Merge git://git.infradead.org/~dhowells/irq-2.6

* git://git.infradead.org/~dhowells/irq-2.6:
  IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
  IRQ: Typedef the IRQ handler function type
  IRQ: Typedef the IRQ flow handler function type

44 files changed, 178 insertions, 156 deletions

diff --git a/arch/frv/kernel/dma.c b/arch/frv/kernel/dma.c
index f5de6cf7df4e..156184e17e57 100644
--- a/arch/frv/kernel/dma.c
+++ b/arch/frv/kernel/dma.c
@@ -121,15 +121,14 @@ unsigned long frv_dma_inprogress;
 /*
  * DMA irq handler - determine channel involved, grab status and call real handler
  */
-static irqreturn_t dma_irq_handler(int irq, void *_channel, struct pt_regs *regs)
+static irqreturn_t dma_irq_handler(int irq, void *_channel)
 {
         struct frv_dma_channel *channel = _channel;
 
         frv_clear_dma_inprogress(channel - frv_dma_channels);
         return channel->handler(channel - frv_dma_channels,
                                 __get_DMAC(channel->ioaddr, CSTR),
-                                channel->data,
-                                regs);
+                                channel->data);
 
 } /* end dma_irq_handler() */
 
diff --git a/arch/frv/kernel/irq-mb93091.c b/arch/frv/kernel/irq-mb93091.c
index 369bc0a7443d..ad753c1e9b8f 100644
--- a/arch/frv/kernel/irq-mb93091.c
+++ b/arch/frv/kernel/irq-mb93091.c
@@ -80,7 +80,7 @@ static struct irq_chip frv_fpga_pic = {
 /*
  * FPGA PIC interrupt handler
  */
-static irqreturn_t fpga_interrupt(int irq, void *_mask, struct pt_regs *regs)
+static irqreturn_t fpga_interrupt(int irq, void *_mask)
 {
         uint16_t imr, mask = (unsigned long) _mask;
 
@@ -95,7 +95,7 @@ static irqreturn_t fpga_interrupt(int irq, void *_mask, struct pt_regs *regs)
                 irq = 31 - irq;
                 mask &= ~(1 << irq);
 
-                generic_handle_irq(IRQ_BASE_FPGA + irq, regs);
+                generic_handle_irq(IRQ_BASE_FPGA + irq);
         }
 
         return IRQ_HANDLED;
diff --git a/arch/frv/kernel/irq-mb93093.c b/arch/frv/kernel/irq-mb93093.c
index a43a22158956..e0983f6926ed 100644
--- a/arch/frv/kernel/irq-mb93093.c
+++ b/arch/frv/kernel/irq-mb93093.c
@@ -79,7 +79,7 @@ static struct irq_chip frv_fpga_pic = {
 /*
  * FPGA PIC interrupt handler
  */
-static irqreturn_t fpga_interrupt(int irq, void *_mask, struct pt_regs *regs)
+static irqreturn_t fpga_interrupt(int irq, void *_mask)
 {
         uint16_t imr, mask = (unsigned long) _mask;
 
@@ -94,7 +94,7 @@ static irqreturn_t fpga_interrupt(int irq, void *_mask, struct pt_regs *regs)
                 irq = 31 - irq;
                 mask &= ~(1 << irq);
 
-                generic_irq_handle(IRQ_BASE_FPGA + irq, regs);
+                generic_irq_handle(IRQ_BASE_FPGA + irq);
         }
 
         return IRQ_HANDLED;
diff --git a/arch/frv/kernel/irq-mb93493.c b/arch/frv/kernel/irq-mb93493.c
index 39c0188a3498..c157eeff871d 100644
--- a/arch/frv/kernel/irq-mb93493.c
+++ b/arch/frv/kernel/irq-mb93493.c
@@ -90,7 +90,7 @@ static struct irq_chip frv_mb93493_pic = {
 /*
  * MB93493 PIC interrupt handler
  */
-static irqreturn_t mb93493_interrupt(int irq, void *_piqsr, struct pt_regs *regs)
+static irqreturn_t mb93493_interrupt(int irq, void *_piqsr)
 {
         volatile void *piqsr = _piqsr;
         uint32_t iqsr;
@@ -106,7 +106,7 @@ static irqreturn_t mb93493_interrupt(int irq, void *_piqsr, struct pt_regs *regs
                 irq = 31 - irq;
                 iqsr &= ~(1 << irq);
 
-                generic_handle_irq(IRQ_BASE_MB93493 + irq, regs);
+                generic_handle_irq(IRQ_BASE_MB93493 + irq);
         }
 
         return IRQ_HANDLED;
diff --git a/arch/frv/kernel/irq.c b/arch/frv/kernel/irq.c
index 5ac041c7c0a4..87f360a4ea27 100644
--- a/arch/frv/kernel/irq.c
+++ b/arch/frv/kernel/irq.c
@@ -143,7 +143,7 @@ static struct irq_chip frv_cpu_pic = {
 asmlinkage void do_IRQ(void)
 {
         irq_enter();
-        generic_handle_irq(__get_IRL(), __frame);
+        generic_handle_irq(__get_IRL());
         irq_exit();
 }
 
diff --git a/arch/frv/kernel/time.c b/arch/frv/kernel/time.c
index 44a9aebc4f5a..ed588d73d7d8 100644
--- a/arch/frv/kernel/time.c
+++ b/arch/frv/kernel/time.c
@@ -40,7 +40,7 @@ unsigned long __nongprelbss __dsu_clock_speed_HZ;
 unsigned long __nongprelbss __serial_clock_speed_HZ;
 unsigned long __delay_loops_MHz;
 
-static irqreturn_t timer_interrupt(int irq, void *dummy, struct pt_regs *regs);
+static irqreturn_t timer_interrupt(int irq, void *dummy);
 
 static struct irqaction timer_irq  = {
         timer_interrupt, IRQF_DISABLED, CPU_MASK_NONE, "timer", NULL, NULL
@@ -55,7 +55,7 @@ static inline int set_rtc_mmss(unsigned long nowtime)
  * timer_interrupt() needs to keep up the real-time clock,
  * as well as call the "do_timer()" routine every clocktick
  */
-static irqreturn_t timer_interrupt(int irq, void *dummy, struct pt_regs * regs)
+static irqreturn_t timer_interrupt(int irq, void *dummy)
 {
         /* last time the cmos clock got updated */
         static long last_rtc_update = 0;
@@ -70,8 +70,8 @@ static irqreturn_t timer_interrupt(int irq, void *dummy, struct pt_regs * regs)
         write_seqlock(&xtime_lock);
 
         do_timer(1);
-        update_process_times(user_mode(regs));
-        profile_tick(CPU_PROFILING, regs);
+        update_process_times(user_mode(get_irq_regs()));
+        profile_tick(CPU_PROFILING);
 
         /*
          * If we have an externally synchronized Linux clock, then update
diff --git a/arch/i386/kernel/apic.c b/arch/i386/kernel/apic.c
index 90faae5c5d30..7d500da0e63b 100644
--- a/arch/i386/kernel/apic.c
+++ b/arch/i386/kernel/apic.c
@@ -1193,11 +1193,11 @@ EXPORT_SYMBOL(switch_ipi_to_APIC_timer);
  * value into /proc/profile.
  */
 
-inline void smp_local_timer_interrupt(struct pt_regs * regs)
+inline void smp_local_timer_interrupt(void)
 {
-        profile_tick(CPU_PROFILING, regs);
+        profile_tick(CPU_PROFILING);
 #ifdef CONFIG_SMP
-        update_process_times(user_mode_vm(regs));
+        update_process_times(user_mode_vm(irq_regs));
 #endif
 
         /*
@@ -1223,6 +1223,7 @@ inline void smp_local_timer_interrupt(struct pt_regs * regs)
 
 fastcall void smp_apic_timer_interrupt(struct pt_regs *regs)
 {
+        struct pt_regs *old_regs = set_irq_regs(regs);
         int cpu = smp_processor_id();
 
         /*
@@ -1241,12 +1242,13 @@ fastcall void smp_apic_timer_interrupt(struct pt_regs *regs)
          * interrupt lock, which is the WrongThing (tm) to do.
          */
         irq_enter();
-        smp_local_timer_interrupt(regs);
+        smp_local_timer_interrupt();
         irq_exit();
+        set_irq_regs(old_regs);
 }
 
 #ifndef CONFIG_SMP
-static void up_apic_timer_interrupt_call(struct pt_regs *regs)
+static void up_apic_timer_interrupt_call(void)
 {
         int cpu = smp_processor_id();
 
@@ -1255,11 +1257,11 @@ static void up_apic_timer_interrupt_call(struct pt_regs *regs)
          */
         per_cpu(irq_stat, cpu).apic_timer_irqs++;
 
-        smp_local_timer_interrupt(regs);
+        smp_local_timer_interrupt();
 }
 #endif
 
-void smp_send_timer_broadcast_ipi(struct pt_regs *regs)
+void smp_send_timer_broadcast_ipi(void)
 {
         cpumask_t mask;
 
@@ -1272,7 +1274,7 @@ void smp_send_timer_broadcast_ipi(struct pt_regs *regs)
                  * We can directly call the apic timer interrupt handler
                  * in UP case. Minus all irq related functions
                  */
-                up_apic_timer_interrupt_call(regs);
+                up_apic_timer_interrupt_call();
 #endif
         }
 }
diff --git a/arch/i386/kernel/i8259.c b/arch/i386/kernel/i8259.c
index d07ed31f11e3..d53eafb6daa7 100644
--- a/arch/i386/kernel/i8259.c
+++ b/arch/i386/kernel/i8259.c
@@ -335,13 +335,13 @@ void init_8259A(int auto_eoi)
  */
  
 
-static irqreturn_t math_error_irq(int cpl, void *dev_id, struct pt_regs *regs)
+static irqreturn_t math_error_irq(int cpl, void *dev_id)
 {
         extern void math_error(void __user *);
         outb(0,0xF0);
         if (ignore_fpu_irq || !boot_cpu_data.hard_math)
                 return IRQ_NONE;
-        math_error((void __user *)regs->eip);
+        math_error((void __user *)get_irq_regs()->eip);
         return IRQ_HANDLED;
 }
 
diff --git a/arch/i386/kernel/irq.c b/arch/i386/kernel/irq.c
index 3dd2e180151b..8cfc7dbec7b9 100644
--- a/arch/i386/kernel/irq.c
+++ b/arch/i386/kernel/irq.c
@@ -53,6 +53,7 @@ static union irq_ctx *softirq_ctx[NR_CPUS] __read_mostly;
  */
 fastcall unsigned int do_IRQ(struct pt_regs *regs)
 {       
+        struct pt_regs *old_regs;
         /* high bit used in ret_from_ code */
         int irq = ~regs->orig_eax;
         struct irq_desc *desc = irq_desc + irq;
@@ -67,6 +68,7 @@ fastcall unsigned int do_IRQ(struct pt_regs *regs)
                 BUG();
         }
 
+        old_regs = set_irq_regs(regs);
         irq_enter();
 #ifdef CONFIG_DEBUG_STACKOVERFLOW
         /* Debugging check for stack overflow: is there less than 1KB free? */
@@ -95,7 +97,7 @@ fastcall unsigned int do_IRQ(struct pt_regs *regs)
          * current stack (which is the irq stack already after all)
          */
         if (curctx != irqctx) {
-                int arg1, arg2, arg3, ebx;
+                int arg1, arg2, ebx;
 
                 /* build the stack frame on the IRQ stack */
                 isp = (u32*) ((char*)irqctx + sizeof(*irqctx));
@@ -114,17 +116,17 @@ fastcall unsigned int do_IRQ(struct pt_regs *regs)
                         "       xchgl  %%ebx,%%esp      \n"
                         "       call   *%%edi           \n"
                         "       movl   %%ebx,%%esp      \n"
-                        : "=a" (arg1), "=d" (arg2), "=c" (arg3), "=b" (ebx)
-                        :  "0" (irq),   "1" (desc),  "2" (regs),  "3" (isp),
+                        : "=a" (arg1), "=d" (arg2), "=b" (ebx)
+                        :  "0" (irq),   "1" (desc),  "2" (isp),
                            "D" (desc->handle_irq)
                         : "memory", "cc"
                 );
         } else
 #endif
-                desc->handle_irq(irq, desc, regs);
+                desc->handle_irq(irq, desc);
 
         irq_exit();
-
+        set_irq_regs(old_regs);
         return 1;
 }
 
diff --git a/arch/i386/kernel/smp.c b/arch/i386/kernel/smp.c
index 1b080ab8a49f..31e5c6573aae 100644
--- a/arch/i386/kernel/smp.c
+++ b/arch/i386/kernel/smp.c
@@ -321,6 +321,7 @@ static inline void leave_mm (unsigned long cpu)
 
 fastcall void smp_invalidate_interrupt(struct pt_regs *regs)
 {
+        struct pt_regs *old_regs = set_irq_regs(regs);
         unsigned long cpu;
 
         cpu = get_cpu();
@@ -351,6 +352,7 @@ fastcall void smp_invalidate_interrupt(struct pt_regs *regs)
         smp_mb__after_clear_bit();
 out:
         put_cpu_no_resched();
+        set_irq_regs(old_regs);
 }
 
 static void flush_tlb_others(cpumask_t cpumask, struct mm_struct *mm,
@@ -605,11 +607,14 @@ void smp_send_stop(void)
  */
 fastcall void smp_reschedule_interrupt(struct pt_regs *regs)
 {
+        struct pt_regs *old_regs = set_irq_regs(regs);
         ack_APIC_irq();
+        set_irq_regs(old_regs);
 }
 
 fastcall void smp_call_function_interrupt(struct pt_regs *regs)
 {
+        struct pt_regs *old_regs = set_irq_regs(regs);
         void (*func) (void *info) = call_data->func;
         void *info = call_data->info;
         int wait = call_data->wait;
@@ -632,6 +637,7 @@ fastcall void smp_call_function_interrupt(struct pt_regs *regs)
                 mb();
                 atomic_inc(&call_data->finished);
         }
+        set_irq_regs(old_regs);
 }
 
 /*
diff --git a/arch/i386/kernel/time.c b/arch/i386/kernel/time.c
index 58a2d5582419..3f221f5eb47e 100644
--- a/arch/i386/kernel/time.c
+++ b/arch/i386/kernel/time.c
@@ -161,7 +161,7 @@ EXPORT_SYMBOL(profile_pc);
  * Time Stamp Counter value at the time of the timer interrupt, so that
  * we later on can estimate the time of day more exactly.
  */
-irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+irqreturn_t timer_interrupt(int irq, void *dev_id)
 {
         /*
          * Here we are in the timer irq handler. We just have irqs locally
@@ -188,7 +188,7 @@ irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
         }
 #endif
 
-        do_timer_interrupt_hook(regs);
+        do_timer_interrupt_hook();
 
 
         if (MCA_bus) {
@@ -209,7 +209,7 @@ irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 
 #ifdef CONFIG_X86_LOCAL_APIC
         if (using_apic_timer)
-                smp_send_timer_broadcast_ipi(regs);
+                smp_send_timer_broadcast_ipi();
 #endif
 
         return IRQ_HANDLED;
diff --git a/arch/i386/kernel/time_hpet.c b/arch/i386/kernel/time_hpet.c
index 6bf14a4e995e..1a2a979cf6a3 100644
--- a/arch/i386/kernel/time_hpet.c
+++ b/arch/i386/kernel/time_hpet.c
@@ -441,7 +441,7 @@ int hpet_rtc_dropped_irq(void)
         return 1;
 }
 
-irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id)
 {
         struct rtc_time curr_time;
         unsigned long rtc_int_flag = 0;
@@ -480,7 +480,7 @@ irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id, struct pt_regs *regs)
         }
         if (call_rtc_interrupt) {
                 rtc_int_flag |= (RTC_IRQF | (RTC_NUM_INTS << 8));
-                rtc_interrupt(rtc_int_flag, dev_id, regs);
+                rtc_interrupt(rtc_int_flag, dev_id);
         }
         return IRQ_HANDLED;
 }
diff --git a/arch/i386/kernel/vm86.c b/arch/i386/kernel/vm86.c
index 8355d8d87d18..cbcd61d6120b 100644
--- a/arch/i386/kernel/vm86.c
+++ b/arch/i386/kernel/vm86.c
@@ -714,7 +714,7 @@ static int irqbits;
         | (1 << SIGUSR1) | (1 << SIGUSR2) | (1 << SIGIO)  | (1 << SIGURG) \
         | (1 << SIGUNUSED) )
         
-static irqreturn_t irq_handler(int intno, void *dev_id, struct pt_regs * regs)
+static irqreturn_t irq_handler(int intno, void *dev_id)
 {
         int irq_bit;
         unsigned long flags;
diff --git a/arch/i386/mach-visws/visws_apic.c b/arch/i386/mach-visws/visws_apic.c
index 5929f884d79b..07097ed48890 100644
--- a/arch/i386/mach-visws/visws_apic.c
+++ b/arch/i386/mach-visws/visws_apic.c
@@ -191,7 +191,7 @@ static struct hw_interrupt_type piix4_virtual_irq_type = {
  * enable_irq gets the right irq. This 'master' irq is never directly
  * manipulated by any driver.
  */
-static irqreturn_t piix4_master_intr(int irq, void *dev_id, struct pt_regs * regs)
+static irqreturn_t piix4_master_intr(int irq, void *dev_id)
 {
         int realirq;
         irq_desc_t *desc;
@@ -244,7 +244,7 @@ static irqreturn_t piix4_master_intr(int irq, void *dev_id, struct pt_regs * reg
         kstat_cpu(smp_processor_id()).irqs[realirq]++;
 
         if (likely(desc->action != NULL))
-                handle_IRQ_event(realirq, regs, desc->action);
+                handle_IRQ_event(realirq, desc->action);
 
         if (!(desc->status & IRQ_DISABLED))
                 enable_8259A_irq(realirq);
diff --git a/arch/i386/mach-voyager/voyager_basic.c b/arch/i386/mach-voyager/voyager_basic.c
index 80b7f2fc4f46..c639d30d8bdc 100644
--- a/arch/i386/mach-voyager/voyager_basic.c
+++ b/arch/i386/mach-voyager/voyager_basic.c
@@ -87,7 +87,7 @@ voyager_detect(struct voyager_bios_info *bios)
 }
 
 void
-voyager_system_interrupt(int cpl, void *dev_id, struct pt_regs *regs)
+voyager_system_interrupt(int cpl, void *dev_id)
 {
         printk("Voyager: detected system interrupt\n");
 }
diff --git a/arch/i386/mach-voyager/voyager_smp.c b/arch/i386/mach-voyager/voyager_smp.c
index 856c73fcb7e7..d42422fc4af3 100644
--- a/arch/i386/mach-voyager/voyager_smp.c
+++ b/arch/i386/mach-voyager/voyager_smp.c
@@ -126,10 +126,10 @@ send_QIC_CPI(__u32 cpuset, __u8 cpi)
 }
 
 static inline void
-wrapper_smp_local_timer_interrupt(struct pt_regs *regs)
+wrapper_smp_local_timer_interrupt(void)
 {
         irq_enter();
-        smp_local_timer_interrupt(regs);
+        smp_local_timer_interrupt();
         irq_exit();
 }
 
@@ -786,7 +786,7 @@ fastcall void
 smp_vic_sys_interrupt(struct pt_regs *regs)
 {
         ack_CPI(VIC_SYS_INT);
-        printk("Voyager SYSTEM INTERRUPT\n");
+        printk("Voyager SYSTEM INTERRUPT\n");   
 }
 
 /* Handle a voyager CMN_INT; These interrupts occur either because of
@@ -1135,7 +1135,9 @@ EXPORT_SYMBOL(smp_call_function);
 fastcall void 
 smp_apic_timer_interrupt(struct pt_regs *regs)
 {
-        wrapper_smp_local_timer_interrupt(regs);
+        struct pt_regs *old_regs = set_irq_regs(regs);
+        wrapper_smp_local_timer_interrupt();
+        set_irq_regs(old_regs);
 }
 
 /* All of the QUAD interrupt GATES */
@@ -1143,7 +1145,9 @@ fastcall void
 smp_qic_timer_interrupt(struct pt_regs *regs)
 {
         ack_QIC_CPI(QIC_TIMER_CPI);
-        wrapper_smp_local_timer_interrupt(regs);
+        struct pt_regs *old_regs = set_irq_regs(regs);
+        wrapper_smp_local_timer_interrupt(void);
+        set_irq_regs(old_regs);
 }
 
 fastcall void
@@ -1177,6 +1181,7 @@ smp_qic_call_function_interrupt(struct pt_regs *regs)
 fastcall void
 smp_vic_cpi_interrupt(struct pt_regs *regs)
 {
+        struct pt_regs *old_regs = set_irq_regs(regs);
         __u8 cpu = smp_processor_id();
 
         if(is_cpu_quad())
@@ -1185,7 +1190,7 @@ smp_vic_cpi_interrupt(struct pt_regs *regs)
                 ack_VIC_CPI(VIC_CPI_LEVEL0);
 
         if(test_and_clear_bit(VIC_TIMER_CPI, &vic_cpi_mailbox[cpu]))
-                wrapper_smp_local_timer_interrupt(regs);
+                wrapper_smp_local_timer_interrupt();
         if(test_and_clear_bit(VIC_INVALIDATE_CPI, &vic_cpi_mailbox[cpu]))
                 smp_invalidate_interrupt();
         if(test_and_clear_bit(VIC_RESCHEDULE_CPI, &vic_cpi_mailbox[cpu]))
@@ -1194,6 +1199,7 @@ smp_vic_cpi_interrupt(struct pt_regs *regs)
                 smp_enable_irq_interrupt();
         if(test_and_clear_bit(VIC_CALL_FUNCTION_CPI, &vic_cpi_mailbox[cpu]))
                 smp_call_function_interrupt();
+        set_irq_regs(old_regs);
 }
 
 static void
@@ -1266,8 +1272,10 @@ smp_send_stop(void)
 void
 smp_vic_timer_interrupt(struct pt_regs *regs)
 {
+        struct pt_regs *old_regs = set_irq_regs(regs);
         send_CPI_allbutself(VIC_TIMER_CPI);
-        smp_local_timer_interrupt(regs);
+        smp_local_timer_interrupt();
+        set_irq_regs(old_regs);
 }
 
 /* local (per CPU) timer interrupt.  It does both profiling and
@@ -1279,12 +1287,12 @@ smp_vic_timer_interrupt(struct pt_regs *regs)
  * value into /proc/profile.
  */
 void
-smp_local_timer_interrupt(struct pt_regs * regs)
+smp_local_timer_interrupt(void)
 {
         int cpu = smp_processor_id();
         long weight;
 
-        profile_tick(CPU_PROFILING, regs);
+        profile_tick(CPU_PROFILING);
         if (--per_cpu(prof_counter, cpu) <= 0) {
                 /*
                  * The multiplier may have changed since the last time we got
@@ -1302,7 +1310,7 @@ smp_local_timer_interrupt(struct pt_regs * regs)
                                                 per_cpu(prof_counter, cpu);
                 }
 
-                update_process_times(user_mode_vm(regs));
+                update_process_times(user_mode_vm(irq_regs));
         }
 
         if( ((1<<cpu) & voyager_extended_vic_processors) == 0)
diff --git a/arch/ia64/kernel/irq_ia64.c b/arch/ia64/kernel/irq_ia64.c
index ab2d19c3661f..7fd3ef9e064d 100644
--- a/arch/ia64/kernel/irq_ia64.c
+++ b/arch/ia64/kernel/irq_ia64.c
@@ -138,6 +138,7 @@ void destroy_irq(unsigned int irq)
 void
 ia64_handle_irq (ia64_vector vector, struct pt_regs *regs)
 {
+        struct pt_regs *old_regs = set_irq_regs(regs);
         unsigned long saved_tpr;
 
 #if IRQ_DEBUG
@@ -183,7 +184,7 @@ ia64_handle_irq (ia64_vector vector, struct pt_regs *regs)
                         ia64_setreg(_IA64_REG_CR_TPR, vector);
                         ia64_srlz_d();
 
-                        __do_IRQ(local_vector_to_irq(vector), regs);
+                        __do_IRQ(local_vector_to_irq(vector));
 
                         /*
                          * Disable interrupts and send EOI:
@@ -200,6 +201,7 @@ ia64_handle_irq (ia64_vector vector, struct pt_regs *regs)
          * come through until ia64_eoi() has been done.
          */
         irq_exit();
+        set_irq_regs(old_regs);
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
diff --git a/arch/ia64/kernel/machvec.c b/arch/ia64/kernel/machvec.c
index d4a546aa5048..9620822270a6 100644
--- a/arch/ia64/kernel/machvec.c
+++ b/arch/ia64/kernel/machvec.c
@@ -60,7 +60,7 @@ machvec_setup (char **arg)
 EXPORT_SYMBOL(machvec_setup);
 
 void
-machvec_timer_interrupt (int irq, void *dev_id, struct pt_regs *regs)
+machvec_timer_interrupt (int irq, void *dev_id)
 {
 }
 EXPORT_SYMBOL(machvec_timer_interrupt);
diff --git a/arch/ia64/kernel/mca.c b/arch/ia64/kernel/mca.c
index 663230183254..7cfa63a98cb3 100644
--- a/arch/ia64/kernel/mca.c
+++ b/arch/ia64/kernel/mca.c
@@ -499,7 +499,7 @@ int cpe_vector = -1;
 int ia64_cpe_irq = -1;
 
 static irqreturn_t
-ia64_mca_cpe_int_handler (int cpe_irq, void *arg, struct pt_regs *ptregs)
+ia64_mca_cpe_int_handler (int cpe_irq, void *arg)
 {
         static unsigned long    cpe_history[CPE_HISTORY_LENGTH];
         static int              index;
@@ -744,7 +744,7 @@ ia64_mca_wakeup_all(void)
  *  Outputs :   None
  */
 static irqreturn_t
-ia64_mca_rendez_int_handler(int rendez_irq, void *arg, struct pt_regs *regs)
+ia64_mca_rendez_int_handler(int rendez_irq, void *arg)
 {
         unsigned long flags;
         int cpu = smp_processor_id();
@@ -753,8 +753,8 @@ ia64_mca_rendez_int_handler(int rendez_irq, void *arg, struct pt_regs *regs)
 
         /* Mask all interrupts */
         local_irq_save(flags);
-        if (notify_die(DIE_MCA_RENDZVOUS_ENTER, "MCA", regs, (long)&nd, 0, 0)
-                        == NOTIFY_STOP)
+        if (notify_die(DIE_MCA_RENDZVOUS_ENTER, "MCA", get_irq_regs(),
+                       (long)&nd, 0, 0) == NOTIFY_STOP)
                 ia64_mca_spin(__FUNCTION__);
 
         ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_DONE;
@@ -763,16 +763,16 @@ ia64_mca_rendez_int_handler(int rendez_irq, void *arg, struct pt_regs *regs)
          */
         ia64_sal_mc_rendez();
 
-        if (notify_die(DIE_MCA_RENDZVOUS_PROCESS, "MCA", regs, (long)&nd, 0, 0)
-                        == NOTIFY_STOP)
+        if (notify_die(DIE_MCA_RENDZVOUS_PROCESS, "MCA", get_irq_regs(),
+                       (long)&nd, 0, 0) == NOTIFY_STOP)
                 ia64_mca_spin(__FUNCTION__);
 
         /* Wait for the monarch cpu to exit. */
         while (monarch_cpu != -1)
                cpu_relax();     /* spin until monarch leaves */
 
-        if (notify_die(DIE_MCA_RENDZVOUS_LEAVE, "MCA", regs, (long)&nd, 0, 0)
-                        == NOTIFY_STOP)
+        if (notify_die(DIE_MCA_RENDZVOUS_LEAVE, "MCA", get_irq_regs(),
+                       (long)&nd, 0, 0) == NOTIFY_STOP)
                 ia64_mca_spin(__FUNCTION__);
 
         /* Enable all interrupts */
@@ -791,12 +791,11 @@ ia64_mca_rendez_int_handler(int rendez_irq, void *arg, struct pt_regs *regs)
  *
  *  Inputs  :   wakeup_irq  (Wakeup-interrupt bit)
  *      arg             (Interrupt handler specific argument)
- *      ptregs          (Exception frame at the time of the interrupt)
  *  Outputs :   None
  *
  */
 static irqreturn_t
-ia64_mca_wakeup_int_handler(int wakeup_irq, void *arg, struct pt_regs *ptregs)
+ia64_mca_wakeup_int_handler(int wakeup_irq, void *arg)
 {
         return IRQ_HANDLED;
 }
@@ -1261,13 +1260,12 @@ static DECLARE_WORK(cmc_enable_work, ia64_mca_cmc_vector_enable_keventd, NULL);
  * Inputs
  *      interrupt number
  *      client data arg ptr
- *      saved registers ptr
  *
  * Outputs
  *      None
  */
 static irqreturn_t
-ia64_mca_cmc_int_handler(int cmc_irq, void *arg, struct pt_regs *ptregs)
+ia64_mca_cmc_int_handler(int cmc_irq, void *arg)
 {
         static unsigned long    cmc_history[CMC_HISTORY_LENGTH];
         static int              index;
@@ -1336,12 +1334,11 @@ out:
  * Inputs
  *      interrupt number
  *      client data arg ptr
- *      saved registers ptr
  * Outputs
  *      handled
  */
 static irqreturn_t
-ia64_mca_cmc_int_caller(int cmc_irq, void *arg, struct pt_regs *ptregs)
+ia64_mca_cmc_int_caller(int cmc_irq, void *arg)
 {
         static int start_count = -1;
         unsigned int cpuid;
@@ -1352,7 +1349,7 @@ ia64_mca_cmc_int_caller(int cmc_irq, void *arg, struct pt_regs *ptregs)
         if (start_count == -1)
                 start_count = IA64_LOG_COUNT(SAL_INFO_TYPE_CMC);
 
-        ia64_mca_cmc_int_handler(cmc_irq, arg, ptregs);
+        ia64_mca_cmc_int_handler(cmc_irq, arg);
 
         for (++cpuid ; cpuid < NR_CPUS && !cpu_online(cpuid) ; cpuid++);
 
@@ -1403,14 +1400,13 @@ ia64_mca_cmc_poll (unsigned long dummy)
  * Inputs
  *      interrupt number
  *      client data arg ptr
- *      saved registers ptr
  * Outputs
  *      handled
  */
 #ifdef CONFIG_ACPI
 
 static irqreturn_t
-ia64_mca_cpe_int_caller(int cpe_irq, void *arg, struct pt_regs *ptregs)
+ia64_mca_cpe_int_caller(int cpe_irq, void *arg)
 {
         static int start_count = -1;
         static int poll_time = MIN_CPE_POLL_INTERVAL;
@@ -1422,7 +1418,7 @@ ia64_mca_cpe_int_caller(int cpe_irq, void *arg, struct pt_regs *ptregs)
         if (start_count == -1)
                 start_count = IA64_LOG_COUNT(SAL_INFO_TYPE_CPE);
 
-        ia64_mca_cpe_int_handler(cpe_irq, arg, ptregs);
+        ia64_mca_cpe_int_handler(cpe_irq, arg);
 
         for (++cpuid ; cpuid < NR_CPUS && !cpu_online(cpuid) ; cpuid++);
 
diff --git a/arch/ia64/kernel/time.c b/arch/ia64/kernel/time.c
index 62e07f906e05..41169a9bc301 100644
--- a/arch/ia64/kernel/time.c
+++ b/arch/ia64/kernel/time.c
@@ -45,7 +45,7 @@ static struct time_interpolator itc_interpolator = {
 };
 
 static irqreturn_t
-timer_interrupt (int irq, void *dev_id, struct pt_regs *regs)
+timer_interrupt (int irq, void *dev_id)
 {
         unsigned long new_itm;
 
@@ -53,7 +53,7 @@ timer_interrupt (int irq, void *dev_id, struct pt_regs *regs)
                 return IRQ_HANDLED;
         }
 
-        platform_timer_interrupt(irq, dev_id, regs);
+        platform_timer_interrupt(irq, dev_id);
 
         new_itm = local_cpu_data->itm_next;
 
@@ -61,10 +61,10 @@ timer_interrupt (int irq, void *dev_id, struct pt_regs *regs)
                 printk(KERN_ERR "Oops: timer tick before it's due (itc=%lx,itm=%lx)\n",
                        ia64_get_itc(), new_itm);
 
-        profile_tick(CPU_PROFILING, regs);
+        profile_tick(CPU_PROFILING);
 
         while (1) {
-                update_process_times(user_mode(regs));
+                update_process_times(user_mode(get_irq_regs()));
 
                 new_itm += local_cpu_data->itm_delta;
 
diff --git a/arch/ia64/sn/pci/tioca_provider.c b/arch/ia64/sn/pci/tioca_provider.c
index c36b0f5affb3..8a2cb4e691fd 100644
--- a/arch/ia64/sn/pci/tioca_provider.c
+++ b/arch/ia64/sn/pci/tioca_provider.c
@@ -550,13 +550,12 @@ tioca_dma_map(struct pci_dev *pdev, u64 paddr, size_t byte_count, int dma_flags)
  * tioca_error_intr_handler - SGI TIO CA error interrupt handler
  * @irq: unused
  * @arg: pointer to tioca_common struct for the given CA
- * @pt: unused
  *
  * Handle a CA error interrupt.  Simply a wrapper around a SAL call which
  * defers processing to the SGI prom.
  */
 static irqreturn_t
-tioca_error_intr_handler(int irq, void *arg, struct pt_regs *pt)
+tioca_error_intr_handler(int irq, void *arg)
 {
         struct tioca_common *soft = arg;
         struct ia64_sal_retval ret_stuff;
diff --git a/arch/ia64/sn/pci/tioce_provider.c b/arch/ia64/sn/pci/tioce_provider.c
index af7171adcd2c..0e81f68aaf8e 100644
--- a/arch/ia64/sn/pci/tioce_provider.c
+++ b/arch/ia64/sn/pci/tioce_provider.c
@@ -666,12 +666,11 @@ tioce_dma_consistent(struct pci_dev *pdev, u64 paddr, size_t byte_count, int dma
  * tioce_error_intr_handler - SGI TIO CE error interrupt handler
  * @irq: unused
  * @arg: pointer to tioce_common struct for the given CE
- * @pt: unused
  *
  * Handle a CE error interrupt.  Simply a wrapper around a SAL call which
  * defers processing to the SGI prom.
  */ static irqreturn_t
-tioce_error_intr_handler(int irq, void *arg, struct pt_regs *pt)
+tioce_error_intr_handler(int irq, void *arg)
 {
         struct tioce_common *soft = arg;
         struct ia64_sal_retval ret_stuff;
diff --git a/arch/mips/kernel/irq.c b/arch/mips/kernel/irq.c
index d955aaefbb8e..a00b0e7ab9b1 100644
--- a/arch/mips/kernel/irq.c
+++ b/arch/mips/kernel/irq.c
@@ -55,13 +55,15 @@ unsigned long irq_hwmask[NR_IRQS];
  */
 asmlinkage unsigned int do_IRQ(unsigned int irq, struct pt_regs *regs)
 {
+        struct pt_regs *old_regs = set_irq_regs(regs);
         irq_enter();
 
         __DO_IRQ_SMTC_HOOK();
-        __do_IRQ(irq, regs);
+        __do_IRQ(irq);
 
         irq_exit();
 
+        set_irq_regs(old_regs);
         return 1;
 }
 
diff --git a/arch/mips/kernel/time.c b/arch/mips/kernel/time.c
index a8340802f2d7..d349eb9e4ffb 100644
--- a/arch/mips/kernel/time.c
+++ b/arch/mips/kernel/time.c
@@ -322,18 +322,18 @@ 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;
@@ -419,23 +419,24 @@ 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)
 {
+        struct pt_regs *old_regs = set_irq_regs(regs);
         int r2 = cpu_has_mips_r2;
 
         irq_enter();
@@ -448,27 +449,30 @@ 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();
+        set_irq_regs(old_regs);
 }
 
 asmlinkage void ll_local_timer_interrupt(int irq, struct pt_regs *regs)
 {
+        struct pt_regs *old_regs = set_irq_regs(regs);
         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();
+        set_irq_regs(old_regs);
 }
 
 /*
diff --git a/arch/mips/sgi-ip22/ip22-reset.c b/arch/mips/sgi-ip22/ip22-reset.c
index 7a941ecff3bb..66df5ac8f089 100644
--- a/arch/mips/sgi-ip22/ip22-reset.c
+++ b/arch/mips/sgi-ip22/ip22-reset.c
@@ -169,7 +169,7 @@ static inline void volume_down_button(unsigned long data)
         }
 }
 
-static irqreturn_t panel_int(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t panel_int(int irq, void *dev_id)
 {
         unsigned int buttons;
 
diff --git a/arch/mips/sgi-ip22/ip22-time.c b/arch/mips/sgi-ip22/ip22-time.c
index 0e061890f797..3462b0d98def 100644
--- a/arch/mips/sgi-ip22/ip22-time.c
+++ b/arch/mips/sgi-ip22/ip22-time.c
@@ -191,12 +191,14 @@ void indy_8254timer_irq(struct pt_regs *regs)
 
 void indy_r4k_timer_interrupt(struct pt_regs *regs)
 {
+        struct pt_regs *old_regs = set_irq_regs(regs);
         int irq = SGI_TIMER_IRQ;
 
         irq_enter();
         kstat_this_cpu.irqs[irq]++;
-        timer_interrupt(irq, NULL, regs);
+        timer_interrupt(irq, NULL);
         irq_exit();
+        set_irq_regs(old_regs);
 }
 
 void __init plat_timer_setup(struct irqaction *irq)
diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index c3f58f2f9f52..5deaab3090b4 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -187,6 +187,7 @@ void fixup_irqs(cpumask_t map)
 
 void do_IRQ(struct pt_regs *regs)
 {
+        struct pt_regs *old_regs = set_irq_regs(regs);
         unsigned int irq;
 #ifdef CONFIG_IRQSTACKS
         struct thread_info *curtp, *irqtp;
@@ -230,18 +231,19 @@ void do_IRQ(struct pt_regs *regs)
                                 handler = &__do_IRQ;
                         irqtp->task = curtp->task;
                         irqtp->flags = 0;
-                        call_handle_irq(irq, desc, regs, irqtp, handler);
+                        call_handle_irq(irq, desc, irqtp, handler);
                         irqtp->task = NULL;
                         if (irqtp->flags)
                                 set_bits(irqtp->flags, &curtp->flags);
                 } else
 #endif
-                        generic_handle_irq(irq, regs);
+                        generic_handle_irq(irq);
         } else if (irq != NO_IRQ_IGNORE)
                 /* That's not SMP safe ... but who cares ? */
                 ppc_spurious_interrupts++;
 
         irq_exit();
+        set_irq_regs(old_regs);
 
 #ifdef CONFIG_PPC_ISERIES
         if (get_lppaca()->int_dword.fields.decr_int) {
diff --git a/arch/powerpc/kernel/misc_64.S b/arch/powerpc/kernel/misc_64.S
index 41521b30c3cd..c70e20708a1f 100644
--- a/arch/powerpc/kernel/misc_64.S
+++ b/arch/powerpc/kernel/misc_64.S
@@ -52,12 +52,12 @@ _GLOBAL(call_do_softirq)
         blr
 
 _GLOBAL(call_handle_irq)
-        ld      r8,0(r7)
+        ld      r8,0(r6)
         mflr    r0
         std     r0,16(r1)
         mtctr   r8
-        stdu    r1,THREAD_SIZE-112(r6)
-        mr      r1,r6
+        stdu    r1,THREAD_SIZE-112(r5)
+        mr      r1,r5
         bctrl
         ld      r1,0(r1)
         ld      r0,16(r1)
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 6a9bc9ce54e0..35c6309bdb76 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -115,7 +115,7 @@ void __devinit smp_generic_kick_cpu(int nr)
 }
 #endif
 
-void smp_message_recv(int msg, struct pt_regs *regs)
+void smp_message_recv(int msg)
 {
         switch(msg) {
         case PPC_MSG_CALL_FUNCTION:
@@ -127,11 +127,11 @@ void smp_message_recv(int msg, struct pt_regs *regs)
                 break;
         case PPC_MSG_DEBUGGER_BREAK:
                 if (crash_ipi_function_ptr) {
-                        crash_ipi_function_ptr(regs);
+                        crash_ipi_function_ptr(get_irq_regs());
                         break;
                 }
 #ifdef CONFIG_DEBUGGER
-                debugger_ipi(regs);
+                debugger_ipi(get_irq_regs());
                 break;
 #endif /* CONFIG_DEBUGGER */
                 /* FALLTHROUGH */
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index 85b9244a098c..d210d0a5006b 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -51,6 +51,7 @@
 #include <linux/rtc.h>
 #include <linux/jiffies.h>
 #include <linux/posix-timers.h>
+#include <linux/irq.h>
 
 #include <asm/io.h>
 #include <asm/processor.h>
@@ -643,6 +644,7 @@ static void iSeries_tb_recal(void)
  */
 void timer_interrupt(struct pt_regs * regs)
 {
+        struct pt_regs *old_regs;
         int next_dec;
         int cpu = smp_processor_id();
         unsigned long ticks;
@@ -653,9 +655,10 @@ void timer_interrupt(struct pt_regs * regs)
                 do_IRQ(regs);
 #endif
 
+        old_regs = set_irq_regs(regs);
         irq_enter();
 
-        profile_tick(CPU_PROFILING, regs);
+        profile_tick(CPU_PROFILING);
         calculate_steal_time();
 
 #ifdef CONFIG_PPC_ISERIES
@@ -715,6 +718,7 @@ void timer_interrupt(struct pt_regs * regs)
 #endif
 
         irq_exit();
+        set_irq_regs(old_regs);
 }
 
 void wakeup_decrementer(void)
diff --git a/arch/powerpc/platforms/cell/interrupt.c b/arch/powerpc/platforms/cell/interrupt.c
index 8533f13a5ed1..434fb934dd20 100644
--- a/arch/powerpc/platforms/cell/interrupt.c
+++ b/arch/powerpc/platforms/cell/interrupt.c
@@ -190,11 +190,11 @@ struct irq_host *iic_get_irq_host(int node)
 EXPORT_SYMBOL_GPL(iic_get_irq_host);
 
 
-static irqreturn_t iic_ipi_action(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t iic_ipi_action(int irq, void *dev_id)
 {
         int ipi = (int)(long)dev_id;
 
-        smp_message_recv(ipi, regs);
+        smp_message_recv(ipi);
 
         return IRQ_HANDLED;
 }
diff --git a/arch/powerpc/platforms/cell/spider-pic.c b/arch/powerpc/platforms/cell/spider-pic.c
index b0e95d594c51..21a9ebd4978e 100644
--- a/arch/powerpc/platforms/cell/spider-pic.c
+++ b/arch/powerpc/platforms/cell/spider-pic.c
@@ -213,8 +213,7 @@ static struct irq_host_ops spider_host_ops = {
         .xlate = spider_host_xlate,
 };
 
-static void spider_irq_cascade(unsigned int irq, struct irq_desc *desc,
-                               struct pt_regs *regs)
+static void spider_irq_cascade(unsigned int irq, struct irq_desc *desc)
 {
         struct spider_pic *pic = desc->handler_data;
         unsigned int cs, virq;
@@ -225,7 +224,7 @@ static void spider_irq_cascade(unsigned int irq, struct irq_desc *desc,
         else
                 virq = irq_linear_revmap(pic->host, cs);
         if (virq != NO_IRQ)
-                generic_handle_irq(virq, regs);
+                generic_handle_irq(virq);
         desc->chip->eoi(irq);
 }
 
diff --git a/arch/powerpc/platforms/powermac/low_i2c.c b/arch/powerpc/platforms/powermac/low_i2c.c
index c2c7cf75dd5f..bfc4829162f1 100644
--- a/arch/powerpc/platforms/powermac/low_i2c.c
+++ b/arch/powerpc/platforms/powermac/low_i2c.c
@@ -342,7 +342,7 @@ static void kw_i2c_handle_interrupt(struct pmac_i2c_host_kw *host, u8 isr)
 }
 
 /* Interrupt handler */
-static irqreturn_t kw_i2c_irq(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t kw_i2c_irq(int irq, void *dev_id)
 {
         struct pmac_i2c_host_kw *host = dev_id;
         unsigned long flags;
diff --git a/arch/powerpc/platforms/powermac/pfunc_base.c b/arch/powerpc/platforms/powermac/pfunc_base.c
index ee3b223ab17a..5c6c15c5f9a3 100644
--- a/arch/powerpc/platforms/powermac/pfunc_base.c
+++ b/arch/powerpc/platforms/powermac/pfunc_base.c
@@ -15,7 +15,7 @@
 #define DBG(fmt...)
 #endif
 
-static irqreturn_t macio_gpio_irq(int irq, void *data, struct pt_regs *regs)
+static irqreturn_t macio_gpio_irq(int irq, void *data)
 {
         pmf_do_irq(data);
 
diff --git a/arch/powerpc/platforms/powermac/pic.c b/arch/powerpc/platforms/powermac/pic.c
index 39f7ddb554ea..e93a115961aa 100644
--- a/arch/powerpc/platforms/powermac/pic.c
+++ b/arch/powerpc/platforms/powermac/pic.c
@@ -440,14 +440,13 @@ static void __init pmac_pic_probe_oldstyle(void)
 }
 #endif /* CONFIG_PPC32 */
 
-static void pmac_u3_cascade(unsigned int irq, struct irq_desc *desc,
-                            struct pt_regs *regs)
+static void pmac_u3_cascade(unsigned int irq, struct irq_desc *desc)
 {
         struct mpic *mpic = desc->handler_data;
 
-        unsigned int cascade_irq = mpic_get_one_irq(mpic, regs);
+        unsigned int cascade_irq = mpic_get_one_irq(mpic, get_irq_regs());
         if (cascade_irq != NO_IRQ)
-                generic_handle_irq(cascade_irq, regs);
+                generic_handle_irq(cascade_irq);
         desc->chip->eoi(irq);
 }
 
diff --git a/arch/powerpc/platforms/pseries/ras.c b/arch/powerpc/platforms/pseries/ras.c
index 311ed1993fc0..b1d3d161249e 100644
--- a/arch/powerpc/platforms/pseries/ras.c
+++ b/arch/powerpc/platforms/pseries/ras.c
@@ -65,16 +65,14 @@ static int ras_check_exception_token;
 #define EPOW_SENSOR_INDEX       0
 #define RAS_VECTOR_OFFSET       0x500
 
-static irqreturn_t ras_epow_interrupt(int irq, void *dev_id,
-                                        struct pt_regs * regs);
-static irqreturn_t ras_error_interrupt(int irq, void *dev_id,
-                                        struct pt_regs * regs);
+static irqreturn_t ras_epow_interrupt(int irq, void *dev_id);
+static irqreturn_t ras_error_interrupt(int irq, void *dev_id);
 
 /* #define DEBUG */
 
 
 static void request_ras_irqs(struct device_node *np,
-                        irqreturn_t (*handler)(int, void *, struct pt_regs *),
+                        irq_handler_t handler,
                         const char *name)
 {
         int i, index, count = 0;
@@ -166,8 +164,7 @@ __initcall(init_ras_IRQ);
  * to examine the type of power failure and take appropriate action where
  * the time horizon permits something useful to be done.
  */
-static irqreturn_t
-ras_epow_interrupt(int irq, void *dev_id, struct pt_regs * regs)
+static irqreturn_t ras_epow_interrupt(int irq, void *dev_id)
 {
         int status = 0xdeadbeef;
         int state = 0;
@@ -210,8 +207,7 @@ ras_epow_interrupt(int irq, void *dev_id, struct pt_regs * regs)
  * For nonrecoverable errors, an error is logged and we stop all processing
  * as quickly as possible in order to prevent propagation of the failure.
  */
-static irqreturn_t
-ras_error_interrupt(int irq, void *dev_id, struct pt_regs * regs)
+static irqreturn_t ras_error_interrupt(int irq, void *dev_id)
 {
         struct rtas_error_log *rtas_elog;
         int status = 0xdeadbeef;
diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
index f82b13e531a3..ad9aec2c6fee 100644
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -121,12 +121,11 @@ static void __init fwnmi_init(void)
                 fwnmi_active = 1;
 }
 
-void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc,
-                          struct pt_regs *regs)
+void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
 {
-        unsigned int cascade_irq = i8259_irq(regs);
+        unsigned int cascade_irq = i8259_irq(get_irq_regs());
         if (cascade_irq != NO_IRQ)
-                generic_handle_irq(cascade_irq, regs);
+                generic_handle_irq(cascade_irq);
         desc->chip->eoi(irq);
 }
 
diff --git a/arch/powerpc/platforms/pseries/xics.c b/arch/powerpc/platforms/pseries/xics.c
index 253972e5479f..f6bd2f285153 100644
--- a/arch/powerpc/platforms/pseries/xics.c
+++ b/arch/powerpc/platforms/pseries/xics.c
@@ -324,7 +324,7 @@ static unsigned int xics_get_irq_lpar(struct pt_regs *regs)
 
 #ifdef CONFIG_SMP
 
-static irqreturn_t xics_ipi_dispatch(int cpu, struct pt_regs *regs)
+static irqreturn_t xics_ipi_dispatch(int cpu)
 {
         WARN_ON(cpu_is_offline(cpu));
 
@@ -332,47 +332,47 @@ static irqreturn_t xics_ipi_dispatch(int cpu, struct pt_regs *regs)
                 if (test_and_clear_bit(PPC_MSG_CALL_FUNCTION,
                                        &xics_ipi_message[cpu].value)) {
                         mb();
-                        smp_message_recv(PPC_MSG_CALL_FUNCTION, regs);
+                        smp_message_recv(PPC_MSG_CALL_FUNCTION);
                 }
                 if (test_and_clear_bit(PPC_MSG_RESCHEDULE,
                                        &xics_ipi_message[cpu].value)) {
                         mb();
-                        smp_message_recv(PPC_MSG_RESCHEDULE, regs);
+                        smp_message_recv(PPC_MSG_RESCHEDULE);
                 }
 #if 0
                 if (test_and_clear_bit(PPC_MSG_MIGRATE_TASK,
                                        &xics_ipi_message[cpu].value)) {
                         mb();
-                        smp_message_recv(PPC_MSG_MIGRATE_TASK, regs);
+                        smp_message_recv(PPC_MSG_MIGRATE_TASK);
                 }
 #endif
 #if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC)
                 if (test_and_clear_bit(PPC_MSG_DEBUGGER_BREAK,
                                        &xics_ipi_message[cpu].value)) {
                         mb();
-                        smp_message_recv(PPC_MSG_DEBUGGER_BREAK, regs);
+                        smp_message_recv(PPC_MSG_DEBUGGER_BREAK);
                 }
 #endif
         }
         return IRQ_HANDLED;
 }
 
-static irqreturn_t xics_ipi_action_direct(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t xics_ipi_action_direct(int irq, void *dev_id)
 {
         int cpu = smp_processor_id();
 
         direct_qirr_info(cpu, 0xff);
 
-        return xics_ipi_dispatch(cpu, regs);
+        return xics_ipi_dispatch(cpu);
 }
 
-static irqreturn_t xics_ipi_action_lpar(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t xics_ipi_action_lpar(int irq, void *dev_id)
 {
         int cpu = smp_processor_id();
 
         lpar_qirr_info(cpu, 0xff);
 
-        return xics_ipi_dispatch(cpu, regs);
+        return xics_ipi_dispatch(cpu);
 }
 
 void xics_cause_IPI(int cpu)
diff --git a/arch/powerpc/platforms/pseries/xics.h b/arch/powerpc/platforms/pseries/xics.h
index 6ee1055b0ffb..db0ec3ba3ae2 100644
--- a/arch/powerpc/platforms/pseries/xics.h
+++ b/arch/powerpc/platforms/pseries/xics.h
@@ -31,7 +31,6 @@ struct xics_ipi_struct {
 extern struct xics_ipi_struct xics_ipi_message[NR_CPUS] __cacheline_aligned;
 
 struct irq_desc;
-extern void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc,
-                                 struct pt_regs *regs);
+extern void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc);
 
 #endif /* _POWERPC_KERNEL_XICS_H */
diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
index 3ee03a9a98fa..195215560fd7 100644
--- a/arch/powerpc/sysdev/mpic.c
+++ b/arch/powerpc/sysdev/mpic.c
@@ -489,9 +489,9 @@ static inline void mpic_eoi(struct mpic *mpic)
 }
 
 #ifdef CONFIG_SMP
-static irqreturn_t mpic_ipi_action(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t mpic_ipi_action(int irq, void *dev_id)
 {
-        smp_message_recv(mpic_irq_to_hw(irq) - MPIC_VEC_IPI_0, regs);
+        smp_message_recv(mpic_irq_to_hw(irq) - MPIC_VEC_IPI_0);
         return IRQ_HANDLED;
 }
 #endif /* CONFIG_SMP */
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 708236f34746..5a854f36383c 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -21,6 +21,7 @@
 #include <linux/module.h>
 #include <linux/sysrq.h>
 #include <linux/interrupt.h>
+#include <linux/irq.h>
 
 #include <asm/ptrace.h>
 #include <asm/string.h>
@@ -2577,12 +2578,11 @@ void xmon_init(int enable)
 }
 
 #ifdef CONFIG_MAGIC_SYSRQ
-static void sysrq_handle_xmon(int key, struct pt_regs *pt_regs,
-                              struct tty_struct *tty) 
+static void sysrq_handle_xmon(int key, struct tty_struct *tty) 
 {
         /* ensure xmon is enabled */
         xmon_init(1);
-        debugger(pt_regs);
+        debugger(get_irq_regs());
 }
 
 static struct sysrq_key_op sysrq_xmon_op = 
diff --git a/arch/x86_64/kernel/apic.c b/arch/x86_64/kernel/apic.c
index 6472e321cad7..af4a1c71a80d 100644
--- a/arch/x86_64/kernel/apic.c
+++ b/arch/x86_64/kernel/apic.c
@@ -885,14 +885,14 @@ void setup_APIC_extened_lvt(unsigned char lvt_off, unsigned char vector,
  * value into /proc/profile.
  */
 
-void smp_local_timer_interrupt(struct pt_regs *regs)
+void smp_local_timer_interrupt(void)
 {
-        profile_tick(CPU_PROFILING, regs);
+        profile_tick(CPU_PROFILING);
 #ifdef CONFIG_SMP
-        update_process_times(user_mode(regs));
+        update_process_times(user_mode(get_irq_regs()));
 #endif
         if (apic_runs_main_timer > 1 && smp_processor_id() == boot_cpu_id)
-                main_timer_handler(regs);
+                main_timer_handler();
         /*
          * We take the 'long' return path, and there every subsystem
          * grabs the appropriate locks (kernel lock/ irq lock).
@@ -913,7 +913,7 @@ void smp_local_timer_interrupt(struct pt_regs *regs)
  * [ if a single-CPU system runs an SMP kernel then we call the local
  *   interrupt as well. Thus we cannot inline the local irq ... ]
  */
-void smp_apic_timer_interrupt(struct pt_regs *regs)
+void smp_apic_timer_interrupt(void)
 {
         /*
          * the NMI deadlock-detector uses this.
@@ -932,7 +932,7 @@ void smp_apic_timer_interrupt(struct pt_regs *regs)
          */
         exit_idle();
         irq_enter();
-        smp_local_timer_interrupt(regs);
+        smp_local_timer_interrupt();
         irq_exit();
 }
 
diff --git a/arch/x86_64/kernel/irq.c b/arch/x86_64/kernel/irq.c
index 506f27c85ca5..b8a407fcd5d5 100644
--- a/arch/x86_64/kernel/irq.c
+++ b/arch/x86_64/kernel/irq.c
@@ -103,7 +103,9 @@ skip:
  * handlers).
  */
 asmlinkage unsigned int do_IRQ(struct pt_regs *regs)
-{       
+{
+        struct pt_regs *old_regs = set_irq_regs(regs);
+
         /* high bit used in ret_from_ code  */
         unsigned vector = ~regs->orig_rax;
         unsigned irq;
@@ -121,9 +123,10 @@ asmlinkage unsigned int do_IRQ(struct pt_regs *regs)
 #ifdef CONFIG_DEBUG_STACKOVERFLOW
         stack_overflow_check(regs);
 #endif
-        generic_handle_irq(irq, regs);
+        generic_handle_irq(irq);
         irq_exit();
 
+        set_irq_regs(old_regs);
         return 1;
 }
 
diff --git a/arch/x86_64/kernel/time.c b/arch/x86_64/kernel/time.c
index 557e92af7bea..1ba5a442ac32 100644
--- a/arch/x86_64/kernel/time.c
+++ b/arch/x86_64/kernel/time.c
@@ -302,20 +302,20 @@ unsigned long long monotonic_clock(void)
 }
 EXPORT_SYMBOL(monotonic_clock);
 
-static noinline void handle_lost_ticks(int lost, struct pt_regs *regs)
+static noinline void handle_lost_ticks(int lost)
 {
         static long lost_count;
         static int warned;
         if (report_lost_ticks) {
                 printk(KERN_WARNING "time.c: Lost %d timer tick(s)! ", lost);
-                print_symbol("rip %s)\n", regs->rip);
+                print_symbol("rip %s)\n", get_irq_regs()->rip);
         }
 
         if (lost_count == 1000 && !warned) {
                 printk(KERN_WARNING "warning: many lost ticks.\n"
                        KERN_WARNING "Your time source seems to be instable or "
                                 "some driver is hogging interupts\n");
-                print_symbol("rip %s\n", regs->rip);
+                print_symbol("rip %s\n", get_irq_regs()->rip);
                 if (vxtime.mode == VXTIME_TSC && vxtime.hpet_address) {
                         printk(KERN_WARNING "Falling back to HPET\n");
                         if (hpet_use_timer)
@@ -339,7 +339,7 @@ static noinline void handle_lost_ticks(int lost, struct pt_regs *regs)
 #endif
 }
 
-void main_timer_handler(struct pt_regs *regs)
+void main_timer_handler(void)
 {
         static unsigned long rtc_update = 0;
         unsigned long tsc;
@@ -411,7 +411,7 @@ void main_timer_handler(struct pt_regs *regs)
         }
 
         if (lost > 0)
-                handle_lost_ticks(lost, regs);
+                handle_lost_ticks(lost);
         else
                 lost = 0;
 
@@ -421,7 +421,7 @@ void main_timer_handler(struct pt_regs *regs)
 
         do_timer(lost + 1);
 #ifndef CONFIG_SMP
-        update_process_times(user_mode(regs));
+        update_process_times(user_mode(get_irq_regs()));
 #endif
 
 /*
@@ -431,7 +431,7 @@ void main_timer_handler(struct pt_regs *regs)
  */
 
         if (!using_apic_timer)
-                smp_local_timer_interrupt(regs);
+                smp_local_timer_interrupt();
 
 /*
  * If we have an externally synchronized Linux clock, then update CMOS clock
@@ -450,11 +450,11 @@ void main_timer_handler(struct pt_regs *regs)
         write_sequnlock(&xtime_lock);
 }
 
-static irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t timer_interrupt(int irq, void *dev_id)
 {
         if (apic_runs_main_timer > 1)
                 return IRQ_HANDLED;
-        main_timer_handler(regs);
+        main_timer_handler();
         if (using_apic_timer)
                 smp_send_timer_broadcast_ipi();
         return IRQ_HANDLED;
@@ -1337,7 +1337,7 @@ irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id, struct pt_regs *regs)
         }
         if (call_rtc_interrupt) {
                 rtc_int_flag |= (RTC_IRQF | (RTC_NUM_INTS << 8));
-                rtc_interrupt(rtc_int_flag, dev_id, regs);
+                rtc_interrupt(rtc_int_flag, dev_id);
         }
         return IRQ_HANDLED;
 }