genirq: revert dynarray

Revert the dynarray changes. They need more thought and polishing.

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

19 files changed, 103 insertions, 496 deletions

diff --git a/arch/Kconfig b/arch/Kconfig
index c8a7c2eb649..071004d3a1b 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -102,7 +102,3 @@ config HAVE_CLK
 	help
 	  The <linux/clk.h> calls support software clock gating and
 	  thus are a key power management tool on many systems.
-
-config HAVE_DYN_ARRAY
-	def_bool n
-
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 8636ddf2f4a..8da6123a60d 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -33,7 +33,6 @@ config X86
 	select HAVE_ARCH_TRACEHOOK
 	select HAVE_GENERIC_DMA_COHERENT if X86_32
 	select HAVE_EFFICIENT_UNALIGNED_ACCESS
-	select HAVE_DYN_ARRAY
 
 config ARCH_DEFCONFIG
 	string
diff --git a/arch/x86/kernel/io_apic.c b/arch/x86/kernel/io_apic.c
index e03bc0f87ee..6f80dc2f137 100644
--- a/arch/x86/kernel/io_apic.c
+++ b/arch/x86/kernel/io_apic.c
@@ -107,7 +107,6 @@ static int __init parse_noapic(char *str)
 }
 early_param("noapic", parse_noapic);
 
-struct irq_cfg;
 struct irq_pin_list;
 struct irq_cfg {
 	unsigned int irq;
@@ -120,7 +119,7 @@ struct irq_cfg {
 };
 
 /* irq_cfg is indexed by the sum of all RTEs in all I/O APICs. */
-static struct irq_cfg irq_cfg_legacy[] __initdata = {
+static struct irq_cfg irq_cfgx[NR_IRQS] = {
 	[0]  = { .irq =  0, .domain = CPU_MASK_ALL, .vector = IRQ0_VECTOR,  },
 	[1]  = { .irq =  1, .domain = CPU_MASK_ALL, .vector = IRQ1_VECTOR,  },
 	[2]  = { .irq =  2, .domain = CPU_MASK_ALL, .vector = IRQ2_VECTOR,  },
@@ -139,49 +138,27 @@ static struct irq_cfg irq_cfg_legacy[] __initdata = {
 	[15] = { .irq = 15, .domain = CPU_MASK_ALL, .vector = IRQ15_VECTOR, },
 };
 
-static struct irq_cfg irq_cfg_init = { .irq =  -1U, };
-
-static void init_one_irq_cfg(struct irq_cfg *cfg)
-{
-	memcpy(cfg, &irq_cfg_init, sizeof(struct irq_cfg));
-}
-
-static struct irq_cfg *irq_cfgx;
-
-static void __init init_work(void *data)
-{
-	struct dyn_array *da = data;
-	struct irq_cfg *cfg;
-	int legacy_count;
-	int i;
-
-	cfg = *da->name;
-
-	memcpy(cfg, irq_cfg_legacy, sizeof(irq_cfg_legacy));
-
-	legacy_count = ARRAY_SIZE(irq_cfg_legacy);
-	for (i = legacy_count; i < *da->nr; i++)
-		init_one_irq_cfg(&cfg[i]);
-}
-
 #define for_each_irq_cfg(irq, cfg)		\
-	for (irq = 0, cfg = &irq_cfgx[irq]; irq < nr_irqs; irq++, cfg = &irq_cfgx[irq])
+	for (irq = 0, cfg = irq_cfgx; irq < nr_irqs; irq++, cfg++)
 
-DEFINE_DYN_ARRAY(irq_cfgx, sizeof(struct irq_cfg), nr_irqs, PAGE_SIZE, init_work);
-
-struct irq_cfg *irq_cfg(unsigned int irq)
+static struct irq_cfg *irq_cfg(unsigned int irq)
 {
-	if (irq < nr_irqs)
-		return &irq_cfgx[irq];
-
-	return NULL;
+	return irq < nr_irqs ? irq_cfgx + irq : NULL;
 }
-struct irq_cfg *irq_cfg_alloc(unsigned int irq)
+
+static struct irq_cfg *irq_cfg_alloc(unsigned int irq)
 {
 	return irq_cfg(irq);
 }
 
 /*
+ * Rough estimation of how many shared IRQs there are, can be changed
+ * anytime.
+ */
+#define MAX_PLUS_SHARED_IRQS NR_IRQS
+#define PIN_MAP_SIZE (MAX_PLUS_SHARED_IRQS + NR_IRQS)
+
+/*
  * This is performance-critical, we want to do it O(1)
  *
  * the indexing order of this array favors 1:1 mappings
@@ -193,59 +170,29 @@ struct irq_pin_list {
 	struct irq_pin_list *next;
 };
 
-static struct irq_pin_list *irq_2_pin_head;
-/* fill one page ? */
-static int nr_irq_2_pin = 0x100;
+static struct irq_pin_list irq_2_pin_head[PIN_MAP_SIZE];
 static struct irq_pin_list *irq_2_pin_ptr;
-static void __init irq_2_pin_init_work(void *data)
+
+static void __init irq_2_pin_init(void)
 {
-	struct dyn_array *da = data;
-	struct irq_pin_list *pin;
+	struct irq_pin_list *pin = irq_2_pin_head;
 	int i;
 
-	pin = *da->name;
-
-	for (i = 1; i < *da->nr; i++)
+	for (i = 1; i < PIN_MAP_SIZE; i++)
 		pin[i-1].next = &pin[i];
 
 	irq_2_pin_ptr = &pin[0];
 }
-DEFINE_DYN_ARRAY(irq_2_pin_head, sizeof(struct irq_pin_list), nr_irq_2_pin, PAGE_SIZE, irq_2_pin_init_work);
 
 static struct irq_pin_list *get_one_free_irq_2_pin(void)
 {
-	struct irq_pin_list *pin;
-	int i;
-
-	pin = irq_2_pin_ptr;
-
-	if (pin) {
-		irq_2_pin_ptr = pin->next;
-		pin->next = NULL;
-		return pin;
-	}
-
-	/*
-	 *  we run out of pre-allocate ones, allocate more
-	 */
-	printk(KERN_DEBUG "try to get more irq_2_pin %d\n", nr_irq_2_pin);
-
-	if (after_bootmem)
-		pin = kzalloc(sizeof(struct irq_pin_list)*nr_irq_2_pin,
-				 GFP_ATOMIC);
-	else
-		pin = __alloc_bootmem_nopanic(sizeof(struct irq_pin_list) *
-				nr_irq_2_pin, PAGE_SIZE, 0);
+	struct irq_pin_list *pin = irq_2_pin_ptr;
 
 	if (!pin)
 		panic("can not get more irq_2_pin\n");
 
-	for (i = 1; i < nr_irq_2_pin; i++)
-		pin[i-1].next = &pin[i];
-
 	irq_2_pin_ptr = pin->next;
 	pin->next = NULL;
-
 	return pin;
 }
 
@@ -284,8 +231,9 @@ static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned i
 static inline void io_apic_modify(unsigned int apic, unsigned int reg, unsigned int value)
 {
 	struct io_apic __iomem *io_apic = io_apic_base(apic);
-        if (sis_apic_bug)
-                writel(reg, &io_apic->index);
+
+	if (sis_apic_bug)
+		writel(reg, &io_apic->index);
 	writel(value, &io_apic->data);
 }
 
@@ -1044,11 +992,11 @@ static int pin_2_irq(int idx, int apic, int pin)
 		while (i < apic)
 			irq += nr_ioapic_registers[i++];
 		irq += pin;
-                /*
+		/*
                  * For MPS mode, so far only needed by ES7000 platform
                  */
-                if (ioapic_renumber_irq)
-                        irq = ioapic_renumber_irq(apic, irq);
+		if (ioapic_renumber_irq)
+			irq = ioapic_renumber_irq(apic, irq);
 	}
 
 #ifdef CONFIG_X86_32
@@ -1232,19 +1180,19 @@ static struct irq_chip ir_ioapic_chip;
 #ifdef CONFIG_X86_32
 static inline int IO_APIC_irq_trigger(int irq)
 {
-        int apic, idx, pin;
+	int apic, idx, pin;
 
-        for (apic = 0; apic < nr_ioapics; apic++) {
-                for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
-                        idx = find_irq_entry(apic, pin, mp_INT);
-                        if ((idx != -1) && (irq == pin_2_irq(idx, apic, pin)))
-                                return irq_trigger(idx);
-                }
-        }
-        /*
+	for (apic = 0; apic < nr_ioapics; apic++) {
+		for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
+			idx = find_irq_entry(apic, pin, mp_INT);
+			if ((idx != -1) && (irq == pin_2_irq(idx, apic, pin)))
+				return irq_trigger(idx);
+		}
+	}
+	/*
          * nonexistent IRQs are edge default
          */
-        return 0;
+	return 0;
 }
 #else
 static inline int IO_APIC_irq_trigger(int irq)
@@ -1509,8 +1457,8 @@ __apicdebuginit(void) print_IO_APIC(void)
 	reg_01.raw = io_apic_read(apic, 1);
 	if (reg_01.bits.version >= 0x10)
 		reg_02.raw = io_apic_read(apic, 2);
-        if (reg_01.bits.version >= 0x20)
-                reg_03.raw = io_apic_read(apic, 3);
+	if (reg_01.bits.version >= 0x20)
+		reg_03.raw = io_apic_read(apic, 3);
 	spin_unlock_irqrestore(&ioapic_lock, flags);
 
 	printk("\n");
@@ -2089,9 +2037,9 @@ static int ioapic_retrigger_irq(unsigned int irq)
 #else
 static int ioapic_retrigger_irq(unsigned int irq)
 {
-        send_IPI_self(irq_cfg(irq)->vector);
+	send_IPI_self(irq_cfg(irq)->vector);
 
-        return 1;
+	return 1;
 }
 #endif
 
@@ -2189,7 +2137,7 @@ static int migrate_irq_remapped_level(int irq)
 
 	if (io_apic_level_ack_pending(irq)) {
 		/*
-	 	 * Interrupt in progress. Migrating irq now will change the
+		 * Interrupt in progress. Migrating irq now will change the
 		 * vector information in the IO-APIC RTE and that will confuse
 		 * the EOI broadcast performed by cpu.
 		 * So, delay the irq migration to the next instance.
@@ -2426,28 +2374,28 @@ static void ack_apic_level(unsigned int irq)
 }
 
 static struct irq_chip ioapic_chip __read_mostly = {
-	.name 		= "IO-APIC",
-	.startup 	= startup_ioapic_irq,
-	.mask	 	= mask_IO_APIC_irq,
-	.unmask	 	= unmask_IO_APIC_irq,
-	.ack 		= ack_apic_edge,
-	.eoi 		= ack_apic_level,
+	.name		= "IO-APIC",
+	.startup	= startup_ioapic_irq,
+	.mask		= mask_IO_APIC_irq,
+	.unmask		= unmask_IO_APIC_irq,
+	.ack		= ack_apic_edge,
+	.eoi		= ack_apic_level,
 #ifdef CONFIG_SMP
-	.set_affinity 	= set_ioapic_affinity_irq,
+	.set_affinity	= set_ioapic_affinity_irq,
 #endif
 	.retrigger	= ioapic_retrigger_irq,
 };
 
 #ifdef CONFIG_INTR_REMAP
 static struct irq_chip ir_ioapic_chip __read_mostly = {
-	.name 		= "IR-IO-APIC",
-	.startup 	= startup_ioapic_irq,
-	.mask	 	= mask_IO_APIC_irq,
-	.unmask	 	= unmask_IO_APIC_irq,
-	.ack 		= ack_x2apic_edge,
-	.eoi 		= ack_x2apic_level,
+	.name		= "IR-IO-APIC",
+	.startup	= startup_ioapic_irq,
+	.mask		= mask_IO_APIC_irq,
+	.unmask		= unmask_IO_APIC_irq,
+	.ack		= ack_x2apic_edge,
+	.eoi		= ack_x2apic_level,
 #ifdef CONFIG_SMP
-	.set_affinity 	= set_ir_ioapic_affinity_irq,
+	.set_affinity	= set_ir_ioapic_affinity_irq,
 #endif
 	.retrigger	= ioapic_retrigger_irq,
 };
@@ -2636,8 +2584,8 @@ static inline void __init check_timer(void)
 
 	local_irq_save(flags);
 
-        ver = apic_read(APIC_LVR);
-        ver = GET_APIC_VERSION(ver);
+	ver = apic_read(APIC_LVR);
+	ver = GET_APIC_VERSION(ver);
 
 	/*
 	 * get/set the timer IRQ vector:
@@ -2822,12 +2770,12 @@ void __init setup_IO_APIC(void)
 	io_apic_irqs = ~PIC_IRQS;
 
 	apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
-        /*
+	/*
          * Set up IO-APIC IRQ routing.
          */
 #ifdef CONFIG_X86_32
-        if (!acpi_ioapic)
-                setup_ioapic_ids_from_mpc();
+	if (!acpi_ioapic)
+		setup_ioapic_ids_from_mpc();
 #endif
 	sync_Arb_IDs();
 	setup_IO_APIC_irqs();
@@ -2842,9 +2790,9 @@ void __init setup_IO_APIC(void)
 
 static int __init io_apic_bug_finalize(void)
 {
-        if (sis_apic_bug == -1)
-                sis_apic_bug = 0;
-        return 0;
+	if (sis_apic_bug == -1)
+		sis_apic_bug = 0;
+	return 0;
 }
 
 late_initcall(io_apic_bug_finalize);
@@ -3199,7 +3147,7 @@ static int msi_alloc_irte(struct pci_dev *dev, int irq, int nvec)
 	if (index < 0) {
 		printk(KERN_ERR
 		       "Unable to allocate %d IRTE for PCI %s\n", nvec,
-		        pci_name(dev));
+		       pci_name(dev));
 		return -ENOSPC;
 	}
 	return index;
@@ -3885,23 +3833,24 @@ static struct resource * __init ioapic_setup_resources(void)
 void __init ioapic_init_mappings(void)
 {
 	unsigned long ioapic_phys, idx = FIX_IO_APIC_BASE_0;
-	int i;
 	struct resource *ioapic_res;
+	int i;
 
+	irq_2_pin_init();
 	ioapic_res = ioapic_setup_resources();
 	for (i = 0; i < nr_ioapics; i++) {
 		if (smp_found_config) {
 			ioapic_phys = mp_ioapics[i].mp_apicaddr;
 #ifdef CONFIG_X86_32
-                        if (!ioapic_phys) {
-                                printk(KERN_ERR
-                                       "WARNING: bogus zero IO-APIC "
-                                       "address found in MPTABLE, "
-                                       "disabling IO/APIC support!\n");
-                                smp_found_config = 0;
-                                skip_ioapic_setup = 1;
-                                goto fake_ioapic_page;
-                        }
+			if (!ioapic_phys) {
+				printk(KERN_ERR
+				       "WARNING: bogus zero IO-APIC "
+				       "address found in MPTABLE, "
+				       "disabling IO/APIC support!\n");
+				smp_found_config = 0;
+				skip_ioapic_setup = 1;
+				goto fake_ioapic_page;
+			}
 #endif
 		} else {
 #ifdef CONFIG_X86_32
diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c
index 2b7dab699e8..410c88f0bfe 100644
--- a/arch/x86/kernel/setup_percpu.c
+++ b/arch/x86/kernel/setup_percpu.c
@@ -140,7 +140,7 @@ static void __init setup_cpu_pda_map(void)
  */
 void __init setup_per_cpu_areas(void)
 {
-	ssize_t size, old_size, da_size;
+	ssize_t size, old_size;
 	char *ptr;
 	int cpu;
 	unsigned long align = 1;
@@ -150,9 +150,8 @@ void __init setup_per_cpu_areas(void)
 
 	/* Copy section for each CPU (we discard the original) */
 	old_size = PERCPU_ENOUGH_ROOM;
-	da_size = per_cpu_dyn_array_size(&align);
 	align = max_t(unsigned long, PAGE_SIZE, align);
-	size = roundup(old_size + da_size, align);
+	size = roundup(old_size, align);
 	printk(KERN_INFO "PERCPU: Allocating %zd bytes of per cpu data\n",
 			  size);
 
@@ -182,9 +181,6 @@ void __init setup_per_cpu_areas(void)
 #endif
 		per_cpu_offset(cpu) = ptr - __per_cpu_start;
 		memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
-
-		per_cpu_alloc_dyn_array(cpu, ptr + old_size);
-
 	}
 
 	printk(KERN_DEBUG "NR_CPUS: %d, nr_cpu_ids: %d, nr_node_ids %d\n",
diff --git a/arch/x86/kernel/visws_quirks.c b/arch/x86/kernel/visws_quirks.c
index 817aa55a120..0c9667f0752 100644
--- a/arch/x86/kernel/visws_quirks.c
+++ b/arch/x86/kernel/visws_quirks.c
@@ -633,7 +633,7 @@ static irqreturn_t piix4_master_intr(int irq, void *dev_id)
 	/*
 	 * handle this 'virtual interrupt' as a Cobalt one now.
 	 */
-	kstat_irqs_this_cpu(desc)++;
+	kstat_incr_irqs_this_cpu(realirq, desc);
 
 	if (likely(desc->action != NULL))
 		handle_IRQ_event(realirq, desc->action);
diff --git a/arch/x86/kernel/vmlinux_32.lds.S b/arch/x86/kernel/vmlinux_32.lds.S
index c36007ab394..a9b8560adbc 100644
--- a/arch/x86/kernel/vmlinux_32.lds.S
+++ b/arch/x86/kernel/vmlinux_32.lds.S
@@ -145,7 +145,6 @@ SECTIONS
 	*(.x86_cpu_dev.init)
 	__x86_cpu_dev_end = .;
   }
-  DYN_ARRAY_INIT(8)
   SECURITY_INIT
   . = ALIGN(4);
   .altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
diff --git a/arch/x86/kernel/vmlinux_64.lds.S b/arch/x86/kernel/vmlinux_64.lds.S
index 30973dbac8c..3245ad72594 100644
--- a/arch/x86/kernel/vmlinux_64.lds.S
+++ b/arch/x86/kernel/vmlinux_64.lds.S
@@ -174,8 +174,6 @@ SECTIONS
   }
   __x86_cpu_dev_end = .;
 
-  DYN_ARRAY_INIT(8)
-
   SECURITY_INIT
 
   . = ALIGN(8);
diff --git a/arch/x86/xen/spinlock.c b/arch/x86/xen/spinlock.c
index bb6bc721b13..5601506f2dd 100644
--- a/arch/x86/xen/spinlock.c
+++ b/arch/x86/xen/spinlock.c
@@ -241,7 +241,7 @@ static noinline int xen_spin_lock_slow(struct raw_spinlock *lock, bool irq_enabl
 		ADD_STATS(taken_slow_spurious, !xen_test_irq_pending(irq));
 	} while (!xen_test_irq_pending(irq)); /* check for spurious wakeups */
 
-	kstat_irqs_this_cpu(irq_to_desc(irq))++;
+	kstat_incr_irqs_this_cpu(irq, irq_to_desc(irq));
 
 out:
 	raw_local_irq_restore(flags);
diff --git a/drivers/char/random.c b/drivers/char/random.c
index 9ce80213007..1137d297604 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -558,12 +558,7 @@ struct timer_rand_state {
 	unsigned dont_count_entropy:1;
 };
 
-#ifdef CONFIG_HAVE_DYN_ARRAY
-static struct timer_rand_state **irq_timer_state;
-DEFINE_DYN_ARRAY(irq_timer_state, sizeof(struct timer_rand_state *), nr_irqs, PAGE_SIZE, NULL);
-#else
 static struct timer_rand_state *irq_timer_state[NR_IRQS];
-#endif
 
 static struct timer_rand_state *get_timer_rand_state(unsigned int irq)
 {
diff --git a/drivers/pci/intr_remapping.c b/drivers/pci/intr_remapping.c
index 0f43b265eee..950769e8747 100644
--- a/drivers/pci/intr_remapping.c
+++ b/drivers/pci/intr_remapping.c
@@ -19,20 +19,13 @@ struct irq_2_iommu {
 	u8  irte_mask;
 };
 
-#ifdef CONFIG_HAVE_DYN_ARRAY
-static struct irq_2_iommu *irq_2_iommuX;
-DEFINE_DYN_ARRAY(irq_2_iommuX, sizeof(struct irq_2_iommu), nr_irqs, PAGE_SIZE, NULL);
-#else
 static struct irq_2_iommu irq_2_iommuX[NR_IRQS];
-#endif
 
 static struct irq_2_iommu *irq_2_iommu(unsigned int irq)
 {
-	if (irq < nr_irqs)
-		return &irq_2_iommuX[irq];
-
-	return NULL;
+	return (irq < nr_irqs) ?: irq_2_iommuX + irq : NULL;
 }
+
 static struct irq_2_iommu *irq_2_iommu_alloc(unsigned int irq)
 {
 	return irq_2_iommu(irq);
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index c68eda9d9a9..7440a0dcedd 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -210,19 +210,6 @@
  * All archs are supposed to use RO_DATA() */
 #define RODATA RO_DATA(4096)
 
-#define DYN_ARRAY_INIT(align)							\
-	. = ALIGN((align));						\
-	.dyn_array.init : AT(ADDR(.dyn_array.init) - LOAD_OFFSET) {	\
-		VMLINUX_SYMBOL(__dyn_array_start) = .;			\
-		*(.dyn_array.init)					\
-		VMLINUX_SYMBOL(__dyn_array_end) = .;			\
-	}								\
-	. = ALIGN((align));						\
-	.per_cpu_dyn_array.init : AT(ADDR(.per_cpu_dyn_array.init) - LOAD_OFFSET) {	\
-		VMLINUX_SYMBOL(__per_cpu_dyn_array_start) = .;		\
-		*(.per_cpu_dyn_array.init)				\
-		VMLINUX_SYMBOL(__per_cpu_dyn_array_end) = .;		\
-	}
 #define SECURITY_INIT							\
 	.security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
 		VMLINUX_SYMBOL(__security_initcall_start) = .;		\
diff --git a/include/linux/init.h b/include/linux/init.h
index 59fbb4aaba6..70ad53e1eab 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -247,49 +247,6 @@ struct obs_kernel_param {
 /* Relies on boot_command_line being set */
 void __init parse_early_param(void);
 
-struct dyn_array {
-	void **name;
-	unsigned long size;
-	unsigned int *nr;
-	unsigned long align;
-	void (*init_work)(void *);
-};
-extern struct dyn_array *__dyn_array_start[], *__dyn_array_end[];
-extern struct dyn_array *__per_cpu_dyn_array_start[], *__per_cpu_dyn_array_end[];
-
-#define DEFINE_DYN_ARRAY_ADDR(nameX, addrX, sizeX, nrX, alignX, init_workX) \
-		static struct dyn_array __dyn_array_##nameX __initdata = \
-		{	.name = (void **)&(nameX),\
-			.size = sizeX,\
-			.nr   = &(nrX),\
-			.align = alignX,\
-			.init_work = init_workX,\
-		}; \
-		static struct dyn_array *__dyn_array_ptr_##nameX __used \
-		__attribute__((__section__(".dyn_array.init"))) = \
-			&__dyn_array_##nameX
-
-#define DEFINE_DYN_ARRAY(nameX, sizeX, nrX, alignX, init_workX) \
-	DEFINE_DYN_ARRAY_ADDR(nameX, nameX, sizeX, nrX, alignX, init_workX)
-
-#define DEFINE_PER_CPU_DYN_ARRAY_ADDR(nameX, addrX, sizeX, nrX, alignX, init_workX) \
-		static struct dyn_array __per_cpu_dyn_array_##nameX __initdata = \
-		{	.name = (void **)&(addrX),\
-			.size = sizeX,\
-			.nr   = &(nrX),\
-			.align = alignX,\
-			.init_work = init_workX,\
-		}; \
-		static struct dyn_array *__per_cpu_dyn_array_ptr_##nameX __used \
-		__attribute__((__section__(".per_cpu_dyn_array.init"))) = \
-			&__per_cpu_dyn_array_##nameX
-
-#define DEFINE_PER_CPU_DYN_ARRAY(nameX, sizeX, nrX, alignX, init_workX) \
-	DEFINE_PER_CPU_DYN_ARRAY_ADDR(nameX, nameX, nrX, alignX, init_workX)
-
-extern void pre_alloc_dyn_array(void);
-extern unsigned long per_cpu_dyn_array_size(unsigned long *align);
-extern void per_cpu_alloc_dyn_array(int cpu, char *ptr);
 #endif /* __ASSEMBLY__ */
 
 /**
diff --git a/include/linux/irq.h b/include/linux/irq.h
index 3f33c779030..38bf89f2ade 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -139,8 +139,6 @@ struct irq_chip {
 	const char	*typename;
 };
 
-struct timer_rand_state;
-struct irq_2_iommu;
 /**
  * struct irq_desc - interrupt descriptor
  *
@@ -167,9 +165,6 @@ struct irq_2_iommu;
  */
 struct irq_desc {
 	unsigned int		irq;
-#ifdef CONFIG_HAVE_DYN_ARRAY
-	unsigned int            *kstat_irqs;
-#endif
 	irq_flow_handler_t	handle_irq;
 	struct irq_chip		*chip;
 	struct msi_desc		*msi_desc;
@@ -198,23 +193,13 @@ struct irq_desc {
 } ____cacheline_internodealigned_in_smp;
 
 
-#ifndef CONFIG_HAVE_DYN_ARRAY
-/* could be removed if we get rid of all irq_desc reference */
 extern struct irq_desc irq_desc[NR_IRQS];
-#else
-extern struct irq_desc *irq_desc;
-#endif
 
 static inline struct irq_desc *irq_to_desc(unsigned int irq)
 {
 	return (irq < nr_irqs) ? irq_desc + irq : NULL;
 }
 
-#ifdef CONFIG_HAVE_DYN_ARRAY
-#define kstat_irqs_this_cpu(DESC) \
-	((DESC)->kstat_irqs[smp_processor_id()])
-#endif
-
 /*
  * Migration helpers for obsolete names, they will go away:
  */
diff --git a/include/linux/kernel_stat.h b/include/linux/kernel_stat.h
index 21249d8c129..a9d0d360b77 100644
--- a/include/linux/kernel_stat.h
+++ b/include/linux/kernel_stat.h
@@ -28,9 +28,7 @@ struct cpu_usage_stat {
 
 struct kernel_stat {
 	struct cpu_usage_stat	cpustat;
-#ifndef CONFIG_HAVE_DYN_ARRAY
        unsigned int irqs[NR_IRQS];
-#endif
 };
 
 DECLARE_PER_CPU(struct kernel_stat, kstat);
@@ -41,20 +39,18 @@ DECLARE_PER_CPU(struct kernel_stat, kstat);
 
 extern unsigned long long nr_context_switches(void);
 
-#ifndef CONFIG_HAVE_DYN_ARRAY
-#define kstat_irqs_this_cpu(irq) \
-	(kstat_this_cpu.irqs[irq])
-#endif
+struct irq_desc;
 
+static inline void kstat_incr_irqs_this_cpu(unsigned int irq,
+					    struct irq_desc *desc)
+{
+	kstat_this_cpu.irqs[irq]++;
+}
 
-#ifndef CONFIG_HAVE_DYN_ARRAY
 static inline unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
 {
        return kstat_cpu(cpu).irqs[irq];
 }
-#else
-extern unsigned int kstat_irqs_cpu(unsigned int irq, int cpu);
-#endif
 
 /*
  * Number of interrupts per specific IRQ source, since bootup
diff --git a/init/Makefile b/init/Makefile
index dc5eeca6eb6..4a243df426f 100644
--- a/init/Makefile
+++ b/init/Makefile
@@ -2,7 +2,7 @@
 # Makefile for the linux kernel.
 #
 
-obj-y                          := main.o dyn_array.o version.o mounts.o
+obj-y                          := main.o version.o mounts.o
 ifneq ($(CONFIG_BLK_DEV_INITRD),y)
 obj-y                          += noinitramfs.o
 else
diff --git a/init/dyn_array.c b/init/dyn_array.c
deleted file mode 100644
index c8d5e2a1858..00000000000
--- a/init/dyn_array.c
+++ /dev/null
@@ -1,120 +0,0 @@
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/kallsyms.h>
-#include <linux/init.h>
-#include <linux/bootmem.h>
-#include <linux/irq.h>
-
-void __init pre_alloc_dyn_array(void)
-{
-#ifdef CONFIG_HAVE_DYN_ARRAY
-	unsigned long total_size = 0, size, phys;
-	unsigned long max_align = 1;
-	struct dyn_array **daa;
-	char *ptr;
-
-	/* get the total size at first */
-	for (daa = __dyn_array_start ; daa < __dyn_array_end; daa++) {
-		struct dyn_array *da = *daa;
-
-		printk(KERN_DEBUG "dyn_array %pF size:%#lx nr:%d align:%#lx\n",
-			da->name, da->size, *da->nr, da->align);
-		size = da->size * (*da->nr);
-		total_size += roundup(size, da->align);
-		if (da->align > max_align)
-			max_align = da->align;
-	}
-	if (total_size)
-		printk(KERN_DEBUG "dyn_array total_size: %#lx\n",
-			 total_size);
-	else
-		return;
-
-	/* allocate them all together */
-	max_align = max_t(unsigned long, max_align, PAGE_SIZE);
-	ptr = __alloc_bootmem(total_size, max_align, 0);
-	phys = virt_to_phys(ptr);
-
-	for (daa = __dyn_array_start ; daa < __dyn_array_end; daa++) {
-		struct dyn_array *da = *daa;
-
-		size = da->size * (*da->nr);
-		phys = roundup(phys, da->align);
-		printk(KERN_DEBUG "dyn_array %pF ==> [%#lx - %#lx]\n",
-			da->name, phys, phys + size);
-		*da->name = phys_to_virt(phys);
-
-		phys += size;
-
-		if (da->init_work)
-			da->init_work(da);
-	}
-#else
-#ifdef CONFIG_GENERIC_HARDIRQS
-	unsigned int i;
-
-	for (i = 0; i < NR_IRQS; i++)
-		irq_desc[i].irq = i;
-#endif
-#endif
-}
-
-unsigned long __init per_cpu_dyn_array_size(unsigned long *align)
-{
-	unsigned long total_size = 0;
-#ifdef CONFIG_HAVE_DYN_ARRAY
-	unsigned long size;
-	struct dyn_array **daa;
-	unsigned max_align = 1;
-
-	for (daa = __per_cpu_dyn_array_start ; daa < __per_cpu_dyn_array_end; daa++) {
-		struct dyn_array *da = *daa;
-
-		printk(KERN_DEBUG "per_cpu_dyn_array %pF size:%#lx nr:%d align:%#lx\n",
-			da->name, da->size, *da->nr, da->align);
-		size = da->size * (*da->nr);
-		total_size += roundup(size, da->align);
-		if (da->align > max_align)
-			max_align = da->align;
-	}
-	if (total_size) {
-		printk(KERN_DEBUG "per_cpu_dyn_array total_size: %#lx\n",
-			 total_size);
-		*align = max_align;
-	}
-#endif
-	return total_size;
-}
-
-#ifdef CONFIG_SMP
-void __init per_cpu_alloc_dyn_array(int cpu, char *ptr)
-{
-#ifdef CONFIG_HAVE_DYN_ARRAY
-	unsigned long size, phys;
-	struct dyn_array **daa;
-	unsigned long addr;
-	void **array;
-
-	phys = virt_to_phys(ptr);
-	for (daa = __per_cpu_dyn_array_start ; daa < __per_cpu_dyn_array_end; daa++) {
-		struct dyn_array *da = *daa;
-
-		size = da->size * (*da->nr);
-		phys = roundup(phys, da->align);
-		printk(KERN_DEBUG "per_cpu_dyn_array %pF ==> [%#lx - %#lx]\n",
-			da->name, phys, phys + size);
-
-		addr = (unsigned long)da->name;
-		addr += per_cpu_offset(cpu);
-		array = (void **)addr;
-		*array = phys_to_virt(phys);
-		*da->name = *array; /* so init_work could use it directly */
-
-		phys += size;
-
-		if (da->init_work)
-			da->init_work(da);
-	}
-#endif
-}
-#endif
diff --git a/init/main.c b/init/main.c
index e81cf427d9c..27f6bf6108e 100644
--- a/init/main.c
+++ b/init/main.c
@@ -391,23 +391,17 @@ EXPORT_SYMBOL(__per_cpu_offset);
 
 static void __init setup_per_cpu_areas(void)
 {
-	unsigned long size, i, old_size;
+	unsigned long size, i;
 	char *ptr;
 	unsigned long nr_possible_cpus = num_possible_cpus();
-	unsigned long align = 1;
-	unsigned da_size;
 
 	/* Copy section for each CPU (we discard the original) */
-	old_size = PERCPU_ENOUGH_ROOM;
-	da_size = per_cpu_dyn_array_size(&align);
-	align = max_t(unsigned long, PAGE_SIZE, align);
-	size = ALIGN(old_size + da_size, align);
+	size = ALIGN(PERCPU_ENOUGH_ROOM, PAGE_SIZE);
 	ptr = alloc_bootmem_pages(size * nr_possible_cpus);
 
 	for_each_possible_cpu(i) {
 		__per_cpu_offset[i] = ptr - __per_cpu_start;
 		memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
-		per_cpu_alloc_dyn_array(i, ptr + old_size);
 		ptr += size;
 	}
 }
@@ -573,7 +567,6 @@ asmlinkage void __init start_kernel(void)
 	printk(KERN_NOTICE);
 	printk(linux_banner);
 	setup_arch(&command_line);
-	pre_alloc_dyn_array();
 	mm_init_owner(&init_mm, &init_task);
 	setup_command_line(command_line);
 	unwind_setup();
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index e6f73dbfcc3..d96d6f687c4 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -326,11 +326,7 @@ handle_simple_irq(unsigned int irq, struct irq_desc *desc)
 	if (unlikely(desc->status & IRQ_INPROGRESS))
 		goto out_unlock;
 	desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
-#ifdef CONFIG_HAVE_DYN_ARRAY
-	kstat_irqs_this_cpu(desc)++;
-#else
-	kstat_irqs_this_cpu(irq)++;
-#endif
+	kstat_incr_irqs_this_cpu(irq, desc);
 
 	action = desc->action;
 	if (unlikely(!action || (desc->status & IRQ_DISABLED)))
@@ -371,11 +367,7 @@ handle_level_irq(unsigned int irq, struct irq_desc *desc)
 	if (unlikely(desc->status & IRQ_INPROGRESS))
 		goto out_unlock;
 	desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
-#ifdef CONFIG_HAVE_DYN_ARRAY
-	kstat_irqs_this_cpu(desc)++;
-#else
-	kstat_irqs_this_cpu(irq)++;
-#endif
+	kstat_incr_irqs_this_cpu(irq, desc);
 
 	/*
 	 * If its disabled or no action available
@@ -422,11 +414,7 @@ handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
 		goto out;
 
 	desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
-#ifdef CONFIG_HAVE_DYN_ARRAY
-	kstat_irqs_this_cpu(desc)++;
-#else
-	kstat_irqs_this_cpu(irq)++;
-#endif
+	kstat_incr_irqs_this_cpu(irq, desc);
 
 	/*
 	 * If its disabled or no action available
@@ -490,11 +478,7 @@ handle_edge_irq(unsigned int irq, struct irq_desc *desc)
 		mask_ack_irq(desc, irq);
 		goto out_unlock;
 	}
-#ifdef CONFIG_HAVE_DYN_ARRAY
-	kstat_irqs_this_cpu(desc)++;
-#else
-	kstat_irqs_this_cpu(irq)++;
-#endif
+	kstat_incr_irqs_this_cpu(irq, desc);
 
 	/* Start handling the irq */
 	desc->chip->ack(irq);
@@ -549,11 +533,7 @@ handle_percpu_irq(unsigned int irq, struct irq_desc *desc)
 {
 	irqreturn_t action_ret;
 
-#ifdef CONFIG_HAVE_DYN_ARRAY
-	kstat_irqs_this_cpu(desc)++;
-#else
-	kstat_irqs_this_cpu(irq)++;
-#endif
+	kstat_incr_irqs_this_cpu(irq, desc);
 
 	if (desc->chip->ack)
 		desc->chip->ack(irq);
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index f837133cdfb..9fe86b3a60a 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -18,11 +18,6 @@
 
 #include "internals.h"
 
-/*
- * lockdep: we want to handle all irq_desc locks as a single lock-class:
- */
-static struct lock_class_key irq_desc_lock_class;
-
 /**
  * handle_bad_irq - handle spurious and unhandled irqs
  * @irq:       the interrupt number
@@ -30,15 +25,10 @@ static struct lock_class_key irq_desc_lock_class;
  *
  * Handles spurious and unhandled IRQ's. It also prints a debugmessage.
  */
-void
-handle_bad_irq(unsigned int irq, struct irq_desc *desc)
+void handle_bad_irq(unsigned int irq, struct irq_desc *desc)
 {
 	print_irq_desc(irq, desc);
-#ifdef CONFIG_HAVE_DYN_ARRAY
-	kstat_irqs_this_cpu(desc)++;
-#else
-	kstat_irqs_this_cpu(irq)++;
-#endif
+	kstat_incr_irqs_this_cpu(irq, desc);
 	ack_bad_irq(irq);
 }
 
@@ -59,80 +49,6 @@ handle_bad_irq(unsigned int irq, struct irq_desc *desc)
 int nr_irqs = NR_IRQS;
 EXPORT_SYMBOL_GPL(nr_irqs);
 
-#ifdef CONFIG_HAVE_DYN_ARRAY
-static struct irq_desc irq_desc_init = {
-	.irq = -1U,
-	.status = IRQ_DISABLED,
-	.chip = &no_irq_chip,
-	.handle_irq = handle_bad_irq,
-	.depth = 1,
-	.lock = __SPIN_LOCK_UNLOCKED(irq_desc_init.lock),
-#ifdef CONFIG_SMP
-	.affinity = CPU_MASK_ALL
-#endif
-};
-
-
-static void init_one_irq_desc(struct irq_desc *desc)
-{
-	memcpy(desc, &irq_desc_init, sizeof(struct irq_desc));
-	lockdep_set_class(&desc->lock, &irq_desc_lock_class);
-}
-
-extern int after_bootmem;
-extern void *__alloc_bootmem_nopanic(unsigned long size,
-			     unsigned long align,
-			     unsigned long goal);
-
-static void init_kstat_irqs(struct irq_desc *desc, int nr_desc, int nr)
-{
-	unsigned long bytes, total_bytes;
-	char *ptr;
-	int i;
-	unsigned long phys;
-
-	/* Compute how many bytes we need per irq and allocate them */
-	bytes = nr * sizeof(unsigned int);
-	total_bytes = bytes * nr_desc;
-	if (after_bootmem)
-		ptr = kzalloc(total_bytes, GFP_ATOMIC);
-	else
-		ptr = __alloc_bootmem_nopanic(total_bytes, PAGE_SIZE, 0);
-
-	if (!ptr)
-		panic(" can not allocate kstat_irqs\n");
-
-	phys = __pa(ptr);
-	printk(KERN_DEBUG "kstat_irqs ==> [%#lx - %#lx]\n", phys, phys + total_bytes);
-
-	for (i = 0; i < nr_desc; i++) {
-		desc[i].kstat_irqs = (unsigned int *)ptr;
-		ptr += bytes;
-	}
-}
-
-static void __init init_work(void *data)
-{
-	struct dyn_array *da = data;
-	int i;
-	struct  irq_desc *desc;
-
-	desc = *da->name;
-
-	for (i = 0; i < *da->nr; i++) {
-		init_one_irq_desc(&desc[i]);
-		desc[i].irq = i;
-	}
-
-	/* init kstat_irqs, nr_cpu_ids is ready already */
-	init_kstat_irqs(desc, *da->nr, nr_cpu_ids);
-}
-
-struct irq_desc *irq_desc;
-DEFINE_DYN_ARRAY(irq_desc, sizeof(struct irq_desc), nr_irqs, PAGE_SIZE, init_work);
-
-#else
-
 struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
 	[0 ... NR_IRQS-1] = {
 		.status = IRQ_DISABLED,
@@ -146,8 +62,6 @@ struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
 	}
 };
 
-#endif
-
 /*
  * What should we do if we get a hw irq event on an illegal vector?
  * Each architecture has to answer this themself.
@@ -258,11 +172,8 @@ unsigned int __do_IRQ(unsigned int irq)
 	struct irqaction *action;
 	unsigned int status;
 
-#ifdef CONFIG_HAVE_DYN_ARRAY
-	kstat_irqs_this_cpu(desc)++;
-#else
-	kstat_irqs_this_cpu(irq)++;
-#endif
+	kstat_incr_irqs_this_cpu(irq, desc);
+
 	if (CHECK_IRQ_PER_CPU(desc->status)) {
 		irqreturn_t action_ret;
 
@@ -351,23 +262,16 @@ out:
 
 
 #ifdef CONFIG_TRACE_IRQFLAGS
+/*
+ * lockdep: we want to handle all irq_desc locks as a single lock-class:
+ */
+static struct lock_class_key irq_desc_lock_class;
+
 void early_init_irq_lock_class(void)
 {
-#ifndef CONFIG_HAVE_DYN_ARRAY
 	int i;
 
 	for (i = 0; i < nr_irqs; i++)
 		lockdep_set_class(&irq_desc[i].lock, &irq_desc_lock_class);
-#endif
 }
 #endif
-
-#ifdef CONFIG_HAVE_DYN_ARRAY
-unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
-{
-	struct irq_desc *desc = irq_to_desc(irq);
-	return desc->kstat_irqs[cpu];
-}
-#endif
-EXPORT_SYMBOL(kstat_irqs_cpu);
-