Merge branch 'x86/urgent' into core/percpu

Conflicts:
	arch/x86/kernel/acpi/boot.c

24 files changed, 198 insertions, 115 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index d8362cf9909e..b182626739ea 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -937,6 +937,8 @@ and is between 256 and 4096 characters. It is defined in the file
 
 
         intel_iommu=    [DMAR] Intel IOMMU driver (DMAR) option
+                on
+                        Enable intel iommu driver.
                 off
                         Disable intel iommu driver.
                 igfx_off [Default Off]
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index d6218e6c9824..5c8e353c1122 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1806,6 +1806,17 @@ config DMAR
           and include PCI device scope covered by these DMA
           remapping devices.
 
+config DMAR_DEFAULT_ON
+        def_bool n
+        prompt "Enable DMA Remapping Devices by default"
+        depends on DMAR
+        help
+          Selecting this option will enable a DMAR device at boot time if
+          one is found. If this option is not selected, DMAR support can
+          be enabled by passing intel_iommu=on to the kernel. It is
+          recommended you say N here while the DMAR code remains
+          experimental.
+
 config DMAR_GFX_WA
         def_bool y
         prompt "Support for Graphics workaround"
diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
index 8eb50ba9161e..085fef4d8660 100644
--- a/arch/x86/Kconfig.cpu
+++ b/arch/x86/Kconfig.cpu
@@ -167,9 +167,9 @@ config MK7
 config MK8
         bool "Opteron/Athlon64/Hammer/K8"
         help
-          Select this for an AMD Opteron or Athlon64 Hammer-family processor.  Enables
-          use of some extended instructions, and passes appropriate optimization
-          flags to GCC.
+          Select this for an AMD Opteron or Athlon64 Hammer-family processor.
+          Enables use of some extended instructions, and passes appropriate
+          optimization flags to GCC.
 
 config MCRUSOE
         bool "Crusoe"
@@ -256,9 +256,11 @@ config MPSC
 config MCORE2
         bool "Core 2/newer Xeon"
         help
-          Select this for Intel Core 2 and newer Core 2 Xeons (Xeon 51xx and 53xx)
-          CPUs. You can distinguish newer from older Xeons by the CPU family
-          in /proc/cpuinfo. Newer ones have 6 and older ones 15 (not a typo)
+
+          Select this for Intel Core 2 and newer Core 2 Xeons (Xeon 51xx and
+          53xx) CPUs. You can distinguish newer from older Xeons by the CPU
+          family in /proc/cpuinfo. Newer ones have 6 and older ones 15
+          (not a typo)
 
 config GENERIC_CPU
         bool "Generic-x86-64"
@@ -318,14 +320,14 @@ config X86_PPRO_FENCE
         bool "PentiumPro memory ordering errata workaround"
         depends on M686 || M586MMX || M586TSC || M586 || M486 || M386 || MGEODEGX1
         help
-          Old PentiumPro multiprocessor systems had errata that could cause memory
-          operations to violate the x86 ordering standard in rare cases. Enabling this
-          option will attempt to work around some (but not all) occurances of
-          this problem, at the cost of much heavier spinlock and memory barrier
-          operations.
+          Old PentiumPro multiprocessor systems had errata that could cause
+          memory operations to violate the x86 ordering standard in rare cases.
+          Enabling this option will attempt to work around some (but not all)
+          occurances of this problem, at the cost of much heavier spinlock and
+          memory barrier operations.
 
-          If unsure, say n here. Even distro kernels should think twice before enabling
-          this: there are few systems, and an unlikely bug.
+          If unsure, say n here. Even distro kernels should think twice before
+          enabling this: there are few systems, and an unlikely bug.
 
 config X86_F00F_BUG
         def_bool y
diff --git a/arch/x86/include/asm/a.out-core.h b/arch/x86/include/asm/a.out-core.h
index 37822206083e..3c601f8224be 100644
--- a/arch/x86/include/asm/a.out-core.h
+++ b/arch/x86/include/asm/a.out-core.h
@@ -23,8 +23,6 @@
  */
 static inline void aout_dump_thread(struct pt_regs *regs, struct user *dump)
 {
-        u16 gs;
-
 /* changed the size calculations - should hopefully work better. lbt */
         dump->magic = CMAGIC;
         dump->start_code = 0;
@@ -57,7 +55,7 @@ static inline void aout_dump_thread(struct pt_regs *regs, struct user *dump)
         dump->regs.ds = (u16)regs->ds;
         dump->regs.es = (u16)regs->es;
         dump->regs.fs = (u16)regs->fs;
-        savesegment(gs, gs);
+        savesegment(gs, dump->regs.gs);
         dump->regs.orig_ax = regs->orig_ax;
         dump->regs.ip = regs->ip;
         dump->regs.cs = (u16)regs->cs;
diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
index ea408dcba513..7301e60dc4a8 100644
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -93,6 +93,7 @@
 #define X86_FEATURE_XTOPOLOGY   (3*32+22) /* cpu topology enum extensions */
 #define X86_FEATURE_TSC_RELIABLE (3*32+23) /* TSC is known to be reliable */
 #define X86_FEATURE_NONSTOP_TSC (3*32+24) /* TSC does not stop in C states */
+#define X86_FEATURE_CLFLUSH_MONITOR (3*32+25) /* "" clflush reqd with monitor */
 
 /* Intel-defined CPU features, CPUID level 0x00000001 (ecx), word 4 */
 #define X86_FEATURE_XMM3        (4*32+ 0) /* "pni" SSE-3 */
diff --git a/arch/x86/include/asm/math_emu.h b/arch/x86/include/asm/math_emu.h
index 5a65b107ad58..031f6266f425 100644
--- a/arch/x86/include/asm/math_emu.h
+++ b/arch/x86/include/asm/math_emu.h
@@ -1,31 +1,18 @@
 #ifndef _ASM_X86_MATH_EMU_H
 #define _ASM_X86_MATH_EMU_H
 
+#include <asm/ptrace.h>
+#include <asm/vm86.h>
+
 /* This structure matches the layout of the data saved to the stack
    following a device-not-present interrupt, part of it saved
    automatically by the 80386/80486.
    */
-struct info {
+struct math_emu_info {
         long ___orig_eip;
-        long ___ebx;
-        long ___ecx;
-        long ___edx;
-        long ___esi;
-        long ___edi;
-        long ___ebp;
-        long ___eax;
-        long ___ds;
-        long ___es;
-        long ___fs;
-        long ___orig_eax;
-        long ___eip;
-        long ___cs;
-        long ___eflags;
-        long ___esp;
-        long ___ss;
-        long ___vm86_es; /* This and the following only in vm86 mode */
-        long ___vm86_ds;
-        long ___vm86_fs;
-        long ___vm86_gs;
+        union {
+                struct pt_regs *regs;
+                struct kernel_vm86_regs *vm86;
+        };
 };
 #endif /* _ASM_X86_MATH_EMU_H */
diff --git a/arch/x86/include/asm/mpspec.h b/arch/x86/include/asm/mpspec.h
index 62d14ce3cd00..bd22f2a3713f 100644
--- a/arch/x86/include/asm/mpspec.h
+++ b/arch/x86/include/asm/mpspec.h
@@ -60,6 +60,7 @@ extern void mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger,
                                    u32 gsi);
 extern void mp_config_acpi_legacy_irqs(void);
 extern int mp_register_gsi(u32 gsi, int edge_level, int active_high_low);
+extern int acpi_probe_gsi(void);
 #ifdef CONFIG_X86_IO_APIC
 extern int mp_config_acpi_gsi(unsigned char number, unsigned int devfn, u8 pin,
                                 u32 gsi, int triggering, int polarity);
@@ -71,6 +72,11 @@ mp_config_acpi_gsi(unsigned char number, unsigned int devfn, u8 pin,
         return 0;
 }
 #endif
+#else /* !CONFIG_ACPI: */
+static inline int acpi_probe_gsi(void)
+{
+        return 0;
+}
 #endif /* CONFIG_ACPI */
 
 #define PHYSID_ARRAY_SIZE       BITS_TO_LONGS(MAX_APICS)
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 6ceaef08486f..6f7c102018bf 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -316,16 +316,30 @@ static inline pte_t pte_mkspecial(pte_t pte)
 
 extern pteval_t __supported_pte_mask;
 
+/*
+ * Mask out unsupported bits in a present pgprot.  Non-present pgprots
+ * can use those bits for other purposes, so leave them be.
+ */
+static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
+{
+        pgprotval_t protval = pgprot_val(pgprot);
+
+        if (protval & _PAGE_PRESENT)
+                protval &= __supported_pte_mask;
+
+        return protval;
+}
+
 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
 {
-        return __pte((((phys_addr_t)page_nr << PAGE_SHIFT) |
-                      pgprot_val(pgprot)) & __supported_pte_mask);
+        return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
+                     massage_pgprot(pgprot));
 }
 
 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
 {
-        return __pmd((((phys_addr_t)page_nr << PAGE_SHIFT) |
-                      pgprot_val(pgprot)) & __supported_pte_mask);
+        return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
+                     massage_pgprot(pgprot));
 }
 
 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
@@ -337,7 +351,7 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
          * the newprot (if present):
          */
         val &= _PAGE_CHG_MASK;
-        val |= pgprot_val(newprot) & (~_PAGE_CHG_MASK) & __supported_pte_mask;
+        val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
 
         return __pte(val);
 }
@@ -353,7 +367,7 @@ static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
 
 #define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
 
-#define canon_pgprot(p) __pgprot(pgprot_val(p) & __supported_pte_mask)
+#define canon_pgprot(p) __pgprot(massage_pgprot(p))
 
 static inline int is_new_memtype_allowed(unsigned long flags,
                                                 unsigned long new_flags)
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 373d3f628d24..9763eb700138 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -353,7 +353,7 @@ struct i387_soft_struct {
         u8                      no_update;
         u8                      rm;
         u8                      alimit;
-        struct info             *info;
+        struct math_emu_info    *info;
         u32                     entry_eip;
 };
 
diff --git a/arch/x86/include/asm/traps.h b/arch/x86/include/asm/traps.h
index 2ee0a3bceedf..cf3bb053da0b 100644
--- a/arch/x86/include/asm/traps.h
+++ b/arch/x86/include/asm/traps.h
@@ -41,7 +41,7 @@ dotraplinkage void do_int3(struct pt_regs *, long);
 dotraplinkage void do_overflow(struct pt_regs *, long);
 dotraplinkage void do_bounds(struct pt_regs *, long);
 dotraplinkage void do_invalid_op(struct pt_regs *, long);
-dotraplinkage void do_device_not_available(struct pt_regs *, long);
+dotraplinkage void do_device_not_available(struct pt_regs);
 dotraplinkage void do_coprocessor_segment_overrun(struct pt_regs *, long);
 dotraplinkage void do_invalid_TSS(struct pt_regs *, long);
 dotraplinkage void do_segment_not_present(struct pt_regs *, long);
@@ -77,7 +77,7 @@ extern int panic_on_unrecovered_nmi;
 extern int kstack_depth_to_print;
 
 void math_error(void __user *);
-asmlinkage void math_emulate(long);
+void math_emulate(struct math_emu_info *);
 #ifdef CONFIG_X86_32
 unsigned long patch_espfix_desc(unsigned long, unsigned long);
 #else
diff --git a/arch/x86/include/asm/xen/page.h b/arch/x86/include/asm/xen/page.h
index 7ef617ef1df3..4bd990ee43df 100644
--- a/arch/x86/include/asm/xen/page.h
+++ b/arch/x86/include/asm/xen/page.h
@@ -137,7 +137,7 @@ static inline pte_t mfn_pte(unsigned long page_nr, pgprot_t pgprot)
         pte_t pte;
 
         pte.pte = ((phys_addr_t)page_nr << PAGE_SHIFT) |
-                (pgprot_val(pgprot) & __supported_pte_mask);
+                        massage_pgprot(pgprot);
 
         return pte;
 }
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 4cb5964f1499..c193ec3c695e 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -973,6 +973,29 @@ void __init mp_register_ioapic(int id, u32 address, u32 gsi_base)
         nr_ioapics++;
 }
 
+int __init acpi_probe_gsi(void)
+{
+        int idx;
+        int gsi;
+        int max_gsi = 0;
+
+        if (acpi_disabled)
+                return 0;
+
+        if (!acpi_ioapic)
+                return 0;
+
+        max_gsi = 0;
+        for (idx = 0; idx < nr_ioapics; idx++) {
+                gsi = mp_ioapic_routing[idx].gsi_end;
+
+                if (gsi > max_gsi)
+                        max_gsi = gsi;
+        }
+
+        return max_gsi + 1;
+}
+
 static void assign_to_mp_irq(struct mpc_intsrc *m,
                                     struct mpc_intsrc *mp_irq)
 {
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 430e5c38a544..24ff26a38ade 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -291,6 +291,9 @@ static void __cpuinit init_intel(struct cpuinfo_x86 *c)
                 ds_init_intel(c);
         }
 
+        if (c->x86 == 6 && c->x86_model == 29 && cpu_has_clflush)
+                set_cpu_cap(c, X86_FEATURE_CLFLUSH_MONITOR);
+
 #ifdef CONFIG_X86_64
         if (c->x86 == 15)
                 c->x86_cache_alignment = c->x86_clflush_size * 2;
diff --git a/arch/x86/kernel/io_apic.c b/arch/x86/kernel/io_apic.c
index c0498daf01c3..0480d06a12a4 100644
--- a/arch/x86/kernel/io_apic.c
+++ b/arch/x86/kernel/io_apic.c
@@ -3812,14 +3812,24 @@ int __init io_apic_get_redir_entries (int ioapic)
 
 void __init probe_nr_irqs_gsi(void)
 {
-        int idx;
         int nr = 0;
 
-        for (idx = 0; idx < nr_ioapics; idx++)
-                nr += io_apic_get_redir_entries(idx) + 1;
-
-        if (nr > nr_irqs_gsi)
+        nr = acpi_probe_gsi();
+        if (nr > nr_irqs_gsi) {
                 nr_irqs_gsi = nr;
+        } else {
+                /* for acpi=off or acpi is not compiled in */
+                int idx;
+
+                nr = 0;
+                for (idx = 0; idx < nr_ioapics; idx++)
+                        nr += io_apic_get_redir_entries(idx) + 1;
+
+                if (nr > nr_irqs_gsi)
+                        nr_irqs_gsi = nr;
+        }
+
+        printk(KERN_DEBUG "nr_irqs_gsi: %d\n", nr_irqs_gsi);
 }
 
 #ifdef CONFIG_SPARSE_IRQ
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index e68bb9e30864..6d12f7e37f8c 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -180,6 +180,9 @@ void mwait_idle_with_hints(unsigned long ax, unsigned long cx)
 
         trace_power_start(&it, POWER_CSTATE, (ax>>4)+1);
         if (!need_resched()) {
+                if (cpu_has(&current_cpu_data, X86_FEATURE_CLFLUSH_MONITOR))
+                        clflush((void *)&current_thread_info()->flags);
+
                 __monitor((void *)&current_thread_info()->flags, 0, 0);
                 smp_mb();
                 if (!need_resched())
@@ -194,6 +197,9 @@ static void mwait_idle(void)
         struct power_trace it;
         if (!need_resched()) {
                 trace_power_start(&it, POWER_CSTATE, 1);
+                if (cpu_has(&current_cpu_data, X86_FEATURE_CLFLUSH_MONITOR))
+                        clflush((void *)&current_thread_info()->flags);
+
                 __monitor((void *)&current_thread_info()->flags, 0, 0);
                 smp_mb();
                 if (!need_resched())
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index c422eebb0c58..8eb169e45584 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -41,6 +41,7 @@
 #include <linux/uaccess.h>
 #include <linux/io.h>
 #include <linux/ftrace.h>
+#include <linux/dmi.h>
 
 #include <asm/pgtable.h>
 #include <asm/system.h>
@@ -168,14 +169,18 @@ void __show_regs(struct pt_regs *regs, int all)
         unsigned long d0, d1, d2, d3, d6, d7;
         unsigned int fsindex, gsindex;
         unsigned int ds, cs, es;
+        const char *board;
 
         printk("\n");
         print_modules();
-        printk(KERN_INFO "Pid: %d, comm: %.20s %s %s %.*s\n",
+        board = dmi_get_system_info(DMI_PRODUCT_NAME);
+        if (!board)
+                board = "";
+        printk(KERN_INFO "Pid: %d, comm: %.20s %s %s %.*s %s\n",
                 current->pid, current->comm, print_tainted(),
                 init_utsname()->release,
                 (int)strcspn(init_utsname()->version, " "),
-                init_utsname()->version);
+                init_utsname()->version, board);
         printk(KERN_INFO "RIP: %04lx:[<%016lx>] ", regs->cs & 0xffff, regs->ip);
         printk_address(regs->ip, 1);
         printk(KERN_INFO "RSP: %04lx:%016lx  EFLAGS: %08lx\n", regs->ss,
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index f41c4486c270..d5d6693b706d 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -607,7 +607,7 @@ struct x86_quirks *x86_quirks __initdata = &default_x86_quirks;
 static int __init dmi_low_memory_corruption(const struct dmi_system_id *d)
 {
         printk(KERN_NOTICE
-                "%s detected: BIOS may corrupt low RAM, working it around.\n",
+                "%s detected: BIOS may corrupt low RAM, working around it.\n",
                 d->ident);
 
         e820_update_range(0, 0x10000, E820_RAM, E820_RESERVED);
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index ed5aee5f3fcc..3b7b2e190201 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -895,7 +895,7 @@ asmlinkage void math_state_restore(void)
 EXPORT_SYMBOL_GPL(math_state_restore);
 
 #ifndef CONFIG_MATH_EMULATION
-asmlinkage void math_emulate(long arg)
+void math_emulate(struct math_emu_info *info)
 {
         printk(KERN_EMERG
                 "math-emulation not enabled and no coprocessor found.\n");
@@ -905,16 +905,19 @@ asmlinkage void math_emulate(long arg)
 }
 #endif /* CONFIG_MATH_EMULATION */
 
-dotraplinkage void __kprobes
-do_device_not_available(struct pt_regs *regs, long error)
+dotraplinkage void __kprobes do_device_not_available(struct pt_regs regs)
 {
 #ifdef CONFIG_X86_32
         if (read_cr0() & X86_CR0_EM) {
-                conditional_sti(regs);
-                math_emulate(0);
+                struct math_emu_info info = { };
+
+                conditional_sti(&regs);
+
+                info.regs = &regs;
+                math_emulate(&info);
         } else {
                 math_state_restore(); /* interrupts still off */
-                conditional_sti(regs);
+                conditional_sti(&regs);
         }
 #else
         math_state_restore();
diff --git a/arch/x86/kernel/vmi_32.c b/arch/x86/kernel/vmi_32.c
index eb9e7347928e..f052c84ecbe4 100644
--- a/arch/x86/kernel/vmi_32.c
+++ b/arch/x86/kernel/vmi_32.c
@@ -321,6 +321,16 @@ static void vmi_release_pmd(unsigned long pfn)
 }
 
 /*
+ * We use the pgd_free hook for releasing the pgd page:
+ */
+static void vmi_pgd_free(struct mm_struct *mm, pgd_t *pgd)
+{
+        unsigned long pfn = __pa(pgd) >> PAGE_SHIFT;
+
+        vmi_ops.release_page(pfn, VMI_PAGE_L2);
+}
+
+/*
  * Helper macros for MMU update flags.  We can defer updates until a flush
  * or page invalidation only if the update is to the current address space
  * (otherwise, there is no flush).  We must check against init_mm, since
@@ -763,6 +773,7 @@ static inline int __init activate_vmi(void)
         if (vmi_ops.release_page) {
                 pv_mmu_ops.release_pte = vmi_release_pte;
                 pv_mmu_ops.release_pmd = vmi_release_pmd;
+                pv_mmu_ops.pgd_free = vmi_pgd_free;
         }
 
         /* Set linear is needed in all cases */
diff --git a/arch/x86/math-emu/fpu_entry.c b/arch/x86/math-emu/fpu_entry.c
index c7b06feb139b..5d87f586f8d7 100644
--- a/arch/x86/math-emu/fpu_entry.c
+++ b/arch/x86/math-emu/fpu_entry.c
@@ -131,7 +131,7 @@ u_char emulating = 0;
 static int valid_prefix(u_char *Byte, u_char __user ** fpu_eip,
                         overrides * override);
 
-asmlinkage void math_emulate(long arg)
+void math_emulate(struct math_emu_info *info)
 {
         u_char FPU_modrm, byte1;
         unsigned short code;
@@ -161,7 +161,7 @@ asmlinkage void math_emulate(long arg)
         RE_ENTRANT_CHECK_ON;
 #endif /* RE_ENTRANT_CHECKING */
 
-        SETUP_DATA_AREA(arg);
+        FPU_info = info;
 
         FPU_ORIG_EIP = FPU_EIP;
 
@@ -659,7 +659,7 @@ static int valid_prefix(u_char *Byte, u_char __user **fpu_eip,
         }
 }
 
-void math_abort(struct info *info, unsigned int signal)
+void math_abort(struct math_emu_info *info, unsigned int signal)
 {
         FPU_EIP = FPU_ORIG_EIP;
         current->thread.trap_no = 16;
diff --git a/arch/x86/math-emu/fpu_proto.h b/arch/x86/math-emu/fpu_proto.h
index aa49b6a0d850..9779df436b7d 100644
--- a/arch/x86/math-emu/fpu_proto.h
+++ b/arch/x86/math-emu/fpu_proto.h
@@ -51,8 +51,8 @@ extern void ffreep(void);
 extern void fst_i_(void);
 extern void fstp_i(void);
 /* fpu_entry.c */
-asmlinkage extern void math_emulate(long arg);
-extern void math_abort(struct info *info, unsigned int signal);
+extern void math_emulate(struct math_emu_info *info);
+extern void math_abort(struct math_emu_info *info, unsigned int signal);
 /* fpu_etc.c */
 extern void FPU_etc(void);
 /* fpu_tags.c */
diff --git a/arch/x86/math-emu/fpu_system.h b/arch/x86/math-emu/fpu_system.h
index 13488fa153e0..50fa0ec2c8a5 100644
--- a/arch/x86/math-emu/fpu_system.h
+++ b/arch/x86/math-emu/fpu_system.h
@@ -16,10 +16,6 @@
 #include <linux/kernel.h>
 #include <linux/mm.h>
 
-/* This sets the pointer FPU_info to point to the argument part
-   of the stack frame of math_emulate() */
-#define SETUP_DATA_AREA(arg)    FPU_info = (struct info *) &arg
-
 /* s is always from a cpu register, and the cpu does bounds checking
  * during register load --> no further bounds checks needed */
 #define LDT_DESCRIPTOR(s)       (((struct desc_struct *)current->mm->context.ldt)[(s) >> 3])
@@ -38,12 +34,12 @@
 #define I387                    (current->thread.xstate)
 #define FPU_info                (I387->soft.info)
 
-#define FPU_CS                  (*(unsigned short *) &(FPU_info->___cs))
-#define FPU_SS                  (*(unsigned short *) &(FPU_info->___ss))
-#define FPU_DS                  (*(unsigned short *) &(FPU_info->___ds))
-#define FPU_EAX                 (FPU_info->___eax)
-#define FPU_EFLAGS              (FPU_info->___eflags)
-#define FPU_EIP                 (FPU_info->___eip)
+#define FPU_CS                  (*(unsigned short *) &(FPU_info->regs->cs))
+#define FPU_SS                  (*(unsigned short *) &(FPU_info->regs->ss))
+#define FPU_DS                  (*(unsigned short *) &(FPU_info->regs->ds))
+#define FPU_EAX                 (FPU_info->regs->ax)
+#define FPU_EFLAGS              (FPU_info->regs->flags)
+#define FPU_EIP                 (FPU_info->regs->ip)
 #define FPU_ORIG_EIP            (FPU_info->___orig_eip)
 
 #define FPU_lookahead           (I387->soft.lookahead)
diff --git a/arch/x86/math-emu/get_address.c b/arch/x86/math-emu/get_address.c
index d701e2b39e44..420b3b6e3915 100644
--- a/arch/x86/math-emu/get_address.c
+++ b/arch/x86/math-emu/get_address.c
@@ -29,46 +29,43 @@
 #define FPU_WRITE_BIT 0x10
 
 static int reg_offset[] = {
-        offsetof(struct info, ___eax),
-        offsetof(struct info, ___ecx),
-        offsetof(struct info, ___edx),
-        offsetof(struct info, ___ebx),
-        offsetof(struct info, ___esp),
-        offsetof(struct info, ___ebp),
-        offsetof(struct info, ___esi),
-        offsetof(struct info, ___edi)
+        offsetof(struct pt_regs, ax),
+        offsetof(struct pt_regs, cx),
+        offsetof(struct pt_regs, dx),
+        offsetof(struct pt_regs, bx),
+        offsetof(struct pt_regs, sp),
+        offsetof(struct pt_regs, bp),
+        offsetof(struct pt_regs, si),
+        offsetof(struct pt_regs, di)
 };
 
-#define REG_(x) (*(long *)(reg_offset[(x)]+(u_char *) FPU_info))
+#define REG_(x) (*(long *)(reg_offset[(x)] + (u_char *)FPU_info->regs))
 
 static int reg_offset_vm86[] = {
-        offsetof(struct info, ___cs),
-        offsetof(struct info, ___vm86_ds),
-        offsetof(struct info, ___vm86_es),
-        offsetof(struct info, ___vm86_fs),
-        offsetof(struct info, ___vm86_gs),
-        offsetof(struct info, ___ss),
-        offsetof(struct info, ___vm86_ds)
+        offsetof(struct pt_regs, cs),
+        offsetof(struct kernel_vm86_regs, ds),
+        offsetof(struct kernel_vm86_regs, es),
+        offsetof(struct kernel_vm86_regs, fs),
+        offsetof(struct kernel_vm86_regs, gs),
+        offsetof(struct pt_regs, ss),
+        offsetof(struct kernel_vm86_regs, ds)
 };
 
 #define VM86_REG_(x) (*(unsigned short *) \
-                      (reg_offset_vm86[((unsigned)x)]+(u_char *) FPU_info))
-
-/* This dummy, gs is not saved on the stack. */
-#define ___GS ___ds
+                (reg_offset_vm86[((unsigned)x)] + (u_char *)FPU_info->regs))
 
 static int reg_offset_pm[] = {
-        offsetof(struct info, ___cs),
-        offsetof(struct info, ___ds),
-        offsetof(struct info, ___es),
-        offsetof(struct info, ___fs),
-        offsetof(struct info, ___GS),
-        offsetof(struct info, ___ss),
-        offsetof(struct info, ___ds)
+        offsetof(struct pt_regs, cs),
+        offsetof(struct pt_regs, ds),
+        offsetof(struct pt_regs, es),
+        offsetof(struct pt_regs, fs),
+        offsetof(struct pt_regs, ds),   /* dummy, not saved on stack */
+        offsetof(struct pt_regs, ss),
+        offsetof(struct pt_regs, ds)
 };
 
 #define PM_REG_(x) (*(unsigned short *) \
-                      (reg_offset_pm[((unsigned)x)]+(u_char *) FPU_info))
+                (reg_offset_pm[((unsigned)x)] + (u_char *)FPU_info->regs))
 
 /* Decode the SIB byte. This function assumes mod != 0 */
 static int sib(int mod, unsigned long *fpu_eip)
@@ -349,34 +346,34 @@ void __user *FPU_get_address_16(u_char FPU_modrm, unsigned long *fpu_eip,
         }
         switch (rm) {
         case 0:
-                address += FPU_info->___ebx + FPU_info->___esi;
+                address += FPU_info->regs->bx + FPU_info->regs->si;
                 break;
         case 1:
-                address += FPU_info->___ebx + FPU_info->___edi;
+                address += FPU_info->regs->bx + FPU_info->regs->di;
                 break;
         case 2:
-                address += FPU_info->___ebp + FPU_info->___esi;
+                address += FPU_info->regs->bp + FPU_info->regs->si;
                 if (addr_modes.override.segment == PREFIX_DEFAULT)
                         addr_modes.override.segment = PREFIX_SS_;
                 break;
         case 3:
-                address += FPU_info->___ebp + FPU_info->___edi;
+                address += FPU_info->regs->bp + FPU_info->regs->di;
                 if (addr_modes.override.segment == PREFIX_DEFAULT)
                         addr_modes.override.segment = PREFIX_SS_;
                 break;
         case 4:
-                address += FPU_info->___esi;
+                address += FPU_info->regs->si;
                 break;
         case 5:
-                address += FPU_info->___edi;
+                address += FPU_info->regs->di;
                 break;
         case 6:
-                address += FPU_info->___ebp;
+                address += FPU_info->regs->bp;
                 if (addr_modes.override.segment == PREFIX_DEFAULT)
                         addr_modes.override.segment = PREFIX_SS_;
                 break;
         case 7:
-                address += FPU_info->___ebx;
+                address += FPU_info->regs->bx;
                 break;
         }
 
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 3dfecb20d5e7..f4b7c79023ff 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -268,7 +268,12 @@ static long list_size;
 
 static void domain_remove_dev_info(struct dmar_domain *domain);
 
-int dmar_disabled;
+#ifdef CONFIG_DMAR_DEFAULT_ON
+int dmar_disabled = 0;
+#else
+int dmar_disabled = 1;
+#endif /*CONFIG_DMAR_DEFAULT_ON*/
+
 static int __initdata dmar_map_gfx = 1;
 static int dmar_forcedac;
 static int intel_iommu_strict;
@@ -284,9 +289,12 @@ static int __init intel_iommu_setup(char *str)
         if (!str)
                 return -EINVAL;
         while (*str) {
-                if (!strncmp(str, "off", 3)) {
+                if (!strncmp(str, "on", 2)) {
+                        dmar_disabled = 0;
+                        printk(KERN_INFO "Intel-IOMMU: enabled\n");
+                } else if (!strncmp(str, "off", 3)) {
                         dmar_disabled = 1;
-                        printk(KERN_INFO"Intel-IOMMU: disabled\n");
+                        printk(KERN_INFO "Intel-IOMMU: disabled\n");
                 } else if (!strncmp(str, "igfx_off", 8)) {
                         dmar_map_gfx = 0;
                         printk(KERN_INFO