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genirq: Remove the now unused sparse irq leftovers

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The move_irq_desc() function was only used due to the problem that the
allocator did not free the old descriptors. So the descriptors had to
be moved in create_irq_nr(). That's history.

The code would have never been able to move active interrupt
descriptors on affinity settings. That can be done in a completely
different way w/o all this horror.

Remove all of it.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Thomas Gleixner 2010-09-29 17:18:47 +02:00
parent b7b29338dc
commit 78f90d91f3
6 changed files with 4 additions and 266 deletions
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12
include/linux/irqdesc.h
View File

@ -82,24 +82,16 @@ struct irq_desc {
const char *name;
} ____cacheline_internodealigned_in_smp;
extern void arch_init_copy_chip_data(struct irq_desc *old_desc,
struct irq_desc *desc, int node);
extern void arch_free_chip_data(struct irq_desc *old_desc, struct irq_desc *desc);
#ifndef CONFIG_SPARSE_IRQ
extern struct irq_desc irq_desc[NR_IRQS];
#endif
#ifdef CONFIG_NUMA_IRQ_DESC
extern struct irq_desc *move_irq_desc(struct irq_desc *old_desc, int node);
#else
/* Will be removed once the last users in power and sh are gone */
extern struct irq_desc *irq_to_desc_alloc_node(unsigned int irq, int node);
static inline struct irq_desc *move_irq_desc(struct irq_desc *desc, int node)
{
return desc;
}
#endif
extern struct irq_desc *irq_to_desc_alloc_node(unsigned int irq, int node);
#ifdef CONFIG_GENERIC_HARDIRQS

5
kernel/irq/Kconfig
View File

@ -26,11 +26,6 @@ config GENERIC_IRQ_PROBE
config GENERIC_PENDING_IRQ
def_bool n
if SPARSE_IRQ && NUMA
config NUMA_IRQ_DESC
def_bool n
endif
config AUTO_IRQ_AFFINITY
def_bool n

1
kernel/irq/Makefile
View File

@ -3,5 +3,4 @@ obj-y := irqdesc.o handle.o manage.o spurious.o resend.o chip.o dummychip.o devr
obj-$(CONFIG_GENERIC_IRQ_PROBE) += autoprobe.o
obj-$(CONFIG_PROC_FS) += proc.o
obj-$(CONFIG_GENERIC_PENDING_IRQ) += migration.o
obj-$(CONFIG_NUMA_IRQ_DESC) += numa_migrate.o
obj-$(CONFIG_PM_SLEEP) += pm.o

102
kernel/irq/internals.h
View File

@ -18,17 +18,11 @@ extern int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
extern void __disable_irq(struct irq_desc *desc, unsigned int irq, bool susp);
extern void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume);
extern struct lock_class_key irq_desc_lock_class;
extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
extern raw_spinlock_t sparse_irq_lock;
/* Resending of interrupts :*/
void check_irq_resend(struct irq_desc *desc, unsigned int irq);
#ifdef CONFIG_SPARSE_IRQ
void replace_irq_desc(unsigned int irq, struct irq_desc *desc);
#endif
#ifdef CONFIG_PROC_FS
extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
@ -110,99 +104,3 @@ static inline void print_irq_desc(unsigned int irq, struct irq_desc *desc)
#undef P
/* Stuff below will be cleaned up after the sparse allocator is done */
#ifdef CONFIG_SMP
/**
* alloc_desc_masks - allocate cpumasks for irq_desc
* @desc: pointer to irq_desc struct
* @node: node which will be handling the cpumasks
* @boot: true if need bootmem
*
* Allocates affinity and pending_mask cpumask if required.
* Returns true if successful (or not required).
*/
static inline bool alloc_desc_masks(struct irq_desc *desc, int node,
bool boot)
{
gfp_t gfp = GFP_ATOMIC;
if (boot)
gfp = GFP_NOWAIT;
#ifdef CONFIG_CPUMASK_OFFSTACK
if (!alloc_cpumask_var_node(&desc->irq_data.affinity, gfp, node))
return false;
#ifdef CONFIG_GENERIC_PENDING_IRQ
if (!alloc_cpumask_var_node(&desc->pending_mask, gfp, node)) {
free_cpumask_var(desc->irq_data.affinity);
return false;
}
#endif
#endif
return true;
}
static inline void init_desc_masks(struct irq_desc *desc)
{
cpumask_setall(desc->irq_data.affinity);
#ifdef CONFIG_GENERIC_PENDING_IRQ
cpumask_clear(desc->pending_mask);
#endif
}
/**
* init_copy_desc_masks - copy cpumasks for irq_desc
* @old_desc: pointer to old irq_desc struct
* @new_desc: pointer to new irq_desc struct
*
* Insures affinity and pending_masks are copied to new irq_desc.
* If !CONFIG_CPUMASKS_OFFSTACK the cpumasks are embedded in the
* irq_desc struct so the copy is redundant.
*/
static inline void init_copy_desc_masks(struct irq_desc *old_desc,
struct irq_desc *new_desc)
{
#ifdef CONFIG_CPUMASK_OFFSTACK
cpumask_copy(new_desc->irq_data.affinity, old_desc->irq_data.affinity);
#ifdef CONFIG_GENERIC_PENDING_IRQ
cpumask_copy(new_desc->pending_mask, old_desc->pending_mask);
#endif
#endif
}
static inline void free_desc_masks(struct irq_desc *old_desc,
struct irq_desc *new_desc)
{
free_cpumask_var(old_desc->irq_data.affinity);
#ifdef CONFIG_GENERIC_PENDING_IRQ
free_cpumask_var(old_desc->pending_mask);
#endif
}
#else /* !CONFIG_SMP */
static inline bool alloc_desc_masks(struct irq_desc *desc, int node,
bool boot)
{
return true;
}
static inline void init_desc_masks(struct irq_desc *desc)
{
}
static inline void init_copy_desc_masks(struct irq_desc *old_desc,
struct irq_desc *new_desc)
{
}
static inline void free_desc_masks(struct irq_desc *old_desc,
struct irq_desc *new_desc)
{
}
#endif /* CONFIG_SMP */

30
kernel/irq/irqdesc.c
View File

@ -20,7 +20,7 @@
/*
* lockdep: we want to handle all irq_desc locks as a single lock-class:
*/
struct lock_class_key irq_desc_lock_class;
static struct lock_class_key irq_desc_lock_class;
#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)
static void __init init_irq_default_affinity(void)
@ -90,28 +90,11 @@ static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node)
int nr_irqs = NR_IRQS;
EXPORT_SYMBOL_GPL(nr_irqs);
DEFINE_RAW_SPINLOCK(sparse_irq_lock);
static DEFINE_RAW_SPINLOCK(sparse_irq_lock);
static DECLARE_BITMAP(allocated_irqs, NR_IRQS);
#ifdef CONFIG_SPARSE_IRQ
void __ref init_kstat_irqs(struct irq_desc *desc, int node, int nr)
{
void *ptr;
ptr = kzalloc_node(nr * sizeof(*desc->kstat_irqs),
GFP_ATOMIC, node);
/*
* don't overwite if can not get new one
* init_copy_kstat_irqs() could still use old one
*/
if (ptr) {
printk(KERN_DEBUG " alloc kstat_irqs on node %d\n", node);
desc->kstat_irqs = ptr;
}
}
static RADIX_TREE(irq_desc_tree, GFP_ATOMIC);
static void irq_insert_desc(unsigned int irq, struct irq_desc *desc)
@ -124,15 +107,6 @@ struct irq_desc *irq_to_desc(unsigned int irq)
return radix_tree_lookup(&irq_desc_tree, irq);
}
void replace_irq_desc(unsigned int irq, struct irq_desc *desc)
{
void **ptr;
ptr = radix_tree_lookup_slot(&irq_desc_tree, irq);
if (ptr)
radix_tree_replace_slot(ptr, desc);
}
static void delete_irq_desc(unsigned int irq)
{
radix_tree_delete(&irq_desc_tree, irq);

120
kernel/irq/numa_migrate.c
View File

@ -1,120 +0,0 @@
/*
* NUMA irq-desc migration code
*
* Migrate IRQ data structures (irq_desc, chip_data, etc.) over to
* the new "home node" of the IRQ.
*/
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/random.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include "internals.h"
static void init_copy_kstat_irqs(struct irq_desc *old_desc,
struct irq_desc *desc,
int node, int nr)
{
init_kstat_irqs(desc, node, nr);
if (desc->kstat_irqs != old_desc->kstat_irqs)
memcpy(desc->kstat_irqs, old_desc->kstat_irqs,
nr * sizeof(*desc->kstat_irqs));
}
static void free_kstat_irqs(struct irq_desc *old_desc, struct irq_desc *desc)
{
if (old_desc->kstat_irqs == desc->kstat_irqs)
return;
kfree(old_desc->kstat_irqs);
old_desc->kstat_irqs = NULL;
}
static bool init_copy_one_irq_desc(int irq, struct irq_desc *old_desc,
struct irq_desc *desc, int node)
{
memcpy(desc, old_desc, sizeof(struct irq_desc));
if (!alloc_desc_masks(desc, node, false)) {
printk(KERN_ERR "irq %d: can not get new irq_desc cpumask "
"for migration.\n", irq);
return false;
}
raw_spin_lock_init(&desc->lock);
desc->irq_data.node = node;
lockdep_set_class(&desc->lock, &irq_desc_lock_class);
init_copy_kstat_irqs(old_desc, desc, node, nr_cpu_ids);
init_copy_desc_masks(old_desc, desc);
arch_init_copy_chip_data(old_desc, desc, node);
return true;
}
static void free_one_irq_desc(struct irq_desc *old_desc, struct irq_desc *desc)
{
free_kstat_irqs(old_desc, desc);
free_desc_masks(old_desc, desc);
arch_free_chip_data(old_desc, desc);
}
static struct irq_desc *__real_move_irq_desc(struct irq_desc *old_desc,
int node)
{
struct irq_desc *desc;
unsigned int irq;
unsigned long flags;
irq = old_desc->irq_data.irq;
raw_spin_lock_irqsave(&sparse_irq_lock, flags);
/* We have to check it to avoid races with another CPU */
desc = irq_to_desc(irq);
if (desc && old_desc != desc)
goto out_unlock;
desc = kzalloc_node(sizeof(*desc), GFP_ATOMIC, node);
if (!desc) {
printk(KERN_ERR "irq %d: can not get new irq_desc "
"for migration.\n", irq);
/* still use old one */
desc = old_desc;
goto out_unlock;
}
if (!init_copy_one_irq_desc(irq, old_desc, desc, node)) {
/* still use old one */
kfree(desc);
desc = old_desc;
goto out_unlock;
}
replace_irq_desc(irq, desc);
raw_spin_unlock_irqrestore(&sparse_irq_lock, flags);
/* free the old one */
free_one_irq_desc(old_desc, desc);
kfree(old_desc);
return desc;
out_unlock:
raw_spin_unlock_irqrestore(&sparse_irq_lock, flags);
return desc;
}
struct irq_desc *move_irq_desc(struct irq_desc *desc, int node)
{
/* those static or target node is -1, do not move them */
if (desc->irq_data.irq < NR_IRQS_LEGACY || node == -1)
return desc;
if (desc->irq_data.node != node)
desc = __real_move_irq_desc(desc, node);
return desc;
}