27 files changed, 199 insertions, 235 deletions

diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index bac0da731ee3..dbf90ad6eac3 100644
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -997,8 +997,21 @@ source "drivers/Kconfig"
 
 source "fs/Kconfig"
 
+menu "Instrumentation Support"
+        depends on EXPERIMENTAL
+
 source "arch/i386/oprofile/Kconfig"
 
+config KPROBES
+        bool "Kprobes (EXPERIMENTAL)"
+        help
+          Kprobes allows you to trap at almost any kernel address and
+          execute a callback function.  register_kprobe() establishes
+          a probepoint and specifies the callback.  Kprobes is useful
+          for kernel debugging, non-intrusive instrumentation and testing.
+          If in doubt, say "N".
+endmenu
+
 source "arch/i386/Kconfig.debug"
 
 source "security/Kconfig"
diff --git a/arch/i386/Kconfig.debug b/arch/i386/Kconfig.debug
index 5228c40a6fb2..c48b424dd640 100644
--- a/arch/i386/Kconfig.debug
+++ b/arch/i386/Kconfig.debug
@@ -22,16 +22,6 @@ config DEBUG_STACKOVERFLOW
           This option will cause messages to be printed if free stack space
           drops below a certain limit.
 
-config KPROBES
-        bool "Kprobes"
-        depends on DEBUG_KERNEL
-        help
-          Kprobes allows you to trap at almost any kernel address and
-          execute a callback function.  register_kprobe() establishes
-          a probepoint and specifies the callback.  Kprobes is useful
-          for kernel debugging, non-intrusive instrumentation and testing.
-          If in doubt, say "N".
-
 config DEBUG_STACK_USAGE
         bool "Stack utilization instrumentation"
         depends on DEBUG_KERNEL
diff --git a/arch/i386/kernel/apic.c b/arch/i386/kernel/apic.c
index 7c724ffa08bb..496a2c9909fe 100644
--- a/arch/i386/kernel/apic.c
+++ b/arch/i386/kernel/apic.c
@@ -559,14 +559,20 @@ void __devinit setup_local_APIC(void)
  * If Linux enabled the LAPIC against the BIOS default
  * disable it down before re-entering the BIOS on shutdown.
  * Otherwise the BIOS may get confused and not power-off.
+ * Additionally clear all LVT entries before disable_local_APIC
+ * for the case where Linux didn't enable the LAPIC.
  */
 void lapic_shutdown(void)
 {
-        if (!cpu_has_apic || !enabled_via_apicbase)
+        if (!cpu_has_apic)
                 return;
 
         local_irq_disable();
-        disable_local_APIC();
+        clear_local_APIC();
+
+        if (enabled_via_apicbase)
+                disable_local_APIC();
+
         local_irq_enable();
 }
 
diff --git a/arch/i386/kernel/apm.c b/arch/i386/kernel/apm.c
index d2ef0c2aa93e..003548b8735f 100644
--- a/arch/i386/kernel/apm.c
+++ b/arch/i386/kernel/apm.c
@@ -447,8 +447,7 @@ static char *	apm_event_name[] = {
         "system standby resume",
         "capabilities change"
 };
-#define NR_APM_EVENT_NAME       \
-                (sizeof(apm_event_name) / sizeof(apm_event_name[0]))
+#define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
 
 typedef struct lookup_t {
         int     key;
@@ -479,7 +478,7 @@ static const lookup_t error_table[] = {
         { APM_NO_ERROR,         "BIOS did not set a return code" },
         { APM_NOT_PRESENT,      "No APM present" }
 };
-#define ERROR_COUNT     (sizeof(error_table)/sizeof(lookup_t))
+#define ERROR_COUNT     ARRAY_SIZE(error_table)
 
 /**
  *      apm_error       -       display an APM error
@@ -770,8 +769,26 @@ static int set_system_power_state(u_short state)
 static int apm_do_idle(void)
 {
         u32     eax;
+        u8      ret = 0;
+        int     idled = 0;
+        int     polling;
+
+        polling = test_thread_flag(TIF_POLLING_NRFLAG);
+        if (polling) {
+                clear_thread_flag(TIF_POLLING_NRFLAG);
+                smp_mb__after_clear_bit();
+        }
+        if (!need_resched()) {
+                idled = 1;
+                ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax);
+        }
+        if (polling)
+                set_thread_flag(TIF_POLLING_NRFLAG);
+
+        if (!idled)
+                return 0;
 
-        if (apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax)) {
+        if (ret) {
                 static unsigned long t;
 
                 /* This always fails on some SMP boards running UP kernels.
diff --git a/arch/i386/kernel/cpu/common.c b/arch/i386/kernel/cpu/common.c
index 74145a33cb0f..c145fb30002e 100644
--- a/arch/i386/kernel/cpu/common.c
+++ b/arch/i386/kernel/cpu/common.c
@@ -30,8 +30,6 @@ static int disable_x86_serial_nr __devinitdata = 1;
 
 struct cpu_dev * cpu_devs[X86_VENDOR_NUM] = {};
 
-extern void mcheck_init(struct cpuinfo_x86 *c);
-
 extern int disable_pse;
 
 static void default_init(struct cpuinfo_x86 * c)
@@ -429,9 +427,8 @@ void __devinit identify_cpu(struct cpuinfo_x86 *c)
         }
 
         /* Init Machine Check Exception if available. */
-#ifdef CONFIG_X86_MCE
         mcheck_init(c);
-#endif
+
         if (c == &boot_cpu_data)
                 sysenter_setup();
         enable_sep_cpu();
diff --git a/arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c b/arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c
index caa9f7711343..871366b83b3f 100644
--- a/arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c
+++ b/arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c
@@ -377,10 +377,9 @@ acpi_cpufreq_cpu_init (
         arg0.buffer.length = 12;
         arg0.buffer.pointer = (u8 *) arg0_buf;
 
-        data = kmalloc(sizeof(struct cpufreq_acpi_io), GFP_KERNEL);
+        data = kzalloc(sizeof(struct cpufreq_acpi_io), GFP_KERNEL);
         if (!data)
                 return (-ENOMEM);
-        memset(data, 0, sizeof(struct cpufreq_acpi_io));
 
         acpi_io_data[cpu] = data;
 
diff --git a/arch/i386/kernel/cpu/cpufreq/powernow-k7.c b/arch/i386/kernel/cpu/cpufreq/powernow-k7.c
index 73a5dc5b26b8..edcd626001da 100644
--- a/arch/i386/kernel/cpu/cpufreq/powernow-k7.c
+++ b/arch/i386/kernel/cpu/cpufreq/powernow-k7.c
@@ -171,10 +171,9 @@ static int get_ranges (unsigned char *pst)
         unsigned int speed;
         u8 fid, vid;
 
-        powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table) * (number_scales + 1)), GFP_KERNEL);
+        powernow_table = kzalloc((sizeof(struct cpufreq_frequency_table) * (number_scales + 1)), GFP_KERNEL);
         if (!powernow_table)
                 return -ENOMEM;
-        memset(powernow_table, 0, (sizeof(struct cpufreq_frequency_table) * (number_scales + 1)));
 
         for (j=0 ; j < number_scales; j++) {
                 fid = *pst++;
@@ -305,16 +304,13 @@ static int powernow_acpi_init(void)
                 goto err0;
         }
 
-        acpi_processor_perf = kmalloc(sizeof(struct acpi_processor_performance),
+        acpi_processor_perf = kzalloc(sizeof(struct acpi_processor_performance),
                                       GFP_KERNEL);
-
         if (!acpi_processor_perf) {
                 retval = -ENOMEM;
                 goto err0;
         }
 
-        memset(acpi_processor_perf, 0, sizeof(struct acpi_processor_performance));
-
         if (acpi_processor_register_performance(acpi_processor_perf, 0)) {
                 retval = -EIO;
                 goto err1;
@@ -337,14 +333,12 @@ static int powernow_acpi_init(void)
                 goto err2;
         }
 
-        powernow_table = kmalloc((number_scales + 1) * (sizeof(struct cpufreq_frequency_table)), GFP_KERNEL);
+        powernow_table = kzalloc((number_scales + 1) * (sizeof(struct cpufreq_frequency_table)), GFP_KERNEL);
         if (!powernow_table) {
                 retval = -ENOMEM;
                 goto err2;
         }
 
-        memset(powernow_table, 0, ((number_scales + 1) * sizeof(struct cpufreq_frequency_table)));
-
         pc.val = (unsigned long) acpi_processor_perf->states[0].control;
         for (i = 0; i < number_scales; i++) {
                 u8 fid, vid;
diff --git a/arch/i386/kernel/cpu/cpufreq/powernow-k8.c b/arch/i386/kernel/cpu/cpufreq/powernow-k8.c
index 2d5c9adba0cd..68a1fc87f4ca 100644
--- a/arch/i386/kernel/cpu/cpufreq/powernow-k8.c
+++ b/arch/i386/kernel/cpu/cpufreq/powernow-k8.c
@@ -462,7 +462,6 @@ static int check_supported_cpu(unsigned int cpu)
 
         oldmask = current->cpus_allowed;
         set_cpus_allowed(current, cpumask_of_cpu(cpu));
-        schedule();
 
         if (smp_processor_id() != cpu) {
                 printk(KERN_ERR "limiting to cpu %u failed\n", cpu);
@@ -497,9 +496,7 @@ static int check_supported_cpu(unsigned int cpu)
 
 out:
         set_cpus_allowed(current, oldmask);
-        schedule();
         return rc;
-
 }
 
 static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
@@ -913,7 +910,6 @@ static int powernowk8_target(struct cpufreq_policy *pol, unsigned targfreq, unsi
         /* only run on specific CPU from here on */
         oldmask = current->cpus_allowed;
         set_cpus_allowed(current, cpumask_of_cpu(pol->cpu));
-        schedule();
 
         if (smp_processor_id() != pol->cpu) {
                 printk(KERN_ERR "limiting to cpu %u failed\n", pol->cpu);
@@ -968,8 +964,6 @@ static int powernowk8_target(struct cpufreq_policy *pol, unsigned targfreq, unsi
 
 err_out:
         set_cpus_allowed(current, oldmask);
-        schedule();
-
         return ret;
 }
 
@@ -991,12 +985,11 @@ static int __init powernowk8_cpu_init(struct cpufreq_policy *pol)
         if (!check_supported_cpu(pol->cpu))
                 return -ENODEV;
 
-        data = kmalloc(sizeof(struct powernow_k8_data), GFP_KERNEL);
+        data = kzalloc(sizeof(struct powernow_k8_data), GFP_KERNEL);
         if (!data) {
                 printk(KERN_ERR PFX "unable to alloc powernow_k8_data");
                 return -ENOMEM;
         }
-        memset(data,0,sizeof(struct powernow_k8_data));
 
         data->cpu = pol->cpu;
 
@@ -1026,7 +1019,6 @@ static int __init powernowk8_cpu_init(struct cpufreq_policy *pol)
         /* only run on specific CPU from here on */
         oldmask = current->cpus_allowed;
         set_cpus_allowed(current, cpumask_of_cpu(pol->cpu));
-        schedule();
 
         if (smp_processor_id() != pol->cpu) {
                 printk(KERN_ERR "limiting to cpu %u failed\n", pol->cpu);
@@ -1045,7 +1037,6 @@ static int __init powernowk8_cpu_init(struct cpufreq_policy *pol)
 
         /* run on any CPU again */
         set_cpus_allowed(current, oldmask);
-        schedule();
 
         pol->governor = CPUFREQ_DEFAULT_GOVERNOR;
         pol->cpus = cpu_core_map[pol->cpu];
@@ -1080,7 +1071,6 @@ static int __init powernowk8_cpu_init(struct cpufreq_policy *pol)
 
 err_out:
         set_cpus_allowed(current, oldmask);
-        schedule();
         powernow_k8_cpu_exit_acpi(data);
 
         kfree(data);
@@ -1116,17 +1106,14 @@ static unsigned int powernowk8_get (unsigned int cpu)
                 set_cpus_allowed(current, oldmask);
                 return 0;
         }
-        preempt_disable();
-        
+
         if (query_current_values_with_pending_wait(data))
                 goto out;
 
         khz = find_khz_freq_from_fid(data->currfid);
 
- out:
-        preempt_enable_no_resched();
+out:
         set_cpus_allowed(current, oldmask);
-
         return khz;
 }
 
diff --git a/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c b/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c
index 1465974256c9..edb9873e27e3 100644
--- a/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c
+++ b/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c
@@ -67,7 +67,7 @@ static const struct cpu_id cpu_ids[] = {
         [CPU_MP4HT_D0]  = {15,  3, 4 },
         [CPU_MP4HT_E0]  = {15,  4, 1 },
 };
-#define N_IDS   (sizeof(cpu_ids)/sizeof(cpu_ids[0]))
+#define N_IDS   ARRAY_SIZE(cpu_ids)
 
 struct cpu_model
 {
@@ -423,12 +423,11 @@ static int centrino_cpu_init_acpi(struct cpufreq_policy *policy)
                 }
         }
 
-        centrino_model[cpu] = kmalloc(sizeof(struct cpu_model), GFP_KERNEL);
+        centrino_model[cpu] = kzalloc(sizeof(struct cpu_model), GFP_KERNEL);
         if (!centrino_model[cpu]) {
                 result = -ENOMEM;
                 goto err_unreg;
         }
-        memset(centrino_model[cpu], 0, sizeof(struct cpu_model));
 
         centrino_model[cpu]->model_name=NULL;
         centrino_model[cpu]->max_freq = p.states[0].core_frequency * 1000;
diff --git a/arch/i386/kernel/cpu/mcheck/k7.c b/arch/i386/kernel/cpu/mcheck/k7.c
index 7c6b9c73522f..fc5d5215e23d 100644
--- a/arch/i386/kernel/cpu/mcheck/k7.c
+++ b/arch/i386/kernel/cpu/mcheck/k7.c
@@ -68,7 +68,7 @@ static fastcall void k7_machine_check(struct pt_regs * regs, long error_code)
 
 
 /* AMD K7 machine check is Intel like */
-void __devinit amd_mcheck_init(struct cpuinfo_x86 *c)
+void amd_mcheck_init(struct cpuinfo_x86 *c)
 {
         u32 l, h;
         int i;
diff --git a/arch/i386/kernel/cpu/mcheck/mce.c b/arch/i386/kernel/cpu/mcheck/mce.c
index 2cf25d2ba0f1..6170af3c271a 100644
--- a/arch/i386/kernel/cpu/mcheck/mce.c
+++ b/arch/i386/kernel/cpu/mcheck/mce.c
@@ -16,7 +16,7 @@
 
 #include "mce.h"
 
-int mce_disabled __devinitdata = 0;
+int mce_disabled = 0;
 int nr_mce_banks;
 
 EXPORT_SYMBOL_GPL(nr_mce_banks);        /* non-fatal.o */
@@ -31,7 +31,7 @@ static fastcall void unexpected_machine_check(struct pt_regs * regs, long error_
 void fastcall (*machine_check_vector)(struct pt_regs *, long error_code) = unexpected_machine_check;
 
 /* This has to be run for each processor */
-void __devinit mcheck_init(struct cpuinfo_x86 *c)
+void mcheck_init(struct cpuinfo_x86 *c)
 {
         if (mce_disabled==1)
                 return;
diff --git a/arch/i386/kernel/cpu/mcheck/p4.c b/arch/i386/kernel/cpu/mcheck/p4.c
index 1d1e885f500a..fd2c459a31ef 100644
--- a/arch/i386/kernel/cpu/mcheck/p4.c
+++ b/arch/i386/kernel/cpu/mcheck/p4.c
@@ -77,7 +77,7 @@ fastcall void smp_thermal_interrupt(struct pt_regs *regs)
 }
 
 /* P4/Xeon Thermal regulation detect and init */
-static void __devinit intel_init_thermal(struct cpuinfo_x86 *c)
+static void intel_init_thermal(struct cpuinfo_x86 *c)
 {
         u32 l, h;
         unsigned int cpu = smp_processor_id();
@@ -231,7 +231,7 @@ static fastcall void intel_machine_check(struct pt_regs * regs, long error_code)
 }
 
 
-void __devinit intel_p4_mcheck_init(struct cpuinfo_x86 *c)
+void intel_p4_mcheck_init(struct cpuinfo_x86 *c)
 {
         u32 l, h;
         int i;
diff --git a/arch/i386/kernel/cpu/mcheck/p5.c b/arch/i386/kernel/cpu/mcheck/p5.c
index 3a2e24baddc7..94bc43d950cf 100644
--- a/arch/i386/kernel/cpu/mcheck/p5.c
+++ b/arch/i386/kernel/cpu/mcheck/p5.c
@@ -28,7 +28,7 @@ static fastcall void pentium_machine_check(struct pt_regs * regs, long error_cod
 }
 
 /* Set up machine check reporting for processors with Intel style MCE */
-void __devinit intel_p5_mcheck_init(struct cpuinfo_x86 *c)
+void intel_p5_mcheck_init(struct cpuinfo_x86 *c)
 {
         u32 l, h;
         
diff --git a/arch/i386/kernel/cpu/mcheck/p6.c b/arch/i386/kernel/cpu/mcheck/p6.c
index 979b18bc95c1..deeae42ce199 100644
--- a/arch/i386/kernel/cpu/mcheck/p6.c
+++ b/arch/i386/kernel/cpu/mcheck/p6.c
@@ -79,7 +79,7 @@ static fastcall void intel_machine_check(struct pt_regs * regs, long error_code)
 }
 
 /* Set up machine check reporting for processors with Intel style MCE */
-void __devinit intel_p6_mcheck_init(struct cpuinfo_x86 *c)
+void intel_p6_mcheck_init(struct cpuinfo_x86 *c)
 {
         u32 l, h;
         int i;
diff --git a/arch/i386/kernel/cpu/mcheck/winchip.c b/arch/i386/kernel/cpu/mcheck/winchip.c
index 5b9d2dd411d3..9e424b6c293d 100644
--- a/arch/i386/kernel/cpu/mcheck/winchip.c
+++ b/arch/i386/kernel/cpu/mcheck/winchip.c
@@ -22,7 +22,7 @@ static fastcall void winchip_machine_check(struct pt_regs * regs, long error_cod
 }
 
 /* Set up machine check reporting on the Winchip C6 series */
-void __devinit winchip_mcheck_init(struct cpuinfo_x86 *c)
+void winchip_mcheck_init(struct cpuinfo_x86 *c)
 {
         u32 lo, hi;
         machine_check_vector = winchip_machine_check;
diff --git a/arch/i386/kernel/ioport.c b/arch/i386/kernel/ioport.c
index f2b37654777f..b59a34dbe262 100644
--- a/arch/i386/kernel/ioport.c
+++ b/arch/i386/kernel/ioport.c
@@ -108,8 +108,11 @@ asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on)
         /*
          * Sets the lazy trigger so that the next I/O operation will
          * reload the correct bitmap.
+         * Reset the owner so that a process switch will not set
+         * tss->io_bitmap_base to IO_BITMAP_OFFSET.
          */
         tss->io_bitmap_base = INVALID_IO_BITMAP_OFFSET_LAZY;
+        tss->io_bitmap_owner = NULL;
 
         put_cpu();
 
diff --git a/arch/i386/kernel/kprobes.c b/arch/i386/kernel/kprobes.c
index 6345b430b105..32b0c24ab9a6 100644
--- a/arch/i386/kernel/kprobes.c
+++ b/arch/i386/kernel/kprobes.c
@@ -31,22 +31,16 @@
 #include <linux/config.h>
 #include <linux/kprobes.h>
 #include <linux/ptrace.h>
-#include <linux/spinlock.h>
 #include <linux/preempt.h>
 #include <asm/cacheflush.h>
 #include <asm/kdebug.h>
 #include <asm/desc.h>
 
-static struct kprobe *current_kprobe;
-static unsigned long kprobe_status, kprobe_old_eflags, kprobe_saved_eflags;
-static struct kprobe *kprobe_prev;
-static unsigned long kprobe_status_prev, kprobe_old_eflags_prev, kprobe_saved_eflags_prev;
-static struct pt_regs jprobe_saved_regs;
-static long *jprobe_saved_esp;
-/* copy of the kernel stack at the probe fire time */
-static kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE];
 void jprobe_return_end(void);
 
+DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL;
+DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
+
 /*
  * returns non-zero if opcode modifies the interrupt flag.
  */
@@ -91,29 +85,30 @@ void __kprobes arch_remove_kprobe(struct kprobe *p)
 {
 }
 
-static inline void save_previous_kprobe(void)
+static inline void save_previous_kprobe(struct kprobe_ctlblk *kcb)
 {
-        kprobe_prev = current_kprobe;
-        kprobe_status_prev = kprobe_status;
-        kprobe_old_eflags_prev = kprobe_old_eflags;
-        kprobe_saved_eflags_prev = kprobe_saved_eflags;
+        kcb->prev_kprobe.kp = kprobe_running();
+        kcb->prev_kprobe.status = kcb->kprobe_status;
+        kcb->prev_kprobe.old_eflags = kcb->kprobe_old_eflags;
+        kcb->prev_kprobe.saved_eflags = kcb->kprobe_saved_eflags;
 }
 
-static inline void restore_previous_kprobe(void)
+static inline void restore_previous_kprobe(struct kprobe_ctlblk *kcb)
 {
-        current_kprobe = kprobe_prev;
-        kprobe_status = kprobe_status_prev;
-        kprobe_old_eflags = kprobe_old_eflags_prev;
-        kprobe_saved_eflags = kprobe_saved_eflags_prev;
+        __get_cpu_var(current_kprobe) = kcb->prev_kprobe.kp;
+        kcb->kprobe_status = kcb->prev_kprobe.status;
+        kcb->kprobe_old_eflags = kcb->prev_kprobe.old_eflags;
+        kcb->kprobe_saved_eflags = kcb->prev_kprobe.saved_eflags;
 }
 
-static inline void set_current_kprobe(struct kprobe *p, struct pt_regs *regs)
+static inline void set_current_kprobe(struct kprobe *p, struct pt_regs *regs,
+                                struct kprobe_ctlblk *kcb)
 {
-        current_kprobe = p;
-        kprobe_saved_eflags = kprobe_old_eflags
+        __get_cpu_var(current_kprobe) = p;
+        kcb->kprobe_saved_eflags = kcb->kprobe_old_eflags
                 = (regs->eflags & (TF_MASK | IF_MASK));
         if (is_IF_modifier(p->opcode))
-                kprobe_saved_eflags &= ~IF_MASK;
+                kcb->kprobe_saved_eflags &= ~IF_MASK;
 }
 
 static inline void prepare_singlestep(struct kprobe *p, struct pt_regs *regs)
@@ -127,6 +122,7 @@ static inline void prepare_singlestep(struct kprobe *p, struct pt_regs *regs)
                 regs->eip = (unsigned long)&p->ainsn.insn;
 }
 
+/* Called with kretprobe_lock held */
 void __kprobes arch_prepare_kretprobe(struct kretprobe *rp,
                                       struct pt_regs *regs)
 {
@@ -157,9 +153,15 @@ static int __kprobes kprobe_handler(struct pt_regs *regs)
         int ret = 0;
         kprobe_opcode_t *addr = NULL;
         unsigned long *lp;
+        struct kprobe_ctlblk *kcb;
 
-        /* We're in an interrupt, but this is clear and BUG()-safe. */
+        /*
+         * We don't want to be preempted for the entire
+         * duration of kprobe processing
+         */
         preempt_disable();
+        kcb = get_kprobe_ctlblk();
+
         /* Check if the application is using LDT entry for its code segment and
          * calculate the address by reading the base address from the LDT entry.
          */
@@ -173,15 +175,12 @@ static int __kprobes kprobe_handler(struct pt_regs *regs)
         }
         /* Check we're not actually recursing */
         if (kprobe_running()) {
-                /* We *are* holding lock here, so this is safe.
-                   Disarm the probe we just hit, and ignore it. */
                 p = get_kprobe(addr);
                 if (p) {
-                        if (kprobe_status == KPROBE_HIT_SS &&
+                        if (kcb->kprobe_status == KPROBE_HIT_SS &&
                                 *p->ainsn.insn == BREAKPOINT_INSTRUCTION) {
                                 regs->eflags &= ~TF_MASK;
-                                regs->eflags |= kprobe_saved_eflags;
-                                unlock_kprobes();
+                                regs->eflags |= kcb->kprobe_saved_eflags;
                                 goto no_kprobe;
                         }
                         /* We have reentered the kprobe_handler(), since
@@ -190,26 +189,23 @@ static int __kprobes kprobe_handler(struct pt_regs *regs)
                          * just single step on the instruction of the new probe
                          * without calling any user handlers.
                          */
-                        save_previous_kprobe();
-                        set_current_kprobe(p, regs);
+                        save_previous_kprobe(kcb);
+                        set_current_kprobe(p, regs, kcb);
                         p->nmissed++;
                         prepare_singlestep(p, regs);
-                        kprobe_status = KPROBE_REENTER;
+                        kcb->kprobe_status = KPROBE_REENTER;
                         return 1;
                 } else {
-                        p = current_kprobe;
+                        p = __get_cpu_var(current_kprobe);
                         if (p->break_handler && p->break_handler(p, regs)) {
                                 goto ss_probe;
                         }
                 }
-                /* If it's not ours, can't be delete race, (we hold lock). */
                 goto no_kprobe;
         }
 
-        lock_kprobes();
         p = get_kprobe(addr);
         if (!p) {
-                unlock_kprobes();
                 if (regs->eflags & VM_MASK) {
                         /* We are in virtual-8086 mode. Return 0 */
                         goto no_kprobe;
@@ -232,8 +228,8 @@ static int __kprobes kprobe_handler(struct pt_regs *regs)
                 goto no_kprobe;
         }
 
-        kprobe_status = KPROBE_HIT_ACTIVE;
-        set_current_kprobe(p, regs);
+        set_current_kprobe(p, regs, kcb);
+        kcb->kprobe_status = KPROBE_HIT_ACTIVE;
 
         if (p->pre_handler && p->pre_handler(p, regs))
                 /* handler has already set things up, so skip ss setup */
@@ -241,7 +237,7 @@ static int __kprobes kprobe_handler(struct pt_regs *regs)
 
 ss_probe:
         prepare_singlestep(p, regs);
-        kprobe_status = KPROBE_HIT_SS;
+        kcb->kprobe_status = KPROBE_HIT_SS;
         return 1;
 
 no_kprobe:
@@ -269,9 +265,10 @@ int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs)
         struct kretprobe_instance *ri = NULL;
         struct hlist_head *head;
         struct hlist_node *node, *tmp;
-        unsigned long orig_ret_address = 0;
+        unsigned long flags, orig_ret_address = 0;
         unsigned long trampoline_address =(unsigned long)&kretprobe_trampoline;
 
+        spin_lock_irqsave(&kretprobe_lock, flags);
         head = kretprobe_inst_table_head(current);
 
         /*
@@ -310,14 +307,15 @@ int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs)
         BUG_ON(!orig_ret_address || (orig_ret_address == trampoline_address));
         regs->eip = orig_ret_address;
 
-        unlock_kprobes();
+        reset_current_kprobe();
+        spin_unlock_irqrestore(&kretprobe_lock, flags);
         preempt_enable_no_resched();
 
-        /*
-         * By returning a non-zero value, we are telling
-         * kprobe_handler() that we have handled unlocking
-         * and re-enabling preemption.
-         */
+        /*
+         * By returning a non-zero value, we are telling
+         * kprobe_handler() that we don't want the post_handler
+         * to run (and have re-enabled preemption)
+         */
         return 1;
 }
 
@@ -343,7 +341,8 @@ int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs)
  * that is atop the stack is the address following the copied instruction.
  * We need to make it the address following the original instruction.
  */
-static void __kprobes resume_execution(struct kprobe *p, struct pt_regs *regs)
+static void __kprobes resume_execution(struct kprobe *p,
+                struct pt_regs *regs, struct kprobe_ctlblk *kcb)
 {
         unsigned long *tos = (unsigned long *)&regs->esp;
         unsigned long next_eip = 0;
@@ -353,7 +352,7 @@ static void __kprobes resume_execution(struct kprobe *p, struct pt_regs *regs)
         switch (p->ainsn.insn[0]) {
         case 0x9c:              /* pushfl */
                 *tos &= ~(TF_MASK | IF_MASK);
-                *tos |= kprobe_old_eflags;
+                *tos |= kcb->kprobe_old_eflags;
                 break;
         case 0xc3:              /* ret/lret */
         case 0xcb:
@@ -394,27 +393,30 @@ static void __kprobes resume_execution(struct kprobe *p, struct pt_regs *regs)
 
 /*
  * Interrupts are disabled on entry as trap1 is an interrupt gate and they
- * remain disabled thoroughout this function.  And we hold kprobe lock.
+ * remain disabled thoroughout this function.
  */
 static inline int post_kprobe_handler(struct pt_regs *regs)
 {
-        if (!kprobe_running())
+        struct kprobe *cur = kprobe_running();
+        struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
+
+        if (!cur)
                 return 0;
 
-        if ((kprobe_status != KPROBE_REENTER) && current_kprobe->post_handler) {
-                kprobe_status = KPROBE_HIT_SSDONE;
-                current_kprobe->post_handler(current_kprobe, regs, 0);
+        if ((kcb->kprobe_status != KPROBE_REENTER) && cur->post_handler) {
+                kcb->kprobe_status = KPROBE_HIT_SSDONE;
+                cur->post_handler(cur, regs, 0);
         }
 
-        resume_execution(current_kprobe, regs);
-        regs->eflags |= kprobe_saved_eflags;
+        resume_execution(cur, regs, kcb);
+        regs->eflags |= kcb->kprobe_saved_eflags;
 
         /*Restore back the original saved kprobes variables and continue. */
-        if (kprobe_status == KPROBE_REENTER) {
-                restore_previous_kprobe();
+        if (kcb->kprobe_status == KPROBE_REENTER) {
+                restore_previous_kprobe(kcb);
                 goto out;
         }
-        unlock_kprobes();
+        reset_current_kprobe();
 out:
         preempt_enable_no_resched();
 
@@ -429,18 +431,19 @@ out:
         return 1;
 }
 
-/* Interrupts disabled, kprobe_lock held. */
 static inline int kprobe_fault_handler(struct pt_regs *regs, int trapnr)
 {
-        if (current_kprobe->fault_handler
-            && current_kprobe->fault_handler(current_kprobe, regs, trapnr))
+        struct kprobe *cur = kprobe_running();
+        struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
+
+        if (cur->fault_handler && cur->fault_handler(cur, regs, trapnr))
                 return 1;
 
-        if (kprobe_status & KPROBE_HIT_SS) {
-                resume_execution(current_kprobe, regs);
-                regs->eflags |= kprobe_old_eflags;
+        if (kcb->kprobe_status & KPROBE_HIT_SS) {
+                resume_execution(cur, regs, kcb);
+                regs->eflags |= kcb->kprobe_old_eflags;
 
-                unlock_kprobes();
+                reset_current_kprobe();
                 preempt_enable_no_resched();
         }
         return 0;
@@ -453,39 +456,41 @@ int __kprobes kprobe_exceptions_notify(struct notifier_block *self,
                                        unsigned long val, void *data)
 {
         struct die_args *args = (struct die_args *)data;
+        int ret = NOTIFY_DONE;
+
         switch (val) {
         case DIE_INT3:
                 if (kprobe_handler(args->regs))
-                        return NOTIFY_STOP;
+                        ret = NOTIFY_STOP;
                 break;
         case DIE_DEBUG:
                 if (post_kprobe_handler(args->regs))
-                        return NOTIFY_STOP;
+                        ret = NOTIFY_STOP;
                 break;
         case DIE_GPF:
-                if (kprobe_running() &&
-                    kprobe_fault_handler(args->regs, args->trapnr))
-                        return NOTIFY_STOP;
-                break;
         case DIE_PAGE_FAULT:
+                /* kprobe_running() needs smp_processor_id() */
+                preempt_disable();
                 if (kprobe_running() &&
                     kprobe_fault_handler(args->regs, args->trapnr))
-                        return NOTIFY_STOP;
+                        ret = NOTIFY_STOP;
+                preempt_enable();
                 break;
         default:
                 break;
         }
-        return NOTIFY_DONE;
+        return ret;
 }
 
 int __kprobes setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs)
 {
         struct jprobe *jp = container_of(p, struct jprobe, kp);
         unsigned long addr;
+        struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
 
-        jprobe_saved_regs = *regs;
-        jprobe_saved_esp = &regs->esp;
-        addr = (unsigned long)jprobe_saved_esp;
+        kcb->jprobe_saved_regs = *regs;
+        kcb->jprobe_saved_esp = &regs->esp;
+        addr = (unsigned long)(kcb->jprobe_saved_esp);
 
         /*
          * TBD: As Linus pointed out, gcc assumes that the callee
@@ -494,7 +499,8 @@ int __kprobes setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs)
          * we also save and restore enough stack bytes to cover
          * the argument area.
          */
-        memcpy(jprobes_stack, (kprobe_opcode_t *) addr, MIN_STACK_SIZE(addr));
+        memcpy(kcb->jprobes_stack, (kprobe_opcode_t *)addr,
+                        MIN_STACK_SIZE(addr));
         regs->eflags &= ~IF_MASK;
         regs->eip = (unsigned long)(jp->entry);
         return 1;
@@ -502,36 +508,40 @@ int __kprobes setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs)
 
 void __kprobes jprobe_return(void)
 {
-        preempt_enable_no_resched();
+        struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
+
         asm volatile ("       xchgl   %%ebx,%%esp     \n"
                       "       int3                      \n"
                       "       .globl jprobe_return_end  \n"
                       "       jprobe_return_end:        \n"
                       "       nop                       \n"::"b"
-                      (jprobe_saved_esp):"memory");
+                      (kcb->jprobe_saved_esp):"memory");
 }
 
 int __kprobes longjmp_break_handler(struct kprobe *p, struct pt_regs *regs)
 {
+        struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
         u8 *addr = (u8 *) (regs->eip - 1);
-        unsigned long stack_addr = (unsigned long)jprobe_saved_esp;
+        unsigned long stack_addr = (unsigned long)(kcb->jprobe_saved_esp);
         struct jprobe *jp = container_of(p, struct jprobe, kp);
 
         if ((addr > (u8 *) jprobe_return) && (addr < (u8 *) jprobe_return_end)) {
-                if (&regs->esp != jprobe_saved_esp) {
+                if (&regs->esp != kcb->jprobe_saved_esp) {
                         struct pt_regs *saved_regs =
-                            container_of(jprobe_saved_esp, struct pt_regs, esp);
+                            container_of(kcb->jprobe_saved_esp,
+                                            struct pt_regs, esp);
                         printk("current esp %p does not match saved esp %p\n",
-                               &regs->esp, jprobe_saved_esp);
+                               &regs->esp, kcb->jprobe_saved_esp);
                         printk("Saved registers for jprobe %p\n", jp);
                         show_registers(saved_regs);
                         printk("Current registers\n");
                         show_registers(regs);
                         BUG();
                 }
-                *regs = jprobe_saved_regs;
-                memcpy((kprobe_opcode_t *) stack_addr, jprobes_stack,
+                *regs = kcb->jprobe_saved_regs;
+                memcpy((kprobe_opcode_t *) stack_addr, kcb->jprobes_stack,
                        MIN_STACK_SIZE(stack_addr));
+                preempt_enable_no_resched();
                 return 1;
         }
         return 0;
diff --git a/arch/i386/kernel/ldt.c b/arch/i386/kernel/ldt.c
index fe1ffa55587d..983f95707e11 100644
--- a/arch/i386/kernel/ldt.c
+++ b/arch/i386/kernel/ldt.c
@@ -18,6 +18,7 @@
 #include <asm/system.h>
 #include <asm/ldt.h>
 #include <asm/desc.h>
+#include <asm/mmu_context.h>
 
 #ifdef CONFIG_SMP /* avoids "defined but not used" warnig */
 static void flush_ldt(void *null)
diff --git a/arch/i386/kernel/mca.c b/arch/i386/kernel/mca.c
index 8600faeea29d..558bb207720f 100644
--- a/arch/i386/kernel/mca.c
+++ b/arch/i386/kernel/mca.c
@@ -132,7 +132,7 @@ static struct resource mca_standard_resources[] = {
         { .start = 0x100, .end = 0x107, .name = "POS (MCA)" }
 };
 
-#define MCA_STANDARD_RESOURCES  (sizeof(mca_standard_resources)/sizeof(struct resource))
+#define MCA_STANDARD_RESOURCES  ARRAY_SIZE(mca_standard_resources)
 
 /**
  *      mca_read_and_store_pos - read the POS registers into a memory buffer
diff --git a/arch/i386/kernel/process.c b/arch/i386/kernel/process.c
index 7a14fdfd3af9..1cb261f225d5 100644
--- a/arch/i386/kernel/process.c
+++ b/arch/i386/kernel/process.c
@@ -99,14 +99,22 @@ EXPORT_SYMBOL(enable_hlt);
  */
 void default_idle(void)
 {
+        local_irq_enable();
+
         if (!hlt_counter && boot_cpu_data.hlt_works_ok) {
-                local_irq_disable();
-                if (!need_resched())
-                        safe_halt();
-                else
-                        local_irq_enable();
+                clear_thread_flag(TIF_POLLING_NRFLAG);
+                smp_mb__after_clear_bit();
+                while (!need_resched()) {
+                        local_irq_disable();
+                        if (!need_resched())
+                                safe_halt();
+                        else
+                                local_irq_enable();
+                }
+                set_thread_flag(TIF_POLLING_NRFLAG);
         } else {
-                cpu_relax();
+                while (!need_resched())
+                        cpu_relax();
         }
 }
 #ifdef CONFIG_APM_MODULE
@@ -120,29 +128,14 @@ EXPORT_SYMBOL(default_idle);
  */
 static void poll_idle (void)
 {
-        int oldval;
-
         local_irq_enable();
 
-        /*
-         * Deal with another CPU just having chosen a thread to
-         * run here:
-         */
-        oldval = test_and_clear_thread_flag(TIF_NEED_RESCHED);
-
-        if (!oldval) {
-                set_thread_flag(TIF_POLLING_NRFLAG);
-                asm volatile(
-                        "2:"
-                        "testl %0, %1;"
-                        "rep; nop;"
-                        "je 2b;"
-                        : : "i"(_TIF_NEED_RESCHED), "m" (current_thread_info()->flags));
-
-                clear_thread_flag(TIF_POLLING_NRFLAG);
-        } else {
-                set_need_resched();
-        }
+        asm volatile(
+                "2:"
+                "testl %0, %1;"
+                "rep; nop;"
+                "je 2b;"
+                : : "i"(_TIF_NEED_RESCHED), "m" (current_thread_info()->flags));
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
@@ -179,7 +172,9 @@ static inline void play_dead(void)
  */
 void cpu_idle(void)
 {
-        int cpu = raw_smp_processor_id();
+        int cpu = smp_processor_id();
+
+        set_thread_flag(TIF_POLLING_NRFLAG);
 
         /* endless idle loop with no priority at all */
         while (1) {
@@ -201,7 +196,9 @@ void cpu_idle(void)
                         __get_cpu_var(irq_stat).idle_timestamp = jiffies;
                         idle();
                 }
+                preempt_enable_no_resched();
                 schedule();
+                preempt_disable();
         }
 }
 
@@ -244,15 +241,12 @@ static void mwait_idle(void)
 {
         local_irq_enable();
 
-        if (!need_resched()) {
-                set_thread_flag(TIF_POLLING_NRFLAG);
-                do {
-                        __monitor((void *)&current_thread_info()->flags, 0, 0);
-                        if (need_resched())
-                                break;
-                        __mwait(0, 0);
-                } while (!need_resched());
-                clear_thread_flag(TIF_POLLING_NRFLAG);
+        while (!need_resched()) {
+                __monitor((void *)&current_thread_info()->flags, 0, 0);
+                smp_mb();
+                if (need_resched())
+                        break;
+                __mwait(0, 0);
         }
 }
 
diff --git a/arch/i386/kernel/ptrace.c b/arch/i386/kernel/ptrace.c
index efd11f09c996..5ffbb4b7ad05 100644
--- a/arch/i386/kernel/ptrace.c
+++ b/arch/i386/kernel/ptrace.c
@@ -354,49 +354,12 @@ ptrace_set_thread_area(struct task_struct *child,
         return 0;
 }
 
-asmlinkage long sys_ptrace(long request, long pid, long addr, long data)
+long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 {
-        struct task_struct *child;
         struct user * dummy = NULL;
         int i, ret;
         unsigned long __user *datap = (unsigned long __user *)data;
 
-        lock_kernel();
-        ret = -EPERM;
-        if (request == PTRACE_TRACEME) {
-                /* are we already being traced? */
-                if (current->ptrace & PT_PTRACED)
-                        goto out;
-                ret = security_ptrace(current->parent, current);
-                if (ret)
-                        goto out;
-                /* set the ptrace bit in the process flags. */
-                current->ptrace |= PT_PTRACED;
-                ret = 0;
-                goto out;
-        }
-        ret = -ESRCH;
-        read_lock(&tasklist_lock);
-        child = find_task_by_pid(pid);
-        if (child)
-                get_task_struct(child);
-        read_unlock(&tasklist_lock);
-        if (!child)
-                goto out;
-
-        ret = -EPERM;
-        if (pid == 1)           /* you may not mess with init */
-                goto out_tsk;
-
-        if (request == PTRACE_ATTACH) {
-                ret = ptrace_attach(child);
-                goto out_tsk;
-        }
-
-        ret = ptrace_check_attach(child, request == PTRACE_KILL);
-        if (ret < 0)
-                goto out_tsk;
-
         switch (request) {
         /* when I and D space are separate, these will need to be fixed. */
         case PTRACE_PEEKTEXT: /* read word at location addr. */ 
@@ -663,10 +626,7 @@ asmlinkage long sys_ptrace(long request, long pid, long addr, long data)
                 ret = ptrace_request(child, request, addr, data);
                 break;
         }
-out_tsk:
-        put_task_struct(child);
-out:
-        unlock_kernel();
+ out_tsk:
         return ret;
 }
 
diff --git a/arch/i386/kernel/reboot_fixups.c b/arch/i386/kernel/reboot_fixups.c
index c9b87330aeea..10e21a4773dd 100644
--- a/arch/i386/kernel/reboot_fixups.c
+++ b/arch/i386/kernel/reboot_fixups.c
@@ -10,6 +10,7 @@
 
 #include <asm/delay.h>
 #include <linux/pci.h>
+#include <linux/reboot_fixups.h>
 
 static void cs5530a_warm_reset(struct pci_dev *dev)
 {
@@ -42,7 +43,7 @@ void mach_reboot_fixups(void)
         struct pci_dev *dev;
         int i;
 
-        for (i=0; i < (sizeof(fixups_table)/sizeof(fixups_table[0])); i++) {
+        for (i=0; i < ARRAY_SIZE(fixups_table); i++) {
                 cur = &(fixups_table[i]);
                 dev = pci_get_device(cur->vendor, cur->device, NULL);
                 if (!dev)
diff --git a/arch/i386/kernel/scx200.c b/arch/i386/kernel/scx200.c
index 69e203a0d330..9c968ae67c43 100644
--- a/arch/i386/kernel/scx200.c
+++ b/arch/i386/kernel/scx200.c
@@ -12,6 +12,7 @@
 #include <linux/pci.h>
 
 #include <linux/scx200.h>
+#include <linux/scx200_gpio.h>
 
 /* Verify that the configuration block really is there */
 #define scx200_cb_probe(base) (inw((base) + SCx200_CBA) == (base))
diff --git a/arch/i386/kernel/setup.c b/arch/i386/kernel/setup.c
index b48ac635f3c1..fdfcb0cba9b4 100644
--- a/arch/i386/kernel/setup.c
+++ b/arch/i386/kernel/setup.c
@@ -129,9 +129,7 @@ struct drive_info_struct { char dummy[32]; } drive_info;
 EXPORT_SYMBOL(drive_info);
 #endif
 struct screen_info screen_info;
-#ifdef CONFIG_VT
 EXPORT_SYMBOL(screen_info);
-#endif
 struct apm_info apm_info;
 EXPORT_SYMBOL(apm_info);
 struct sys_desc_table_struct {
diff --git a/arch/i386/kernel/smpboot.c b/arch/i386/kernel/smpboot.c
index 01b618e73ecd..bc5a9d97466b 100644
--- a/arch/i386/kernel/smpboot.c
+++ b/arch/i386/kernel/smpboot.c
@@ -68,11 +68,9 @@ EXPORT_SYMBOL(smp_num_siblings);
 
 /* Package ID of each logical CPU */
 int phys_proc_id[NR_CPUS] __read_mostly = {[0 ... NR_CPUS-1] = BAD_APICID};
-EXPORT_SYMBOL(phys_proc_id);
 
 /* Core ID of each logical CPU */
 int cpu_core_id[NR_CPUS] __read_mostly = {[0 ... NR_CPUS-1] = BAD_APICID};
-EXPORT_SYMBOL(cpu_core_id);
 
 cpumask_t cpu_sibling_map[NR_CPUS] __read_mostly;
 EXPORT_SYMBOL(cpu_sibling_map);
@@ -487,6 +485,7 @@ static void __devinit start_secondary(void *unused)
          * things done here to the most necessary things.
          */
         cpu_init();
+        preempt_disable();
         smp_callin();
         while (!cpu_isset(smp_processor_id(), smp_commenced_mask))
                 rep_nop();
@@ -612,7 +611,7 @@ static inline void __inquire_remote_apic(int apicid)
 
         printk("Inquiring remote APIC #%d...\n", apicid);
 
-        for (i = 0; i < sizeof(regs) / sizeof(*regs); i++) {
+        for (i = 0; i < ARRAY_SIZE(regs); i++) {
                 printk("... APIC #%d %s: ", apicid, names[i]);
 
                 /*
diff --git a/arch/i386/oprofile/Kconfig b/arch/i386/oprofile/Kconfig
index 5ade19801b97..d8a84088471a 100644
--- a/arch/i386/oprofile/Kconfig
+++ b/arch/i386/oprofile/Kconfig
@@ -1,7 +1,3 @@
-
-menu "Profiling support"
-        depends on EXPERIMENTAL
-
 config PROFILING
         bool "Profiling support (EXPERIMENTAL)"
         help
@@ -19,5 +15,3 @@ config OPROFILE
 
           If unsure, say N.
 
-endmenu
-
diff --git a/arch/i386/power/cpu.c b/arch/i386/power/cpu.c
index 1f1572692e0b..50a0bef8c85f 100644
--- a/arch/i386/power/cpu.c
+++ b/arch/i386/power/cpu.c
@@ -118,6 +118,7 @@ void __restore_processor_state(struct saved_context *ctxt)
         fix_processor_context();
         do_fpu_end();
         mtrr_ap_init();
+        mcheck_init(&boot_cpu_data);
 }
 
 void restore_processor_state(void)