Merge branch 'master' into upstream-fixes

18 files changed, 114 insertions, 95 deletions

diff --git a/arch/mips/kernel/asm-offsets.c b/arch/mips/kernel/asm-offsets.c
index ec28077d5ee2..e9ce5b3721af 100644
--- a/arch/mips/kernel/asm-offsets.c
+++ b/arch/mips/kernel/asm-offsets.c
@@ -93,11 +93,12 @@ void output_thread_info_defines(void)
         offset("#define TI_TASK            ", struct thread_info, task);
         offset("#define TI_EXEC_DOMAIN     ", struct thread_info, exec_domain);
         offset("#define TI_FLAGS           ", struct thread_info, flags);
+        offset("#define TI_TP_VALUE        ", struct thread_info, tp_value);
         offset("#define TI_CPU             ", struct thread_info, cpu);
         offset("#define TI_PRE_COUNT       ", struct thread_info, preempt_count);
         offset("#define TI_ADDR_LIMIT      ", struct thread_info, addr_limit);
         offset("#define TI_RESTART_BLOCK   ", struct thread_info, restart_block);
-        offset("#define TI_TP_VALUE        ", struct thread_info, tp_value);
+        offset("#define TI_REGS            ", struct thread_info, regs);
         constant("#define _THREAD_SIZE_ORDER ", THREAD_SIZE_ORDER);
         constant("#define _THREAD_SIZE       ", THREAD_SIZE);
         constant("#define _THREAD_MASK       ", THREAD_MASK);
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index 9fbf8430c849..8485af340ee1 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -135,7 +135,6 @@ static inline void check_wait(void)
         case CPU_R5000:
         case CPU_NEVADA:
         case CPU_RM7000:
-        case CPU_RM9000:
         case CPU_4KC:
         case CPU_4KEC:
         case CPU_4KSC:
@@ -164,6 +163,14 @@ static inline void check_wait(void)
                 } else
                         printk(" unavailable.\n");
                 break;
+        case CPU_RM9000:
+                if ((c->processor_id & 0x00ff) >= 0x40) {
+                        cpu_wait = r4k_wait;
+                        printk(" available.\n");
+                } else {
+                        printk(" unavailable.\n");
+                }
+                break;
         default:
                 printk(" unavailable.\n");
                 break;
diff --git a/arch/mips/kernel/entry.S b/arch/mips/kernel/entry.S
index 766655f35250..417c08ac76eb 100644
--- a/arch/mips/kernel/entry.S
+++ b/arch/mips/kernel/entry.S
@@ -20,10 +20,7 @@
 #include <asm/mipsmtregs.h>
 #endif
 
-#ifdef CONFIG_PREEMPT
-        .macro  preempt_stop
-        .endm
-#else
+#ifndef CONFIG_PREEMPT
         .macro  preempt_stop
         local_irq_disable
         .endm
@@ -32,9 +29,16 @@
 
         .text
         .align  5
+FEXPORT(ret_from_irq)
+        LONG_S  s0, TI_REGS($28)
+#ifdef CONFIG_PREEMPT
+FEXPORT(ret_from_exception)
+#else
+        b       _ret_from_irq
 FEXPORT(ret_from_exception)
         preempt_stop
-FEXPORT(ret_from_irq)
+#endif
+FEXPORT(_ret_from_irq)
         LONG_L  t0, PT_STATUS(sp)               # returning to kernel mode?
         andi    t0, t0, KU_USER
         beqz    t0, resume_kernel
@@ -79,7 +83,6 @@ FEXPORT(syscall_exit)
 FEXPORT(restore_all)                    # restore full frame
 #ifdef CONFIG_MIPS_MT_SMTC
 /* Detect and execute deferred IPI "interrupts" */
-        move    a0,sp
         jal     deferred_smtc_ipi
 /* Re-arm any temporarily masked interrupts not explicitly "acked" */
         mfc0    v0, CP0_TCSTATUS
diff --git a/arch/mips/kernel/genex.S b/arch/mips/kernel/genex.S
index af6ef2fd8300..5baca16993d0 100644
--- a/arch/mips/kernel/genex.S
+++ b/arch/mips/kernel/genex.S
@@ -131,8 +131,9 @@ NESTED(handle_int, PT_SIZE, sp)
         CLI
         TRACE_IRQS_OFF
 
+        LONG_L  s0, TI_REGS($28)
+        LONG_S  sp, TI_REGS($28)
         PTR_LA  ra, ret_from_irq
-        move    a0, sp
         j       plat_irq_dispatch
         END(handle_int)
 
@@ -219,7 +220,9 @@ NESTED(except_vec_vi_handler, 0, sp)
 #endif /* CONFIG_MIPS_MT_SMTC */
         CLI
         TRACE_IRQS_OFF
-        move    a0, sp
+
+        LONG_L  s0, TI_REGS($28)
+        LONG_S  sp, TI_REGS($28)
         PTR_LA  ra, ret_from_irq
         jr      v0
         END(except_vec_vi_handler)
diff --git a/arch/mips/kernel/irq-msc01.c b/arch/mips/kernel/irq-msc01.c
index 63dfeb41796b..650a80ca3741 100644
--- a/arch/mips/kernel/irq-msc01.c
+++ b/arch/mips/kernel/irq-msc01.c
@@ -1,16 +1,17 @@
 /*
- * Copyright (c) 2004 MIPS Inc
- * Author: chris@mips.com
- *
  * This program is free software; you can redistribute  it and/or modify it
  * under  the terms of  the GNU General  Public License as published by the
  * Free Software Foundation;  either version 2 of the  License, or (at your
  * option) any later version.
+ *
+ * Copyright (c) 2004 MIPS Inc
+ * Author: chris@mips.com
+ *
+ * Copyright (C) 2004, 06 Ralf Baechle <ralf@linux-mips.org>
  */
 #include <linux/module.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
-#include <asm/ptrace.h>
 #include <linux/sched.h>
 #include <linux/kernel_stat.h>
 #include <asm/io.h>
@@ -115,14 +116,14 @@ static void end_msc_irq(unsigned int irq)
 /*
  * Interrupt handler for interrupts coming from SOC-it.
  */
-void ll_msc_irq(struct pt_regs *regs)
+void ll_msc_irq(void)
 {
         unsigned int irq;
 
         /* read the interrupt vector register */
         MSCIC_READ(MSC01_IC_VEC, irq);
         if (irq < 64)
-                do_IRQ(irq + irq_base, regs);
+                do_IRQ(irq + irq_base);
         else {
                 /* Ignore spurious interrupt */
         }
diff --git a/arch/mips/kernel/irq-mv6434x.c b/arch/mips/kernel/irq-mv6434x.c
index b117e64da64d..37d106202b83 100644
--- a/arch/mips/kernel/irq-mv6434x.c
+++ b/arch/mips/kernel/irq-mv6434x.c
@@ -1,7 +1,7 @@
 /*
  * Copyright 2002 Momentum Computer
  * Author: mdharm@momenco.com
- * Copyright (C) 2004 Ralf Baechle <ralf@linux-mips.org>
+ * Copyright (C) 2004, 06 Ralf Baechle <ralf@linux-mips.org>
  *
  * This program is free software; you can redistribute  it and/or modify it
  * under  the terms of  the GNU General  Public License as published by the
@@ -15,7 +15,6 @@
 #include <linux/mv643xx.h>
 #include <linux/sched.h>
 
-#include <asm/ptrace.h>
 #include <asm/io.h>
 #include <asm/irq.h>
 #include <asm/marvell.h>
@@ -113,7 +112,7 @@ static void end_mv64340_irq(unsigned int irq)
  * Interrupt handler for interrupts coming from the Marvell chip.
  * It could be built in ethernet ports etc...
  */
-void ll_mv64340_irq(struct pt_regs *regs)
+void ll_mv64340_irq(void)
 {
         unsigned int irq_src_low, irq_src_high;
         unsigned int irq_mask_low, irq_mask_high;
@@ -129,9 +128,9 @@ void ll_mv64340_irq(struct pt_regs *regs)
         irq_src_high &= irq_mask_high;
 
         if (irq_src_low)
-                do_IRQ(ls1bit32(irq_src_low) + irq_base, regs);
+                do_IRQ(ls1bit32(irq_src_low) + irq_base);
         else
-                do_IRQ(ls1bit32(irq_src_high) + irq_base + 32, regs);
+                do_IRQ(ls1bit32(irq_src_high) + irq_base + 32);
 }
 
 #define shutdown_mv64340_irq    disable_mv64340_irq
diff --git a/arch/mips/kernel/irq.c b/arch/mips/kernel/irq.c
index d955aaefbb8e..dd24434392b6 100644
--- a/arch/mips/kernel/irq.c
+++ b/arch/mips/kernel/irq.c
@@ -53,12 +53,12 @@ unsigned long irq_hwmask[NR_IRQS];
  * SMP cross-CPU interrupts have their own specific
  * handlers).
  */
-asmlinkage unsigned int do_IRQ(unsigned int irq, struct pt_regs *regs)
+asmlinkage unsigned int do_IRQ(unsigned int irq)
 {
         irq_enter();
 
         __DO_IRQ_SMTC_HOOK();
-        __do_IRQ(irq, regs);
+        __do_IRQ(irq);
 
         irq_exit();
 
@@ -110,7 +110,7 @@ skip:
         return 0;
 }
 
-asmlinkage void spurious_interrupt(struct pt_regs *regs)
+asmlinkage void spurious_interrupt(void)
 {
         atomic_inc(&irq_err_count);
 }
diff --git a/arch/mips/kernel/proc.c b/arch/mips/kernel/proc.c
index d8beef107902..4ed37ba19731 100644
--- a/arch/mips/kernel/proc.c
+++ b/arch/mips/kernel/proc.c
@@ -89,9 +89,9 @@ static const char *cpu_name[] = {
 
 static int show_cpuinfo(struct seq_file *m, void *v)
 {
-        unsigned int version = current_cpu_data.processor_id;
-        unsigned int fp_vers = current_cpu_data.fpu_id;
         unsigned long n = (unsigned long) v - 1;
+        unsigned int version = cpu_data[n].processor_id;
+        unsigned int fp_vers = cpu_data[n].fpu_id;
         char fmt [64];
 
 #ifdef CONFIG_SMP
@@ -107,9 +107,9 @@ static int show_cpuinfo(struct seq_file *m, void *v)
 
         seq_printf(m, "processor\t\t: %ld\n", n);
         sprintf(fmt, "cpu model\t\t: %%s V%%d.%%d%s\n",
-                cpu_has_fpu ? "  FPU V%d.%d" : "");
-        seq_printf(m, fmt, cpu_name[current_cpu_data.cputype <= CPU_LAST ?
-                                    current_cpu_data.cputype : CPU_UNKNOWN],
+                cpu_data[n].options & MIPS_CPU_FPU ? "  FPU V%d.%d" : "");
+        seq_printf(m, fmt, cpu_name[cpu_data[n].cputype <= CPU_LAST ?
+                                    cpu_data[n].cputype : CPU_UNKNOWN],
                                    (version >> 4) & 0x0f, version & 0x0f,
                                    (fp_vers >> 4) & 0x0f, fp_vers & 0x0f);
         seq_printf(m, "BogoMIPS\t\t: %lu.%02lu\n",
@@ -118,7 +118,7 @@ static int show_cpuinfo(struct seq_file *m, void *v)
         seq_printf(m, "wait instruction\t: %s\n", cpu_wait ? "yes" : "no");
         seq_printf(m, "microsecond timers\t: %s\n",
                       cpu_has_counter ? "yes" : "no");
-        seq_printf(m, "tlb_entries\t\t: %d\n", current_cpu_data.tlbsize);
+        seq_printf(m, "tlb_entries\t\t: %d\n", cpu_data[n].tlbsize);
         seq_printf(m, "extra interrupt vector\t: %s\n",
                       cpu_has_divec ? "yes" : "no");
         seq_printf(m, "hardware watchpoint\t: %s\n",
diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index 045d987bc683..9f307eb1a31e 100644
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -115,7 +115,7 @@ void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp)
         status |= KU_USER;
         regs->cp0_status = status;
         clear_used_math();
-        lose_fpu();
+        clear_fpu_owner();
         if (cpu_has_dsp)
                 __init_dsp();
         regs->cp0_epc = pc;
diff --git a/arch/mips/kernel/ptrace.c b/arch/mips/kernel/ptrace.c
index 362d1728e531..258d74fd0b63 100644
--- a/arch/mips/kernel/ptrace.c
+++ b/arch/mips/kernel/ptrace.c
@@ -106,6 +106,7 @@ int ptrace_setregs (struct task_struct *child, __s64 __user *data)
 int ptrace_getfpregs (struct task_struct *child, __u32 __user *data)
 {
         int i;
+        unsigned int tmp;
 
         if (!access_ok(VERIFY_WRITE, data, 33 * 8))
                 return -EIO;
@@ -121,10 +122,10 @@ int ptrace_getfpregs (struct task_struct *child, __u32 __user *data)
 
         __put_user (child->thread.fpu.fcr31, data + 64);
 
+        preempt_disable();
         if (cpu_has_fpu) {
-                unsigned int flags, tmp;
+                unsigned int flags;
 
-                preempt_disable();
                 if (cpu_has_mipsmt) {
                         unsigned int vpflags = dvpe();
                         flags = read_c0_status();
@@ -138,11 +139,11 @@ int ptrace_getfpregs (struct task_struct *child, __u32 __user *data)
                         __asm__ __volatile__("cfc1\t%0,$0" : "=r" (tmp));
                         write_c0_status(flags);
                 }
-                preempt_enable();
-                __put_user (tmp, data + 65);
         } else {
-                __put_user ((__u32) 0, data + 65);
+                tmp = 0;
         }
+        preempt_enable();
+        __put_user (tmp, data + 65);
 
         return 0;
 }
@@ -245,16 +246,17 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
                         unsigned int mtflags;
 #endif /* CONFIG_MIPS_MT_SMTC */
 
-                        if (!cpu_has_fpu)
+                        preempt_disable();
+                        if (!cpu_has_fpu) {
+                                preempt_enable();
                                 break;
+                        }
 
 #ifdef CONFIG_MIPS_MT_SMTC
                         /* Read-modify-write of Status must be atomic */
                         local_irq_save(irqflags);
                         mtflags = dmt();
 #endif /* CONFIG_MIPS_MT_SMTC */
-
-                        preempt_disable();
                         if (cpu_has_mipsmt) {
                                 unsigned int vpflags = dvpe();
                                 flags = read_c0_status();
diff --git a/arch/mips/kernel/ptrace32.c b/arch/mips/kernel/ptrace32.c
index f40ecd8be05f..d9a39c169450 100644
--- a/arch/mips/kernel/ptrace32.c
+++ b/arch/mips/kernel/ptrace32.c
@@ -175,7 +175,9 @@ asmlinkage int sys32_ptrace(int request, int pid, int addr, int data)
                         unsigned int mtflags;
 #endif /* CONFIG_MIPS_MT_SMTC */
 
+                        preempt_disable();
                         if (!cpu_has_fpu) {
+                                preempt_enable();
                                 tmp = 0;
                                 break;
                         }
@@ -186,7 +188,6 @@ asmlinkage int sys32_ptrace(int request, int pid, int addr, int data)
                         mtflags = dmt();
 #endif /* CONFIG_MIPS_MT_SMTC */
 
-                        preempt_disable();
                         if (cpu_has_mipsmt) {
                                 unsigned int vpflags = dvpe();
                                 flags = read_c0_status();
diff --git a/arch/mips/kernel/rtlx.c b/arch/mips/kernel/rtlx.c
index cdab1b2cd134..8c8c8324f775 100644
--- a/arch/mips/kernel/rtlx.c
+++ b/arch/mips/kernel/rtlx.c
@@ -61,16 +61,16 @@ static int sp_stopping = 0;
 
 extern void *vpe_get_shared(int index);
 
-static void rtlx_dispatch(struct pt_regs *regs)
+static void rtlx_dispatch(void)
 {
-        do_IRQ(MIPSCPU_INT_BASE + MIPS_CPU_RTLX_IRQ, regs);
+        do_IRQ(MIPSCPU_INT_BASE + MIPS_CPU_RTLX_IRQ);
 }
 
 
 /* Interrupt handler may be called before rtlx_init has otherwise had
    a chance to run.
 */
-static irqreturn_t rtlx_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t rtlx_interrupt(int irq, void *dev_id)
 {
         int i;
 
diff --git a/arch/mips/kernel/smp-mt.c b/arch/mips/kernel/smp-mt.c
index 766253c44f3f..3b5f3b632622 100644
--- a/arch/mips/kernel/smp-mt.c
+++ b/arch/mips/kernel/smp-mt.c
@@ -106,22 +106,22 @@ void __init sanitize_tlb_entries(void)
         clear_c0_mvpcontrol(MVPCONTROL_VPC);
 }
 
-static void ipi_resched_dispatch (struct pt_regs *regs)
+static void ipi_resched_dispatch(void)
 {
-        do_IRQ(MIPSCPU_INT_BASE + MIPS_CPU_IPI_RESCHED_IRQ, regs);
+        do_IRQ(MIPSCPU_INT_BASE + MIPS_CPU_IPI_RESCHED_IRQ);
 }
 
-static void ipi_call_dispatch (struct pt_regs *regs)
+static void ipi_call_dispatch(void)
 {
-        do_IRQ(MIPSCPU_INT_BASE + MIPS_CPU_IPI_CALL_IRQ, regs);
+        do_IRQ(MIPSCPU_INT_BASE + MIPS_CPU_IPI_CALL_IRQ);
 }
 
-irqreturn_t ipi_resched_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id)
 {
         return IRQ_HANDLED;
 }
 
-irqreturn_t ipi_call_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t ipi_call_interrupt(int irq, void *dev_id)
 {
         smp_call_function_interrupt();
 
@@ -250,8 +250,8 @@ void __init plat_prepare_cpus(unsigned int max_cpus)
 {
         /* set up ipi interrupts */
         if (cpu_has_vint) {
-                set_vi_handler (MIPS_CPU_IPI_RESCHED_IRQ, ipi_resched_dispatch);
-                set_vi_handler (MIPS_CPU_IPI_CALL_IRQ, ipi_call_dispatch);
+                set_vi_handler(MIPS_CPU_IPI_RESCHED_IRQ, ipi_resched_dispatch);
+                set_vi_handler(MIPS_CPU_IPI_CALL_IRQ, ipi_call_dispatch);
         }
 
         cpu_ipi_resched_irq = MIPSCPU_INT_BASE + MIPS_CPU_IPI_RESCHED_IRQ;
diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c
index 221895802dca..1af3612a1ce8 100644
--- a/arch/mips/kernel/smp.c
+++ b/arch/mips/kernel/smp.c
@@ -467,14 +467,18 @@ static DEFINE_PER_CPU(struct cpu, cpu_devices);
 
 static int __init topology_init(void)
 {
-        int cpu;
-        int ret;
+        int i, ret;
 
-        for_each_present_cpu(cpu) {
-                ret = register_cpu(&per_cpu(cpu_devices, cpu), cpu);
+#ifdef CONFIG_NUMA
+        for_each_online_node(i)
+                register_one_node(i);
+#endif /* CONFIG_NUMA */
+
+        for_each_present_cpu(i) {
+                ret = register_cpu(&per_cpu(cpu_devices, i), i);
                 if (ret)
                         printk(KERN_WARNING "topology_init: register_cpu %d "
-                               "failed (%d)\n", cpu, ret);
+                               "failed (%d)\n", i, ret);
         }
 
         return 0;
diff --git a/arch/mips/kernel/smtc-asm.S b/arch/mips/kernel/smtc-asm.S
index 76cb31d57482..1cb9441f1474 100644
--- a/arch/mips/kernel/smtc-asm.S
+++ b/arch/mips/kernel/smtc-asm.S
@@ -97,15 +97,12 @@ FEXPORT(__smtc_ipi_vector)
         SAVE_ALL
         CLI
         TRACE_IRQS_OFF
-        move    a0,sp
         /* Function to be invoked passed stack pad slot 5 */
         lw      t0,PT_PADSLOT5(sp)
         /* Argument from sender passed in stack pad slot 4 */
-        lw      a1,PT_PADSLOT4(sp)
-        jalr    t0
-        nop
-        j       ret_from_irq
-        nop
+        lw      a0,PT_PADSLOT4(sp)
+        PTR_LA  ra, _ret_from_irq
+        jr      t0
 
 /*
  * Called from idle loop to provoke processing of queued IPIs
diff --git a/arch/mips/kernel/smtc.c b/arch/mips/kernel/smtc.c
index 604bcc5cb7c8..cc1f7474f7d7 100644
--- a/arch/mips/kernel/smtc.c
+++ b/arch/mips/kernel/smtc.c
@@ -82,7 +82,7 @@ struct smtc_ipi_q freeIPIq;
 
 /* Forward declarations */
 
-void ipi_decode(struct pt_regs *, struct smtc_ipi *);
+void ipi_decode(struct smtc_ipi *);
 void post_direct_ipi(int cpu, struct smtc_ipi *pipi);
 void setup_cross_vpe_interrupts(void);
 void init_smtc_stats(void);
@@ -820,19 +820,19 @@ void post_direct_ipi(int cpu, struct smtc_ipi *pipi)
         write_tc_c0_tcrestart(__smtc_ipi_vector);
 }
 
-void ipi_resched_interrupt(struct pt_regs *regs)
+static void ipi_resched_interrupt(void)
 {
         /* Return from interrupt should be enough to cause scheduler check */
 }
 
 
-void ipi_call_interrupt(struct pt_regs *regs)
+static void ipi_call_interrupt(void)
 {
         /* Invoke generic function invocation code in smp.c */
         smp_call_function_interrupt();
 }
 
-void ipi_decode(struct pt_regs *regs, struct smtc_ipi *pipi)
+void ipi_decode(struct smtc_ipi *pipi)
 {
         void *arg_copy = pipi->arg;
         int type_copy = pipi->type;
@@ -846,15 +846,15 @@ void ipi_decode(struct pt_regs *regs, struct smtc_ipi *pipi)
 #ifdef SMTC_IDLE_HOOK_DEBUG
                 clock_hang_reported[dest_copy] = 0;
 #endif /* SMTC_IDLE_HOOK_DEBUG */
-                local_timer_interrupt(0, NULL, regs);
+                local_timer_interrupt(0, NULL);
                 break;
         case LINUX_SMP_IPI:
                 switch ((int)arg_copy) {
                 case SMP_RESCHEDULE_YOURSELF:
-                        ipi_resched_interrupt(regs);
+                        ipi_resched_interrupt();
                         break;
                 case SMP_CALL_FUNCTION:
-                        ipi_call_interrupt(regs);
+                        ipi_call_interrupt();
                         break;
                 default:
                         printk("Impossible SMTC IPI Argument 0x%x\n",
@@ -868,7 +868,7 @@ void ipi_decode(struct pt_regs *regs, struct smtc_ipi *pipi)
         }
 }
 
-void deferred_smtc_ipi(struct pt_regs *regs)
+void deferred_smtc_ipi(void)
 {
         struct smtc_ipi *pipi;
         unsigned long flags;
@@ -883,7 +883,7 @@ void deferred_smtc_ipi(struct pt_regs *regs)
                 while((pipi = smtc_ipi_dq(&IPIQ[q])) != NULL) {
                         /* ipi_decode() should be called with interrupts off */
                         local_irq_save(flags);
-                        ipi_decode(regs, pipi);
+                        ipi_decode(pipi);
                         local_irq_restore(flags);
                 }
         }
@@ -917,7 +917,7 @@ void smtc_timer_broadcast(int vpe)
 
 static int cpu_ipi_irq = MIPSCPU_INT_BASE + MIPS_CPU_IPI_IRQ;
 
-static irqreturn_t ipi_interrupt(int irq, void *dev_idm, struct pt_regs *regs)
+static irqreturn_t ipi_interrupt(int irq, void *dev_idm)
 {
         int my_vpe = cpu_data[smp_processor_id()].vpe_id;
         int my_tc = cpu_data[smp_processor_id()].tc_id;
@@ -978,7 +978,7 @@ static irqreturn_t ipi_interrupt(int irq, void *dev_idm, struct pt_regs *regs)
                                  * with interrupts off
                                  */
                                 local_irq_save(flags);
-                                ipi_decode(regs, pipi);
+                                ipi_decode(pipi);
                                 local_irq_restore(flags);
                         }
                 }
@@ -987,9 +987,9 @@ static irqreturn_t ipi_interrupt(int irq, void *dev_idm, struct pt_regs *regs)
         return IRQ_HANDLED;
 }
 
-static void ipi_irq_dispatch(struct pt_regs *regs)
+static void ipi_irq_dispatch(void)
 {
-        do_IRQ(cpu_ipi_irq, regs);
+        do_IRQ(cpu_ipi_irq);
 }
 
 static struct irqaction irq_ipi;
diff --git a/arch/mips/kernel/time.c b/arch/mips/kernel/time.c
index a8340802f2d7..debe86c2f691 100644
--- a/arch/mips/kernel/time.c
+++ b/arch/mips/kernel/time.c
@@ -322,18 +322,17 @@ static long last_rtc_update;
  * a broadcasted inter-processor interrupt which itself is triggered
  * by the global timer interrupt.
  */
-void local_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+void local_timer_interrupt(int irq, void *dev_id)
 {
-        if (current->pid)
-                profile_tick(CPU_PROFILING, regs);
-        update_process_times(user_mode(regs));
+        profile_tick(CPU_PROFILING);
+        update_process_times(user_mode(get_irq_regs()));
 }
 
 /*
  * High-level timer interrupt service routines.  This function
  * is set as irqaction->handler and is invoked through do_IRQ.
  */
-irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+irqreturn_t timer_interrupt(int irq, void *dev_id)
 {
         unsigned long j;
         unsigned int count;
@@ -419,22 +418,22 @@ irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
          * In SMP mode, local_timer_interrupt() is invoked by appropriate
          * low-level local timer interrupt handler.
          */
-        local_timer_interrupt(irq, dev_id, regs);
+        local_timer_interrupt(irq, dev_id);
 
         return IRQ_HANDLED;
 }
 
-int null_perf_irq(struct pt_regs *regs)
+int null_perf_irq(void)
 {
         return 0;
 }
 
-int (*perf_irq)(struct pt_regs *regs) = null_perf_irq;
+int (*perf_irq)(void) = null_perf_irq;
 
 EXPORT_SYMBOL(null_perf_irq);
 EXPORT_SYMBOL(perf_irq);
 
-asmlinkage void ll_timer_interrupt(int irq, struct pt_regs *regs)
+asmlinkage void ll_timer_interrupt(int irq)
 {
         int r2 = cpu_has_mips_r2;
 
@@ -448,25 +447,25 @@ asmlinkage void ll_timer_interrupt(int irq, struct pt_regs *regs)
          * performance counter interrupt handler anyway.
          */
         if (!r2 || (read_c0_cause() & (1 << 26)))
-                if (perf_irq(regs))
+                if (perf_irq())
                         goto out;
 
         /* we keep interrupt disabled all the time */
         if (!r2 || (read_c0_cause() & (1 << 30)))
-                timer_interrupt(irq, NULL, regs);
+                timer_interrupt(irq, NULL);
 
 out:
         irq_exit();
 }
 
-asmlinkage void ll_local_timer_interrupt(int irq, struct pt_regs *regs)
+asmlinkage void ll_local_timer_interrupt(int irq)
 {
         irq_enter();
         if (smp_processor_id() != 0)
                 kstat_this_cpu.irqs[irq]++;
 
         /* we keep interrupt disabled all the time */
-        local_timer_interrupt(irq, NULL, regs);
+        local_timer_interrupt(irq, NULL);
 
         irq_exit();
 }
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index b7292a56d4cd..cce8313ec27d 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -66,7 +66,7 @@ extern asmlinkage void handle_mcheck(void);
 extern asmlinkage void handle_reserved(void);
 
 extern int fpu_emulator_cop1Handler(struct pt_regs *xcp,
-        struct mips_fpu_struct *ctx);
+        struct mips_fpu_struct *ctx, int has_fpu);
 
 void (*board_be_init)(void);
 int (*board_be_handler)(struct pt_regs *regs, int is_fixup);
@@ -641,7 +641,7 @@ asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31)
                 preempt_enable();
 
                 /* Run the emulator */
-                sig = fpu_emulator_cop1Handler (regs, &current->thread.fpu);
+                sig = fpu_emulator_cop1Handler (regs, &current->thread.fpu, 1);
 
                 preempt_disable();
 
@@ -791,11 +791,13 @@ asmlinkage void do_cpu(struct pt_regs *regs)
                         set_used_math();
                 }
 
-                preempt_enable();
-
-                if (!cpu_has_fpu) {
-                        int sig = fpu_emulator_cop1Handler(regs,
-                                                &current->thread.fpu);
+                if (cpu_has_fpu) {
+                        preempt_enable();
+                } else {
+                        int sig;
+                        preempt_enable();
+                        sig = fpu_emulator_cop1Handler(regs,
+                                                &current->thread.fpu, 0);
                         if (sig)
                                 force_sig(sig, current);
 #ifdef CONFIG_MIPS_MT_FPAFF