genirq: Remove the now unused sparse irq leftovers

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>

1 files changed, 0 insertions, 120 deletions

diff --git a/kernel/irq/numa_migrate.c b/kernel/irq/numa_migrate.c
deleted file mode 100644
index e7f1f16402c1..000000000000
--- a/kernel/irq/numa_migrate.c
+++ /dev/null
@@ -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;
-}
-