genirq: remove sparse irq code

This code is not ready, but we need to rip it out instead of rebasing
as we would lose the APIC/IO_APIC unification otherwise.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

3 files changed, 4 insertions, 142 deletions

diff --git a/arch/x86/kernel/io_apic.c b/arch/x86/kernel/io_apic.c
index f959acbc0db2..683610517d2a 100644
--- a/arch/x86/kernel/io_apic.c
+++ b/arch/x86/kernel/io_apic.c
@@ -111,9 +111,6 @@ struct irq_cfg;
 struct irq_pin_list;
 struct irq_cfg {
         unsigned int irq;
-#ifdef CONFIG_HAVE_SPARSE_IRQ
-        struct irq_cfg *next;
-#endif
         struct irq_pin_list *irq_2_pin;
         cpumask_t domain;
         cpumask_t old_domain;
@@ -151,15 +148,6 @@ static void init_one_irq_cfg(struct irq_cfg *cfg)
 
 static struct irq_cfg *irq_cfgx;
 
-#ifdef CONFIG_HAVE_SPARSE_IRQ
-/*
- * Protect the irq_cfgx_free freelist:
- */
-static DEFINE_SPINLOCK(irq_cfg_lock);
-
-static struct irq_cfg *irq_cfgx_free;
-#endif
-
 static void __init init_work(void *data)
 {
         struct dyn_array *da = data;
@@ -174,114 +162,7 @@ static void __init init_work(void *data)
         legacy_count = ARRAY_SIZE(irq_cfg_legacy);
         for (i = legacy_count; i < *da->nr; i++)
                 init_one_irq_cfg(&cfg[i]);
-
-#ifdef CONFIG_HAVE_SPARSE_IRQ
-        for (i = 1; i < *da->nr; i++)
-                cfg[i-1].next = &cfg[i];
-
-        irq_cfgx_free = &irq_cfgx[legacy_count];
-        irq_cfgx[legacy_count - 1].next = NULL;
-#endif
-}
-
-#ifdef CONFIG_HAVE_SPARSE_IRQ
-/* need to be biger than size of irq_cfg_legacy */
-static int nr_irq_cfg = 32;
-
-static int __init parse_nr_irq_cfg(char *arg)
-{
-        if (arg) {
-                nr_irq_cfg = simple_strtoul(arg, NULL, 0);
-                if (nr_irq_cfg < 32)
-                        nr_irq_cfg = 32;
-        }
-        return 0;
-}
-
-early_param("nr_irq_cfg", parse_nr_irq_cfg);
-
-#define for_each_irq_cfg(irqX, cfg)           \
-        for (cfg = irq_cfgx, irqX = cfg->irq; cfg; cfg = cfg->next, irqX = cfg ? cfg->irq : -1U)
-
-
-DEFINE_DYN_ARRAY(irq_cfgx, sizeof(struct irq_cfg), nr_irq_cfg, PAGE_SIZE, init_work);
-
-static struct irq_cfg *irq_cfg(unsigned int irq)
-{
-        struct irq_cfg *cfg;
-
-        cfg = irq_cfgx;
-        while (cfg) {
-                if (cfg->irq == irq)
-                        return cfg;
-
-                cfg = cfg->next;
-        }
-
-        return NULL;
-}
-
-static struct irq_cfg *irq_cfg_alloc(unsigned int irq)
-{
-        struct irq_cfg *cfg, *cfg_pri;
-        unsigned long flags;
-        int count = 0;
-        int i;
-
-        cfg_pri = cfg = irq_cfgx;
-        while (cfg) {
-                if (cfg->irq == irq)
-                        return cfg;
-
-                cfg_pri = cfg;
-                cfg = cfg->next;
-                count++;
-        }
-
-        spin_lock_irqsave(&irq_cfg_lock, flags);
-        if (!irq_cfgx_free) {
-                unsigned long phys;
-                unsigned long total_bytes;
-                /*
-                 *  we run out of pre-allocate ones, allocate more
-                 */
-                printk(KERN_DEBUG "try to get more irq_cfg %d\n", nr_irq_cfg);
-
-                total_bytes = sizeof(struct irq_cfg) * nr_irq_cfg;
-                if (after_bootmem)
-                        cfg = kzalloc(total_bytes, GFP_ATOMIC);
-                else
-                        cfg = __alloc_bootmem_nopanic(total_bytes, PAGE_SIZE, 0);
-
-                if (!cfg)
-                        panic("please boot with nr_irq_cfg= %d\n", count * 2);
-
-                phys = __pa(cfg);
-                printk(KERN_DEBUG "irq_cfg ==> [%#lx - %#lx]\n", phys, phys + total_bytes);
-
-                for (i = 0; i < nr_irq_cfg; i++)
-                        init_one_irq_cfg(&cfg[i]);
-
-                for (i = 1; i < nr_irq_cfg; i++)
-                        cfg[i-1].next = &cfg[i];
-
-                irq_cfgx_free = cfg;
-        }
-
-        cfg = irq_cfgx_free;
-        irq_cfgx_free = irq_cfgx_free->next;
-        cfg->next = NULL;
-        if (cfg_pri)
-                cfg_pri->next = cfg;
-        else
-                irq_cfgx = cfg;
-        cfg->irq = irq;
-
-        spin_unlock_irqrestore(&irq_cfg_lock, flags);
-
-        return cfg;
 }
-#else
 
 #define for_each_irq_cfg(irq, cfg)              \
         for (irq = 0, cfg = &irq_cfgx[irq]; irq < nr_irqs; irq++, cfg = &irq_cfgx[irq])
@@ -290,17 +171,16 @@ DEFINE_DYN_ARRAY(irq_cfgx, sizeof(struct irq_cfg), nr_irqs, PAGE_SIZE, init_work
 
 struct irq_cfg *irq_cfg(unsigned int irq)
 {
-        if (irq < nr_irqs)
-                return &irq_cfgx[irq];
+        if (irq < nr_irqs)
+                return &irq_cfgx[irq];
 
-        return NULL;
+        return NULL;
 }
 struct irq_cfg *irq_cfg_alloc(unsigned int irq)
 {
-        return irq_cfg(irq);
+        return irq_cfg(irq);
 }
 
-#endif
 /*
  * This is performance-critical, we want to do it O(1)
  *
@@ -3068,9 +2948,7 @@ unsigned int create_irq_nr(unsigned int irq_want)
         unsigned long flags;
         struct irq_cfg *cfg_new;
 
-#ifndef CONFIG_HAVE_SPARSE_IRQ
         irq_want = nr_irqs - 1;
-#endif
 
         irq = 0;
         spin_lock_irqsave(&vector_lock, flags);
diff --git a/arch/x86/kernel/irq_32.c b/arch/x86/kernel/irq_32.c
index 001772ffc918..ccf6c1bf7120 100644
--- a/arch/x86/kernel/irq_32.c
+++ b/arch/x86/kernel/irq_32.c
@@ -272,20 +272,12 @@ int show_interrupts(struct seq_file *p, void *v)
         struct irq_desc *desc = NULL;
         int tail = 0;
 
-#ifdef CONFIG_HAVE_SPARSE_IRQ
-        desc = (struct irq_desc *)v;
-        entries = -1U;
-        i = desc->irq;
-        if (!desc->next)
-                tail = 1;
-#else
         entries = nr_irqs - 1;
         i = *(loff_t *) v;
         if (i == nr_irqs)
                 tail = 1;
         else
                 desc = irq_to_desc(i);
-#endif
 
         if (i == 0) {
                 seq_printf(p, "           ");
diff --git a/arch/x86/kernel/irq_64.c b/arch/x86/kernel/irq_64.c
index ec2661091283..21f53b911113 100644
--- a/arch/x86/kernel/irq_64.c
+++ b/arch/x86/kernel/irq_64.c
@@ -77,20 +77,12 @@ int show_interrupts(struct seq_file *p, void *v)
         struct irq_desc *desc = NULL;
         int tail = 0;
 
-#ifdef CONFIG_HAVE_SPARSE_IRQ
-        desc = (struct irq_desc *)v;
-        entries = -1U;
-        i = desc->irq;
-        if (!desc->next)
-                tail = 1;
-#else
         entries = nr_irqs - 1;
         i = *(loff_t *) v;
         if (i == nr_irqs)
                 tail = 1;
         else
                 desc = irq_to_desc(i);
-#endif
 
         if (i == 0) {
                 seq_printf(p, "           ");