Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/lin…

…ux/kernel/git/tip/linux-2.6-tip

* 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (116 commits)
  x86: Enable forced interrupt threading support
  x86: Mark low level interrupts IRQF_NO_THREAD
  x86: Use generic show_interrupts
  x86: ioapic: Avoid redundant lookup of irq_cfg
  x86: ioapic: Use new move_irq functions
  x86: Use the proper accessors in fixup_irqs()
  x86: ioapic: Use irq_data->state
  x86: ioapic: Simplify irq chip and handler setup
  x86: Cleanup the genirq name space
  genirq: Add chip flag to force mask on suspend
  genirq: Add desc->irq_data accessor
  genirq: Add comments to Kconfig switches
  genirq: Fixup fasteoi handler for oneshot mode
  genirq: Provide forced interrupt threading
  sched: Switch wait_task_inactive to schedule_hrtimeout()
  genirq: Add IRQF_NO_THREAD
  genirq: Allow shared oneshot interrupts
  genirq: Prepare the handling of shared oneshot interrupts
  genirq: Make warning in handle_percpu_event useful
  x86: ioapic: Move trigger defines to io_apic.h
  ...

Fix up trivial(?) conflicts in arch/x86/pci/xen.c due to genirq name
space changes clashing with the Xen cleanups.  The set_irq_msi() had
moved to xen_bind_pirq_msi_to_irq().

Documentation/kernel-parameters.txt

@@ -2444,6 +2444,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 			<deci-seconds>: poll all this frequency
 			0: no polling (default)
 
+	threadirqs	[KNL]
+			Force threading of all interrupt handlers except those
+			marked explicitely IRQF_NO_THREAD.
+
 	topology=	[S390]
 			Format: {off | on}
 			Specify if the kernel should make use of the cpu

arch/x86/Kconfig

@@ -68,6 +68,8 @@ config X86
 	select GENERIC_FIND_NEXT_BIT
 	select GENERIC_IRQ_PROBE
 	select GENERIC_PENDING_IRQ if SMP
+	select GENERIC_IRQ_SHOW
+	select IRQ_FORCED_THREADING
 	select USE_GENERIC_SMP_HELPERS if SMP
 
 config INSTRUCTION_DECODER
@@ -813,7 +815,7 @@ config X86_LOCAL_APIC
 
 config X86_IO_APIC
 	def_bool y
-	depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
+	depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_IOAPIC
 
 config X86_VISWS_APIC
 	def_bool y

arch/x86/include/asm/apicdef.h

@@ -426,4 +426,16 @@ struct local_apic {
 #else
  #define BAD_APICID 0xFFFFu
 #endif
+
+enum ioapic_irq_destination_types {
+	dest_Fixed		= 0,
+	dest_LowestPrio		= 1,
+	dest_SMI		= 2,
+	dest__reserved_1	= 3,
+	dest_NMI		= 4,
+	dest_INIT		= 5,
+	dest__reserved_2	= 6,
+	dest_ExtINT		= 7
+};
+
 #endif /* _ASM_X86_APICDEF_H */

arch/x86/include/asm/io_apic.h

@@ -63,17 +63,6 @@ union IO_APIC_reg_03 {
 	} __attribute__ ((packed)) bits;
 };
 
-enum ioapic_irq_destination_types {
-	dest_Fixed = 0,
-	dest_LowestPrio = 1,
-	dest_SMI = 2,
-	dest__reserved_1 = 3,
-	dest_NMI = 4,
-	dest_INIT = 5,
-	dest__reserved_2 = 6,
-	dest_ExtINT = 7
-};
-
 struct IO_APIC_route_entry {
 	__u32	vector		:  8,
 		delivery_mode	:  3,	/* 000: FIXED
@@ -106,6 +95,10 @@ struct IR_IO_APIC_route_entry {
 		index		: 15;
 } __attribute__ ((packed));
 
+#define IOAPIC_AUTO     -1
+#define IOAPIC_EDGE     0
+#define IOAPIC_LEVEL    1
+
 #ifdef CONFIG_X86_IO_APIC
 
 /*
@@ -150,18 +143,15 @@ extern int timer_through_8259;
 #define io_apic_assign_pci_irqs \
 	(mp_irq_entries && !skip_ioapic_setup && io_apic_irqs)
 
-extern u8 io_apic_unique_id(u8 id);
-extern int io_apic_get_unique_id(int ioapic, int apic_id);
-extern int io_apic_get_version(int ioapic);
-extern int io_apic_get_redir_entries(int ioapic);
-
 struct io_apic_irq_attr;
 extern int io_apic_set_pci_routing(struct device *dev, int irq,
 		 struct io_apic_irq_attr *irq_attr);
 void setup_IO_APIC_irq_extra(u32 gsi);
 extern void ioapic_and_gsi_init(void);
 extern void ioapic_insert_resources(void);
 
+int io_apic_setup_irq_pin(unsigned int irq, int node, struct io_apic_irq_attr *attr);
+
 extern struct IO_APIC_route_entry **alloc_ioapic_entries(void);
 extern void free_ioapic_entries(struct IO_APIC_route_entry **ioapic_entries);
 extern int save_IO_APIC_setup(struct IO_APIC_route_entry **ioapic_entries);
@@ -186,6 +176,8 @@ extern void __init pre_init_apic_IRQ0(void);
 
 extern void mp_save_irq(struct mpc_intsrc *m);
 
+extern void disable_ioapic_support(void);
+
 #else  /* !CONFIG_X86_IO_APIC */
 
 #define io_apic_assign_pci_irqs 0
@@ -199,6 +191,26 @@ static inline int mp_find_ioapic(u32 gsi) { return 0; }
 struct io_apic_irq_attr;
 static inline int io_apic_set_pci_routing(struct device *dev, int irq,
 		 struct io_apic_irq_attr *irq_attr) { return 0; }
+
+static inline struct IO_APIC_route_entry **alloc_ioapic_entries(void)
+{
+	return NULL;
+}
+
+static inline void free_ioapic_entries(struct IO_APIC_route_entry **ent) { }
+static inline int save_IO_APIC_setup(struct IO_APIC_route_entry **ent)
+{
+	return -ENOMEM;
+}
+
+static inline void mask_IO_APIC_setup(struct IO_APIC_route_entry **ent) { }
+static inline int restore_IO_APIC_setup(struct IO_APIC_route_entry **ent)
+{
+	return -ENOMEM;
+}
+
+static inline void mp_save_irq(struct mpc_intsrc *m) { };
+static inline void disable_ioapic_support(void) { }
 #endif
 
 #endif /* _ASM_X86_IO_APIC_H */

arch/x86/kernel/apic/apic.c

@@ -43,6 +43,7 @@
 #include <asm/i8259.h>
 #include <asm/proto.h>
 #include <asm/apic.h>
+#include <asm/io_apic.h>
 #include <asm/desc.h>
 #include <asm/hpet.h>
 #include <asm/idle.h>
@@ -1209,7 +1210,7 @@ void __cpuinit setup_local_APIC(void)
 		rdtscll(tsc);
 
 	if (disable_apic) {
-		arch_disable_smp_support();
+		disable_ioapic_support();
 		return;
 	}
 
@@ -1448,7 +1449,7 @@ int __init enable_IR(void)
 void __init enable_IR_x2apic(void)
 {
 	unsigned long flags;
-	struct IO_APIC_route_entry **ioapic_entries = NULL;
+	struct IO_APIC_route_entry **ioapic_entries;
 	int ret, x2apic_enabled = 0;
 	int dmar_table_init_ret;