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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] Remove unused teardown_irq() definition. Removes two files from sparse tree.
# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 588c548b6a33570fce749567135027abcd41338c
# Parent a1e562ceaf15da0a2ce284dff827c8bebf508fc1
Remove unused teardown_irq() definition. Removes two files from sparse tree.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
diff -r a1e562ceaf15 -r 588c548b6a33 linux-2.6-xen-sparse/include/linux/irq.h
--- a/linux-2.6-xen-sparse/include/linux/irq.h Wed Apr 5 14:42:41 2006
+++ /dev/null Thu Apr 6 08:28:45 2006
@@ -1,244 +0,0 @@
-#ifndef __irq_h
-#define __irq_h
-
-/*
- * Please do not include this file in generic code. There is currently
- * no requirement for any architecture to implement anything held
- * within this file.
- *
- * Thanks. --rmk
- */
-
-#include <linux/config.h>
-#include <linux/smp.h>
-
-#if !defined(CONFIG_S390)
-
-#include <linux/linkage.h>
-#include <linux/cache.h>
-#include <linux/spinlock.h>
-#include <linux/cpumask.h>
-
-#include <asm/irq.h>
-#include <asm/ptrace.h>
-
-/*
- * IRQ line status.
- */
-#define IRQ_INPROGRESS 1 /* IRQ handler active - do not enter! */
-#define IRQ_DISABLED 2 /* IRQ disabled - do not enter! */
-#define IRQ_PENDING 4 /* IRQ pending - replay on enable */
-#define IRQ_REPLAY 8 /* IRQ has been replayed but not acked yet */
-#define IRQ_AUTODETECT 16 /* IRQ is being autodetected */
-#define IRQ_WAITING 32 /* IRQ not yet seen - for autodetection */
-#define IRQ_LEVEL 64 /* IRQ level triggered */
-#define IRQ_MASKED 128 /* IRQ masked - shouldn't be seen again */
-#if defined(ARCH_HAS_IRQ_PER_CPU)
-# define IRQ_PER_CPU 256 /* IRQ is per CPU */
-# define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
-#else
-# define CHECK_IRQ_PER_CPU(var) 0
-#endif
-
-/*
- * Interrupt controller descriptor. This is all we need
- * to describe about the low-level hardware.
- */
-struct hw_interrupt_type {
- const char * typename;
- unsigned int (*startup)(unsigned int irq);
- void (*shutdown)(unsigned int irq);
- void (*enable)(unsigned int irq);
- void (*disable)(unsigned int irq);
- void (*ack)(unsigned int irq);
- void (*end)(unsigned int irq);
- void (*set_affinity)(unsigned int irq, cpumask_t dest);
- /* Currently used only by UML, might disappear one day.*/
-#ifdef CONFIG_IRQ_RELEASE_METHOD
- void (*release)(unsigned int irq, void *dev_id);
-#endif
-};
-
-typedef struct hw_interrupt_type hw_irq_controller;
-
-/*
- * This is the "IRQ descriptor", which contains various information
- * about the irq, including what kind of hardware handling it has,
- * whether it is disabled etc etc.
- *
- * Pad this out to 32 bytes for cache and indexing reasons.
- */
-typedef struct irq_desc {
- hw_irq_controller *handler;
- void *handler_data;
- struct irqaction *action; /* IRQ action list */
- unsigned int status; /* IRQ status */
- unsigned int depth; /* nested irq disables */
- unsigned int irq_count; /* For detecting broken interrupts */
- unsigned int irqs_unhandled;
- spinlock_t lock;
-#if defined (CONFIG_GENERIC_PENDING_IRQ) || defined (CONFIG_IRQBALANCE)
- unsigned int move_irq; /* Flag need to re-target intr dest*/
-#endif
-} ____cacheline_aligned irq_desc_t;
-
-extern irq_desc_t irq_desc [NR_IRQS];
-
-/* Return a pointer to the irq descriptor for IRQ. */
-static inline irq_desc_t *
-irq_descp (int irq)
-{
- return irq_desc + irq;
-}
-
-#include <asm/hw_irq.h> /* the arch dependent stuff */
-
-extern int setup_irq(unsigned int irq, struct irqaction * new);
-#ifdef CONFIG_XEN
-extern int teardown_irq(unsigned int irq, struct irqaction * old);
-#endif
-
-#ifdef CONFIG_GENERIC_HARDIRQS
-extern cpumask_t irq_affinity[NR_IRQS];
-
-#ifdef CONFIG_SMP
-static inline void set_native_irq_info(int irq, cpumask_t mask)
-{
- irq_affinity[irq] = mask;
-}
-#else
-static inline void set_native_irq_info(int irq, cpumask_t mask)
-{
-}
-#endif
-
-#ifdef CONFIG_SMP
-
-#if defined (CONFIG_GENERIC_PENDING_IRQ) || defined (CONFIG_IRQBALANCE)
-extern cpumask_t pending_irq_cpumask[NR_IRQS];
-
-static inline void set_pending_irq(unsigned int irq, cpumask_t mask)
-{
- irq_desc_t *desc = irq_desc + irq;
- unsigned long flags;
-
- spin_lock_irqsave(&desc->lock, flags);
- desc->move_irq = 1;
- pending_irq_cpumask[irq] = mask;
- spin_unlock_irqrestore(&desc->lock, flags);
-}
-
-static inline void
-move_native_irq(int irq)
-{
- cpumask_t tmp;
- irq_desc_t *desc = irq_descp(irq);
-
- if (likely (!desc->move_irq))
- return;
-
- desc->move_irq = 0;
-
- if (likely(cpus_empty(pending_irq_cpumask[irq])))
- return;
-
- if (!desc->handler->set_affinity)
- return;
-
- /* note - we hold the desc->lock */
- cpus_and(tmp, pending_irq_cpumask[irq], cpu_online_map);
-
- /*
- * If there was a valid mask to work with, please
- * do the disable, re-program, enable sequence.
- * This is *not* particularly important for level triggered
- * but in a edge trigger case, we might be setting rte
- * when an active trigger is comming in. This could
- * cause some ioapics to mal-function.
- * Being paranoid i guess!
- */
- if (unlikely(!cpus_empty(tmp))) {
- desc->handler->disable(irq);
- desc->handler->set_affinity(irq,tmp);
- desc->handler->enable(irq);
- }
- cpus_clear(pending_irq_cpumask[irq]);
-}
-
-#ifdef CONFIG_PCI_MSI
-/*
- * Wonder why these are dummies?
- * For e.g the set_ioapic_affinity_vector() calls the set_ioapic_affinity_irq()
- * counter part after translating the vector to irq info. We need to perform
- * this operation on the real irq, when we dont use vector, i.e when
- * pci_use_vector() is false.
- */
-static inline void move_irq(int irq)
-{
-}
-
-static inline void set_irq_info(int irq, cpumask_t mask)
-{
-}
-
-#else // CONFIG_PCI_MSI
-
-static inline void move_irq(int irq)
-{
- move_native_irq(irq);
-}
-
-static inline void set_irq_info(int irq, cpumask_t mask)
-{
- set_native_irq_info(irq, mask);
-}
-#endif // CONFIG_PCI_MSI
-
-#else // CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE
-
-#define move_irq(x)
-#define move_native_irq(x)
-#define set_pending_irq(x,y)
-static inline void set_irq_info(int irq, cpumask_t mask)
-{
- set_native_irq_info(irq, mask);
-}
-
-#endif // CONFIG_GENERIC_PENDING_IRQ
-
-#else // CONFIG_SMP
-
-#define move_irq(x)
-#define move_native_irq(x)
-
-#endif // CONFIG_SMP
-
-extern int no_irq_affinity;
-extern int noirqdebug_setup(char *str);
-
-extern fastcall int handle_IRQ_event(unsigned int irq, struct pt_regs *regs,
- struct irqaction *action);
-extern fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs);
-extern void note_interrupt(unsigned int irq, irq_desc_t *desc,
- int action_ret, struct pt_regs *regs);
-extern int can_request_irq(unsigned int irq, unsigned long irqflags);
-
-extern void init_irq_proc(void);
-
-#ifdef CONFIG_AUTO_IRQ_AFFINITY
-extern int select_smp_affinity(unsigned int irq);
-#else
-static inline int
-select_smp_affinity(unsigned int irq)
-{
- return 1;
-}
-#endif
-
-#endif
-
-extern hw_irq_controller no_irq_type; /* needed in every arch ? */
-
-#endif
-
-#endif /* __irq_h */
diff -r a1e562ceaf15 -r 588c548b6a33 linux-2.6-xen-sparse/kernel/irq/manage.c
--- a/linux-2.6-xen-sparse/kernel/irq/manage.c Wed Apr 5 14:42:41 2006
+++ /dev/null Thu Apr 6 08:28:45 2006
@@ -1,425 +0,0 @@
-/*
- * 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/config.h>
-#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 };
-
-#if defined (CONFIG_GENERIC_PENDING_IRQ) || defined (CONFIG_IRQBALANCE)
-cpumask_t __cacheline_aligned pending_irq_cpumask[NR_IRQS];
-#endif
-
-/**
- * synchronize_irq - wait for pending IRQ handlers (on other CPUs)
- * @irq: interrupt number to wait for
- *
- * 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;
-
- if (irq >= NR_IRQS)
- return;
-
- 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;
-
- if (irq >= NR_IRQS)
- return;
-
- 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;
-
- if (irq >= NR_IRQS)
- return;
-
- 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;
-
- if (irq >= NR_IRQS)
- return;
-
- 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;
-}
-
-/**
- * setup_irq - register an irqaction structure
- * @irq: Interrupt to register
- * @irqaction: The irqaction structure to be registered
- *
- * Normally called by request_irq, this function can be used
- * directly 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 (irq >= NR_IRQS)
- return -EINVAL;
-
- 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;
-}
-
-/*
- * teardown_irq - unregister an irqaction
- * @irq: Interrupt line being freed
- * @old: Pointer to the irqaction that is to be unregistered
- *
- * This function is called by free_irq and does the actual
- * business of unregistering the handler. It exists as a
- * seperate function to enable handlers to be unregistered
- * for irqactions that have been allocated statically at
- * boot time.
- *
- * This function must not be called from interrupt context.
- */
-#ifndef CONFIG_XEN
-static
-#endif
-int teardown_irq(unsigned int irq, struct irqaction * old)
-{
- struct irq_desc *desc;
- struct irqaction **p;
- unsigned long flags;
-
- if (irq >= NR_IRQS)
- return -ENOENT;
-
- 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 != old)
- continue;
-
- /* Found it - now remove it from the list of entries */
- *pp = action->next;
-
- /* Currently used only by UML, might disappear one
day.*/
-#ifdef CONFIG_IRQ_RELEASE_METHOD
- if (desc->handler->release)
- desc->handler->release(irq, dev_id);
-#endif
-
- 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);
- return 0;
- }
- printk(KERN_ERR "Trying to teardown free IRQ%d\n",irq);
- spin_unlock_irqrestore(&desc->lock,flags);
- return -ENOENT;
- }
-}
-
-/**
- * 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 *action;
- unsigned long flags;
-
- if (irq >= NR_IRQS)
- return;
-
- desc = irq_desc + irq;
- spin_lock_irqsave(&desc->lock,flags);
- for (action = desc->action; action != NULL; action = action->next) {
- if (action->dev_id != dev_id)
- continue;
-
- spin_unlock_irqrestore(&desc->lock,flags);
-
- if (teardown_irq(irq, action) == 0)
- 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;
-
- select_smp_affinity(irq);
-
- retval = setup_irq(irq, action);
- if (retval)
- kfree(action);
-
- return retval;
-}
-
-EXPORT_SYMBOL(request_irq);
-
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