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    Subject[PATCH][RFC] irq handling code consolidation (common part)
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    Hi all,

    the irq handling consolidation patch returns from the dead !
    Now with runaway irq detection code included !

    This patch (against 2.5.73) contains common part of it.

    Please take a look.

    Best regards.

    --
    Andrey Panin | Linux and UNIX system administrator
    pazke@donpac.ru | PGP key: wwwkeys.pgp.net
    diff --minimal -urN -X /usr/share/dontdiff linux-2.5.72.vanilla/kernel/irq.c linux-2.5.72/kernel/irq.c
    --- linux-2.5.72.vanilla/kernel/irq.c 1970-01-01 03:00:00.000000000 +0300
    +++ linux-2.5.72/kernel/irq.c 2003-06-17 23:01:44.000000000 +0400
    @@ -0,0 +1,904 @@
    +/*
    + * linux/kernel/irq.c
    + *
    + * Architecture independent parts of IRQ handling.
    + *
    + * Copyright (C) 1992-2002 Linus Torvalds.
    + *
    + * Modified from the alpha version by Andrey Panin.
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License version 2 as
    + * published by the Free Software Foundation.
    + */
    +
    +/*
    + * This file contains the code used by various IRQ handling routines:
    + * asking for different IRQ's should be done through these routines
    + * instead of just grabbing them. Thus setups with different IRQ numbers
    + * shouldn't result in any weird surprises, and installing new handlers
    + * should be easier.
    + *
    + * IRQs are in fact implemented a bit like signal handlers for the kernel.
    + * Naturally it's not a 1:1 relation, but there are similarities.
    + *
    + * Linux has a controller-independent x86 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.
    + */
    +
    +#include <linux/config.h>
    +#include <linux/slab.h>
    +#include <linux/errno.h>
    +#include <linux/signal.h>
    +#include <linux/irq.h>
    +#include <linux/interrupt.h>
    +#include <linux/random.h>
    +#include <linux/jiffies.h>
    +#include <linux/proc_fs.h>
    +#include <linux/stringify.h>
    +#include <linux/kallsyms.h>
    +
    +#include <asm/param.h>
    +#include <asm/semaphore.h>
    +#include <asm/hw_irq.h>
    +#include <asm/uaccess.h>
    +
    +#ifndef HAVE_ARCH_IRQ_DESC
    +
    +/*
    + * 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,
    + }
    +};
    +
    +#endif
    +
    +/*
    + * Special irq handlers.
    + */
    +
    +irqreturn_t no_action(int cpl, void *dev_id, struct pt_regs *regs)
    +{
    + return IRQ_NONE;
    +}
    +
    +/*
    + * Generic no controller code
    + */
    +atomic_t irq_err_count;
    +
    +static void no_irq_enable_disable(unsigned int irq) { }
    +static unsigned int no_irq_startup(unsigned int irq) { return 0; }
    +
    +static void no_irq_ack(unsigned int irq)
    +{
    + atomic_inc(&irq_err_count);
    + printk(KERN_CRIT "Unexpected IRQ trap at vector %u\n", irq);
    + arch_ack_bad_irq(irq);
    +}
    +
    +struct hw_interrupt_type no_irq_type = {
    + .typename = "none",
    + .startup = no_irq_startup,
    + .shutdown = no_irq_enable_disable,
    + .enable = no_irq_enable_disable,
    + .disable = no_irq_enable_disable,
    + .ack = no_irq_ack,
    + .end = no_irq_enable_disable,
    +};
    +
    +/*
    + * This should really return information about whether
    + * we should do bottom half handling etc. Right now we
    + * end up _always_ checking the bottom half, which is a
    + * waste of time and is not what some drivers would
    + * prefer.
    + */
    +int handle_IRQ_event(unsigned int irq, struct pt_regs *regs,
    + struct irqaction *action)
    +{
    + int status = 1; /* Force the "do bottom halves" bit */
    + int retval = 0;
    +
    + if (!(action->flags & SA_INTERRUPT))
    + local_irq_enable();
    +
    + do {
    + status |= action->flags;
    + retval |= action->handler(irq, action->dev_id, regs);
    + action = action->next;
    + } while (action);
    +
    + if (status & SA_SAMPLE_RANDOM)
    + add_interrupt_randomness(irq);
    +
    + local_irq_disable();
    +
    + return retval;
    +}
    +
    +static void __report_bad_irq(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;
    + do {
    + printk(KERN_ERR "[<%p>]", action->handler);
    + print_symbol(" (%s)",
    + (unsigned long)action->handler);
    + printk("\n");
    + action = action->next;
    + } while (action);
    +}
    +
    +static void report_bad_irq(int irq, irq_desc_t *desc, irqreturn_t action_ret)
    +{
    + static int count = 100;
    +
    + if (count) {
    + count--;
    + __report_bad_irq(irq, desc, action_ret);
    + }
    +}
    +
    +int noirqdebug;
    +
    +static int __init noirqdebug_setup(char *str)
    +{
    + noirqdebug = 1;
    + printk(KERN_INFO "IRQ lockup detection disabled\n");
    + return 1;
    +}
    +
    +__setup("noirqdebug", noirqdebug_setup);
    +
    +/*
    + * 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
    + */
    +void __note_interrupt(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;
    +}
    +
    +#if defined(CONFIG_SMP) && !defined(HAVE_ARCH_SYNCRONIZE_IRQ)
    +
    +inline void synchronize_irq(unsigned int irq)
    +{
    + irq_desc_t *desc = irq_desc(irq);
    +
    + /* is there anything to synchronize with? */
    + if (!desc->action)
    + return;
    +
    + while (desc->status & IRQ_INPROGRESS)
    + cpu_relax();
    +}
    +
    +#endif
    +
    +/*
    + * Workarounds for interrupt types without startup()/shutdown() (ppc, ppc64).
    + * Will be removed some day.
    + */
    +
    +static int startup_irq(unsigned int irq)
    +{
    + irq_desc_t *desc = irq_desc(irq);
    +
    + if (desc->handler->startup)
    + return desc->handler->startup(irq);
    + else if (desc->handler->enable)
    + desc->handler->enable(irq);
    + else
    + BUG();
    + return 0;
    +}
    +
    +static void shutdown_irq(unsigned int irq)
    +{
    + irq_desc_t *desc = irq_desc(irq);
    +
    + if (desc->handler->shutdown)
    + desc->handler->shutdown(irq);
    + else if (desc->handler->disable)
    + desc->handler->disable(irq);
    + else
    + BUG();
    +}
    +
    +/*
    + * Generic enable/disable code: this just calls
    + * down into the PIC-specific version for the actual
    + * hardware disable after having gotten the irq
    + * controller lock.
    + */
    +
    +/**
    + * 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.
    + */
    +inline 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++) {
    + /* Needed for ppc & ppc64, doesn't harm others (really ?) */
    + if (!(desc->status & IRQ_PER_CPU))
    + desc->status |= IRQ_DISABLED;
    + desc->handler->disable(irq);
    + }
    + spin_unlock_irqrestore(&desc->lock, flags);
    +}
    +
    +/**
    + * disable_irq - disable an irq and wait for completion
    + * @irq: Interrupt to disable
    + *
    + * Disable the selected interrupt line. Enables and Disables are
    + * nested. That is for two disables you need two enables.
    + * 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)
    +{
    + disable_irq_nosync(irq);
    + synchronize_irq(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 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--;
    + break;
    + case 0:
    + printk(KERN_ERR "enable_irq(%u) unbalanced from %p\n",
    + irq, __builtin_return_address(0));
    + }
    + spin_unlock_irqrestore(&desc->lock, flags);
    +}
    +
    +/**
    + * 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)
    +{
    + int retval;
    + struct irqaction *action;
    +
    + /*
    + * Sanity-check: shared interrupts should REALLY 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) {
    + if (!dev_id)
    + printk(KERN_ERR "Bad boy: %s (at %p) called us " \
    + "without a dev_id!\n", devname,
    + __builtin_return_address(0));
    + }
    +
    + if (!irq_valid(irq) || !handler)
    + return -EINVAL;
    +
    + action = kmalloc(sizeof(struct irqaction), GFP_ATOMIC);
    + if (!action)
    + return -ENOMEM;
    +
    + action->handler = handler;
    + action->flags = irqflags;
    + action->mask = 0;
    + action->name = devname;
    + action->next = NULL;
    + action->dev_id = dev_id;
    +
    + retval = setup_irq(irq, action);
    + if (retval)
    + kfree(action);
    + return retval;
    +}
    +
    +#ifndef HAVE_ARCH_IRQ_PROC
    +void register_irq_proc(unsigned int irq);
    +#endif
    +
    +int setup_irq(unsigned int irq, struct irqaction *new)
    +{
    + int shared = 0;
    + unsigned long flags;
    + struct irqaction *old, **p;
    + irq_desc_t *desc = irq_desc(irq);
    +
    + 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);
    + }
    +
    + arch_setup_irq(irq, desc, new);
    +
    + /*
    + * 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 &= ARCH_NONSHARED_IRQ_MASK;
    + startup_irq(irq);
    + }
    + spin_unlock_irqrestore(&desc->lock, flags);
    +
    + register_irq_proc(irq);
    +
    + 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)
    +{
    + irq_desc_t *desc;
    + struct irqaction **p;
    + unsigned long flags;
    +
    + if (!irq_valid(irq)) {
    + printk(KERN_CRIT "Trying to free IRQ%d\n", irq);
    + 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;
    + shutdown_irq(irq);
    + }
    + spin_unlock_irqrestore(&desc->lock, flags);
    +
    + /* Wait to make sure it's not being used on another CPU */
    + synchronize_irq(irq);
    + kfree(action);
    + return;
    + }
    + printk(KERN_CRIT "Trying to free free IRQ%d\n", irq);
    + spin_unlock_irqrestore(&desc->lock, flags);
    + return;
    + }
    +}
    +
    +#ifndef HAVE_ARCH_IRQ_PROBE
    +
    +/*
    + * IRQ autodetection code..
    + *
    + * This 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 int i;
    + irq_desc_t *desc;
    + unsigned long val;
    + unsigned long delay;
    +
    + 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 (!desc->action)
    + startup_irq(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 (startup_irq(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;
    + shutdown_irq(i);
    + } else
    + if (i < 32)
    + val |= 1 << i;
    + }
    + spin_unlock_irq(&desc->lock);
    + }
    +
    + return val;
    +}
    +
    +/**
    + * probe_irq_mask - scan a bitmap of interrupt lines
    + * @val: mask of interrupts to consider
    + *
    + * Scan the ISA bus interrupt lines and return a bitmap of
    + * active interrupts. The interrupt probe logic state is then
    + * returned to its previous value. This function can handle only
    + * legacy ISA interrupts
    + *
    + * Note: we need to scan all the irq's even though we will
    + * only return ISA irq numbers - just so that we reset them
    + * all to a known state.
    + */
    +unsigned int probe_irq_mask(unsigned long val)
    +{
    + int i;
    + unsigned int mask;
    +
    + 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;
    + shutdown_irq(i);
    + }
    + spin_unlock_irq(&desc->lock);
    + }
    + up(&probe_sem);
    +
    + return mask & val;
    +}
    +
    +/**
    + * 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. This function can handle any interrupt source.
    + *
    + * The interrupt probe logic state is returned to its previous
    + * value.
    + *
    + * BUGS: When used in a module (which arguably shouldnt 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, nr_irqs;
    +
    + nr_irqs = 0;
    + irq_found = 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;
    + shutdown_irq(i);
    + }
    + spin_unlock_irq(&desc->lock);
    + }
    + up(&probe_sem);
    +
    + if (nr_irqs > 1)
    + irq_found = -irq_found;
    + return irq_found;
    +}
    +
    +#endif /* HAVE_ARCH_IRQ_PROBE */
    +
    +#ifndef HAVE_ARCH_IRQ_PROC
    +
    +unsigned int parse_hex_value(const char __user *buffer, unsigned long count,
    + unsigned long *ret)
    +{
    + unsigned char hexnum[ARCH_AFFINITY_WIDTH];
    + unsigned long value, i;
    +
    + if (!count)
    + return -EINVAL;
    + if (count > ARCH_AFFINITY_WIDTH)
    + count = ARCH_AFFINITY_WIDTH;
    + if (copy_from_user(hexnum, buffer, count))
    + return -EFAULT;
    +
    + /*
    + * Parse the first ARCH_AFFINITY_WIDTH characters as a hex
    + * string, any non-hex char is end-of-string. '00e1', 'e1', '00E1',
    + * 'E1' are all the same.
    + */
    + value = 0;
    +
    + for (i = 0; i < count; i++) {
    + unsigned int c = hexnum[i];
    +
    + switch (c) {
    + case '0' ... '9': c -= '0'; break;
    + case 'a' ... 'f': c -= 'a' - 10; break;
    + case 'A' ... 'F': c -= 'A' - 10; break;
    + default:
    + goto out;
    + }
    + value = (value << 4) | c;
    + }
    +out:
    + *ret = value;
    + return 0;
    +}
    +
    +#define MAX_NAMELEN 10
    +
    +struct proc_dir_entry *root_irq_dir;
    +static struct proc_dir_entry *irq_dir[NR_IRQS];
    +
    +#ifdef CONFIG_SMP
    +static struct proc_dir_entry *smp_affinity_entry[NR_IRQS];
    +
    +unsigned long irq_affinity[NR_IRQS] = {
    + [0 ... NR_IRQS - 1] = ARCH_DEFAULT_IRQ_AFFINITY
    +};
    +
    +static int irq_affinity_read_proc(char *page, char **start, off_t off,
    + int count, int *eof, void *data)
    +{
    + if (count < ARCH_AFFINITY_WIDTH + 1)
    + return -EINVAL;
    + return sprintf (page, "%0" __stringify(ARCH_AFFINITY_WIDTH) "lx\n",
    + irq_affinity[(long)data]);
    +}
    +
    +static int irq_affinity_write_proc(struct file *file, const char __user *buffer,
    + unsigned long count, void *data)
    +{
    + int irq = (long) data, full_count = count, err;
    + unsigned long new_value;
    +
    + if (!irq_desc(irq)->handler->set_affinity)
    + return -EIO;
    +
    + err = parse_hex_value(buffer, count, &new_value);
    +
    + /*
    + * 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.
    + */
    + if (!(new_value & cpu_online_map))
    + return -EINVAL;
    +
    + irq_affinity[irq] = new_value;
    + irq_desc(irq)->handler->set_affinity(irq, new_value);
    +
    + return full_count;
    +}
    +#endif
    +
    +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
    + if (irq_desc(irq)->handler->set_affinity) {
    + struct proc_dir_entry *entry;
    +
    + /* create /proc/irq/1234/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
    +}
    +
    +#ifdef CONFIG_SMP
    +
    +unsigned long prof_cpu_mask = ~0UL;
    +
    +static int prof_cpu_mask_read_proc(char *page, char **start, off_t off,
    + int count, int *eof, void *data)
    +{
    + unsigned long *mask = (unsigned long *) data;
    + if (count < ARCH_AFFINITY_WIDTH + 1)
    + return -EINVAL;
    + return sprintf (page, "%0" __stringify(ARCH_AFFINITY_WIDTH) "lx\n",
    + *mask);
    +}
    +
    +static int prof_cpu_mask_write_proc(struct file *file, const char __user *buffer,
    + unsigned long count, void *data)
    +{
    + unsigned long *mask = (unsigned long *) data, full_count = count, err;
    + unsigned long new_value;
    +
    + err = parse_hex_value(buffer, count, &new_value);
    + if (err)
    + return err;
    +
    + *mask = new_value;
    + return full_count;
    +}
    +#endif
    +
    +void init_irq_proc(void)
    +{
    + int i;
    +
    + /* create /proc/irq */
    + root_irq_dir = proc_mkdir("irq", 0);
    +
    +#ifdef CONFIG_SMP
    + {
    + struct proc_dir_entry *entry;
    +
    + /* create /proc/irq/prof_cpu_mask */
    + entry = create_proc_entry("prof_cpu_mask", 0600, root_irq_dir);
    + if (!entry)
    + return;
    +
    + entry->nlink = 1;
    + entry->data = (void *)&prof_cpu_mask;
    + entry->read_proc = prof_cpu_mask_read_proc;
    + entry->write_proc = prof_cpu_mask_write_proc;
    + }
    +#endif
    +
    + /*
    + * Create entries for all existing IRQs.
    + */
    + if (arch_can_create_irq_proc())
    + for (i = 0; irq_valid(i); i++)
    + if (irq_desc(i)->handler != &no_irq_type)
    + register_irq_proc(i);
    +}
    +
    +#endif /* HAVE_ARCH_IRQ_PROC */
    diff --minimal -urN -X /usr/share/dontdiff linux-2.5.72.vanilla/kernel/Makefile linux-2.5.72/kernel/Makefile
    --- linux-2.5.72.vanilla/kernel/Makefile 2003-06-17 20:00:48.000000000 +0400
    +++ linux-2.5.72/kernel/Makefile 2003-06-17 22:26:07.000000000 +0400
    @@ -19,6 +19,7 @@
    obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o
    obj-$(CONFIG_SOFTWARE_SUSPEND) += suspend.o
    obj-$(CONFIG_COMPAT) += compat.o
    +obj-$(CONFIG_GENERIC_IRQ) += irq.o

    ifneq ($(CONFIG_IA64),y)
    # According to Alan Modra <alan@linuxcare.com.au>, the -fno-omit-frame-pointer is[unhandled content-type:application/pgp-signature]
    \
     
     \ /
      Last update: 2005-03-22 13:36    [W:5.414 / U:0.012 seconds]
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