Merge branch 'linus' into x86/urgent

Merge reason: Needed for include file dependencies.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

41 files changed, 450 insertions, 164 deletions

diff --git a/arch/x86/kernel/acpi/cstate.c b/arch/x86/kernel/acpi/cstate.c
index f50e7fb2a20..d2b7f27781b 100644
--- a/arch/x86/kernel/acpi/cstate.c
+++ b/arch/x86/kernel/acpi/cstate.c
@@ -14,6 +14,7 @@
 #include <acpi/processor.h>
 #include <asm/acpi.h>
 #include <asm/mwait.h>
+#include <asm/special_insns.h>
 
 /*
  * Initialize bm_flags based on the CPU cache properties
diff --git a/arch/x86/kernel/apm_32.c b/arch/x86/kernel/apm_32.c
index 5d56931a15b..459e78cbf61 100644
--- a/arch/x86/kernel/apm_32.c
+++ b/arch/x86/kernel/apm_32.c
@@ -231,7 +231,6 @@
 #include <linux/syscore_ops.h>
 #include <linux/i8253.h>
 
-#include <asm/system.h>
 #include <asm/uaccess.h>
 #include <asm/desc.h>
 #include <asm/olpc.h>
diff --git a/arch/x86/kernel/asm-offsets_64.c b/arch/x86/kernel/asm-offsets_64.c
index 834e897b1e2..1b4754f82ba 100644
--- a/arch/x86/kernel/asm-offsets_64.c
+++ b/arch/x86/kernel/asm-offsets_64.c
@@ -1,6 +1,12 @@
 #include <asm/ia32.h>
 
 #define __SYSCALL_64(nr, sym, compat) [nr] = 1,
+#define __SYSCALL_COMMON(nr, sym, compat) [nr] = 1,
+#ifdef CONFIG_X86_X32_ABI
+# define __SYSCALL_X32(nr, sym, compat) [nr] = 1,
+#else
+# define __SYSCALL_X32(nr, sym, compat) /* nothing */
+#endif
 static char syscalls_64[] = {
 #include <asm/syscalls_64.h>
 };
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index b24032355a7..67e258362a3 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -18,6 +18,7 @@
 #include <asm/archrandom.h>
 #include <asm/hypervisor.h>
 #include <asm/processor.h>
+#include <asm/debugreg.h>
 #include <asm/sections.h>
 #include <linux/topology.h>
 #include <linux/cpumask.h>
diff --git a/arch/x86/kernel/cpu/mcheck/p5.c b/arch/x86/kernel/cpu/mcheck/p5.c
index 5c0e6533d9b..2d5454cd2c4 100644
--- a/arch/x86/kernel/cpu/mcheck/p5.c
+++ b/arch/x86/kernel/cpu/mcheck/p5.c
@@ -9,7 +9,6 @@
 #include <linux/smp.h>
 
 #include <asm/processor.h>
-#include <asm/system.h>
 #include <asm/mce.h>
 #include <asm/msr.h>
 
diff --git a/arch/x86/kernel/cpu/mcheck/therm_throt.c b/arch/x86/kernel/cpu/mcheck/therm_throt.c
index 67bb17a37a0..47a1870279a 100644
--- a/arch/x86/kernel/cpu/mcheck/therm_throt.c
+++ b/arch/x86/kernel/cpu/mcheck/therm_throt.c
@@ -25,7 +25,6 @@
 #include <linux/cpu.h>
 
 #include <asm/processor.h>
-#include <asm/system.h>
 #include <asm/apic.h>
 #include <asm/idle.h>
 #include <asm/mce.h>
diff --git a/arch/x86/kernel/cpu/mcheck/winchip.c b/arch/x86/kernel/cpu/mcheck/winchip.c
index 54060f56597..2d7998fb628 100644
--- a/arch/x86/kernel/cpu/mcheck/winchip.c
+++ b/arch/x86/kernel/cpu/mcheck/winchip.c
@@ -8,7 +8,6 @@
 #include <linux/init.h>
 
 #include <asm/processor.h>
-#include <asm/system.h>
 #include <asm/mce.h>
 #include <asm/msr.h>
 
diff --git a/arch/x86/kernel/cpu/mtrr/generic.c b/arch/x86/kernel/cpu/mtrr/generic.c
index 97b26356e9e..75772ae6c65 100644
--- a/arch/x86/kernel/cpu/mtrr/generic.c
+++ b/arch/x86/kernel/cpu/mtrr/generic.c
@@ -12,7 +12,6 @@
 #include <asm/processor-flags.h>
 #include <asm/cpufeature.h>
 #include <asm/tlbflush.h>
-#include <asm/system.h>
 #include <asm/mtrr.h>
 #include <asm/msr.h>
 #include <asm/pat.h>
diff --git a/arch/x86/kernel/cpu/mtrr/if.c b/arch/x86/kernel/cpu/mtrr/if.c
index 79289632cb2..a041e094b8b 100644
--- a/arch/x86/kernel/cpu/mtrr/if.c
+++ b/arch/x86/kernel/cpu/mtrr/if.c
@@ -167,6 +167,7 @@ mtrr_ioctl(struct file *file, unsigned int cmd, unsigned long __arg)
 {
 	int err = 0;
 	mtrr_type type;
+	unsigned long base;
 	unsigned long size;
 	struct mtrr_sentry sentry;
 	struct mtrr_gentry gentry;
@@ -267,14 +268,14 @@ mtrr_ioctl(struct file *file, unsigned int cmd, unsigned long __arg)
 #endif
 		if (gentry.regnum >= num_var_ranges)
 			return -EINVAL;
-		mtrr_if->get(gentry.regnum, &gentry.base, &size, &type);
+		mtrr_if->get(gentry.regnum, &base, &size, &type);
 
 		/* Hide entries that go above 4GB */
-		if (gentry.base + size - 1 >= (1UL << (8 * sizeof(gentry.size) - PAGE_SHIFT))
+		if (base + size - 1 >= (1UL << (8 * sizeof(gentry.size) - PAGE_SHIFT))
 		    || size >= (1UL << (8 * sizeof(gentry.size) - PAGE_SHIFT)))
 			gentry.base = gentry.size = gentry.type = 0;
 		else {
-			gentry.base <<= PAGE_SHIFT;
+			gentry.base = base << PAGE_SHIFT;
 			gentry.size = size << PAGE_SHIFT;
 			gentry.type = type;
 		}
@@ -321,11 +322,12 @@ mtrr_ioctl(struct file *file, unsigned int cmd, unsigned long __arg)
 #endif
 		if (gentry.regnum >= num_var_ranges)
 			return -EINVAL;
-		mtrr_if->get(gentry.regnum, &gentry.base, &size, &type);
+		mtrr_if->get(gentry.regnum, &base, &size, &type);
 		/* Hide entries that would overflow */
 		if (size != (__typeof__(gentry.size))size)
 			gentry.base = gentry.size = gentry.type = 0;
 		else {
+			gentry.base = base;
 			gentry.size = size;
 			gentry.type = type;
 		}
diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 0a18d16cb58..40883ffe2da 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -29,7 +29,6 @@
 #include <asm/apic.h>
 #include <asm/stacktrace.h>
 #include <asm/nmi.h>
-#include <asm/compat.h>
 #include <asm/smp.h>
 #include <asm/alternative.h>
 #include <asm/timer.h>
@@ -643,14 +642,14 @@ static bool __perf_sched_find_counter(struct perf_sched *sched)
 	/* Prefer fixed purpose counters */
 	if (x86_pmu.num_counters_fixed) {
 		idx = X86_PMC_IDX_FIXED;
-		for_each_set_bit_cont(idx, c->idxmsk, X86_PMC_IDX_MAX) {
+		for_each_set_bit_from(idx, c->idxmsk, X86_PMC_IDX_MAX) {
 			if (!__test_and_set_bit(idx, sched->state.used))
 				goto done;
 		}
 	}
 	/* Grab the first unused counter starting with idx */
 	idx = sched->state.counter;
-	for_each_set_bit_cont(idx, c->idxmsk, X86_PMC_IDX_FIXED) {
+	for_each_set_bit_from(idx, c->idxmsk, X86_PMC_IDX_FIXED) {
 		if (!__test_and_set_bit(idx, sched->state.used))
 			goto done;
 	}
@@ -1748,6 +1747,9 @@ perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs)
 }
 
 #ifdef CONFIG_COMPAT
+
+#include <asm/compat.h>
+
 static inline int
 perf_callchain_user32(struct pt_regs *regs, struct perf_callchain_entry *entry)
 {
diff --git a/arch/x86/kernel/cpuid.c b/arch/x86/kernel/cpuid.c
index a524353d93f..39472dd2323 100644
--- a/arch/x86/kernel/cpuid.c
+++ b/arch/x86/kernel/cpuid.c
@@ -43,7 +43,6 @@
 
 #include <asm/processor.h>
 #include <asm/msr.h>
-#include <asm/system.h>
 
 static struct class *cpuid_class;
 
diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index 90bf130f09b..1b81839b6c8 100644
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -268,7 +268,7 @@ int __kprobes __die(const char *str, struct pt_regs *regs, long err)
 #endif
 	printk("\n");
 	if (notify_die(DIE_OOPS, str, regs, err,
-			current->thread.trap_no, SIGSEGV) == NOTIFY_STOP)
+			current->thread.trap_nr, SIGSEGV) == NOTIFY_STOP)
 		return 1;
 
 	show_registers(regs);
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 734ebd1d3ca..cdc79b5cfcd 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -481,7 +481,12 @@ GLOBAL(system_call_after_swapgs)
 	testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET)
 	jnz tracesys
 system_call_fastpath:
+#if __SYSCALL_MASK == ~0
 	cmpq $__NR_syscall_max,%rax
+#else
+	andl $__SYSCALL_MASK,%eax
+	cmpl $__NR_syscall_max,%eax
+#endif
 	ja badsys
 	movq %r10,%rcx
 	call *sys_call_table(,%rax,8)  # XXX:	 rip relative
@@ -595,7 +600,12 @@ tracesys:
 	 */
 	LOAD_ARGS ARGOFFSET, 1
 	RESTORE_REST
+#if __SYSCALL_MASK == ~0
 	cmpq $__NR_syscall_max,%rax
+#else
+	andl $__SYSCALL_MASK,%eax
+	cmpl $__NR_syscall_max,%eax
+#endif
 	ja   int_ret_from_sys_call	/* RAX(%rsp) set to -ENOSYS above */
 	movq %r10,%rcx	/* fixup for C */
 	call *sys_call_table(,%rax,8)
@@ -735,6 +745,40 @@ ENTRY(stub_rt_sigreturn)
 	CFI_ENDPROC
 END(stub_rt_sigreturn)
 
+#ifdef CONFIG_X86_X32_ABI
+	PTREGSCALL stub_x32_sigaltstack, sys32_sigaltstack, %rdx
+
+ENTRY(stub_x32_rt_sigreturn)
+	CFI_STARTPROC
+	addq $8, %rsp
+	PARTIAL_FRAME 0
+	SAVE_REST
+	movq %rsp,%rdi
+	FIXUP_TOP_OF_STACK %r11
+	call sys32_x32_rt_sigreturn
+	movq %rax,RAX(%rsp) # fixme, this could be done at the higher layer
+	RESTORE_REST
+	jmp int_ret_from_sys_call
+	CFI_ENDPROC
+END(stub_x32_rt_sigreturn)
+
+ENTRY(stub_x32_execve)
+	CFI_STARTPROC
+	addq $8, %rsp
+	PARTIAL_FRAME 0
+	SAVE_REST
+	FIXUP_TOP_OF_STACK %r11
+	movq %rsp, %rcx
+	call sys32_execve
+	RESTORE_TOP_OF_STACK %r11
+	movq %rax,RAX(%rsp)
+	RESTORE_REST
+	jmp int_ret_from_sys_call
+	CFI_ENDPROC
+END(stub_x32_execve)
+
+#endif
+
 /*
  * Build the entry stubs and pointer table with some assembler magic.
  * We pack 7 stubs into a single 32-byte chunk, which will fit in a
diff --git a/arch/x86/kernel/i8259.c b/arch/x86/kernel/i8259.c
index 610485223bd..36d1853e91a 100644
--- a/arch/x86/kernel/i8259.c
+++ b/arch/x86/kernel/i8259.c
@@ -15,7 +15,6 @@
 #include <linux/delay.h>
 
 #include <linux/atomic.h>
-#include <asm/system.h>
 #include <asm/timer.h>
 #include <asm/hw_irq.h>
 #include <asm/pgtable.h>
diff --git a/arch/x86/kernel/irqinit.c b/arch/x86/kernel/irqinit.c
index 313fb5cddbc..252981afd6c 100644
--- a/arch/x86/kernel/irqinit.c
+++ b/arch/x86/kernel/irqinit.c
@@ -16,7 +16,6 @@
 #include <linux/delay.h>
 
 #include <linux/atomic.h>
-#include <asm/system.h>
 #include <asm/timer.h>
 #include <asm/hw_irq.h>
 #include <asm/pgtable.h>
@@ -61,7 +60,7 @@ static irqreturn_t math_error_irq(int cpl, void *dev_id)
 	outb(0, 0xF0);
 	if (ignore_fpu_irq || !boot_cpu_data.hard_math)
 		return IRQ_NONE;
-	math_error(get_irq_regs(), 0, 16);
+	math_error(get_irq_regs(), 0, X86_TRAP_MF);
 	return IRQ_HANDLED;
 }
 
@@ -306,10 +305,10 @@ void __init native_init_IRQ(void)
 	 * us. (some of these will be overridden and become
 	 * 'special' SMP interrupts)
 	 */
-	for (i = FIRST_EXTERNAL_VECTOR; i < NR_VECTORS; i++) {
+	i = FIRST_EXTERNAL_VECTOR;
+	for_each_clear_bit_from(i, used_vectors, NR_VECTORS) {
 		/* IA32_SYSCALL_VECTOR could be used in trap_init already. */
-		if (!test_bit(i, used_vectors))
-			set_intr_gate(i, interrupt[i-FIRST_EXTERNAL_VECTOR]);
+		set_intr_gate(i, interrupt[i - FIRST_EXTERNAL_VECTOR]);
 	}
 
 	if (!acpi_ioapic && !of_ioapic)
diff --git a/arch/x86/kernel/kgdb.c b/arch/x86/kernel/kgdb.c
index faba5771aca..db6720edfdd 100644
--- a/arch/x86/kernel/kgdb.c
+++ b/arch/x86/kernel/kgdb.c
@@ -46,7 +46,6 @@
 
 #include <asm/debugreg.h>
 #include <asm/apicdef.h>
-#include <asm/system.h>
 #include <asm/apic.h>
 #include <asm/nmi.h>
 
@@ -67,8 +66,6 @@ struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] =
 	{ "ss", 4, offsetof(struct pt_regs, ss) },
 	{ "ds", 4, offsetof(struct pt_regs, ds) },
 	{ "es", 4, offsetof(struct pt_regs, es) },
-	{ "fs", 4, -1 },
-	{ "gs", 4, -1 },
 #else
 	{ "ax", 8, offsetof(struct pt_regs, ax) },
 	{ "bx", 8, offsetof(struct pt_regs, bx) },
@@ -90,7 +87,11 @@ struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] =
 	{ "flags", 4, offsetof(struct pt_regs, flags) },
 	{ "cs", 4, offsetof(struct pt_regs, cs) },
 	{ "ss", 4, offsetof(struct pt_regs, ss) },
+	{ "ds", 4, -1 },
+	{ "es", 4, -1 },
 #endif
+	{ "fs", 4, -1 },
+	{ "gs", 4, -1 },
 };
 
 int dbg_set_reg(int regno, void *mem, struct pt_regs *regs)
diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c
index 44842d756b2..f8492da65bf 100644
--- a/arch/x86/kernel/kvmclock.c
+++ b/arch/x86/kernel/kvmclock.c
@@ -136,6 +136,15 @@ int kvm_register_clock(char *txt)
 	return ret;
 }
 
+static void kvm_save_sched_clock_state(void)
+{
+}
+
+static void kvm_restore_sched_clock_state(void)
+{
+	kvm_register_clock("primary cpu clock, resume");
+}
+
 #ifdef CONFIG_X86_LOCAL_APIC
 static void __cpuinit kvm_setup_secondary_clock(void)
 {
@@ -144,8 +153,6 @@ static void __cpuinit kvm_setup_secondary_clock(void)
 	 * we shouldn't fail.
 	 */
 	WARN_ON(kvm_register_clock("secondary cpu clock"));
-	/* ok, done with our trickery, call native */
-	setup_secondary_APIC_clock();
 }
 #endif
 
@@ -194,9 +201,11 @@ void __init kvmclock_init(void)
 	x86_platform.get_wallclock = kvm_get_wallclock;
 	x86_platform.set_wallclock = kvm_set_wallclock;
 #ifdef CONFIG_X86_LOCAL_APIC
-	x86_cpuinit.setup_percpu_clockev =
+	x86_cpuinit.early_percpu_clock_init =
 		kvm_setup_secondary_clock;
 #endif
+	x86_platform.save_sched_clock_state = kvm_save_sched_clock_state;
+	x86_platform.restore_sched_clock_state = kvm_restore_sched_clock_state;
 	machine_ops.shutdown  = kvm_shutdown;
 #ifdef CONFIG_KEXEC
 	machine_ops.crash_shutdown  = kvm_crash_shutdown;
diff --git a/arch/x86/kernel/ldt.c b/arch/x86/kernel/ldt.c
index ea697263b37..ebc98739892 100644
--- a/arch/x86/kernel/ldt.c
+++ b/arch/x86/kernel/ldt.c
@@ -15,7 +15,6 @@
 #include <linux/vmalloc.h>
 #include <linux/uaccess.h>
 
-#include <asm/system.h>
 #include <asm/ldt.h>
 #include <asm/desc.h>
 #include <asm/mmu_context.h>
diff --git a/arch/x86/kernel/machine_kexec_32.c b/arch/x86/kernel/machine_kexec_32.c
index a3fa43ba5d3..5b19e4d78b0 100644
--- a/arch/x86/kernel/machine_kexec_32.c
+++ b/arch/x86/kernel/machine_kexec_32.c
@@ -23,7 +23,6 @@
 #include <asm/apic.h>
 #include <asm/cpufeature.h>
 #include <asm/desc.h>
-#include <asm/system.h>
 #include <asm/cacheflush.h>
 #include <asm/debugreg.h>
 
diff --git a/arch/x86/kernel/mca_32.c b/arch/x86/kernel/mca_32.c
index 177183cbb6a..7eb1e2b9782 100644
--- a/arch/x86/kernel/mca_32.c
+++ b/arch/x86/kernel/mca_32.c
@@ -43,7 +43,6 @@
 #include <linux/mca.h>
 #include <linux/kprobes.h>
 #include <linux/slab.h>
-#include <asm/system.h>
 #include <asm/io.h>
 #include <linux/proc_fs.h>
 #include <linux/mman.h>
diff --git a/arch/x86/kernel/module.c b/arch/x86/kernel/module.c
index 925179f871d..f21fd94ac89 100644
--- a/arch/x86/kernel/module.c
+++ b/arch/x86/kernel/module.c
@@ -26,7 +26,6 @@
 #include <linux/gfp.h>
 #include <linux/jump_label.h>
 
-#include <asm/system.h>
 #include <asm/page.h>
 #include <asm/pgtable.h>
 
diff --git a/arch/x86/kernel/msr.c b/arch/x86/kernel/msr.c
index 96356762a51..eb113693f04 100644
--- a/arch/x86/kernel/msr.c
+++ b/arch/x86/kernel/msr.c
@@ -40,7 +40,6 @@
 
 #include <asm/processor.h>
 #include <asm/msr.h>
-#include <asm/system.h>
 
 static struct class *msr_class;
 
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index ada2f99388d..ab137605e69 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -26,6 +26,7 @@
 
 #include <asm/bug.h>
 #include <asm/paravirt.h>
+#include <asm/debugreg.h>
 #include <asm/desc.h>
 #include <asm/setup.h>
 #include <asm/pgtable.h>
@@ -37,6 +38,7 @@
 #include <asm/apic.h>
 #include <asm/tlbflush.h>
 #include <asm/timer.h>
+#include <asm/special_insns.h>
 
 /* nop stub */
 void _paravirt_nop(void)
diff --git a/arch/x86/kernel/pci-calgary_64.c b/arch/x86/kernel/pci-calgary_64.c
index 726494b5834..6ac5782f4d6 100644
--- a/arch/x86/kernel/pci-calgary_64.c
+++ b/arch/x86/kernel/pci-calgary_64.c
@@ -42,7 +42,6 @@
 #include <asm/calgary.h>
 #include <asm/tce.h>
 #include <asm/pci-direct.h>
-#include <asm/system.h>
 #include <asm/dma.h>
 #include <asm/rio.h>
 #include <asm/bios_ebda.h>
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index 1c4d769e21e..28e5e06fcba 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -262,10 +262,11 @@ rootfs_initcall(pci_iommu_init);
 
 static __devinit void via_no_dac(struct pci_dev *dev)
 {
-	if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI && forbid_dac == 0) {
+	if (forbid_dac == 0) {
 		dev_info(&dev->dev, "disabling DAC on VIA PCI bridge\n");
 		forbid_dac = 1;
 	}
 }
-DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_VIA, PCI_ANY_ID, via_no_dac);
+DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_VENDOR_ID_VIA, PCI_ANY_ID,
+				PCI_CLASS_BRIDGE_PCI, 8, via_no_dac);
 #endif
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 29309c42b9e..a33afaa5ddb 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -18,7 +18,6 @@
 #include <trace/events/power.h>
 #include <linux/hw_breakpoint.h>
 #include <asm/cpu.h>
-#include <asm/system.h>
 #include <asm/apic.h>
 #include <asm/syscalls.h>
 #include <asm/idle.h>
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index ea207c245aa..ae6847303e2 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -38,7 +38,6 @@
 #include <linux/kdebug.h>
 
 #include <asm/pgtable.h>
-#include <asm/system.h>
 #include <asm/ldt.h>
 #include <asm/processor.h>
 #include <asm/i387.h>
@@ -55,6 +54,7 @@
 #include <asm/idle.h>
 #include <asm/syscalls.h>
 #include <asm/debugreg.h>
+#include <asm/switch_to.h>
 
 asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
 
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index ce5e34f2bec..733ca39f367 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -37,7 +37,6 @@
 #include <linux/ftrace.h>
 
 #include <asm/pgtable.h>
-#include <asm/system.h>
 #include <asm/processor.h>
 #include <asm/i387.h>
 #include <asm/fpu-internal.h>
@@ -49,6 +48,7 @@
 #include <asm/idle.h>
 #include <asm/syscalls.h>
 #include <asm/debugreg.h>
+#include <asm/switch_to.h>
 
 asmlinkage extern void ret_from_fork(void);
 
@@ -258,7 +258,9 @@ start_thread(struct pt_regs *regs, unsigned long new_ip, unsigned long new_sp)
 void start_thread_ia32(struct pt_regs *regs, u32 new_ip, u32 new_sp)
 {
 	start_thread_common(regs, new_ip, new_sp,
-			    __USER32_CS, __USER32_DS, __USER32_DS);
+			    test_thread_flag(TIF_X32)
+			    ? __USER_CS : __USER32_CS,
+			    __USER_DS, __USER_DS);
 }
 #endif
 
@@ -381,6 +383,8 @@ void set_personality_64bit(void)
 
 	/* Make sure to be in 64bit mode */
 	clear_thread_flag(TIF_IA32);
+	clear_thread_flag(TIF_ADDR32);
+	clear_thread_flag(TIF_X32);
 
 	/* Ensure the corresponding mm is not marked. */
 	if (current->mm)
@@ -393,20 +397,31 @@ void set_personality_64bit(void)
 	current->personality &= ~READ_IMPLIES_EXEC;
 }
 
-void set_personality_ia32(void)
+void set_personality_ia32(bool x32)
 {
 	/* inherit personality from parent */
 
 	/* Make sure to be in 32bit mode */
-	set_thread_flag(TIF_IA32);
-	current->personality |= force_personality32;
+	set_thread_flag(TIF_ADDR32);
 
 	/* Mark the associated mm as containing 32-bit tasks. */
 	if (current->mm)
 		current->mm->context.ia32_compat = 1;
 
-	/* Prepare the first "return" to user space */
-	current_thread_info()->status |= TS_COMPAT;
+	if (x32) {
+		clear_thread_flag(TIF_IA32);
+		set_thread_flag(TIF_X32);
+		current->personality &= ~READ_IMPLIES_EXEC;
+		/* is_compat_task() uses the presence of the x32
+		   syscall bit flag to determine compat status */
+		current_thread_info()->status &= ~TS_COMPAT;
+	} else {
+		set_thread_flag(TIF_IA32);
+		clear_thread_flag(TIF_X32);
+		current->personality |= force_personality32;
+		/* Prepare the first "return" to user space */
+		current_thread_info()->status |= TS_COMPAT;
+	}
 }
 
 unsigned long get_wchan(struct task_struct *p)
diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index 78f05e438be..685845cf16e 100644
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -24,7 +24,6 @@
 
 #include <asm/uaccess.h>
 #include <asm/pgtable.h>
-#include <asm/system.h>
 #include <asm/processor.h>
 #include <asm/i387.h>
 #include <asm/fpu-internal.h>
@@ -34,6 +33,7 @@
 #include <asm/prctl.h>
 #include <asm/proto.h>
 #include <asm/hw_breakpoint.h>
+#include <asm/traps.h>
 
 #include "tls.h"
 
@@ -1131,6 +1131,100 @@ static int genregs32_set(struct task_struct *target,
 	return ret;
 }
 
+#ifdef CONFIG_X86_X32_ABI
+static long x32_arch_ptrace(struct task_struct *child,
+			    compat_long_t request, compat_ulong_t caddr,
+			    compat_ulong_t cdata)
+{
+	unsigned long addr = caddr;
+	unsigned long data = cdata;
+	void __user *datap = compat_ptr(data);
+	int ret;
+
+	switch (request) {
+	/* Read 32bits at location addr in the USER area.  Only allow
+	   to return the lower 32bits of segment and debug registers.  */
+	case PTRACE_PEEKUSR: {
+		u32 tmp;
+
+		ret = -EIO;
+		if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) ||
+		    addr < offsetof(struct user_regs_struct, cs))
+			break;
+
+		tmp = 0;  /* Default return condition */
+		if (addr < sizeof(struct user_regs_struct))
+			tmp = getreg(child, addr);
+		else if (addr >= offsetof(struct user, u_debugreg[0]) &&
+			 addr <= offsetof(struct user, u_debugreg[7])) {
+			addr -= offsetof(struct user, u_debugreg[0]);
+			tmp = ptrace_get_debugreg(child, addr / sizeof(data));
+		}
+		ret = put_user(tmp, (__u32 __user *)datap);
+		break;
+	}
+
+	/* Write the word at location addr in the USER area.  Only allow
+	   to update segment and debug registers with the upper 32bits
+	   zero-extended. */
+	case PTRACE_POKEUSR:
+		ret = -EIO;
+		if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) ||
+		    addr < offsetof(struct user_regs_struct, cs))
+			break;
+
+		if (addr < sizeof(struct user_regs_struct))
+			ret = putreg(child, addr, data);
+		else if (addr >= offsetof(struct user, u_debugreg[0]) &&
+			 addr <= offsetof(struct user, u_debugreg[7])) {
+			addr -= offsetof(struct user, u_debugreg[0]);
+			ret = ptrace_set_debugreg(child,
+						  addr / sizeof(data), data);
+		}
+		break;
+
+	case PTRACE_GETREGS:	/* Get all gp regs from the child. */
+		return copy_regset_to_user(child,
+					   task_user_regset_view(current),
+					   REGSET_GENERAL,
+					   0, sizeof(struct user_regs_struct),
+					   datap);
+
+	case PTRACE_SETREGS:	/* Set all gp regs in the child. */
+		return copy_regset_from_user(child