Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

7 files changed, 1009 insertions, 0 deletions

diff --git a/kernel/irq/Makefile b/kernel/irq/Makefile
new file mode 100644
index 000000000000..49378738ff5e
--- /dev/null
+++ b/kernel/irq/Makefile
@@ -0,0 +1,5 @@
+
+obj-y := handle.o manage.o spurious.o
+obj-$(CONFIG_GENERIC_IRQ_PROBE) += autoprobe.o
+obj-$(CONFIG_PROC_FS) += proc.o
+
diff --git a/kernel/irq/autoprobe.c b/kernel/irq/autoprobe.c
new file mode 100644
index 000000000000..98d62d8efeaf
--- /dev/null
+++ b/kernel/irq/autoprobe.c
@@ -0,0 +1,189 @@
+/*
+ * linux/kernel/irq/autoprobe.c
+ *
+ * Copyright (C) 1992, 1998-2004 Linus Torvalds, Ingo Molnar
+ *
+ * This file contains the interrupt probing code and driver APIs.
+ */
+
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+
+/*
+ * Autodetection depends on the fact that any interrupt that
+ * comes in on to an unassigned handler will get stuck with
+ * "IRQ_WAITING" cleared and the interrupt disabled.
+ */
+static DECLARE_MUTEX(probe_sem);
+
+/**
+ *      probe_irq_on    - begin an interrupt autodetect
+ *
+ *      Commence probing for an interrupt. The interrupts are scanned
+ *      and a mask of potential interrupt lines is returned.
+ *
+ */
+unsigned long probe_irq_on(void)
+{
+        unsigned long val, delay;
+        irq_desc_t *desc;
+        unsigned int i;
+
+        down(&probe_sem);
+        /*
+         * something may have generated an irq long ago and we want to
+         * flush such a longstanding irq before considering it as spurious.
+         */
+        for (i = NR_IRQS-1; i > 0; i--) {
+                desc = irq_desc + i;
+
+                spin_lock_irq(&desc->lock);
+                if (!irq_desc[i].action)
+                        irq_desc[i].handler->startup(i);
+                spin_unlock_irq(&desc->lock);
+        }
+
+        /* Wait for longstanding interrupts to trigger. */
+        for (delay = jiffies + HZ/50; time_after(delay, jiffies); )
+                /* about 20ms delay */ barrier();
+
+        /*
+         * enable any unassigned irqs
+         * (we must startup again here because if a longstanding irq
+         * happened in the previous stage, it may have masked itself)
+         */
+        for (i = NR_IRQS-1; i > 0; i--) {
+                desc = irq_desc + i;
+
+                spin_lock_irq(&desc->lock);
+                if (!desc->action) {
+                        desc->status |= IRQ_AUTODETECT | IRQ_WAITING;
+                        if (desc->handler->startup(i))
+                                desc->status |= IRQ_PENDING;
+                }
+                spin_unlock_irq(&desc->lock);
+        }
+
+        /*
+         * Wait for spurious interrupts to trigger
+         */
+        for (delay = jiffies + HZ/10; time_after(delay, jiffies); )
+                /* about 100ms delay */ barrier();
+
+        /*
+         * Now filter out any obviously spurious interrupts
+         */
+        val = 0;
+        for (i = 0; i < NR_IRQS; i++) {
+                irq_desc_t *desc = irq_desc + i;
+                unsigned int status;
+
+                spin_lock_irq(&desc->lock);
+                status = desc->status;
+
+                if (status & IRQ_AUTODETECT) {
+                        /* It triggered already - consider it spurious. */
+                        if (!(status & IRQ_WAITING)) {
+                                desc->status = status & ~IRQ_AUTODETECT;
+                                desc->handler->shutdown(i);
+                        } else
+                                if (i < 32)
+                                        val |= 1 << i;
+                }
+                spin_unlock_irq(&desc->lock);
+        }
+
+        return val;
+}
+
+EXPORT_SYMBOL(probe_irq_on);
+
+/**
+ *      probe_irq_mask - scan a bitmap of interrupt lines
+ *      @val:   mask of interrupts to consider
+ *
+ *      Scan the interrupt lines and return a bitmap of active
+ *      autodetect interrupts. The interrupt probe logic state
+ *      is then returned to its previous value.
+ *
+ *      Note: we need to scan all the irq's even though we will
+ *      only return autodetect irq numbers - just so that we reset
+ *      them all to a known state.
+ */
+unsigned int probe_irq_mask(unsigned long val)
+{
+        unsigned int mask;
+        int i;
+
+        mask = 0;
+        for (i = 0; i < NR_IRQS; i++) {
+                irq_desc_t *desc = irq_desc + i;
+                unsigned int status;
+
+                spin_lock_irq(&desc->lock);
+                status = desc->status;
+
+                if (status & IRQ_AUTODETECT) {
+                        if (i < 16 && !(status & IRQ_WAITING))
+                                mask |= 1 << i;
+
+                        desc->status = status & ~IRQ_AUTODETECT;
+                        desc->handler->shutdown(i);
+                }
+                spin_unlock_irq(&desc->lock);
+        }
+        up(&probe_sem);
+
+        return mask & val;
+}
+EXPORT_SYMBOL(probe_irq_mask);
+
+/**
+ *      probe_irq_off   - end an interrupt autodetect
+ *      @val: mask of potential interrupts (unused)
+ *
+ *      Scans the unused interrupt lines and returns the line which
+ *      appears to have triggered the interrupt. If no interrupt was
+ *      found then zero is returned. If more than one interrupt is
+ *      found then minus the first candidate is returned to indicate
+ *      their is doubt.
+ *
+ *      The interrupt probe logic state is returned to its previous
+ *      value.
+ *
+ *      BUGS: When used in a module (which arguably shouldn't happen)
+ *      nothing prevents two IRQ probe callers from overlapping. The
+ *      results of this are non-optimal.
+ */
+int probe_irq_off(unsigned long val)
+{
+        int i, irq_found = 0, nr_irqs = 0;
+
+        for (i = 0; i < NR_IRQS; i++) {
+                irq_desc_t *desc = irq_desc + i;
+                unsigned int status;
+
+                spin_lock_irq(&desc->lock);
+                status = desc->status;
+
+                if (status & IRQ_AUTODETECT) {
+                        if (!(status & IRQ_WAITING)) {
+                                if (!nr_irqs)
+                                        irq_found = i;
+                                nr_irqs++;
+                        }
+                        desc->status = status & ~IRQ_AUTODETECT;
+                        desc->handler->shutdown(i);
+                }
+                spin_unlock_irq(&desc->lock);
+        }
+        up(&probe_sem);
+
+        if (nr_irqs > 1)
+                irq_found = -irq_found;
+        return irq_found;
+}
+
+EXPORT_SYMBOL(probe_irq_off);
+
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
new file mode 100644
index 000000000000..2fb0e46e11f3
--- /dev/null
+++ b/kernel/irq/handle.c
@@ -0,0 +1,193 @@
+/*
+ * linux/kernel/irq/handle.c
+ *
+ * Copyright (C) 1992, 1998-2004 Linus Torvalds, Ingo Molnar
+ *
+ * This file contains the core interrupt handling code.
+ */
+
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/random.h>
+#include <linux/interrupt.h>
+#include <linux/kernel_stat.h>
+
+#include "internals.h"
+
+/*
+ * Linux has a controller-independent interrupt architecture.
+ * Every controller has a 'controller-template', that is used
+ * by the main code to do the right thing. Each driver-visible
+ * interrupt source is transparently wired to the apropriate
+ * controller. Thus drivers need not be aware of the
+ * interrupt-controller.
+ *
+ * The code is designed to be easily extended with new/different
+ * interrupt controllers, without having to do assembly magic or
+ * having to touch the generic code.
+ *
+ * Controller mappings for all interrupt sources:
+ */
+irq_desc_t irq_desc[NR_IRQS] __cacheline_aligned = {
+        [0 ... NR_IRQS-1] = {
+                .handler = &no_irq_type,
+                .lock = SPIN_LOCK_UNLOCKED
+        }
+};
+
+/*
+ * Generic 'no controller' code
+ */
+static void end_none(unsigned int irq) { }
+static void enable_none(unsigned int irq) { }
+static void disable_none(unsigned int irq) { }
+static void shutdown_none(unsigned int irq) { }
+static unsigned int startup_none(unsigned int irq) { return 0; }
+
+static void ack_none(unsigned int irq)
+{
+        /*
+         * 'what should we do if we get a hw irq event on an illegal vector'.
+         * each architecture has to answer this themself.
+         */
+        ack_bad_irq(irq);
+}
+
+struct hw_interrupt_type no_irq_type = {
+        .typename =     "none",
+        .startup =      startup_none,
+        .shutdown =     shutdown_none,
+        .enable =       enable_none,
+        .disable =      disable_none,
+        .ack =          ack_none,
+        .end =          end_none,
+        .set_affinity = NULL
+};
+
+/*
+ * Special, empty irq handler:
+ */
+irqreturn_t no_action(int cpl, void *dev_id, struct pt_regs *regs)
+{
+        return IRQ_NONE;
+}
+
+/*
+ * Have got an event to handle:
+ */
+fastcall int handle_IRQ_event(unsigned int irq, struct pt_regs *regs,
+                                struct irqaction *action)
+{
+        int ret, retval = 0, status = 0;
+
+        if (!(action->flags & SA_INTERRUPT))
+                local_irq_enable();
+
+        do {
+                ret = action->handler(irq, action->dev_id, regs);
+                if (ret == IRQ_HANDLED)
+                        status |= action->flags;
+                retval |= ret;
+                action = action->next;
+        } while (action);
+
+        if (status & SA_SAMPLE_RANDOM)
+                add_interrupt_randomness(irq);
+        local_irq_disable();
+
+        return retval;
+}
+
+/*
+ * do_IRQ handles all normal device IRQ's (the special
+ * SMP cross-CPU interrupts have their own specific
+ * handlers).
+ */
+fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs)
+{
+        irq_desc_t *desc = irq_desc + irq;
+        struct irqaction * action;
+        unsigned int status;
+
+        kstat_this_cpu.irqs[irq]++;
+        if (desc->status & IRQ_PER_CPU) {
+                irqreturn_t action_ret;
+
+                /*
+                 * No locking required for CPU-local interrupts:
+                 */
+                desc->handler->ack(irq);
+                action_ret = handle_IRQ_event(irq, regs, desc->action);
+                if (!noirqdebug)
+                        note_interrupt(irq, desc, action_ret);
+                desc->handler->end(irq);
+                return 1;
+        }
+
+        spin_lock(&desc->lock);
+        desc->handler->ack(irq);
+        /*
+         * REPLAY is when Linux resends an IRQ that was dropped earlier
+         * WAITING is used by probe to mark irqs that are being tested
+         */
+        status = desc->status & ~(IRQ_REPLAY | IRQ_WAITING);
+        status |= IRQ_PENDING; /* we _want_ to handle it */
+
+        /*
+         * If the IRQ is disabled for whatever reason, we cannot
+         * use the action we have.
+         */
+        action = NULL;
+        if (likely(!(status & (IRQ_DISABLED | IRQ_INPROGRESS)))) {
+                action = desc->action;
+                status &= ~IRQ_PENDING; /* we commit to handling */
+                status |= IRQ_INPROGRESS; /* we are handling it */
+        }
+        desc->status = status;
+
+        /*
+         * If there is no IRQ handler or it was disabled, exit early.
+         * Since we set PENDING, if another processor is handling
+         * a different instance of this same irq, the other processor
+         * will take care of it.
+         */
+        if (unlikely(!action))
+                goto out;
+
+        /*
+         * Edge triggered interrupts need to remember
+         * pending events.
+         * This applies to any hw interrupts that allow a second
+         * instance of the same irq to arrive while we are in do_IRQ
+         * or in the handler. But the code here only handles the _second_
+         * instance of the irq, not the third or fourth. So it is mostly
+         * useful for irq hardware that does not mask cleanly in an
+         * SMP environment.
+         */
+        for (;;) {
+                irqreturn_t action_ret;
+
+                spin_unlock(&desc->lock);
+
+                action_ret = handle_IRQ_event(irq, regs, action);
+
+                spin_lock(&desc->lock);
+                if (!noirqdebug)
+                        note_interrupt(irq, desc, action_ret);
+                if (likely(!(desc->status & IRQ_PENDING)))
+                        break;
+                desc->status &= ~IRQ_PENDING;
+        }
+        desc->status &= ~IRQ_INPROGRESS;
+
+out:
+        /*
+         * The ->end() handler has to deal with interrupts which got
+         * disabled while the handler was running.
+         */
+        desc->handler->end(irq);
+        spin_unlock(&desc->lock);
+
+        return 1;
+}
+
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
new file mode 100644
index 000000000000..46feba630266
--- /dev/null
+++ b/kernel/irq/internals.h
@@ -0,0 +1,18 @@
+/*
+ * IRQ subsystem internal functions and variables:
+ */
+
+extern int noirqdebug;
+
+#ifdef CONFIG_PROC_FS
+extern void register_irq_proc(unsigned int irq);
+extern void register_handler_proc(unsigned int irq, struct irqaction *action);
+extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
+#else
+static inline void register_irq_proc(unsigned int irq) { }
+static inline void register_handler_proc(unsigned int irq,
+                                         struct irqaction *action) { }
+static inline void unregister_handler_proc(unsigned int irq,
+                                           struct irqaction *action) { }
+#endif
+
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
new file mode 100644
index 000000000000..5202e4c4a5b6
--- /dev/null
+++ b/kernel/irq/manage.c
@@ -0,0 +1,349 @@
+/*
+ * linux/kernel/irq/manage.c
+ *
+ * Copyright (C) 1992, 1998-2004 Linus Torvalds, Ingo Molnar
+ *
+ * This file contains driver APIs to the irq subsystem.
+ */
+
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/random.h>
+#include <linux/interrupt.h>
+
+#include "internals.h"
+
+#ifdef CONFIG_SMP
+
+cpumask_t irq_affinity[NR_IRQS] = { [0 ... NR_IRQS-1] = CPU_MASK_ALL };
+
+/**
+ *      synchronize_irq - wait for pending IRQ handlers (on other CPUs)
+ *
+ *      This function waits for any pending IRQ handlers for this interrupt
+ *      to complete before returning. If you use this function while
+ *      holding a resource the IRQ handler may need you will deadlock.
+ *
+ *      This function may be called - with care - from IRQ context.
+ */
+void synchronize_irq(unsigned int irq)
+{
+        struct irq_desc *desc = irq_desc + irq;
+
+        while (desc->status & IRQ_INPROGRESS)
+                cpu_relax();
+}
+
+EXPORT_SYMBOL(synchronize_irq);
+
+#endif
+
+/**
+ *      disable_irq_nosync - disable an irq without waiting
+ *      @irq: Interrupt to disable
+ *
+ *      Disable the selected interrupt line.  Disables and Enables are
+ *      nested.
+ *      Unlike disable_irq(), this function does not ensure existing
+ *      instances of the IRQ handler have completed before returning.
+ *
+ *      This function may be called from IRQ context.
+ */
+void disable_irq_nosync(unsigned int irq)
+{
+        irq_desc_t *desc = irq_desc + irq;
+        unsigned long flags;
+
+        spin_lock_irqsave(&desc->lock, flags);
+        if (!desc->depth++) {
+                desc->status |= IRQ_DISABLED;
+                desc->handler->disable(irq);
+        }
+        spin_unlock_irqrestore(&desc->lock, flags);
+}
+
+EXPORT_SYMBOL(disable_irq_nosync);
+
+/**
+ *      disable_irq - disable an irq and wait for completion
+ *      @irq: Interrupt to disable
+ *
+ *      Disable the selected interrupt line.  Enables and Disables are
+ *      nested.
+ *      This function waits for any pending IRQ handlers for this interrupt
+ *      to complete before returning. If you use this function while
+ *      holding a resource the IRQ handler may need you will deadlock.
+ *
+ *      This function may be called - with care - from IRQ context.
+ */
+void disable_irq(unsigned int irq)
+{
+        irq_desc_t *desc = irq_desc + irq;
+
+        disable_irq_nosync(irq);
+        if (desc->action)
+                synchronize_irq(irq);
+}
+
+EXPORT_SYMBOL(disable_irq);
+
+/**
+ *      enable_irq - enable handling of an irq
+ *      @irq: Interrupt to enable
+ *
+ *      Undoes the effect of one call to disable_irq().  If this
+ *      matches the last disable, processing of interrupts on this
+ *      IRQ line is re-enabled.
+ *
+ *      This function may be called from IRQ context.
+ */
+void enable_irq(unsigned int irq)
+{
+        irq_desc_t *desc = irq_desc + irq;
+        unsigned long flags;
+
+        spin_lock_irqsave(&desc->lock, flags);
+        switch (desc->depth) {
+        case 0:
+                WARN_ON(1);
+                break;
+        case 1: {
+                unsigned int status = desc->status & ~IRQ_DISABLED;
+
+                desc->status = status;
+                if ((status & (IRQ_PENDING | IRQ_REPLAY)) == IRQ_PENDING) {
+                        desc->status = status | IRQ_REPLAY;
+                        hw_resend_irq(desc->handler,irq);
+                }
+                desc->handler->enable(irq);
+                /* fall-through */
+        }
+        default:
+                desc->depth--;
+        }
+        spin_unlock_irqrestore(&desc->lock, flags);
+}
+
+EXPORT_SYMBOL(enable_irq);
+
+/*
+ * Internal function that tells the architecture code whether a
+ * particular irq has been exclusively allocated or is available
+ * for driver use.
+ */
+int can_request_irq(unsigned int irq, unsigned long irqflags)
+{
+        struct irqaction *action;
+
+        if (irq >= NR_IRQS)
+                return 0;
+
+        action = irq_desc[irq].action;
+        if (action)
+                if (irqflags & action->flags & SA_SHIRQ)
+                        action = NULL;
+
+        return !action;
+}
+
+/*
+ * Internal function to register an irqaction - typically used to
+ * allocate special interrupts that are part of the architecture.
+ */
+int setup_irq(unsigned int irq, struct irqaction * new)
+{
+        struct irq_desc *desc = irq_desc + irq;
+        struct irqaction *old, **p;
+        unsigned long flags;
+        int shared = 0;
+
+        if (desc->handler == &no_irq_type)
+                return -ENOSYS;
+        /*
+         * Some drivers like serial.c use request_irq() heavily,
+         * so we have to be careful not to interfere with a
+         * running system.
+         */
+        if (new->flags & SA_SAMPLE_RANDOM) {
+                /*
+                 * This function might sleep, we want to call it first,
+                 * outside of the atomic block.
+                 * Yes, this might clear the entropy pool if the wrong
+                 * driver is attempted to be loaded, without actually
+                 * installing a new handler, but is this really a problem,
+                 * only the sysadmin is able to do this.
+                 */
+                rand_initialize_irq(irq);
+        }
+
+        /*
+         * The following block of code has to be executed atomically
+         */
+        spin_lock_irqsave(&desc->lock,flags);
+        p = &desc->action;
+        if ((old = *p) != NULL) {
+                /* Can't share interrupts unless both agree to */
+                if (!(old->flags & new->flags & SA_SHIRQ)) {
+                        spin_unlock_irqrestore(&desc->lock,flags);
+                        return -EBUSY;
+                }
+
+                /* add new interrupt at end of irq queue */
+                do {
+                        p = &old->next;
+                        old = *p;
+                } while (old);
+                shared = 1;
+        }
+
+        *p = new;
+
+        if (!shared) {
+                desc->depth = 0;
+                desc->status &= ~(IRQ_DISABLED | IRQ_AUTODETECT |
+                                  IRQ_WAITING | IRQ_INPROGRESS);
+                if (desc->handler->startup)
+                        desc->handler->startup(irq);
+                else
+                        desc->handler->enable(irq);
+        }
+        spin_unlock_irqrestore(&desc->lock,flags);
+
+        new->irq = irq;
+        register_irq_proc(irq);
+        new->dir = NULL;
+        register_handler_proc(irq, new);
+
+        return 0;
+}
+
+/**
+ *      free_irq - free an interrupt
+ *      @irq: Interrupt line to free
+ *      @dev_id: Device identity to free
+ *
+ *      Remove an interrupt handler. The handler is removed and if the
+ *      interrupt line is no longer in use by any driver it is disabled.
+ *      On a shared IRQ the caller must ensure the interrupt is disabled
+ *      on the card it drives before calling this function. The function
+ *      does not return until any executing interrupts for this IRQ
+ *      have completed.
+ *
+ *      This function must not be called from interrupt context.
+ */
+void free_irq(unsigned int irq, void *dev_id)
+{
+        struct irq_desc *desc;
+        struct irqaction **p;
+        unsigned long flags;
+
+        if (irq >= NR_IRQS)
+                return;
+
+        desc = irq_desc + irq;
+        spin_lock_irqsave(&desc->lock,flags);
+        p = &desc->action;
+        for (;;) {
+                struct irqaction * action = *p;
+
+                if (action) {
+                        struct irqaction **pp = p;
+
+                        p = &action->next;
+                        if (action->dev_id != dev_id)
+                                continue;
+
+                        /* Found it - now remove it from the list of entries */
+                        *pp = action->next;
+                        if (!desc->action) {
+                                desc->status |= IRQ_DISABLED;
+                                if (desc->handler->shutdown)
+                                        desc->handler->shutdown(irq);
+                                else
+                                        desc->handler->disable(irq);
+                        }
+                        spin_unlock_irqrestore(&desc->lock,flags);
+                        unregister_handler_proc(irq, action);
+
+                        /* Make sure it's not being used on another CPU */
+                        synchronize_irq(irq);
+                        kfree(action);
+                        return;
+                }
+                printk(KERN_ERR "Trying to free free IRQ%d\n",irq);
+                spin_unlock_irqrestore(&desc->lock,flags);
+                return;
+        }
+}
+
+EXPORT_SYMBOL(free_irq);
+
+/**
+ *      request_irq - allocate an interrupt line
+ *      @irq: Interrupt line to allocate
+ *      @handler: Function to be called when the IRQ occurs
+ *      @irqflags: Interrupt type flags
+ *      @devname: An ascii name for the claiming device
+ *      @dev_id: A cookie passed back to the handler function
+ *
+ *      This call allocates interrupt resources and enables the
+ *      interrupt line and IRQ handling. From the point this
+ *      call is made your handler function may be invoked. Since
+ *      your handler function must clear any interrupt the board
+ *      raises, you must take care both to initialise your hardware
+ *      and to set up the interrupt handler in the right order.
+ *
+ *      Dev_id must be globally unique. Normally the address of the
+ *      device data structure is used as the cookie. Since the handler
+ *      receives this value it makes sense to use it.
+ *
+ *      If your interrupt is shared you must pass a non NULL dev_id
+ *      as this is required when freeing the interrupt.
+ *
+ *      Flags:
+ *
+ *      SA_SHIRQ                Interrupt is shared
+ *      SA_INTERRUPT            Disable local interrupts while processing
+ *      SA_SAMPLE_RANDOM        The interrupt can be used for entropy
+ *
+ */
+int request_irq(unsigned int irq,
+                irqreturn_t (*handler)(int, void *, struct pt_regs *),
+                unsigned long irqflags, const char * devname, void *dev_id)
+{
+        struct irqaction * action;
+        int retval;
+
+        /*
+         * Sanity-check: shared interrupts must pass in a real dev-ID,
+         * otherwise we'll have trouble later trying to figure out
+         * which interrupt is which (messes up the interrupt freeing
+         * logic etc).
+         */
+        if ((irqflags & SA_SHIRQ) && !dev_id)
+                return -EINVAL;
+        if (irq >= NR_IRQS)
+                return -EINVAL;
+        if (!handler)
+                return -EINVAL;
+
+        action = kmalloc(sizeof(struct irqaction), GFP_ATOMIC);
+        if (!action)
+                return -ENOMEM;
+
+        action->handler = handler;
+        action->flags = irqflags;
+        cpus_clear(action->mask);
+        action->name = devname;
+        action->next = NULL;
+        action->dev_id = dev_id;
+
+        retval = setup_irq(irq, action);
+        if (retval)
+                kfree(action);
+
+        return retval;
+}
+
+EXPORT_SYMBOL(request_irq);
+
diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
new file mode 100644
index 000000000000..85d08daa6600
--- /dev/null
+++ b/kernel/irq/proc.c
@@ -0,0 +1,159 @@
+/*
+ * linux/kernel/irq/proc.c
+ *
+ * Copyright (C) 1992, 1998-2004 Linus Torvalds, Ingo Molnar
+ *
+ * This file contains the /proc/irq/ handling code.
+ */
+
+#include <linux/irq.h>
+#include <linux/proc_fs.h>
+#include <linux/interrupt.h>
+
+static struct proc_dir_entry *root_irq_dir, *irq_dir[NR_IRQS];
+
+#ifdef CONFIG_SMP
+
+/*
+ * The /proc/irq/<irq>/smp_affinity values:
+ */
+static struct proc_dir_entry *smp_affinity_entry[NR_IRQS];
+
+void __attribute__((weak))
+proc_set_irq_affinity(unsigned int irq, cpumask_t mask_val)
+{
+        irq_affinity[irq] = mask_val;
+        irq_desc[irq].handler->set_affinity(irq, mask_val);
+}
+
+static int irq_affinity_read_proc(char *page, char **start, off_t off,
+                                  int count, int *eof, void *data)
+{
+        int len = cpumask_scnprintf(page, count, irq_affinity[(long)data]);
+
+        if (count - len < 2)
+                return -EINVAL;
+        len += sprintf(page + len, "\n");
+        return len;
+}
+
+int no_irq_affinity;
+static int irq_affinity_write_proc(struct file *file, const char __user *buffer,
+                                   unsigned long count, void *data)
+{
+        unsigned int irq = (int)(long)data, full_count = count, err;
+        cpumask_t new_value, tmp;
+
+        if (!irq_desc[irq].handler->set_affinity || no_irq_affinity)
+                return -EIO;
+
+        err = cpumask_parse(buffer, count, new_value);
+        if (err)
+                return err;
+
+        /*
+         * Do not allow disabling IRQs completely - it's a too easy
+         * way to make the system unusable accidentally :-) At least
+         * one online CPU still has to be targeted.
+         */
+        cpus_and(tmp, new_value, cpu_online_map);
+        if (cpus_empty(tmp))
+                return -EINVAL;
+
+        proc_set_irq_affinity(irq, new_value);
+
+        return full_count;
+}
+
+#endif
+
+#define MAX_NAMELEN 128
+
+static int name_unique(unsigned int irq, struct irqaction *new_action)
+{
+        struct irq_desc *desc = irq_desc + irq;
+        struct irqaction *action;
+
+        for (action = desc->action ; action; action = action->next)
+                if ((action != new_action) && action->name &&
+                                !strcmp(new_action->name, action->name))
+                        return 0;
+        return 1;
+}
+
+void register_handler_proc(unsigned int irq, struct irqaction *action)
+{
+        char name [MAX_NAMELEN];
+
+        if (!irq_dir[irq] || action->dir || !action->name ||
+                                        !name_unique(irq, action))
+                return;
+
+        memset(name, 0, MAX_NAMELEN);
+        snprintf(name, MAX_NAMELEN, "%s", action->name);
+
+        /* create /proc/irq/1234/handler/ */
+        action->dir = proc_mkdir(name, irq_dir[irq]);
+}
+
+#undef MAX_NAMELEN
+
+#define MAX_NAMELEN 10
+
+void register_irq_proc(unsigned int irq)
+{
+        char name [MAX_NAMELEN];
+
+        if (!root_irq_dir ||
+                (irq_desc[irq].handler == &no_irq_type) ||
+                        irq_dir[irq])
+                return;
+
+        memset(name, 0, MAX_NAMELEN);
+        sprintf(name, "%d", irq);
+
+        /* create /proc/irq/1234 */
+        irq_dir[irq] = proc_mkdir(name, root_irq_dir);
+
+#ifdef CONFIG_SMP
+        {
+                struct proc_dir_entry *entry;
+
+                /* create /proc/irq/<irq>/smp_affinity */
+                entry = create_proc_entry("smp_affinity", 0600, irq_dir[irq]);
+
+                if (entry) {
+                        entry->nlink = 1;
+                        entry->data = (void *)(long)irq;
+                        entry->read_proc = irq_affinity_read_proc;
+                        entry->write_proc = irq_affinity_write_proc;
+                }
+                smp_affinity_entry[irq] = entry;
+        }
+#endif
+}
+
+#undef MAX_NAMELEN
+
+void unregister_handler_proc(unsigned int irq, struct irqaction *action)
+{
+        if (action->dir)
+                remove_proc_entry(action->dir->name, irq_dir[irq]);
+}
+
+void init_irq_proc(void)
+{
+        int i;
+
+        /* create /proc/irq */
+        root_irq_dir = proc_mkdir("irq", NULL);
+        if (!root_irq_dir)
+                return;
+
+        /*
+         * Create entries for all existing IRQs.
+         */
+        for (i = 0; i < NR_IRQS; i++)
+                register_irq_proc(i);
+}
+
diff --git a/kernel/irq/spurious.c b/kernel/irq/spurious.c
new file mode 100644
index 000000000000..f6297c306905
--- /dev/null
+++ b/kernel/irq/spurious.c
@@ -0,0 +1,96 @@
+/*
+ * linux/kernel/irq/spurious.c
+ *
+ * Copyright (C) 1992, 1998-2004 Linus Torvalds, Ingo Molnar
+ *
+ * This file contains spurious interrupt handling.
+ */
+
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/kallsyms.h>
+#include <linux/interrupt.h>
+
+/*
+ * If 99,900 of the previous 100,000 interrupts have not been handled
+ * then assume that the IRQ is stuck in some manner. Drop a diagnostic
+ * and try to turn the IRQ off.
+ *
+ * (The other 100-of-100,000 interrupts may have been a correctly
+ *  functioning device sharing an IRQ with the failing one)
+ *
+ * Called under desc->lock
+ */
+
+static void
+__report_bad_irq(unsigned int irq, irq_desc_t *desc, irqreturn_t action_ret)
+{
+        struct irqaction *action;
+
+        if (action_ret != IRQ_HANDLED && action_ret != IRQ_NONE) {
+                printk(KERN_ERR "irq event %d: bogus return value %x\n",
+                                irq, action_ret);
+        } else {
+                printk(KERN_ERR "irq %d: nobody cared!\n", irq);
+        }
+        dump_stack();
+        printk(KERN_ERR "handlers:\n");
+        action = desc->action;
+        while (action) {
+                printk(KERN_ERR "[<%p>]", action->handler);
+                print_symbol(" (%s)",
+                        (unsigned long)action->handler);
+                printk("\n");
+                action = action->next;
+        }
+}
+
+void report_bad_irq(unsigned int irq, irq_desc_t *desc, irqreturn_t action_ret)
+{
+        static int count = 100;
+
+        if (count > 0) {
+                count--;
+                __report_bad_irq(irq, desc, action_ret);
+        }
+}
+
+void note_interrupt(unsigned int irq, irq_desc_t *desc, irqreturn_t action_ret)
+{
+        if (action_ret != IRQ_HANDLED) {
+                desc->irqs_unhandled++;
+                if (action_ret != IRQ_NONE)
+                        report_bad_irq(irq, desc, action_ret);
+        }
+
+        desc->irq_count++;
+        if (desc->irq_count < 100000)
+                return;
+
+        desc->irq_count = 0;
+        if (desc->irqs_unhandled > 99900) {
+                /*
+                 * The interrupt is stuck
+                 */
+                __report_bad_irq(irq, desc, action_ret);
+                /*
+                 * Now kill the IRQ
+                 */
+                printk(KERN_EMERG "Disabling IRQ #%d\n", irq);
+                desc->status |= IRQ_DISABLED;
+                desc->handler->disable(irq);
+        }
+        desc->irqs_unhandled = 0;
+}
+
+int noirqdebug;
+
+int __init noirqdebug_setup(char *str)
+{
+        noirqdebug = 1;
+        printk(KERN_INFO "IRQ lockup detection disabled\n");
+        return 1;
+}
+
+__setup("noirqdebug", noirqdebug_setup);
+