+        case MTRRIOC32_ADD_PAGE_ENTRY:
+        case MTRRIOC32_SET_PAGE_ENTRY:
+        case MTRRIOC32_DEL_PAGE_ENTRY:
+        case MTRRIOC32_KILL_PAGE_ENTRY: {
+                struct mtrr_sentry32 __user *s32 = (struct mtrr_sentry32 __user *)__arg;
+                err = get_user(sentry.base, &s32->base);
+                err |= get_user(sentry.size, &s32->size);
+                err |= get_user(sentry.type, &s32->type);
+                if (err)
+                        return err;
+                break;
+        }
+        case MTRRIOC32_GET_ENTRY:
+        case MTRRIOC32_GET_PAGE_ENTRY: {
+                struct mtrr_gentry32 __user *g32 = (struct mtrr_gentry32 __user *)__arg;
+                err = get_user(gentry.regnum, &g32->regnum);
+                err |= get_user(gentry.base, &g32->base);
+                err |= get_user(gentry.size, &g32->size);
+                err |= get_user(gentry.type, &g32->type);
+                if (err)
+                        return err;
+                break;
+        }
+#endif
+        }
+
+        switch (cmd) {
         default:
                 return -ENOTTY;
         case MTRRIOC_ADD_ENTRY:
                 if (!capable(CAP_SYS_ADMIN))
                         return -EPERM;
-                if (copy_from_user(&sentry, arg, sizeof sentry))
-                        return -EFAULT;
                 err =
                     mtrr_file_add(sentry.base, sentry.size, sentry.type, 1,
                                   file, 0);
-                if (err < 0)
-                        return err;
                 break;
         case MTRRIOC_SET_ENTRY:
                 if (!capable(CAP_SYS_ADMIN))
                         return -EPERM;
-                if (copy_from_user(&sentry, arg, sizeof sentry))
-                        return -EFAULT;
                 err = mtrr_add(sentry.base, sentry.size, sentry.type, 0);
-                if (err < 0)
-                        return err;
                 break;
         case MTRRIOC_DEL_ENTRY:
                 if (!capable(CAP_SYS_ADMIN))
                         return -EPERM;
-                if (copy_from_user(&sentry, arg, sizeof sentry))
-                        return -EFAULT;
                 err = mtrr_file_del(sentry.base, sentry.size, file, 0);
-                if (err < 0)
-                        return err;
                 break;
         case MTRRIOC_KILL_ENTRY:
                 if (!capable(CAP_SYS_ADMIN))
                         return -EPERM;
-                if (copy_from_user(&sentry, arg, sizeof sentry))
-                        return -EFAULT;
                 err = mtrr_del(-1, sentry.base, sentry.size);
-                if (err < 0)
-                        return err;
                 break;
         case MTRRIOC_GET_ENTRY:
-                if (copy_from_user(&gentry, arg, sizeof gentry))
-                        return -EFAULT;
                 if (gentry.regnum >= num_var_ranges)
                         return -EINVAL;
                 mtrr_if->get(gentry.regnum, &gentry.base, &gentry.size, &type);
@@ -217,60 +246,59 @@ mtrr_ioctl(struct inode *inode, struct file *file,
                         gentry.type = type;
                 }
 
-                if (copy_to_user(arg, &gentry, sizeof gentry))
-                        return -EFAULT;
                 break;
         case MTRRIOC_ADD_PAGE_ENTRY:
                 if (!capable(CAP_SYS_ADMIN))
                         return -EPERM;
-                if (copy_from_user(&sentry, arg, sizeof sentry))
-                        return -EFAULT;
                 err =
                     mtrr_file_add(sentry.base, sentry.size, sentry.type, 1,
                                   file, 1);
-                if (err < 0)
-                        return err;
                 break;
         case MTRRIOC_SET_PAGE_ENTRY:
                 if (!capable(CAP_SYS_ADMIN))
                         return -EPERM;
-                if (copy_from_user(&sentry, arg, sizeof sentry))
-                        return -EFAULT;
                 err = mtrr_add_page(sentry.base, sentry.size, sentry.type, 0);
-                if (err < 0)
-                        return err;
                 break;
         case MTRRIOC_DEL_PAGE_ENTRY:
                 if (!capable(CAP_SYS_ADMIN))
                         return -EPERM;
-                if (copy_from_user(&sentry, arg, sizeof sentry))
-                        return -EFAULT;
                 err = mtrr_file_del(sentry.base, sentry.size, file, 1);
-                if (err < 0)
-                        return err;
                 break;
         case MTRRIOC_KILL_PAGE_ENTRY:
                 if (!capable(CAP_SYS_ADMIN))
                         return -EPERM;
-                if (copy_from_user(&sentry, arg, sizeof sentry))
-                        return -EFAULT;
                 err = mtrr_del_page(-1, sentry.base, sentry.size);
-                if (err < 0)
-                        return err;
                 break;
         case MTRRIOC_GET_PAGE_ENTRY:
-                if (copy_from_user(&gentry, arg, sizeof gentry))
-                        return -EFAULT;
                 if (gentry.regnum >= num_var_ranges)
                         return -EINVAL;
                 mtrr_if->get(gentry.regnum, &gentry.base, &gentry.size, &type);
                 gentry.type = type;
+                break;
+        }
+
+        if (err)
+                return err;
 
+        switch(cmd) {
+        case MTRRIOC_GET_ENTRY:
+        case MTRRIOC_GET_PAGE_ENTRY:
                 if (copy_to_user(arg, &gentry, sizeof gentry))
-                        return -EFAULT;
+                        err = -EFAULT;
+                break;
+#ifdef CONFIG_COMPAT
+        case MTRRIOC32_GET_ENTRY:
+        case MTRRIOC32_GET_PAGE_ENTRY: {
+                struct mtrr_gentry32 __user *g32 = (struct mtrr_gentry32 __user *)__arg;
+                err = put_user(gentry.base, &g32->base);
+                err |= put_user(gentry.size, &g32->size);
+                err |= put_user(gentry.regnum, &g32->regnum);
+                err |= put_user(gentry.type, &g32->type);
                 break;
         }
-        return 0;
+#endif
+        }
+        return err;
 }
 
 static int
@@ -310,7 +338,8 @@ static struct file_operations mtrr_fops = {
         .read    = seq_read,
         .llseek  = seq_lseek,
         .write   = mtrr_write,
-        .ioctl   = mtrr_ioctl,
+        .unlocked_ioctl = mtrr_ioctl,
+        .compat_ioctl = mtrr_ioctl,
         .release = mtrr_close,
 };
 
diff --git a/arch/i386/kernel/cpu/proc.c b/arch/i386/kernel/cpu/proc.c
index 8bd77d948a84..41b871ecf4b3 100644
--- a/arch/i386/kernel/cpu/proc.c
+++ b/arch/i386/kernel/cpu/proc.c
@@ -44,7 +44,7 @@ static int show_cpuinfo(struct seq_file *m, void *v)
                 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
 
                 /* Intel-defined (#2) */
-                "pni", NULL, NULL, "monitor", "ds_cpl", NULL, NULL, "est",
+                "pni", NULL, NULL, "monitor", "ds_cpl", "vmx", NULL, "est",
                 "tm2", NULL, "cid", NULL, NULL, "cx16", "xtpr", NULL,
                 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
                 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
diff --git a/arch/i386/kernel/cpuid.c b/arch/i386/kernel/cpuid.c
index 4647db4ad6de..13bae799e626 100644
--- a/arch/i386/kernel/cpuid.c
+++ b/arch/i386/kernel/cpuid.c
@@ -163,7 +163,7 @@ static int cpuid_class_device_create(int i)
         int err = 0;
         struct class_device *class_err;
 
-        class_err = class_device_create(cpuid_class, MKDEV(CPUID_MAJOR, i), NULL, "cpu%d",i);
+        class_err = class_device_create(cpuid_class, NULL, MKDEV(CPUID_MAJOR, i), NULL, "cpu%d",i);
         if (IS_ERR(class_err))
                 err = PTR_ERR(class_err);
         return err;
diff --git a/arch/i386/kernel/crash.c b/arch/i386/kernel/crash.c
index 0248e084017c..af809ccf5fbe 100644
--- a/arch/i386/kernel/crash.c
+++ b/arch/i386/kernel/crash.c
@@ -21,7 +21,6 @@
 #include <asm/hardirq.h>
 #include <asm/nmi.h>
 #include <asm/hw_irq.h>
-#include <asm/apic.h>
 #include <mach_ipi.h>
 
 
@@ -148,7 +147,6 @@ static int crash_nmi_callback(struct pt_regs *regs, int cpu)
                 regs = &fixed_regs;
         }
         crash_save_this_cpu(regs, cpu);
-        disable_local_APIC();
         atomic_dec(&waiting_for_crash_ipi);
         /* Assume hlt works */
         halt();
@@ -188,7 +186,6 @@ static void nmi_shootdown_cpus(void)
         }
 
         /* Leave the nmi callback set */
-        disable_local_APIC();
 }
 #else
 static void nmi_shootdown_cpus(void)
@@ -213,9 +210,5 @@ void machine_crash_shutdown(struct pt_regs *regs)
         /* Make a note of crashing cpu. Will be used in NMI callback.*/
         crashing_cpu = smp_processor_id();
         nmi_shootdown_cpus();
-        lapic_shutdown();
-#if defined(CONFIG_X86_IO_APIC)
-        disable_IO_APIC();
-#endif
         crash_save_self(regs);
 }
diff --git a/arch/i386/kernel/i8259.c b/arch/i386/kernel/i8259.c
index 323ef8ab3244..d86f24909284 100644
--- a/arch/i386/kernel/i8259.c
+++ b/arch/i386/kernel/i8259.c
@@ -435,4 +435,8 @@ void __init init_IRQ(void)
                 setup_irq(FPU_IRQ, &fpu_irq);
 
         irq_ctx_init(smp_processor_id());
+
+#ifdef CONFIG_X86_LOCAL_APIC
+        APIC_init();
+#endif
 }
diff --git a/arch/i386/kernel/io_apic.c b/arch/i386/kernel/io_apic.c
index fb3991e8229e..5a77c52b20a9 100644
--- a/arch/i386/kernel/io_apic.c
+++ b/arch/i386/kernel/io_apic.c
@@ -46,6 +46,9 @@
 int (*ioapic_renumber_irq)(int ioapic, int irq);
 atomic_t irq_mis_count;
 
+/* Where if anywhere is the i8259 connect in external int mode */
+static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
+
 static DEFINE_SPINLOCK(ioapic_lock);
 
 /*
@@ -738,7 +741,7 @@ static int find_irq_entry(int apic, int pin, int type)
 /*
  * Find the pin to which IRQ[irq] (ISA) is connected
  */
-static int find_isa_irq_pin(int irq, int type)
+static int __init find_isa_irq_pin(int irq, int type)
 {
         int i;
 
@@ -758,6 +761,33 @@ static int find_isa_irq_pin(int irq, int type)
         return -1;
 }
 
+static int __init find_isa_irq_apic(int irq, int type)
+{
+        int i;
+
+        for (i = 0; i < mp_irq_entries; i++) {
+                int lbus = mp_irqs[i].mpc_srcbus;
+
+                if ((mp_bus_id_to_type[lbus] == MP_BUS_ISA ||
+                     mp_bus_id_to_type[lbus] == MP_BUS_EISA ||
+                     mp_bus_id_to_type[lbus] == MP_BUS_MCA ||
+                     mp_bus_id_to_type[lbus] == MP_BUS_NEC98
+                    ) &&
+                    (mp_irqs[i].mpc_irqtype == type) &&
+                    (mp_irqs[i].mpc_srcbusirq == irq))
+                        break;
+        }
+        if (i < mp_irq_entries) {
+                int apic;
+                for(apic = 0; apic < nr_ioapics; apic++) {
+                        if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic)
+                                return apic;
+                }
+        }
+
+        return -1;
+}
+
 /*
  * Find a specific PCI IRQ entry.
  * Not an __init, possibly needed by modules
@@ -1253,7 +1283,7 @@ static void __init setup_IO_APIC_irqs(void)
 /*
  * Set up the 8259A-master output pin:
  */
-static void __init setup_ExtINT_IRQ0_pin(unsigned int pin, int vector)
+static void __init setup_ExtINT_IRQ0_pin(unsigned int apic, unsigned int pin, int vector)
 {
         struct IO_APIC_route_entry entry;
         unsigned long flags;
@@ -1287,8 +1317,8 @@ static void __init setup_ExtINT_IRQ0_pin(unsigned int pin, int vector)
          * Add it to the IO-APIC irq-routing table:
          */
         spin_lock_irqsave(&ioapic_lock, flags);
-        io_apic_write(0, 0x11+2*pin, *(((int *)&entry)+1));
-        io_apic_write(0, 0x10+2*pin, *(((int *)&entry)+0));
+        io_apic_write(apic, 0x11+2*pin, *(((int *)&entry)+1));
+        io_apic_write(apic, 0x10+2*pin, *(((int *)&entry)+0));
         spin_unlock_irqrestore(&ioapic_lock, flags);
 
         enable_8259A_irq(0);
@@ -1595,7 +1625,8 @@ void /*__init*/ print_PIC(void)
 static void __init enable_IO_APIC(void)
 {
         union IO_APIC_reg_01 reg_01;
-        int i;
+        int i8259_apic, i8259_pin;
+        int i, apic;
         unsigned long flags;
 
         for (i = 0; i < PIN_MAP_SIZE; i++) {
@@ -1609,11 +1640,52 @@ static void __init enable_IO_APIC(void)
         /*
          * The number of IO-APIC IRQ registers (== #pins):
          */
-        for (i = 0; i < nr_ioapics; i++) {
+        for (apic = 0; apic < nr_ioapics; apic++) {
                 spin_lock_irqsave(&ioapic_lock, flags);
-                reg_01.raw = io_apic_read(i, 1);
+                reg_01.raw = io_apic_read(apic, 1);
                 spin_unlock_irqrestore(&ioapic_lock, flags);
-                nr_ioapic_registers[i] = reg_01.bits.entries+1;
+                nr_ioapic_registers[apic] = reg_01.bits.entries+1;
+        }
+        for(apic = 0; apic < nr_ioapics; apic++) {
+                int pin;
+                /* See if any of the pins is in ExtINT mode */
+                for(pin = 0; pin < nr_ioapic_registers[i]; pin++) {
+                        struct IO_APIC_route_entry entry;
+                        spin_lock_irqsave(&ioapic_lock, flags);
+                        *(((int *)&entry) + 0) = io_apic_read(apic, 0x10 + 2 * pin);
+                        *(((int *)&entry) + 1) = io_apic_read(apic, 0x11 + 2 * pin);
+                        spin_unlock_irqrestore(&ioapic_lock, flags);
+
+
+                        /* If the interrupt line is enabled and in ExtInt mode
+                         * I have found the pin where the i8259 is connected.
+                         */
+                        if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) {
+                                ioapic_i8259.apic = apic;
+                                ioapic_i8259.pin  = pin;
+                                goto found_i8259;
+                        }
+                }
+        }
+ found_i8259:
+        /* Look to see what if the MP table has reported the ExtINT */
+        /* If we could not find the appropriate pin by looking at the ioapic
+         * the i8259 probably is not connected the ioapic but give the
+         * mptable a chance anyway.
+         */
+        i8259_pin  = find_isa_irq_pin(0, mp_ExtINT);
+        i8259_apic = find_isa_irq_apic(0, mp_ExtINT);
+        /* Trust the MP table if nothing is setup in the hardware */
+        if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) {
+                printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n");
+                ioapic_i8259.pin  = i8259_pin;
+                ioapic_i8259.apic = i8259_apic;
+        }
+        /* Complain if the MP table and the hardware disagree */
+        if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) &&
+                (i8259_pin >= 0) && (ioapic_i8259.pin >= 0))
+        {
+                printk(KERN_WARNING "ExtINT in hardware and MP table differ\n");
         }
 
         /*
@@ -1627,7 +1699,6 @@ static void __init enable_IO_APIC(void)
  */
 void disable_IO_APIC(void)
 {
-        int pin;
         /*
          * Clear the IO-APIC before rebooting:
          */
@@ -1638,8 +1709,7 @@ void disable_IO_APIC(void)
          * Put that IOAPIC in virtual wire mode
          * so legacy interrupts can be delivered.
          */
-        pin = find_isa_irq_pin(0, mp_ExtINT);
-        if (pin != -1) {
+        if (ioapic_i8259.pin != -1) {
                 struct IO_APIC_route_entry entry;
                 unsigned long flags;
 
@@ -1650,7 +1720,7 @@ void disable_IO_APIC(void)
                 entry.polarity        = 0; /* High */
                 entry.delivery_status = 0;
                 entry.dest_mode       = 0; /* Physical */
-                entry.delivery_mode   = 7; /* ExtInt */
+                entry.delivery_mode   = dest_ExtINT; /* ExtInt */
                 entry.vector          = 0;
                 entry.dest.physical.physical_dest = 0;
 
@@ -1659,11 +1729,13 @@ void disable_IO_APIC(void)
                  * Add it to the IO-APIC irq-routing table:
                  */
                 spin_lock_irqsave(&ioapic_lock, flags);
-                io_apic_write(0, 0x11+2*pin, *(((int *)&entry)+1));
-                io_apic_write(0, 0x10+2*pin, *(((int *)&entry)+0));
+                io_apic_write(ioapic_i8259.apic, 0x11+2*ioapic_i8259.pin,
+                        *(((int *)&entry)+1));
+                io_apic_write(ioapic_i8259.apic, 0x10+2*ioapic_i8259.pin,
+                        *(((int *)&entry)+0));
                 spin_unlock_irqrestore(&ioapic_lock, flags);
         }
-        disconnect_bsp_APIC(pin != -1);
+        disconnect_bsp_APIC(ioapic_i8259.pin != -1);
 }
 
 /*
@@ -2113,20 +2185,21 @@ static void setup_nmi (void)
  */
 static inline void unlock_ExtINT_logic(void)
 {
-        int pin, i;
+        int apic, pin, i;
         struct IO_APIC_route_entry entry0, entry1;
         unsigned char save_control, save_freq_select;
         unsigned long flags;
 
-        pin = find_isa_irq_pin(8, mp_INT);
+        pin  = find_isa_irq_pin(8, mp_INT);
+        apic = find_isa_irq_apic(8, mp_INT);
         if (pin == -1)
                 return;
 
         spin_lock_irqsave(&ioapic_lock, flags);
-        *(((int *)&entry0) + 1) = io_apic_read(0, 0x11 + 2 * pin);
-        *(((int *)&entry0) + 0) = io_apic_read(0, 0x10 + 2 * pin);
+        *(((int *)&entry0) + 1) = io_apic_read(apic, 0x11 + 2 * pin);
+        *(((int *)&entry0) + 0) = io_apic_read(apic, 0x10 + 2 * pin);
         spin_unlock_irqrestore(&ioapic_lock, flags);
-        clear_IO_APIC_pin(0, pin);
+        clear_IO_APIC_pin(apic, pin);
 
         memset(&entry1, 0, sizeof(entry1));
 
@@ -2139,8 +2212,8 @@ static inline void unlock_ExtINT_logic(void)
         entry1.vector = 0;
 
         spin_lock_irqsave(&ioapic_lock, flags);
-        io_apic_write(0, 0x11 + 2 * pin, *(((int *)&entry1) + 1));
-        io_apic_write(0, 0x10 + 2 * pin, *(((int *)&entry1) + 0));
+        io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry1) + 1));
+        io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry1) + 0));
         spin_unlock_irqrestore(&ioapic_lock, flags);
 
         save_control = CMOS_READ(RTC_CONTROL);
@@ -2158,11 +2231,11 @@ static inline void unlock_ExtINT_logic(void)
 
         CMOS_WRITE(save_control, RTC_CONTROL);
         CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
-        clear_IO_APIC_pin(0, pin);
+        clear_IO_APIC_pin(apic, pin);
 
         spin_lock_irqsave(&ioapic_lock, flags);
-        io_apic_write(0, 0x11 + 2 * pin, *(((int *)&entry0) + 1));
-        io_apic_write(0, 0x10 + 2 * pin, *(((int *)&entry0) + 0));
+        io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry0) + 1));
+        io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry0) + 0));
         spin_unlock_irqrestore(&ioapic_lock, flags);
 }
 
@@ -2174,7 +2247,7 @@ static inline void unlock_ExtINT_logic(void)
  */
 static inline void check_timer(void)
 {
-        int pin1, pin2;
+        int apic1, pin1, apic2, pin2;
         int vector;
 
         /*
@@ -2196,10 +2269,13 @@ static inline void check_timer(void)
         timer_ack = 1;
         enable_8259A_irq(0);
 
-        pin1 = find_isa_irq_pin(0, mp_INT);
-        pin2 = find_isa_irq_pin(0, mp_ExtINT);
+        pin1  = find_isa_irq_pin(0, mp_INT);
+        apic1 = find_isa_irq_apic(0, mp_INT);
+        pin2  = ioapic_i8259.pin;
+        apic2 = ioapic_i8259.apic;
 
-        printk(KERN_INFO "..TIMER: vector=0x%02X pin1=%d pin2=%d\n", vector, pin1, pin2);
+        printk(KERN_INFO "..TIMER: vector=0x%02X apic1=%d pin1=%d apic2=%d pin2=%d\n",
+                vector, apic1, pin1, apic2, pin2);
 
         if (pin1 != -1) {
                 /*
@@ -2216,8 +2292,9 @@ static inline void check_timer(void)
                                 clear_IO_APIC_pin(0, pin1);
                         return;
                 }
-                clear_IO_APIC_pin(0, pin1);
-                printk(KERN_ERR "..MP-BIOS bug: 8254 timer not connected to IO-APIC\n");
+                clear_IO_APIC_pin(apic1, pin1);
+                printk(KERN_ERR "..MP-BIOS bug: 8254 timer not connected to "
+                                "IO-APIC\n");
         }
 
         printk(KERN_INFO "...trying to set up timer (IRQ0) through the 8259A ... ");
@@ -2226,13 +2303,13 @@ static inline void check_timer(void)
                 /*
                  * legacy devices should be connected to IO APIC #0
                  */
-                setup_ExtINT_IRQ0_pin(pin2, vector);
+                setup_ExtINT_IRQ0_pin(apic2, pin2, vector);
                 if (timer_irq_works()) {
                         printk("works.\n");
                         if (pin1 != -1)
-                                replace_pin_at_irq(0, 0, pin1, 0, pin2);
+                                replace_pin_at_irq(0, apic1, pin1, apic2, pin2);
                         else
-                                add_pin_to_irq(0, 0, pin2);
+                                add_pin_to_irq(0, apic2, pin2);
                         if (nmi_watchdog == NMI_IO_APIC) {
                                 setup_nmi();
                         }
@@ -2241,7 +2318,7 @@ static inline void check_timer(void)
                 /*
                  * Cleanup, just in case ...
                  */
-                clear_IO_APIC_pin(0, pin2);
+                clear_IO_APIC_pin(apic2, pin2);
         }
         printk(" failed.\n");
 
@@ -2310,11 +2387,15 @@ void __init setup_IO_APIC(void)
         sync_Arb_IDs();
         setup_IO_APIC_irqs();
         init_IO_APIC_traps();
-        check_timer();
         if (!acpi_ioapic)
                 print_IO_APIC();
 }
 
+void __init IO_APIC_late_time_init(void)
+{
+        check_timer();
+}
+
 /*
  *      Called after all the initialization is done. If we didnt find any
  *      APIC bugs then we can allow the modify fast path
diff --git a/arch/i386/kernel/irq.c b/arch/i386/kernel/irq.c
index ce66dcc26d90..1a201a932865 100644
--- a/arch/i386/kernel/irq.c
+++ b/arch/i386/kernel/irq.c
@@ -218,7 +218,7 @@ int show_interrupts(struct seq_file *p, void *v)
 
         if (i == 0) {
                 seq_printf(p, "           ");
-                for_each_cpu(j)
+                for_each_online_cpu(j)
                         seq_printf(p, "CPU%d       ",j);
                 seq_putc(p, '\n');
         }
@@ -232,7 +232,7 @@ int show_interrupts(struct seq_file *p, void *v)
 #ifndef CONFIG_SMP
                 seq_printf(p, "%10u ", kstat_irqs(i));
 #else
-                for_each_cpu(j)
+                for_each_online_cpu(j)
                         seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
 #endif
                 seq_printf(p, " %14s", irq_desc[i].handler->typename);
@@ -246,12 +246,12 @@ skip:
                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
         } else if (i == NR_IRQS) {
                 seq_printf(p, "NMI: ");
-                for_each_cpu(j)
+                for_each_online_cpu(j)
                         seq_printf(p, "%10u ", nmi_count(j));
                 seq_putc(p, '\n');
 #ifdef CONFIG_X86_LOCAL_APIC
                 seq_printf(p, "LOC: ");
-                for_each_cpu(j)
+                for_each_online_cpu(j)
                         seq_printf(p, "%10u ",
                                 per_cpu(irq_stat,j).apic_timer_irqs);
                 seq_putc(p, '\n');
diff --git a/arch/i386/kernel/mpparse.c b/arch/i386/kernel/mpparse.c
index 27aabfceb67e..8f767d9aa45d 100644
--- a/arch/i386/kernel/mpparse.c
+++ b/arch/i386/kernel/mpparse.c
@@ -69,7 +69,7 @@ unsigned int def_to_bigsmp = 0;
 /* Processor that is doing the boot up */
 unsigned int boot_cpu_physical_apicid = -1U;
 /* Internal processor count */
-static unsigned int __initdata num_processors;
+static unsigned int __devinitdata num_processors;
 
 /* Bitmask of physically existing CPUs */
 physid_mask_t phys_cpu_present_map;
@@ -119,7 +119,7 @@ static int MP_valid_apicid(int apicid, int version)
 }
 #endif
 
-static void __init MP_processor_info (struct mpc_config_processor *m)
+static void __devinit MP_processor_info (struct mpc_config_processor *m)
 {
         int ver, apicid;
         physid_mask_t phys_cpu;
@@ -182,17 +182,6 @@ static void __init MP_processor_info (struct mpc_config_processor *m)
                 boot_cpu_physical_apicid = m->mpc_apicid;
         }
 
-        if (num_processors >= NR_CPUS) {
-                printk(KERN_WARNING "WARNING: NR_CPUS limit of %i reached."
-                        "  Processor ignored.\n", NR_CPUS); 
-                return;
-        }
-
-        if (num_processors >= maxcpus) {
-                printk(KERN_WARNING "WARNING: maxcpus limit of %i reached."
-                        " Processor ignored.\n", maxcpus); 
-                return;
-        }
         ver = m->mpc_apicver;
 
         if (!MP_valid_apicid(apicid, ver)) {
@@ -201,11 +190,6 @@ static void __init MP_processor_info (struct mpc_config_processor *m)
                 return;
         }
 
-        cpu_set(num_processors, cpu_possible_map);
-        num_processors++;
-        phys_cpu = apicid_to_cpu_present(apicid);
-        physids_or(phys_cpu_present_map, phys_cpu_present_map, phys_cpu);
-
         /*
          * Validate version
          */
@@ -216,6 +200,25 @@ static void __init MP_processor_info (struct mpc_config_processor *m)
                 ver = 0x10;
         }
         apic_version[m->mpc_apicid] = ver;
+
+        phys_cpu = apicid_to_cpu_present(apicid);
+        physids_or(phys_cpu_present_map, phys_cpu_present_map, phys_cpu);
+
+        if (num_processors >= NR_CPUS) {
+                printk(KERN_WARNING "WARNING: NR_CPUS limit of %i reached."
+                        "  Processor ignored.\n", NR_CPUS);
+                return;
+        }
+
+        if (num_processors >= maxcpus) {
+                printk(KERN_WARNING "WARNING: maxcpus limit of %i reached."
+                        " Processor ignored.\n", maxcpus);
+                return;
+        }
+
+        cpu_set(num_processors, cpu_possible_map);
+        num_processors++;
+
         if ((num_processors > 8) &&
             APIC_XAPIC(ver) &&
             (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL))
@@ -834,7 +837,7 @@ void __init mp_register_lapic_address (
 }
 
 
-void __init mp_register_lapic (
+void __devinit mp_register_lapic (
         u8                      id, 
         u8                      enabled)
 {
diff --git a/arch/i386/kernel/msr.c b/arch/i386/kernel/msr.c
index 03100d6fc5d6..44470fea4309 100644
--- a/arch/i386/kernel/msr.c
+++ b/arch/i386/kernel/msr.c
@@ -246,7 +246,7 @@ static int msr_class_device_create(int i)
         int err = 0;
         struct class_device *class_err;
 
-        class_err = class_device_create(msr_class, MKDEV(MSR_MAJOR, i), NULL, "msr%d",i);
+        class_err = class_device_create(msr_class, NULL, MKDEV(MSR_MAJOR, i), NULL, "msr%d",i);
         if (IS_ERR(class_err)) 
                 err = PTR_ERR(class_err);
         return err;
diff --git a/arch/i386/kernel/nmi.c b/arch/i386/kernel/nmi.c
index 72515b8a1b12..d661703ac1cb 100644
--- a/arch/i386/kernel/nmi.c
+++ b/arch/i386/kernel/nmi.c
@@ -100,16 +100,44 @@ int nmi_active;
         (P4_CCCR_OVF_PMI0|P4_CCCR_THRESHOLD(15)|P4_CCCR_COMPLEMENT|     \
          P4_CCCR_COMPARE|P4_CCCR_REQUIRED|P4_CCCR_ESCR_SELECT(4)|P4_CCCR_ENABLE)
 
+#ifdef CONFIG_SMP
+/* The performance counters used by NMI_LOCAL_APIC don't trigger when
+ * the CPU is idle. To make sure the NMI watchdog really ticks on all
+ * CPUs during the test make them busy.
+ */
+static __init void nmi_cpu_busy(void *data)
+{
+        volatile int *endflag = data;
+        local_irq_enable();
+        /* Intentionally don't use cpu_relax here. This is
+           to make sure that the performance counter really ticks,
+           even if there is a simulator or similar that catches the
+           pause instruction. On a real HT machine this is fine because
+           all other CPUs are busy with "useless" delay loops and don't
+           care if they get somewhat less cycles. */
+        while (*endflag == 0)
+                barrier();
+}
+#endif
+
 static int __init check_nmi_watchdog(void)
 {
-        unsigned int prev_nmi_count[NR_CPUS];
+        volatile int endflag = 0;
+        unsigned int *prev_nmi_count;
         int cpu;
 
         if (nmi_watchdog == NMI_NONE)
                 return 0;
 
+        prev_nmi_count = kmalloc(NR_CPUS * sizeof(int), GFP_KERNEL);
+        if (!prev_nmi_count)
+                return -1;
+
         printk(KERN_INFO "Testing NMI watchdog ... ");
 
+        if (nmi_watchdog == NMI_LOCAL_APIC)
+                smp_call_function(nmi_cpu_busy, (void *)&endflag, 0, 0);
+
         for (cpu = 0; cpu < NR_CPUS; cpu++)
                 prev_nmi_count[cpu] = per_cpu(irq_stat, cpu).__nmi_count;
         local_irq_enable();
@@ -123,12 +151,18 @@ static int __init check_nmi_watchdog(void)
                         continue;
 #endif
                 if (nmi_count(cpu) - prev_nmi_count[cpu] <= 5) {
-                        printk("CPU#%d: NMI appears to be stuck!\n", cpu);
+                        endflag = 1;
+                        printk("CPU#%d: NMI appears to be stuck (%d->%d)!\n",
+                                cpu,
+                                prev_nmi_count[cpu],
+                                nmi_count(cpu));
                         nmi_active = 0;
                         lapic_nmi_owner &= ~LAPIC_NMI_WATCHDOG;
+                        kfree(prev_nmi_count);
                         return -1;
                 }
         }
+        endflag = 1;
         printk("OK.\n");
 
         /* now that we know it works we can reduce NMI frequency to
@@ -136,6 +170,7 @@ static int __init check_nmi_watchdog(void)
         if (nmi_watchdog == NMI_LOCAL_APIC)
                 nmi_hz = 1;
 
+        kfree(prev_nmi_count);
         return 0;
 }
 /* This needs to happen later in boot so counters are working */
diff --git a/arch/i386/kernel/ptrace.c b/arch/i386/kernel/ptrace.c
index 7b6368bf8974..efd11f09c996 100644
--- a/arch/i386/kernel/ptrace.c
+++ b/arch/i386/kernel/ptrace.c
@@ -354,7 +354,7 @@ ptrace_set_thread_area(struct task_struct *child,
         return 0;
 }
 
-asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
+asmlinkage long sys_ptrace(long request, long pid, long addr, long data)
 {
         struct task_struct *child;
         struct user * dummy = NULL;
diff --git a/arch/i386/kernel/reboot_fixups.c b/arch/i386/kernel/reboot_fixups.c
index 1b183b378c2c..c9b87330aeea 100644
--- a/arch/i386/kernel/reboot_fixups.c
+++ b/arch/i386/kernel/reboot_fixups.c
@@ -44,7 +44,7 @@ void mach_reboot_fixups(void)
 
         for (i=0; i < (sizeof(fixups_table)/sizeof(fixups_table[0])); i++) {
                 cur = &(fixups_table[i]);
-                dev = pci_get_device(cur->vendor, cur->device, 0);
+                dev = pci_get_device(cur->vendor, cur->device, NULL);
                 if (!dev)
                         continue;
 
diff --git a/arch/i386/kernel/setup.c b/arch/i386/kernel/setup.c
index 9b8c8a19824d..b48ac635f3c1 100644
--- a/arch/i386/kernel/setup.c
+++ b/arch/i386/kernel/setup.c
@@ -389,14 +389,24 @@ static void __init limit_regions(unsigned long long size)
                 }
         }
         for (i = 0; i < e820.nr_map; i++) {
-                if (e820.map[i].type == E820_RAM) {
-                        current_addr = e820.map[i].addr + e820.map[i].size;
-                        if (current_addr >= size) {
-                                e820.map[i].size -= current_addr-size;
-                                e820.nr_map = i + 1;
-                                return;
-                        }
+                current_addr = e820.map[i].addr + e820.map[i].size;
+                if (current_addr < size)
+                        continue;
+
+                if (e820.map[i].type != E820_RAM)
+                        continue;
+
+                if (e820.map[i].addr >= size) {
+                        /*
+                         * This region starts past the end of the
+                         * requested size, skip it completely.
+                         */
+                        e820.nr_map = i;
+                } else {
+                        e820.nr_map = i + 1;
+                        e820.map[i].size -= current_addr - size;
                 }
+                return;
         }
 }
 
diff --git a/arch/i386/kernel/smpboot.c b/arch/i386/kernel/smpboot.c
index 1fb26d0e30b6..5a2bbe0c4fff 100644
--- a/arch/i386/kernel/smpboot.c
+++ b/arch/i386/kernel/smpboot.c
@@ -87,7 +87,11 @@ EXPORT_SYMBOL(cpu_online_map);
 cpumask_t cpu_callin_map;
 cpumask_t cpu_callout_map;
 EXPORT_SYMBOL(cpu_callout_map);
+#ifdef CONFIG_HOTPLUG_CPU
+cpumask_t cpu_possible_map = CPU_MASK_ALL;
+#else
 cpumask_t cpu_possible_map;
+#endif
 EXPORT_SYMBOL(cpu_possible_map);
 static cpumask_t smp_commenced_mask;
 
@@ -1074,6 +1078,16 @@ void *xquad_portio;
 EXPORT_SYMBOL(xquad_portio);
 #endif
 
+/*
+ * Fall back to non SMP mode after errors.
+ *
+ */
+static __init void disable_smp(void)
+{
+        cpu_set(0, cpu_sibling_map[0]);
+        cpu_set(0, cpu_core_map[0]);
+}
+
 static void __init smp_boot_cpus(unsigned int max_cpus)
 {
         int apicid, cpu, bit, kicked;
@@ -1086,7 +1100,6 @@ static void __init smp_boot_cpus(unsigned int max_cpus)
         printk("CPU%d: ", 0);
         print_cpu_info(&cpu_data[0]);
 
-        boot_cpu_physical_apicid = GET_APIC_ID(apic_read(APIC_ID));
         boot_cpu_logical_apicid = logical_smp_processor_id();
         x86_cpu_to_apicid[0] = boot_cpu_physical_apicid;
 
@@ -1098,68 +1111,27 @@ static void __init smp_boot_cpus(unsigned int max_cpus)
         cpus_clear(cpu_core_map[0]);
         cpu_set(0, cpu_core_map[0]);
 
+        map_cpu_to_logical_apicid();
+
         /*
          * If we couldn't find an SMP configuration at boot time,
          * get out of here now!
          */
         if (!smp_found_config && !acpi_lapic) {
                 printk(KERN_NOTICE "SMP motherboard not detected.\n");
-                smpboot_clear_io_apic_irqs();
-                phys_cpu_present_map = physid_mask_of_physid(0);
-                if (APIC_init_uniprocessor())
-                        printk(KERN_NOTICE "Local APIC not detected."
-                                           " Using dummy APIC emulation.\n");
-                map_cpu_to_logical_apicid();
-                cpu_set(0, cpu_sibling_map[0]);
-                cpu_set(0, cpu_core_map[0]);
+                disable_smp();
                 return;
         }
 
         /*
-         * Should not be necessary because the MP table should list the boot
-         * CPU too, but we do it for the sake of robustness anyway.
-         * Makes no sense to do this check in clustered apic mode, so skip it
-         */
-        if (!check_phys_apicid_present(boot_cpu_physical_apicid)) {
-                printk("weird, boot CPU (#%d) not listed by the BIOS.\n",
-                                boot_cpu_physical_apicid);
-                physid_set(hard_smp_processor_id(), phys_cpu_present_map);
-        }
-
-        /*
-         * If we couldn't find a local APIC, then get out of here now!
-         */
-        if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid]) && !cpu_has_apic) {
-                printk(KERN_ERR "BIOS bug, local APIC #%d not detected!...\n",
-                        boot_cpu_physical_apicid);
-                printk(KERN_ERR "... forcing use of dummy APIC emulation. (tell your hw vendor)\n");
-                smpboot_clear_io_apic_irqs();
-                phys_cpu_present_map = physid_mask_of_physid(0);
-                cpu_set(0, cpu_sibling_map[0]);
-                cpu_set(0, cpu_core_map[0]);
-                return;
-        }
-
-        verify_local_APIC();
-
-        /*
          * If SMP should be disabled, then really disable it!
          */
-        if (!max_cpus) {
-                smp_found_config = 0;
-                printk(KERN_INFO "SMP mode deactivated, forcing use of dummy APIC emulation.\n");
-                smpboot_clear_io_apic_irqs();
-                phys_cpu_present_map = physid_mask_of_physid(0);
-                cpu_set(0, cpu_sibling_map[0]);
-                cpu_set(0, cpu_core_map[0]);
+        if (!max_cpus || (enable_local_apic < 0)) {
+                printk(KERN_INFO "SMP mode deactivated.\n");
+                disable_smp();
                 return;
         }
 
-        connect_bsp_APIC();
-        setup_local_APIC();
-        map_cpu_to_logical_apicid();
-
-
         setup_portio_remap();
 
         /*
@@ -1240,10 +1212,6 @@ static void __init smp_boot_cpus(unsigned int max_cpus)
         cpu_set(0, cpu_sibling_map[0]);
         cpu_set(0, cpu_core_map[0]);
 
-        smpboot_setup_io_apic();
-
-        setup_boot_APIC_clock();
-
         /*
          * Synchronize the TSC with the AP
          */
diff --git a/arch/i386/kernel/srat.c b/arch/i386/kernel/srat.c
index 516bf5653b02..8de658db8146 100644
--- a/arch/i386/kernel/srat.c
+++ b/arch/i386/kernel/srat.c
@@ -327,7 +327,12 @@ int __init get_memcfg_from_srat(void)
         int tables = 0;
         int i = 0;
 
-        acpi_find_root_pointer(ACPI_PHYSICAL_ADDRESSING, rsdp_address);
+        if (ACPI_FAILURE(acpi_find_root_pointer(ACPI_PHYSICAL_ADDRESSING,
+                                                rsdp_address))) {
+                printk("%s: System description tables not found\n",
+                       __FUNCTION__);
+                goto out_err;
+        }
 
         if (rsdp_address->pointer_type == ACPI_PHYSICAL_POINTER) {
                 printk("%s: assigning address to rsdp\n", __FUNCTION__);
diff --git a/arch/i386/kernel/time.c b/arch/i386/kernel/time.c
index 2883a4d4f01f..07471bba2dc6 100644
--- a/arch/i386/kernel/time.c
+++ b/arch/i386/kernel/time.c
@@ -74,10 +74,6 @@ int pit_latch_buggy;              /* extern */
 
 #include "do_timer.h"
 
-u64 jiffies_64 = INITIAL_JIFFIES;
-
-EXPORT_SYMBOL(jiffies_64);
-
 unsigned int cpu_khz;   /* Detected as we calibrate the TSC */
 EXPORT_SYMBOL(cpu_khz);
 
@@ -444,8 +440,8 @@ static int time_init_device(void)
 
 device_initcall(time_init_device);
 
-#ifdef CONFIG_HPET_TIMER
 extern void (*late_time_init)(void);
+#ifdef CONFIG_HPET_TIMER
 /* Duplicate of time_init() below, with hpet_enable part added */
 static void __init hpet_time_init(void)
 {
@@ -462,6 +458,11 @@ static void __init hpet_time_init(void)
         printk(KERN_INFO "Using %s for high-res timesource\n",cur_timer->name);
 
         time_init_hook();
+
+#ifdef CONFIG_X86_LOCAL_APIC
+        if (enable_local_apic >= 0)
+                APIC_late_time_init();
+#endif
 }
 #endif
 
@@ -486,4 +487,9 @@ void __init time_init(void)
         printk(KERN_INFO "Using %s for high-res timesource\n",cur_timer->name);
 
         time_init_hook();
+
+#ifdef CONFIG_X86_LOCAL_APIC
+        if (enable_local_apic >= 0)
+                late_time_init = APIC_late_time_init;
+#endif
 }
diff --git a/arch/i386/kernel/time_hpet.c b/arch/i386/kernel/time_hpet.c
index 658c0629ba6a..9caeaa315cd7 100644
--- a/arch/i386/kernel/time_hpet.c
+++ b/arch/i386/kernel/time_hpet.c
@@ -275,6 +275,7 @@ static unsigned long PIE_freq = DEFAULT_RTC_INT_FREQ;
 static unsigned long PIE_count;
 
 static unsigned long hpet_rtc_int_freq; /* RTC interrupt frequency */
+static unsigned int hpet_t1_cmp; /* cached comparator register */
 
 /*
  * Timer 1 for RTC, we do not use periodic interrupt feature,
@@ -306,10 +307,12 @@ int hpet_rtc_timer_init(void)
         cnt = hpet_readl(HPET_COUNTER);
         cnt += ((hpet_tick*HZ)/hpet_rtc_int_freq);
         hpet_writel(cnt, HPET_T1_CMP);
+        hpet_t1_cmp = cnt;
         local_irq_restore(flags);
 
         cfg = hpet_readl(HPET_T1_CFG);
-        cfg |= HPET_TN_ENABLE | HPET_TN_SETVAL | HPET_TN_32BIT;
+        cfg &= ~HPET_TN_PERIODIC;
+        cfg |= HPET_TN_ENABLE | HPET_TN_32BIT;
         hpet_writel(cfg, HPET_T1_CFG);
 
         return 1;
@@ -319,8 +322,12 @@ static void hpet_rtc_timer_reinit(void)
 {
         unsigned int cfg, cnt;
 
-        if (!(PIE_on | AIE_on | UIE_on))
+        if (unlikely(!(PIE_on | AIE_on | UIE_on))) {
+                cfg = hpet_readl(HPET_T1_CFG);
+                cfg &= ~HPET_TN_ENABLE;
+                hpet_writel(cfg, HPET_T1_CFG);
                 return;
+        }
 
         if (PIE_on && (PIE_freq > DEFAULT_RTC_INT_FREQ))
                 hpet_rtc_int_freq = PIE_freq;
@@ -328,15 +335,10 @@ static void hpet_rtc_timer_reinit(void)
                 hpet_rtc_int_freq = DEFAULT_RTC_INT_FREQ;
 
         /* It is more accurate to use the comparator value than current count.*/
-        cnt = hpet_readl(HPET_T1_CMP);
+        cnt = hpet_t1_cmp;
         cnt += hpet_tick*HZ/hpet_rtc_int_freq;
         hpet_writel(cnt, HPET_T1_CMP);
-
-        cfg = hpet_readl(HPET_T1_CFG);
-        cfg |= HPET_TN_ENABLE | HPET_TN_SETVAL | HPET_TN_32BIT;
-        hpet_writel(cfg, HPET_T1_CFG);
-
-        return;
+        hpet_t1_cmp = cnt;
 }
 
 /*
diff --git a/arch/i386/kernel/timers/timer_hpet.c b/arch/i386/kernel/timers/timer_hpet.c
index d973a8b681fd..be242723c339 100644
--- a/arch/i386/kernel/timers/timer_hpet.c
+++ b/arch/i386/kernel/timers/timer_hpet.c
@@ -30,23 +30,28 @@ static seqlock_t monotonic_lock = SEQLOCK_UNLOCKED;
  *  basic equation:
  *              ns = cycles / (freq / ns_per_sec)
  *              ns = cycles * (ns_per_sec / freq)
- *              ns = cycles * (10^9 / (cpu_mhz * 10^6))
- *              ns = cycles * (10^3 / cpu_mhz)
+ *              ns = cycles * (10^9 / (cpu_khz * 10^3))
+ *              ns = cycles * (10^6 / cpu_khz)
  *
  *      Then we use scaling math (suggested by george@mvista.com) to get:
- *              ns = cycles * (10^3 * SC / cpu_mhz) / SC
+ *              ns = cycles * (10^6 * SC / cpu_khz) / SC
  *              ns = cycles * cyc2ns_scale / SC
  *
  *      And since SC is a constant power of two, we can convert the div
  *  into a shift.
+ *
+ *  We can use khz divisor instead of mhz to keep a better percision, since
+ *  cyc2ns_scale is limited to 10^6 * 2^10, which fits in 32 bits.
+ *  (mathieu.desnoyers@polymtl.ca)
+ *
  *                      -johnstul@us.ibm.com "math is hard, lets go shopping!"
  */
 static unsigned long cyc2ns_scale;
 #define CYC2NS_SCALE_FACTOR 10 /* 2^10, carefully chosen */
 
-static inline void set_cyc2ns_scale(unsigned long cpu_mhz)
+static inline void set_cyc2ns_scale(unsigned long cpu_khz)
 {
-        cyc2ns_scale = (1000 << CYC2NS_SCALE_FACTOR)/cpu_mhz;
+        cyc2ns_scale = (1000000 << CYC2NS_SCALE_FACTOR)/cpu_khz;
 }
 
 static inline unsigned long long cycles_2_ns(unsigned long long cyc)
@@ -163,7 +168,7 @@ static int __init init_hpet(char* override)
                                 printk("Detected %u.%03u MHz processor.\n",
                                         cpu_khz / 1000, cpu_khz % 1000);
                         }
-                        set_cyc2ns_scale(cpu_khz/1000);
+                        set_cyc2ns_scale(cpu_khz);
                 }
                 /* set this only when cpu_has_tsc */
                 timer_hpet.read_timer = read_timer_tsc;
diff --git a/arch/i386/kernel/timers/timer_tsc.c b/arch/i386/kernel/timers/timer_tsc.c
index 6dd470cc9f72..d395e3b42485 100644
--- a/arch/i386/kernel/timers/timer_tsc.c
+++ b/arch/i386/kernel/timers/timer_tsc.c
@@ -49,23 +49,28 @@ static seqlock_t monotonic_lock = SEQLOCK_UNLOCKED;
  *  basic equation:
  *              ns = cycles / (freq / ns_per_sec)
  *              ns = cycles * (ns_per_sec / freq)
- *              ns = cycles * (10^9 / (cpu_mhz * 10^6))
- *              ns = cycles * (10^3 / cpu_mhz)
+ *              ns = cycles * (10^9 / (cpu_khz * 10^3))
+ *              ns = cycles * (10^6 / cpu_khz)
  *
  *      Then we use scaling math (suggested by george@mvista.com) to get:
- *              ns = cycles * (10^3 * SC / cpu_mhz) / SC
+ *              ns = cycles * (10^6 * SC / cpu_khz) / SC
  *              ns = cycles * cyc2ns_scale / SC
  *
  *      And since SC is a constant power of two, we can convert the div
- *  into a shift.   
+ *  into a shift.
+ *
+ *  We can use khz divisor instead of mhz to keep a better percision, since
+ *  cyc2ns_scale is limited to 10^6 * 2^10, which fits in 32 bits.
+ *  (mathieu.desnoyers@polymtl.ca)
+ *
  *                      -johnstul@us.ibm.com "math is hard, lets go shopping!"
  */
 static unsigned long cyc2ns_scale; 
 #define CYC2NS_SCALE_FACTOR 10 /* 2^10, carefully chosen */
 
-static inline void set_cyc2ns_scale(unsigned long cpu_mhz)
+static inline void set_cyc2ns_scale(unsigned long cpu_khz)
 {
-        cyc2ns_scale = (1000 << CYC2NS_SCALE_FACTOR)/cpu_mhz;
+        cyc2ns_scale = (1000000 << CYC2NS_SCALE_FACTOR)/cpu_khz;
 }
 
 static inline unsigned long long cycles_2_ns(unsigned long long cyc)
@@ -286,7 +291,7 @@ time_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
                 if (use_tsc) {
                         if (!(freq->flags & CPUFREQ_CONST_LOOPS)) {
                                 fast_gettimeoffset_quotient = cpufreq_scale(fast_gettimeoffset_ref, freq->new, ref_freq);
-                                set_cyc2ns_scale(cpu_khz/1000);
+                                set_cyc2ns_scale(cpu_khz);
                         }
                 }
 #endif
@@ -536,7 +541,7 @@ static int __init init_tsc(char* override)
                                 printk("Detected %u.%03u MHz processor.\n",
                                         cpu_khz / 1000, cpu_khz % 1000);
                         }
-                        set_cyc2ns_scale(cpu_khz/1000);
+                        set_cyc2ns_scale(cpu_khz);
                         return 0;
                 }
         }
diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c
index 19e90bdd84ea..c34d1bfc5161 100644
--- a/arch/i386/kernel/traps.c
+++ b/arch/i386/kernel/traps.c
@@ -488,6 +488,7 @@ fastcall void __kprobes do_general_protection(struct pt_regs * regs,
                                 tss->io_bitmap_max - thread->io_bitmap_max);
                 tss->io_bitmap_max = thread->io_bitmap_max;
                 tss->io_bitmap_base = IO_BITMAP_OFFSET;
+                tss->io_bitmap_owner = thread;
                 put_cpu();
                 return;
         }
diff --git a/arch/i386/kernel/vm86.c b/arch/i386/kernel/vm86.c
index 16b485009622..fc1993564f98 100644
--- a/arch/i386/kernel/vm86.c
+++ b/arch/i386/kernel/vm86.c
@@ -134,17 +134,16 @@ struct pt_regs * fastcall save_v86_state(struct kernel_vm86_regs * regs)
         return ret;
 }
 
-static void mark_screen_rdonly(struct task_struct * tsk)
+static void mark_screen_rdonly(struct mm_struct *mm)
 {
         pgd_t *pgd;
         pud_t *pud;
         pmd_t *pmd;
-        pte_t *pte, *mapped;
+        pte_t *pte;
+        spinlock_t *ptl;
         int i;
 
-        preempt_disable();
-        spin_lock(&tsk->mm->page_table_lock);
-        pgd = pgd_offset(tsk->mm, 0xA0000);
+        pgd = pgd_offset(mm, 0xA0000);
         if (pgd_none_or_clear_bad(pgd))
                 goto out;
         pud = pud_offset(pgd, 0xA0000);
@@ -153,16 +152,14 @@ static void mark_screen_rdonly(struct task_struct * tsk)
         pmd = pmd_offset(pud, 0xA0000);
         if (pmd_none_or_clear_bad(pmd))
                 goto out;
-        pte = mapped = pte_offset_map(pmd, 0xA0000);
+        pte = pte_offset_map_lock(mm, pmd, 0xA0000, &ptl);
         for (i = 0; i < 32; i++) {
                 if (pte_present(*pte))
                         set_pte(pte, pte_wrprotect(*pte));
                 pte++;
         }
-        pte_unmap(mapped);
+        pte_unmap_unlock(pte, ptl);
 out:
-        spin_unlock(&tsk->mm->page_table_lock);
-        preempt_enable();
         flush_tlb();
 }
 
@@ -306,7 +303,7 @@ static void do_sys_vm86(struct kernel_vm86_struct *info, struct task_struct *tsk
 
         tsk->thread.screen_bitmap = info->screen_bitmap;
         if (info->flags & VM86_SCREEN_BITMAP)
-                mark_screen_rdonly(tsk);
+                mark_screen_rdonly(tsk->mm);
         __asm__ __volatile__(
                 "xorl %%eax,%%eax; movl %%eax,%%fs; movl %%eax,%%gs\n\t"
                 "movl %0,%%esp\n\t"