[GIT PULL] x86/platform changes for v3.6

[Ingo Molnar <mingo@kernel.org>]

Linus,

Please pull the latest x86-platform-for-linus git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86-platform-for-linus

   HEAD: 36d93d88a5396baa135f8bcde7b8501dfe3b8e53 Revert "x86/early_printk: Replace obsolete simple_strtoul() usage with kstrtoint()"

This tree mostly involves various APIC driver 
cleanups/robustization, and vSMP motivated platform callback 
improvements/cleanups.

out-of-topic modifications in x86-platform-for-linus:
-----------------------------------------------------
drivers/iommu/intel_irq_remapping.c# 7eb9ae0: irq/apic: Use config_enabled(CONF
                                   # ed88bed: x86/apic/irq_remap: Silence a bog
                                   # ff16432: x86/apic: Make cpu_mask_to_apicid
drivers/iommu/irq_remapping.c      # 7eb9ae0: irq/apic: Use config_enabled(CONF
drivers/iommu/irq_remapping.h      # 7eb9ae0: irq/apic: Use config_enabled(CONF
include/linux/irq.h                # 7eb9ae0: irq/apic: Use config_enabled(CONF

 Thanks,

	Ingo

------------------>
Alexander Gordeev (14):
      x86/apic: Trivial whitespace fixes
      x86/apic: Factor out default target_cpus() operation
      x86/apic: Factor out default cpu_mask_to_apicid() operations
      x86/apic: Factor out default vector_allocation_domain() operation
      x86/apic: Try to spread IRQ vectors to different priority levels
      x86/apic: Avoid useless scanning thru a cpumask in assign_irq_vector()
      x86/apic: Make cpu_mask_to_apicid() operations return error code
      x86/apic: Make cpu_mask_to_apicid() operations check cpu_online_mask
      x86/x2apic/cluster: Vector_allocation_domain() should return a value
      x86/apic: Eliminate cpu_mask_to_apicid() operation
      x86/apic: Fix ugly casting and branching in cpu_mask_to_apicid_and()
      x86/apic/es7000+summit: Fix compile warning in cpu_mask_to_apicid()
      x86/apic/es7000+summit: Always make valid apicid from a cpumask
      x86/apic/es7000: Make apicid of a cluster (not CPU) from a cpumask

Dan Carpenter (1):
      x86/apic/irq_remap: Silence a bogus pr_err()

Feng Tang (1):
      Revert "x86/platform: Add a wallclock_init func to x86_platforms ops"

Ido Yariv (3):
      x86/platform: Introduce APIC post-initialization callback
      x86/vsmp: Fix linker error when CONFIG_PROC_FS is not set
      x86/vsmp: Fix vector_allocation_domain's return value

Ingo Molnar (1):
      Revert "x86/early_printk: Replace obsolete simple_strtoul() usage with kstrtoint()"

Jiang Liu (1):
      x86: Return IRQ_SET_MASK_OK_NOCOPY from irq affinity functions

Ravikiran Thirumalai (1):
      x86/vsmp: Ignore IOAPIC IRQ affinity if possible

Shuah Khan (1):
      x86/early_printk: Replace obsolete simple_strtoul() usage with kstrtoint()

Suresh Siddha (6):
      x86/irq: Update irq_cfg domain unless the new affinity is a subset of the current domain
      x86/x2apic/cluster: Use all the members of one cluster specified in the smp_affinity mask for the interrupt destination
      irq/apic: Use config_enabled(CONFIG_SMP) checks to clean up irq_set_affinity() for UP
      x86/apic: Optimize cpu traversal in __assign_irq_vector() using domain membership
      x86/apic/x2apic: Limit the vector reservation to the user specified mask
      x86/apic/x2apic: Use multiple cluster members for the irq destination only with the explicit affinity


 arch/x86/include/asm/apic.h           |   61 +++++--
 arch/x86/include/asm/x2apic.h         |   18 --
 arch/x86/include/asm/x86_init.h       |    4 +-
 arch/x86/kernel/apic/apic.c           |   19 ++
 arch/x86/kernel/apic/apic_flat_64.c   |   76 +-------
 arch/x86/kernel/apic/apic_noop.c      |    9 +-
 arch/x86/kernel/apic/apic_numachip.c  |   50 +-----
 arch/x86/kernel/apic/bigsmp_32.c      |   48 +----
 arch/x86/kernel/apic/es7000_32.c      |   51 ++----
 arch/x86/kernel/apic/io_apic.c        |  312 +++++++++++++++++----------------
 arch/x86/kernel/apic/numaq_32.c       |   30 +---
 arch/x86/kernel/apic/probe_32.c       |   23 +--
 arch/x86/kernel/apic/probe_64.c       |   11 +-
 arch/x86/kernel/apic/summit_32.c      |   46 ++---
 arch/x86/kernel/apic/x2apic_cluster.c |   82 ++++++---
 arch/x86/kernel/apic/x2apic_phys.c    |   39 +----
 arch/x86/kernel/apic/x2apic_uv_x.c    |   45 ++---
 arch/x86/kernel/setup.c               |    2 -
 arch/x86/kernel/vsmp_64.c             |   44 ++++-
 arch/x86/kernel/x86_init.c            |    2 -
 arch/x86/platform/uv/uv_irq.c         |    9 +-
 drivers/iommu/intel_irq_remapping.c   |   20 ++-
 drivers/iommu/irq_remapping.c         |    5 +-
 drivers/iommu/irq_remapping.h         |    2 -
 include/linux/irq.h                   |    2 -
 25 files changed, 429 insertions(+), 581 deletions(-)

diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index eaff479..88093c1 100644
--- a/arch/x86/include/asm/apic.h
+++ b/arch/x86/include/asm/apic.h
@@ -306,7 +306,8 @@ struct apic {
 	unsigned long (*check_apicid_used)(physid_mask_t *map, int apicid);
 	unsigned long (*check_apicid_present)(int apicid);
 
-	void (*vector_allocation_domain)(int cpu, struct cpumask *retmask);
+	void (*vector_allocation_domain)(int cpu, struct cpumask *retmask,
+					 const struct cpumask *mask);
 	void (*init_apic_ldr)(void);
 
 	void (*ioapic_phys_id_map)(physid_mask_t *phys_map, physid_mask_t *retmap);
@@ -331,9 +332,9 @@ struct apic {
 	unsigned long (*set_apic_id)(unsigned int id);
 	unsigned long apic_id_mask;
 
-	unsigned int (*cpu_mask_to_apicid)(const struct cpumask *cpumask);
-	unsigned int (*cpu_mask_to_apicid_and)(const struct cpumask *cpumask,
-					       const struct cpumask *andmask);
+	int (*cpu_mask_to_apicid_and)(const struct cpumask *cpumask,
+				      const struct cpumask *andmask,
+				      unsigned int *apicid);
 
 	/* ipi */
 	void (*send_IPI_mask)(const struct cpumask *mask, int vector);
@@ -537,6 +538,11 @@ static inline const struct cpumask *default_target_cpus(void)
 #endif
 }
 
+static inline const struct cpumask *online_target_cpus(void)
+{
+	return cpu_online_mask;
+}
+
 DECLARE_EARLY_PER_CPU(u16, x86_bios_cpu_apicid);
 
 
@@ -586,21 +592,50 @@ static inline int default_phys_pkg_id(int cpuid_apic, int index_msb)
 
 #endif
 
-static inline unsigned int
-default_cpu_mask_to_apicid(const struct cpumask *cpumask)
+static inline int
+flat_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
+			    const struct cpumask *andmask,
+			    unsigned int *apicid)
 {
-	return cpumask_bits(cpumask)[0] & APIC_ALL_CPUS;
+	unsigned long cpu_mask = cpumask_bits(cpumask)[0] &
+				 cpumask_bits(andmask)[0] &
+				 cpumask_bits(cpu_online_mask)[0] &
+				 APIC_ALL_CPUS;
+
+	if (likely(cpu_mask)) {
+		*apicid = (unsigned int)cpu_mask;
+		return 0;
+	} else {
+		return -EINVAL;
+	}
 }
 
-static inline unsigned int
+extern int
 default_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
-			       const struct cpumask *andmask)
+			       const struct cpumask *andmask,
+			       unsigned int *apicid);
+
+static inline void
+flat_vector_allocation_domain(int cpu, struct cpumask *retmask,
+			      const struct cpumask *mask)
 {
-	unsigned long mask1 = cpumask_bits(cpumask)[0];
-	unsigned long mask2 = cpumask_bits(andmask)[0];
-	unsigned long mask3 = cpumask_bits(cpu_online_mask)[0];
+	/* Careful. Some cpus do not strictly honor the set of cpus
+	 * specified in the interrupt destination when using lowest
+	 * priority interrupt delivery mode.
+	 *
+	 * In particular there was a hyperthreading cpu observed to
+	 * deliver interrupts to the wrong hyperthread when only one
+	 * hyperthread was specified in the interrupt desitination.
+	 */
+	cpumask_clear(retmask);
+	cpumask_bits(retmask)[0] = APIC_ALL_CPUS;
+}
 
-	return (unsigned int)(mask1 & mask2 & mask3);
+static inline void
+default_vector_allocation_domain(int cpu, struct cpumask *retmask,
+				 const struct cpumask *mask)
+{
+	cpumask_copy(retmask, cpumask_of(cpu));
 }
 
 static inline unsigned long default_check_apicid_used(physid_mask_t *map, int apicid)
diff --git a/arch/x86/include/asm/x2apic.h b/arch/x86/include/asm/x2apic.h
index 92e54ab..f90f0a5 100644
--- a/arch/x86/include/asm/x2apic.h
+++ b/arch/x86/include/asm/x2apic.h
@@ -9,15 +9,6 @@
 #include <asm/ipi.h>
 #include <linux/cpumask.h>
 
-/*
- * Need to use more than cpu 0, because we need more vectors
- * when MSI-X are used.
- */
-static const struct cpumask *x2apic_target_cpus(void)
-{
-	return cpu_online_mask;
-}
-
 static int x2apic_apic_id_valid(int apicid)
 {
 	return 1;
@@ -28,15 +19,6 @@ static int x2apic_apic_id_registered(void)
 	return 1;
 }
 
-/*
- * For now each logical cpu is in its own vector allocation domain.
- */
-static void x2apic_vector_allocation_domain(int cpu, struct cpumask *retmask)
-{
-	cpumask_clear(retmask);
-	cpumask_set_cpu(cpu, retmask);
-}
-
 static void
 __x2apic_send_IPI_dest(unsigned int apicid, int vector, unsigned int dest)
 {
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index c090af1..38155f6 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -156,7 +156,6 @@ struct x86_cpuinit_ops {
 /**
  * struct x86_platform_ops - platform specific runtime functions
  * @calibrate_tsc:		calibrate TSC
- * @wallclock_init:		init the wallclock device
  * @get_wallclock:		get time from HW clock like RTC etc.
  * @set_wallclock:		set time back to HW clock
  * @is_untracked_pat_range	exclude from PAT logic
@@ -164,10 +163,10 @@ struct x86_cpuinit_ops {
  * @i8042_detect		pre-detect if i8042 controller exists
  * @save_sched_clock_state:	save state for sched_clock() on suspend
  * @restore_sched_clock_state:	restore state for sched_clock() on resume
+ * @apic_post_init:		adjust apic if neeeded
  */
 struct x86_platform_ops {
 	unsigned long (*calibrate_tsc)(void);
-	void (*wallclock_init)(void);
 	unsigned long (*get_wallclock)(void);
 	int (*set_wallclock)(unsigned long nowtime);
 	void (*iommu_shutdown)(void);
@@ -177,6 +176,7 @@ struct x86_platform_ops {
 	int (*i8042_detect)(void);
 	void (*save_sched_clock_state)(void);
 	void (*restore_sched_clock_state)(void);
+	void (*apic_post_init)(void);
 };
 
 struct pci_dev;
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 39a222e..c421512 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -2123,6 +2123,25 @@ void default_init_apic_ldr(void)
 	apic_write(APIC_LDR, val);
 }
 
+int default_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
+				   const struct cpumask *andmask,
+				   unsigned int *apicid)
+{
+	unsigned int cpu;
+
+	for_each_cpu_and(cpu, cpumask, andmask) {
+		if (cpumask_test_cpu(cpu, cpu_online_mask))
+			break;
+	}
+
+	if (likely(cpu < nr_cpu_ids)) {
+		*apicid = per_cpu(x86_cpu_to_apicid, cpu);
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
 /*
  * Power management
  */
diff --git a/arch/x86/kernel/apic/apic_flat_64.c b/arch/x86/kernel/apic/apic_flat_64.c
index 0e881c4..00c77cf 100644
--- a/arch/x86/kernel/apic/apic_flat_64.c
+++ b/arch/x86/kernel/apic/apic_flat_64.c
@@ -36,25 +36,6 @@ static int flat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 	return 1;
 }
 
-static const struct cpumask *flat_target_cpus(void)
-{
-	return cpu_online_mask;
-}
-
-static void flat_vector_allocation_domain(int cpu, struct cpumask *retmask)
-{
-	/* Careful. Some cpus do not strictly honor the set of cpus
-	 * specified in the interrupt destination when using lowest
-	 * priority interrupt delivery mode.
-	 *
-	 * In particular there was a hyperthreading cpu observed to
-	 * deliver interrupts to the wrong hyperthread when only one
-	 * hyperthread was specified in the interrupt desitination.
-	 */
-	cpumask_clear(retmask);
-	cpumask_bits(retmask)[0] = APIC_ALL_CPUS;
-}
-
 /*
  * Set up the logical destination ID.
  *
@@ -92,7 +73,7 @@ static void flat_send_IPI_mask(const struct cpumask *cpumask, int vector)
 }
 
 static void
- flat_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector)
+flat_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector)
 {
 	unsigned long mask = cpumask_bits(cpumask)[0];
 	int cpu = smp_processor_id();
@@ -186,7 +167,7 @@ static struct apic apic_flat =  {
 	.irq_delivery_mode		= dest_LowestPrio,
 	.irq_dest_mode			= 1, /* logical */
 
-	.target_cpus			= flat_target_cpus,
+	.target_cpus			= online_target_cpus,
 	.disable_esr			= 0,
 	.dest_logical			= APIC_DEST_LOGICAL,
 	.check_apicid_used		= NULL,
@@ -210,8 +191,7 @@ static struct apic apic_flat =  {
 	.set_apic_id			= set_apic_id,
 	.apic_id_mask			= 0xFFu << 24,
 
-	.cpu_mask_to_apicid		= default_cpu_mask_to_apicid,
-	.cpu_mask_to_apicid_and		= default_cpu_mask_to_apicid_and,
+	.cpu_mask_to_apicid_and		= flat_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= flat_send_IPI_mask,
 	.send_IPI_mask_allbutself	= flat_send_IPI_mask_allbutself,
@@ -262,17 +242,6 @@ static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 	return 0;
 }
 
-static const struct cpumask *physflat_target_cpus(void)
-{
-	return cpu_online_mask;
-}
-
-static void physflat_vector_allocation_domain(int cpu, struct cpumask *retmask)
-{
-	cpumask_clear(retmask);
-	cpumask_set_cpu(cpu, retmask);
-}
-
 static void physflat_send_IPI_mask(const struct cpumask *cpumask, int vector)
 {
 	default_send_IPI_mask_sequence_phys(cpumask, vector);
@@ -294,38 +263,6 @@ static void physflat_send_IPI_all(int vector)
 	physflat_send_IPI_mask(cpu_online_mask, vector);
 }
 
-static unsigned int physflat_cpu_mask_to_apicid(const struct cpumask *cpumask)
-{
-	int cpu;
-
-	/*
-	 * We're using fixed IRQ delivery, can only return one phys APIC ID.
-	 * May as well be the first.
-	 */
-	cpu = cpumask_first(cpumask);
-	if ((unsigned)cpu < nr_cpu_ids)
-		return per_cpu(x86_cpu_to_apicid, cpu);
-	else
-		return BAD_APICID;
-}
-
-static unsigned int
-physflat_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
-				const struct cpumask *andmask)
-{
-	int cpu;
-
-	/*
-	 * We're using fixed IRQ delivery, can only return one phys APIC ID.
-	 * May as well be the first.
-	 */
-	for_each_cpu_and(cpu, cpumask, andmask) {
-		if (cpumask_test_cpu(cpu, cpu_online_mask))
-			break;
-	}
-	return per_cpu(x86_cpu_to_apicid, cpu);
-}
-
 static int physflat_probe(void)
 {
 	if (apic == &apic_physflat || num_possible_cpus() > 8)
@@ -345,13 +282,13 @@ static struct apic apic_physflat =  {
 	.irq_delivery_mode		= dest_Fixed,
 	.irq_dest_mode			= 0, /* physical */
 
-	.target_cpus			= physflat_target_cpus,
+	.target_cpus			= online_target_cpus,
 	.disable_esr			= 0,
 	.dest_logical			= 0,
 	.check_apicid_used		= NULL,
 	.check_apicid_present		= NULL,
 
-	.vector_allocation_domain	= physflat_vector_allocation_domain,
+	.vector_allocation_domain	= default_vector_allocation_domain,
 	/* not needed, but shouldn't hurt: */
 	.init_apic_ldr			= flat_init_apic_ldr,
 
@@ -370,8 +307,7 @@ static struct apic apic_physflat =  {
 	.set_apic_id			= set_apic_id,
 	.apic_id_mask			= 0xFFu << 24,
 
-	.cpu_mask_to_apicid		= physflat_cpu_mask_to_apicid,
-	.cpu_mask_to_apicid_and		= physflat_cpu_mask_to_apicid_and,
+	.cpu_mask_to_apicid_and		= default_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= physflat_send_IPI_mask,
 	.send_IPI_mask_allbutself	= physflat_send_IPI_mask_allbutself,
diff --git a/arch/x86/kernel/apic/apic_noop.c b/arch/x86/kernel/apic/apic_noop.c
index a6e4c6e..e145f28 100644
--- a/arch/x86/kernel/apic/apic_noop.c
+++ b/arch/x86/kernel/apic/apic_noop.c
@@ -100,12 +100,12 @@ static unsigned long noop_check_apicid_present(int bit)
 	return physid_isset(bit, phys_cpu_present_map);
 }
 
-static void noop_vector_allocation_domain(int cpu, struct cpumask *retmask)
+static void noop_vector_allocation_domain(int cpu, struct cpumask *retmask,
+					  const struct cpumask *mask)
 {
 	if (cpu != 0)
 		pr_warning("APIC: Vector allocated for non-BSP cpu\n");
-	cpumask_clear(retmask);
-	cpumask_set_cpu(cpu, retmask);
+	cpumask_copy(retmask, cpumask_of(cpu));
 }
 
 static u32 noop_apic_read(u32 reg)
@@ -159,8 +159,7 @@ struct apic apic_noop = {
 	.set_apic_id			= NULL,
 	.apic_id_mask			= 0x0F << 24,
 
-	.cpu_mask_to_apicid		= default_cpu_mask_to_apicid,
-	.cpu_mask_to_apicid_and		= default_cpu_mask_to_apicid_and,
+	.cpu_mask_to_apicid_and		= flat_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= noop_send_IPI_mask,
 	.send_IPI_mask_allbutself	= noop_send_IPI_mask_allbutself,
diff --git a/arch/x86/kernel/apic/apic_numachip.c b/arch/x86/kernel/apic/apic_numachip.c
index 6ec6d5d..bc552cf 100644
--- a/arch/x86/kernel/apic/apic_numachip.c
+++ b/arch/x86/kernel/apic/apic_numachip.c
@@ -72,17 +72,6 @@ static int numachip_phys_pkg_id(int initial_apic_id, int index_msb)
 	return initial_apic_id >> index_msb;
 }
 
-static const struct cpumask *numachip_target_cpus(void)
-{
-	return cpu_online_mask;
-}
-
-static void numachip_vector_allocation_domain(int cpu, struct cpumask *retmask)
-{
-	cpumask_clear(retmask);
-	cpumask_set_cpu(cpu, retmask);
-}
-
 static int __cpuinit numachip_wakeup_secondary(int phys_apicid, unsigned long start_rip)
 {
 	union numachip_csr_g3_ext_irq_gen int_gen;
@@ -157,38 +146,6 @@ static void numachip_send_IPI_self(int vector)
 	__default_send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
 }
 
-static unsigned int numachip_cpu_mask_to_apicid(const struct cpumask *cpumask)
-{
-	int cpu;
-
-	/*
-	 * We're using fixed IRQ delivery, can only return one phys APIC ID.
-	 * May as well be the first.
-	 */
-	cpu = cpumask_first(cpumask);
-	if (likely((unsigned)cpu < nr_cpu_ids))
-		return per_cpu(x86_cpu_to_apicid, cpu);
-
-	return BAD_APICID;
-}
-
-static unsigned int
-numachip_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
-				const struct cpumask *andmask)
-{
-	int cpu;
-
-	/*
-	 * We're using fixed IRQ delivery, can only return one phys APIC ID.
-	 * May as well be the first.
-	 */
-	for_each_cpu_and(cpu, cpumask, andmask) {
-		if (cpumask_test_cpu(cpu, cpu_online_mask))
-			break;
-	}
-	return per_cpu(x86_cpu_to_apicid, cpu);
-}
-
 static int __init numachip_probe(void)
 {
 	return apic == &apic_numachip;
@@ -253,13 +210,13 @@ static struct apic apic_numachip __refconst = {
 	.irq_delivery_mode		= dest_Fixed,
 	.irq_dest_mode			= 0, /* physical */
 
-	.target_cpus			= numachip_target_cpus,
+	.target_cpus			= online_target_cpus,
 	.disable_esr			= 0,
 	.dest_logical			= 0,
 	.check_apicid_used		= NULL,
 	.check_apicid_present		= NULL,
 
-	.vector_allocation_domain	= numachip_vector_allocation_domain,
+	.vector_allocation_domain	= default_vector_allocation_domain,
 	.init_apic_ldr			= flat_init_apic_ldr,
 
 	.ioapic_phys_id_map		= NULL,
@@ -277,8 +234,7 @@ static struct apic apic_numachip __refconst = {
 	.set_apic_id			= set_apic_id,
 	.apic_id_mask			= 0xffU << 24,
 
-	.cpu_mask_to_apicid		= numachip_cpu_mask_to_apicid,
-	.cpu_mask_to_apicid_and		= numachip_cpu_mask_to_apicid_and,
+	.cpu_mask_to_apicid_and		= default_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= numachip_send_IPI_mask,
 	.send_IPI_mask_allbutself	= numachip_send_IPI_mask_allbutself,
diff --git a/arch/x86/kernel/apic/bigsmp_32.c b/arch/x86/kernel/apic/bigsmp_32.c
index 31fbdbf..d50e364 100644
--- a/arch/x86/kernel/apic/bigsmp_32.c
+++ b/arch/x86/kernel/apic/bigsmp_32.c
@@ -26,15 +26,6 @@ static int bigsmp_apic_id_registered(void)
 	return 1;
 }
 
-static const struct cpumask *bigsmp_target_cpus(void)
-{
-#ifdef CONFIG_SMP
-	return cpu_online_mask;
-#else
-	return cpumask_of(0);
-#endif
-}
-
 static unsigned long bigsmp_check_apicid_used(physid_mask_t *map, int apicid)
 {
 	return 0;
@@ -105,32 +96,6 @@ static int bigsmp_check_phys_apicid_present(int phys_apicid)
 	return 1;
 }
 
-/* As we are using single CPU as destination, pick only one CPU here */
-static unsigned int bigsmp_cpu_mask_to_apicid(const struct cpumask *cpumask)
-{
-	int cpu = cpumask_first(cpumask);
-
-	if (cpu < nr_cpu_ids)
-		return cpu_physical_id(cpu);
-	return BAD_APICID;
-}
-
-static unsigned int bigsmp_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
-			      const struct cpumask *andmask)
-{
-	int cpu;
-
-	/*
-	 * We're using fixed IRQ delivery, can only return one phys APIC ID.
-	 * May as well be the first.
-	 */
-	for_each_cpu_and(cpu, cpumask, andmask) {
-		if (cpumask_test_cpu(cpu, cpu_online_mask))
-			return cpu_physical_id(cpu);
-	}
-	return BAD_APICID;
-}
-
 static int bigsmp_phys_pkg_id(int cpuid_apic, int index_msb)
 {
 	return cpuid_apic >> index_msb;
@@ -177,12 +142,6 @@ static const struct dmi_system_id bigsmp_dmi_table[] = {
 	{ } /* NULL entry stops DMI scanning */
 };
 
-static void bigsmp_vector_allocation_domain(int cpu, struct cpumask *retmask)
-{
-	cpumask_clear(retmask);
-	cpumask_set_cpu(cpu, retmask);
-}
-
 static int probe_bigsmp(void)
 {
 	if (def_to_bigsmp)
@@ -205,13 +164,13 @@ static struct apic apic_bigsmp = {
 	/* phys delivery to target CPU: */
 	.irq_dest_mode			= 0,
 
-	.target_cpus			= bigsmp_target_cpus,
+	.target_cpus			= default_target_cpus,
 	.disable_esr			= 1,
 	.dest_logical			= 0,
 	.check_apicid_used		= bigsmp_check_apicid_used,
 	.check_apicid_present		= bigsmp_check_apicid_present,
 
-	.vector_allocation_domain	= bigsmp_vector_allocation_domain,
+	.vector_allocation_domain	= default_vector_allocation_domain,
 	.init_apic_ldr			= bigsmp_init_apic_ldr,
 
 	.ioapic_phys_id_map		= bigsmp_ioapic_phys_id_map,
@@ -229,8 +188,7 @@ static struct apic apic_bigsmp = {
 	.set_apic_id			= NULL,
 	.apic_id_mask			= 0xFF << 24,
 
-	.cpu_mask_to_apicid		= bigsmp_cpu_mask_to_apicid,
-	.cpu_mask_to_apicid_and		= bigsmp_cpu_mask_to_apicid_and,
+	.cpu_mask_to_apicid_and		= default_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= bigsmp_send_IPI_mask,
 	.send_IPI_mask_allbutself	= NULL,
diff --git a/arch/x86/kernel/apic/es7000_32.c b/arch/x86/kernel/apic/es7000_32.c
index db4ab1b..0874799 100644
--- a/arch/x86/kernel/apic/es7000_32.c
+++ b/arch/x86/kernel/apic/es7000_32.c
@@ -394,21 +394,6 @@ static void es7000_enable_apic_mode(void)
 		WARN(1, "Command failed, status = %x\n", mip_status);
 }
 
-static void es7000_vector_allocation_domain(int cpu, struct cpumask *retmask)
-{
-	/* Careful. Some cpus do not strictly honor the set of cpus
-	 * specified in the interrupt destination when using lowest
-	 * priority interrupt delivery mode.
-	 *
-	 * In particular there was a hyperthreading cpu observed to
-	 * deliver interrupts to the wrong hyperthread when only one
-	 * hyperthread was specified in the interrupt desitination.
-	 */
-	cpumask_clear(retmask);
-	cpumask_bits(retmask)[0] = APIC_ALL_CPUS;
-}
-
-
 static void es7000_wait_for_init_deassert(atomic_t *deassert)
 {
 	while (!atomic_read(deassert))
@@ -540,45 +525,49 @@ static int es7000_check_phys_apicid_present(int cpu_physical_apicid)
 	return 1;
 }
 
-static unsigned int es7000_cpu_mask_to_apicid(const struct cpumask *cpumask)
+static inline int
+es7000_cpu_mask_to_apicid(const struct cpumask *cpumask, unsigned int *dest_id)
 {
 	unsigned int round = 0;
-	int cpu, uninitialized_var(apicid);
+	unsigned int cpu, uninitialized_var(apicid);
 
 	/*
 	 * The cpus in the mask must all be on the apic cluster.
 	 */
-	for_each_cpu(cpu, cpumask) {
+	for_each_cpu_and(cpu, cpumask, cpu_online_mask) {
 		int new_apicid = early_per_cpu(x86_cpu_to_logical_apicid, cpu);
 
 		if (round && APIC_CLUSTER(apicid) != APIC_CLUSTER(new_apicid)) {
 			WARN(1, "Not a valid mask!");
 
-			return BAD_APICID;
+			return -EINVAL;
 		}
-		apicid = new_apicid;
+		apicid |= new_apicid;
 		round++;
 	}
-	return apicid;
+	if (!round)
+		return -EINVAL;
+	*dest_id = apicid;
+	return 0;
 }
 
-static unsigned int
+static int
 es7000_cpu_mask_to_apicid_and(const struct cpumask *inmask,
-			      const struct cpumask *andmask)
+			      const struct cpumask *andmask,
+			      unsigned int *apicid)
 {
-	int apicid = early_per_cpu(x86_cpu_to_logical_apicid, 0);
 	cpumask_var_t cpumask;
+	*apicid = early_per_cpu(x86_cpu_to_logical_apicid, 0);
 
 	if (!alloc_cpumask_var(&cpumask, GFP_ATOMIC))
-		return apicid;
+		return 0;
 
 	cpumask_and(cpumask, inmask, andmask);
-	cpumask_and(cpumask, cpumask, cpu_online_mask);
-	apicid = es7000_cpu_mask_to_apicid(cpumask);
+	es7000_cpu_mask_to_apicid(cpumask, apicid);
 
 	free_cpumask_var(cpumask);
 
-	return apicid;
+	return 0;
 }
 
 static int es7000_phys_pkg_id(int cpuid_apic, int index_msb)
@@ -638,7 +627,7 @@ static struct apic __refdata apic_es7000_cluster = {
 	.check_apicid_used		= es7000_check_apicid_used,
 	.check_apicid_present		= es7000_check_apicid_present,
 
-	.vector_allocation_domain	= es7000_vector_allocation_domain,
+	.vector_allocation_domain	= flat_vector_allocation_domain,
 	.init_apic_ldr			= es7000_init_apic_ldr_cluster,
 
 	.ioapic_phys_id_map		= es7000_ioapic_phys_id_map,
@@ -656,7 +645,6 @@ static struct apic __refdata apic_es7000_cluster = {
 	.set_apic_id			= NULL,
 	.apic_id_mask			= 0xFF << 24,
 
-	.cpu_mask_to_apicid		= es7000_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= es7000_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= es7000_send_IPI_mask,
@@ -705,7 +693,7 @@ static struct apic __refdata apic_es7000 = {
 	.check_apicid_used		= es7000_check_apicid_used,
 	.check_apicid_present		= es7000_check_apicid_present,
 
-	.vector_allocation_domain	= es7000_vector_allocation_domain,
+	.vector_allocation_domain	= flat_vector_allocation_domain,
 	.init_apic_ldr			= es7000_init_apic_ldr,
 
 	.ioapic_phys_id_map		= es7000_ioapic_phys_id_map,
@@ -723,7 +711,6 @@ static struct apic __refdata apic_es7000 = {
 	.set_apic_id			= NULL,
 	.apic_id_mask			= 0xFF << 24,
 
-	.cpu_mask_to_apicid		= es7000_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= es7000_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= es7000_send_IPI_mask,
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index ac96561..9684f96 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -1112,8 +1112,7 @@ __assign_irq_vector(int irq, struct irq_cfg *cfg, const struct cpumask *mask)
 	 * 0x80, because int 0x80 is hm, kind of importantish. ;)
 	 */
 	static int current_vector = FIRST_EXTERNAL_VECTOR + VECTOR_OFFSET_START;
-	static int current_offset = VECTOR_OFFSET_START % 8;
-	unsigned int old_vector;
+	static int current_offset = VECTOR_OFFSET_START % 16;
 	int cpu, err;
 	cpumask_var_t tmp_mask;
 
@@ -1123,35 +1122,45 @@ __assign_irq_vector(int irq, struct irq_cfg *cfg, const struct cpumask *mask)
 	if (!alloc_cpumask_var(&tmp_mask, GFP_ATOMIC))
 		return -ENOMEM;
 
-	old_vector = cfg->vector;
-	if (old_vector) {
-		cpumask_and(tmp_mask, mask, cpu_online_mask);
-		cpumask_and(tmp_mask, cfg->domain, tmp_mask);
-		if (!cpumask_empty(tmp_mask)) {
-			free_cpumask_var(tmp_mask);
-			return 0;
-		}
-	}
-
 	/* Only try and allocate irqs on cpus that are present */
 	err = -ENOSPC;
-	for_each_cpu_and(cpu, mask, cpu_online_mask) {
-		int new_cpu;
-		int vector, offset;
+	cpumask_clear(cfg->old_domain);
+	cpu = cpumask_first_and(mask, cpu_online_mask);
+	while (cpu < nr_cpu_ids) {
+		int new_cpu, vector, offset;
 
-		apic->vector_allocation_domain(cpu, tmp_mask);
+		apic->vector_allocation_domain(cpu, tmp_mask, mask);
+
+		if (cpumask_subset(tmp_mask, cfg->domain)) {
+			err = 0;
+			if (cpumask_equal(tmp_mask, cfg->domain))
+				break;
+			/*
+			 * New cpumask using the vector is a proper subset of
+			 * the current in use mask. So cleanup the vector
+			 * allocation for the members that are not used anymore.
+			 */
+			cpumask_andnot(cfg->old_domain, cfg->domain, tmp_mask);
+			cfg->move_in_progress = 1;
+			cpumask_and(cfg->domain, cfg->domain, tmp_mask);
+			break;
+		}
 
 		vector = current_vector;
 		offset = current_offset;
 next:
-		vector += 8;
+		vector += 16;
 		if (vector >= first_system_vector) {
-			/* If out of vectors on large boxen, must share them. */
-			offset = (offset + 1) % 8;
+			offset = (offset + 1) % 16;
 			vector = FIRST_EXTERNAL_VECTOR + offset;
 		}
-		if (unlikely(current_vector == vector))
+
+		if (unlikely(current_vector == vector)) {
+			cpumask_or(cfg->old_domain, cfg->old_domain, tmp_mask);
+			cpumask_andnot(tmp_mask, mask, cfg->old_domain);
+			cpu = cpumask_first_and(tmp_mask, cpu_online_mask);
 			continue;
+		}
 
 		if (test_bit(vector, used_vectors))
 			goto next;
@@ -1162,7 +1171,7 @@ next:
 		/* Found one! */
 		current_vector = vector;
 		current_offset = offset;
-		if (old_vector) {
+		if (cfg->vector) {
 			cfg->move_in_progress = 1;
 			cpumask_copy(cfg->old_domain, cfg->domain);
 		}
@@ -1346,18 +1355,18 @@ static void setup_ioapic_irq(unsigned int irq, struct irq_cfg *cfg,
 
 	if (!IO_APIC_IRQ(irq))
 		return;
-	/*
-	 * For legacy irqs, cfg->domain starts with cpu 0 for legacy
-	 * controllers like 8259. Now that IO-APIC can handle this irq, update
-	 * the cfg->domain.
-	 */
-	if (irq < legacy_pic->nr_legacy_irqs && cpumask_test_cpu(0, cfg->domain))
-		apic->vector_allocation_domain(0, cfg->domain);
 
 	if (assign_irq_vector(irq, cfg, apic->target_cpus()))
 		return;
 
-	dest = apic->cpu_mask_to_apicid_and(cfg->domain, apic->target_cpus());
+	if (apic->cpu_mask_to_apicid_and(cfg->domain, apic->target_cpus(),
+					 &dest)) {
+		pr_warn("Failed to obtain apicid for ioapic %d, pin %d\n",
+			mpc_ioapic_id(attr->ioapic), attr->ioapic_pin);
+		__clear_irq_vector(irq, cfg);
+
+		return;
+	}
 
 	apic_printk(APIC_VERBOSE,KERN_DEBUG
 		    "IOAPIC[%d]: Set routing entry (%d-%d -> 0x%x -> "
@@ -1366,7 +1375,7 @@ static void setup_ioapic_irq(unsigned int irq, struct irq_cfg *cfg,
 		    cfg->vector, irq, attr->trigger, attr->polarity, dest);
 
 	if (setup_ioapic_entry(irq, &entry, dest, cfg->vector, attr)) {
-		pr_warn("Failed to setup ioapic entry for ioapic  %d, pin %d\n",
+		pr_warn("Failed to setup ioapic entry for ioapic %d, pin %d\n",
 			mpc_ioapic_id(attr->ioapic), attr->ioapic_pin);
 		__clear_irq_vector(irq, cfg);
 
@@ -1469,9 +1478,10 @@ void setup_IO_APIC_irq_extra(u32 gsi)
  * Set up the timer pin, possibly with the 8259A-master behind.
  */
 static void __init setup_timer_IRQ0_pin(unsigned int ioapic_idx,
-					 unsigned int pin, int vector)
+					unsigned int pin, int vector)
 {
 	struct IO_APIC_route_entry entry;
+	unsigned int dest;
 
 	if (irq_remapping_enabled)
 		return;
@@ -1482,9 +1492,13 @@ static void __init setup_timer_IRQ0_pin(unsigned int ioapic_idx,
 	 * We use logical delivery to get the timer IRQ
 	 * to the first CPU.
 	 */
+	if (unlikely(apic->cpu_mask_to_apicid_and(apic->target_cpus(),
+						  apic->target_cpus(), &dest)))
+		dest = BAD_APICID;
+
 	entry.dest_mode = apic->irq_dest_mode;
 	entry.mask = 0;			/* don't mask IRQ for edge */
-	entry.dest = apic->cpu_mask_to_apicid(apic->target_cpus());
+	entry.dest = dest;
 	entry.delivery_mode = apic->irq_delivery_mode;
 	entry.polarity = 0;
 	entry.trigger = 0;
@@ -2210,71 +2224,6 @@ void send_cleanup_vector(struct irq_cfg *cfg)
 	cfg->move_in_progress = 0;
 }
 
-static void __target_IO_APIC_irq(unsigned int irq, unsigned int dest, struct irq_cfg *cfg)
-{
-	int apic, pin;
-	struct irq_pin_list *entry;
-	u8 vector = cfg->vector;
-
-	for_each_irq_pin(entry, cfg->irq_2_pin) {
-		unsigned int reg;
-
-		apic = entry->apic;
-		pin = entry->pin;
-		/*
-		 * With interrupt-remapping, destination information comes
-		 * from interrupt-remapping table entry.
-		 */
-		if (!irq_remapped(cfg))
-			io_apic_write(apic, 0x11 + pin*2, dest);
-		reg = io_apic_read(apic, 0x10 + pin*2);
-		reg &= ~IO_APIC_REDIR_VECTOR_MASK;
-		reg |= vector;
-		io_apic_modify(apic, 0x10 + pin*2, reg);
-	}
-}
-
-/*
- * Either sets data->affinity to a valid value, and returns
- * ->cpu_mask_to_apicid of that in dest_id, or returns -1 and
- * leaves data->affinity untouched.
- */
-int __ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
-			  unsigned int *dest_id)
-{
-	struct irq_cfg *cfg = data->chip_data;
-
-	if (!cpumask_intersects(mask, cpu_online_mask))
-		return -1;
-
-	if (assign_irq_vector(data->irq, data->chip_data, mask))
-		return -1;
-
-	cpumask_copy(data->affinity, mask);
-
-	*dest_id = apic->cpu_mask_to_apicid_and(mask, cfg->domain);
-	return 0;
-}
-
-static int
-ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
-		    bool force)
-{
-	unsigned int dest, irq = data->irq;
-	unsigned long flags;
-	int ret;
-
-	raw_spin_lock_irqsave(&ioapic_lock, flags);
-	ret = __ioapic_set_affinity(data, mask, &dest);
-	if (!ret) {
-		/* Only the high 8 bits are valid. */
-		dest = SET_APIC_LOGICAL_ID(dest);
-		__target_IO_APIC_irq(irq, dest, data->chip_data);
-	}
-	raw_spin_unlock_irqrestore(&ioapic_lock, flags);
-	return ret;
-}
-
 asmlinkage void smp_irq_move_cleanup_interrupt(void)
 {
 	unsigned vector, me;
@@ -2362,6 +2311,87 @@ void irq_force_complete_move(int irq)
 static inline void irq_complete_move(struct irq_cfg *cfg) { }
 #endif
 
+static void __target_IO_APIC_irq(unsigned int irq, unsigned int dest, struct irq_cfg *cfg)
+{
+	int apic, pin;
+	struct irq_pin_list *entry;
+	u8 vector = cfg->vector;
+
+	for_each_irq_pin(entry, cfg->irq_2_pin) {
+		unsigned int reg;
+
+		apic = entry->apic;
+		pin = entry->pin;
+		/*
+		 * With interrupt-remapping, destination information comes
+		 * from interrupt-remapping table entry.
+		 */
+		if (!irq_remapped(cfg))
+			io_apic_write(apic, 0x11 + pin*2, dest);
+		reg = io_apic_read(apic, 0x10 + pin*2);
+		reg &= ~IO_APIC_REDIR_VECTOR_MASK;
+		reg |= vector;
+		io_apic_modify(apic, 0x10 + pin*2, reg);
+	}
+}
+
+/*
+ * Either sets data->affinity to a valid value, and returns
+ * ->cpu_mask_to_apicid of that in dest_id, or returns -1 and
+ * leaves data->affinity untouched.
+ */
+int __ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
+			  unsigned int *dest_id)
+{
+	struct irq_cfg *cfg = data->chip_data;
+	unsigned int irq = data->irq;
+	int err;
+
+	if (!config_enabled(CONFIG_SMP))
+		return -1;
+
+	if (!cpumask_intersects(mask, cpu_online_mask))
+		return -EINVAL;
+
+	err = assign_irq_vector(irq, cfg, mask);
+	if (err)
+		return err;
+
+	err = apic->cpu_mask_to_apicid_and(mask, cfg->domain, dest_id);
+	if (err) {
+		if (assign_irq_vector(irq, cfg, data->affinity))
+			pr_err("Failed to recover vector for irq %d\n", irq);
+		return err;
+	}
+
+	cpumask_copy(data->affinity, mask);
+
+	return 0;
+}
+
+static int
+ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
+		    bool force)
+{
+	unsigned int dest, irq = data->irq;
+	unsigned long flags;
+	int ret;
+
+	if (!config_enabled(CONFIG_SMP))
+		return -1;
+
+	raw_spin_lock_irqsave(&ioapic_lock, flags);
+	ret = __ioapic_set_affinity(data, mask, &dest);
+	if (!ret) {
+		/* Only the high 8 bits are valid. */
+		dest = SET_APIC_LOGICAL_ID(dest);
+		__target_IO_APIC_irq(irq, dest, data->chip_data);
+		ret = IRQ_SET_MASK_OK_NOCOPY;
+	}
+	raw_spin_unlock_irqrestore(&ioapic_lock, flags);
+	return ret;
+}
+
 static void ack_apic_edge(struct irq_data *data)
 {
 	irq_complete_move(data->chip_data);
@@ -2541,9 +2571,7 @@ static void irq_remap_modify_chip_defaults(struct irq_chip *chip)
 	chip->irq_ack = ir_ack_apic_edge;
 	chip->irq_eoi = ir_ack_apic_level;
 
-#ifdef CONFIG_SMP
 	chip->irq_set_affinity = set_remapped_irq_affinity;
-#endif
 }
 #endif /* CONFIG_IRQ_REMAP */
 
@@ -2554,9 +2582,7 @@ static struct irq_chip ioapic_chip __read_mostly = {
 	.irq_unmask		= unmask_ioapic_irq,
 	.irq_ack		= ack_apic_edge,
 	.irq_eoi		= ack_apic_level,
-#ifdef CONFIG_SMP
 	.irq_set_affinity	= ioapic_set_affinity,
-#endif
 	.irq_retrigger		= ioapic_retrigger_irq,
 };
 
@@ -3038,7 +3064,10 @@ static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq,
 	if (err)
 		return err;
 
-	dest = apic->cpu_mask_to_apicid_and(cfg->domain, apic->target_cpus());
+	err = apic->cpu_mask_to_apicid_and(cfg->domain,
+					   apic->target_cpus(), &dest);
+	if (err)
+		return err;
 
 	if (irq_remapped(cfg)) {
 		compose_remapped_msi_msg(pdev, irq, dest, msg, hpet_id);
@@ -3072,7 +3101,6 @@ static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq,
 	return err;
 }
 
-#ifdef CONFIG_SMP
 static int
 msi_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force)
 {
@@ -3092,9 +3120,8 @@ msi_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force)
 
 	__write_msi_msg(data->msi_desc, &msg);
 
-	return 0;
+	return IRQ_SET_MASK_OK_NOCOPY;
 }
-#endif /* CONFIG_SMP */
 
 /*
  * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
@@ -3105,9 +3132,7 @@ static struct irq_chip msi_chip = {
 	.irq_unmask		= unmask_msi_irq,
 	.irq_mask		= mask_msi_irq,
 	.irq_ack		= ack_apic_edge,
-#ifdef CONFIG_SMP
 	.irq_set_affinity	= msi_set_affinity,
-#endif
 	.irq_retrigger		= ioapic_retrigger_irq,
 };
 
@@ -3192,7 +3217,6 @@ void native_teardown_msi_irq(unsigned int irq)
 }
 
 #ifdef CONFIG_DMAR_TABLE
-#ifdef CONFIG_SMP
 static int
 dmar_msi_set_affinity(struct irq_data *data, const struct cpumask *mask,
 		      bool force)
@@ -3214,19 +3238,15 @@ dmar_msi_set_affinity(struct irq_data *data, const struct cpumask *mask,
 
 	dmar_msi_write(irq, &msg);
 
-	return 0;
+	return IRQ_SET_MASK_OK_NOCOPY;
 }
 
-#endif /* CONFIG_SMP */
-
 static struct irq_chip dmar_msi_type = {
 	.name			= "DMAR_MSI",
 	.irq_unmask		= dmar_msi_unmask,
 	.irq_mask		= dmar_msi_mask,
 	.irq_ack		= ack_apic_edge,
-#ifdef CONFIG_SMP
 	.irq_set_affinity	= dmar_msi_set_affinity,
-#endif
 	.irq_retrigger		= ioapic_retrigger_irq,
 };
 
@@ -3247,7 +3267,6 @@ int arch_setup_dmar_msi(unsigned int irq)
 
 #ifdef CONFIG_HPET_TIMER
 
-#ifdef CONFIG_SMP
 static int hpet_msi_set_affinity(struct irq_data *data,
 				 const struct cpumask *mask, bool force)
 {
@@ -3267,19 +3286,15 @@ static int hpet_msi_set_affinity(struct irq_data *data,
 
 	hpet_msi_write(data->handler_data, &msg);
 
-	return 0;
+	return IRQ_SET_MASK_OK_NOCOPY;
 }
 
-#endif /* CONFIG_SMP */
-
 static struct irq_chip hpet_msi_type = {
 	.name = "HPET_MSI",
 	.irq_unmask = hpet_msi_unmask,
 	.irq_mask = hpet_msi_mask,
 	.irq_ack = ack_apic_edge,
-#ifdef CONFIG_SMP
 	.irq_set_affinity = hpet_msi_set_affinity,
-#endif
 	.irq_retrigger = ioapic_retrigger_irq,
 };
 
@@ -3314,8 +3329,6 @@ int arch_setup_hpet_msi(unsigned int irq, unsigned int id)
  */
 #ifdef CONFIG_HT_IRQ
 
-#ifdef CONFIG_SMP
-
 static void target_ht_irq(unsigned int irq, unsigned int dest, u8 vector)
 {
 	struct ht_irq_msg msg;
@@ -3340,25 +3353,23 @@ ht_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force)
 		return -1;
 
 	target_ht_irq(data->irq, dest, cfg->vector);
-	return 0;
+	return IRQ_SET_MASK_OK_NOCOPY;
 }
 
-#endif
-
 static struct irq_chip ht_irq_chip = {
 	.name			= "PCI-HT",
 	.irq_mask		= mask_ht_irq,
 	.irq_unmask		= unmask_ht_irq,
 	.irq_ack		= ack_apic_edge,
-#ifdef CONFIG_SMP
 	.irq_set_affinity	= ht_set_affinity,
-#endif
 	.irq_retrigger		= ioapic_retrigger_irq,
 };
 
 int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
 {
 	struct irq_cfg *cfg;
+	struct ht_irq_msg msg;
+	unsigned dest;
 	int err;
 
 	if (disable_apic)
@@ -3366,36 +3377,37 @@ int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
 
 	cfg = irq_cfg(irq);
 	err = assign_irq_vector(irq, cfg, apic->target_cpus());
-	if (!err) {
-		struct ht_irq_msg msg;
-		unsigned dest;
+	if (err)
+		return err;
+
+	err = apic->cpu_mask_to_apicid_and(cfg->domain,
+					   apic->target_cpus(), &dest);
+	if (err)
+		return err;
 
-		dest = apic->cpu_mask_to_apicid_and(cfg->domain,
-						    apic->target_cpus());
+	msg.address_hi = HT_IRQ_HIGH_DEST_ID(dest);
 
-		msg.address_hi = HT_IRQ_HIGH_DEST_ID(dest);
+	msg.address_lo =
+		HT_IRQ_LOW_BASE |
+		HT_IRQ_LOW_DEST_ID(dest) |
+		HT_IRQ_LOW_VECTOR(cfg->vector) |
+		((apic->irq_dest_mode == 0) ?
+			HT_IRQ_LOW_DM_PHYSICAL :
+			HT_IRQ_LOW_DM_LOGICAL) |
+		HT_IRQ_LOW_RQEOI_EDGE |
+		((apic->irq_delivery_mode != dest_LowestPrio) ?
+			HT_IRQ_LOW_MT_FIXED :
+			HT_IRQ_LOW_MT_ARBITRATED) |
+		HT_IRQ_LOW_IRQ_MASKED;
 
-		msg.address_lo =
-			HT_IRQ_LOW_BASE |
-			HT_IRQ_LOW_DEST_ID(dest) |
-			HT_IRQ_LOW_VECTOR(cfg->vector) |
-			((apic->irq_dest_mode == 0) ?
-				HT_IRQ_LOW_DM_PHYSICAL :
-				HT_IRQ_LOW_DM_LOGICAL) |
-			HT_IRQ_LOW_RQEOI_EDGE |
-			((apic->irq_delivery_mode != dest_LowestPrio) ?
-				HT_IRQ_LOW_MT_FIXED :
-				HT_IRQ_LOW_MT_ARBITRATED) |
-			HT_IRQ_LOW_IRQ_MASKED;
+	write_ht_irq_msg(irq, &msg);
 
-		write_ht_irq_msg(irq, &msg);
+	irq_set_chip_and_handler_name(irq, &ht_irq_chip,
+				      handle_edge_irq, "edge");
 
-		irq_set_chip_and_handler_name(irq, &ht_irq_chip,
-					      handle_edge_irq, "edge");
+	dev_printk(KERN_DEBUG, &dev->dev, "irq %d for HT\n", irq);
 
-		dev_printk(KERN_DEBUG, &dev->dev, "irq %d for HT\n", irq);
-	}
-	return err;
+	return 0;
 }
 #endif /* CONFIG_HT_IRQ */
 
diff --git a/arch/x86/kernel/apic/numaq_32.c b/arch/x86/kernel/apic/numaq_32.c
index f00a68c..d661ee9 100644
--- a/arch/x86/kernel/apic/numaq_32.c
+++ b/arch/x86/kernel/apic/numaq_32.c
@@ -406,16 +406,13 @@ static inline int numaq_check_phys_apicid_present(int phys_apicid)
  * We use physical apicids here, not logical, so just return the default
  * physical broadcast to stop people from breaking us
  */
-static unsigned int numaq_cpu_mask_to_apicid(const struct cpumask *cpumask)
-{
-	return 0x0F;
-}
-
-static inline unsigned int
+static int
 numaq_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
-			     const struct cpumask *andmask)
+			     const struct cpumask *andmask,
+			     unsigned int *apicid)
 {
-	return 0x0F;
+	*apicid = 0x0F;
+	return 0;
 }
 
 /* No NUMA-Q box has a HT CPU, but it can't hurt to use the default code. */
@@ -441,20 +438,6 @@ static int probe_numaq(void)
 	return found_numaq;
 }
 
-static void numaq_vector_allocation_domain(int cpu, struct cpumask *retmask)
-{
-	/* Careful. Some cpus do not strictly honor the set of cpus
-	 * specified in the interrupt destination when using lowest
-	 * priority interrupt delivery mode.
-	 *
-	 * In particular there was a hyperthreading cpu observed to
-	 * deliver interrupts to the wrong hyperthread when only one
-	 * hyperthread was specified in the interrupt desitination.
-	 */
-	cpumask_clear(retmask);
-	cpumask_bits(retmask)[0] = APIC_ALL_CPUS;
-}
-
 static void numaq_setup_portio_remap(void)
 {
 	int num_quads = num_online_nodes();
@@ -491,7 +474,7 @@ static struct apic __refdata apic_numaq = {
 	.check_apicid_used		= numaq_check_apicid_used,
 	.check_apicid_present		= numaq_check_apicid_present,
 
-	.vector_allocation_domain	= numaq_vector_allocation_domain,
+	.vector_allocation_domain	= flat_vector_allocation_domain,
 	.init_apic_ldr			= numaq_init_apic_ldr,
 
 	.ioapic_phys_id_map		= numaq_ioapic_phys_id_map,
@@ -509,7 +492,6 @@ static struct apic __refdata apic_numaq = {
 	.set_apic_id			= NULL,
 	.apic_id_mask			= 0x0F << 24,
 
-	.cpu_mask_to_apicid		= numaq_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= numaq_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= numaq_send_IPI_mask,
diff --git a/arch/x86/kernel/apic/probe_32.c b/arch/x86/kernel/apic/probe_32.c
index 1b291da..eb35ef9 100644
--- a/arch/x86/kernel/apic/probe_32.c
+++ b/arch/x86/kernel/apic/probe_32.c
@@ -66,21 +66,6 @@ static void setup_apic_flat_routing(void)
 #endif
 }
 
-static void default_vector_allocation_domain(int cpu, struct cpumask *retmask)
-{
-	/*
-	 * Careful. Some cpus do not strictly honor the set of cpus
-	 * specified in the interrupt destination when using lowest
-	 * priority interrupt delivery mode.
-	 *
-	 * In particular there was a hyperthreading cpu observed to
-	 * deliver interrupts to the wrong hyperthread when only one
-	 * hyperthread was specified in the interrupt desitination.
-	 */
-	cpumask_clear(retmask);
-	cpumask_bits(retmask)[0] = APIC_ALL_CPUS;
-}
-
 /* should be called last. */
 static int probe_default(void)
 {
@@ -105,7 +90,7 @@ static struct apic apic_default = {
 	.check_apicid_used		= default_check_apicid_used,
 	.check_apicid_present		= default_check_apicid_present,
 
-	.vector_allocation_domain	= default_vector_allocation_domain,
+	.vector_allocation_domain	= flat_vector_allocation_domain,
 	.init_apic_ldr			= default_init_apic_ldr,
 
 	.ioapic_phys_id_map		= default_ioapic_phys_id_map,
@@ -123,8 +108,7 @@ static struct apic apic_default = {
 	.set_apic_id			= NULL,
 	.apic_id_mask			= 0x0F << 24,
 
-	.cpu_mask_to_apicid		= default_cpu_mask_to_apicid,
-	.cpu_mask_to_apicid_and		= default_cpu_mask_to_apicid_and,
+	.cpu_mask_to_apicid_and		= flat_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= default_send_IPI_mask_logical,
 	.send_IPI_mask_allbutself	= default_send_IPI_mask_allbutself_logical,
@@ -208,6 +192,9 @@ void __init default_setup_apic_routing(void)
 
 	if (apic->setup_apic_routing)
 		apic->setup_apic_routing();
+
+	if (x86_platform.apic_post_init)
+		x86_platform.apic_post_init();
 }
 
 void __init generic_apic_probe(void)
diff --git a/arch/x86/kernel/apic/probe_64.c b/arch/x86/kernel/apic/probe_64.c
index 3fe9866..1793dba 100644
--- a/arch/x86/kernel/apic/probe_64.c
+++ b/arch/x86/kernel/apic/probe_64.c
@@ -23,11 +23,6 @@
 #include <asm/ipi.h>
 #include <asm/setup.h>
 
-static int apicid_phys_pkg_id(int initial_apic_id, int index_msb)
-{
-	return hard_smp_processor_id() >> index_msb;
-}
-
 /*
  * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
  */
@@ -48,10 +43,8 @@ void __init default_setup_apic_routing(void)
 		}
 	}
 
-	if (is_vsmp_box()) {
-		/* need to update phys_pkg_id */
-		apic->phys_pkg_id = apicid_phys_pkg_id;
-	}
+	if (x86_platform.apic_post_init)
+		x86_platform.apic_post_init();
 }
 
 /* Same for both flat and physical. */
diff --git a/arch/x86/kernel/apic/summit_32.c b/arch/x86/kernel/apic/summit_32.c
index 659897c..b6e6185 100644
--- a/arch/x86/kernel/apic/summit_32.c
+++ b/arch/x86/kernel/apic/summit_32.c
@@ -263,43 +263,48 @@ static int summit_check_phys_apicid_present(int physical_apicid)
 	return 1;
 }
 
-static unsigned int summit_cpu_mask_to_apicid(const struct cpumask *cpumask)
+static inline int
+summit_cpu_mask_to_apicid(const struct cpumask *cpumask, unsigned int *dest_id)
 {
 	unsigned int round = 0;
-	int cpu, apicid = 0;
+	unsigned int cpu, apicid = 0;
 
 	/*
 	 * The cpus in the mask must all be on the apic cluster.
 	 */
-	for_each_cpu(cpu, cpumask) {
+	for_each_cpu_and(cpu, cpumask, cpu_online_mask) {
 		int new_apicid = early_per_cpu(x86_cpu_to_logical_apicid, cpu);
 
 		if (round && APIC_CLUSTER(apicid) != APIC_CLUSTER(new_apicid)) {
 			printk("%s: Not a valid mask!\n", __func__);
-			return BAD_APICID;
+			return -EINVAL;
 		}
 		apicid |= new_apicid;
 		round++;
 	}
-	return apicid;
+	if (!round)
+		return -EINVAL;
+	*dest_id = apicid;
+	return 0;
 }
 
-static unsigned int summit_cpu_mask_to_apicid_and(const struct cpumask *inmask,
-			      const struct cpumask *andmask)
+static int
+summit_cpu_mask_to_apicid_and(const struct cpumask *inmask,
+			      const struct cpumask *andmask,
+			      unsigned int *apicid)
 {
-	int apicid = early_per_cpu(x86_cpu_to_logical_apicid, 0);
 	cpumask_var_t cpumask;
+	*apicid = early_per_cpu(x86_cpu_to_logical_apicid, 0);
 
 	if (!alloc_cpumask_var(&cpumask, GFP_ATOMIC))
-		return apicid;
+		return 0;
 
 	cpumask_and(cpumask, inmask, andmask);
-	cpumask_and(cpumask, cpumask, cpu_online_mask);
-	apicid = summit_cpu_mask_to_apicid(cpumask);
+	summit_cpu_mask_to_apicid(cpumask, apicid);
 
 	free_cpumask_var(cpumask);
 
-	return apicid;
+	return 0;
 }
 
 /*
@@ -320,20 +325,6 @@ static int probe_summit(void)
 	return 0;
 }
 
-static void summit_vector_allocation_domain(int cpu, struct cpumask *retmask)
-{
-	/* Careful. Some cpus do not strictly honor the set of cpus
-	 * specified in the interrupt destination when using lowest
-	 * priority interrupt delivery mode.
-	 *
-	 * In particular there was a hyperthreading cpu observed to
-	 * deliver interrupts to the wrong hyperthread when only one
-	 * hyperthread was specified in the interrupt desitination.
-	 */
-	cpumask_clear(retmask);
-	cpumask_bits(retmask)[0] = APIC_ALL_CPUS;
-}
-
 #ifdef CONFIG_X86_SUMMIT_NUMA
 static struct rio_table_hdr *rio_table_hdr;
 static struct scal_detail   *scal_devs[MAX_NUMNODES];
@@ -509,7 +500,7 @@ static struct apic apic_summit = {
 	.check_apicid_used		= summit_check_apicid_used,
 	.check_apicid_present		= summit_check_apicid_present,
 
-	.vector_allocation_domain	= summit_vector_allocation_domain,
+	.vector_allocation_domain	= flat_vector_allocation_domain,
 	.init_apic_ldr			= summit_init_apic_ldr,
 
 	.ioapic_phys_id_map		= summit_ioapic_phys_id_map,
@@ -527,7 +518,6 @@ static struct apic apic_summit = {
 	.set_apic_id			= NULL,
 	.apic_id_mask			= 0xFF << 24,
 
-	.cpu_mask_to_apicid		= summit_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= summit_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= summit_send_IPI_mask,
diff --git a/arch/x86/kernel/apic/x2apic_cluster.c b/arch/x86/kernel/apic/x2apic_cluster.c
index ff35cff..c88baa4 100644
--- a/arch/x86/kernel/apic/x2apic_cluster.c
+++ b/arch/x86/kernel/apic/x2apic_cluster.c
@@ -81,7 +81,7 @@ static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector)
 }
 
 static void
- x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
+x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
 {
 	__x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLBUT);
 }
@@ -96,36 +96,37 @@ static void x2apic_send_IPI_all(int vector)
 	__x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLINC);
 }
 
-static unsigned int x2apic_cpu_mask_to_apicid(const struct cpumask *cpumask)
+static int
+x2apic_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
+			      const struct cpumask *andmask,
+			      unsigned int *apicid)
 {
-	/*
-	 * We're using fixed IRQ delivery, can only return one logical APIC ID.
-	 * May as well be the first.
-	 */
-	int cpu = cpumask_first(cpumask);
+	u32 dest = 0;
+	u16 cluster;
+	int i;
 
-	if ((unsigned)cpu < nr_cpu_ids)
-		return per_cpu(x86_cpu_to_logical_apicid, cpu);
-	else
-		return BAD_APICID;
-}
+	for_each_cpu_and(i, cpumask, andmask) {
+		if (!cpumask_test_cpu(i, cpu_online_mask))
+			continue;
+		dest = per_cpu(x86_cpu_to_logical_apicid, i);
+		cluster = x2apic_cluster(i);
+		break;
+	}
 
-static unsigned int
-x2apic_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
-			      const struct cpumask *andmask)
-{
-	int cpu;
+	if (!dest)
+		return -EINVAL;
 
-	/*
-	 * We're using fixed IRQ delivery, can only return one logical APIC ID.
-	 * May as well be the first.
-	 */
-	for_each_cpu_and(cpu, cpumask, andmask) {
-		if (cpumask_test_cpu(cpu, cpu_online_mask))
-			break;
+	for_each_cpu_and(i, cpumask, andmask) {
+		if (!cpumask_test_cpu(i, cpu_online_mask))
+			continue;
+		if (cluster != x2apic_cluster(i))
+			continue;
+		dest |= per_cpu(x86_cpu_to_logical_apicid, i);
 	}
 
-	return per_cpu(x86_cpu_to_logical_apicid, cpu);
+	*apicid = dest;
+
+	return 0;
 }
 
 static void init_x2apic_ldr(void)
@@ -208,6 +209,32 @@ static int x2apic_cluster_probe(void)
 		return 0;
 }
 
+static const struct cpumask *x2apic_cluster_target_cpus(void)
+{
+	return cpu_all_mask;
+}
+
+/*
+ * Each x2apic cluster is an allocation domain.
+ */
+static void cluster_vector_allocation_domain(int cpu, struct cpumask *retmask,
+					     const struct cpumask *mask)
+{
+	/*
+	 * To minimize vector pressure, default case of boot, device bringup
+	 * etc will use a single cpu for the interrupt destination.
+	 *
+	 * On explicit migration requests coming from irqbalance etc,
+	 * interrupts will be routed to the x2apic cluster (cluster-id
+	 * derived from the first cpu in the mask) members specified
+	 * in the mask.
+	 */
+	if (mask == x2apic_cluster_target_cpus())
+		cpumask_copy(retmask, cpumask_of(cpu));
+	else
+		cpumask_and(retmask, mask, per_cpu(cpus_in_cluster, cpu));
+}
+
 static struct apic apic_x2apic_cluster = {
 
 	.name				= "cluster x2apic",
@@ -219,13 +246,13 @@ static struct apic apic_x2apic_cluster = {
 	.irq_delivery_mode		= dest_LowestPrio,
 	.irq_dest_mode			= 1, /* logical */
 
-	.target_cpus			= x2apic_target_cpus,
+	.target_cpus			= x2apic_cluster_target_cpus,
 	.disable_esr			= 0,
 	.dest_logical			= APIC_DEST_LOGICAL,
 	.check_apicid_used		= NULL,
 	.check_apicid_present		= NULL,
 
-	.vector_allocation_domain	= x2apic_vector_allocation_domain,
+	.vector_allocation_domain	= cluster_vector_allocation_domain,
 	.init_apic_ldr			= init_x2apic_ldr,
 
 	.ioapic_phys_id_map		= NULL,
@@ -243,7 +270,6 @@ static struct apic apic_x2apic_cluster = {
 	.set_apic_id			= x2apic_set_apic_id,
 	.apic_id_mask			= 0xFFFFFFFFu,
 
-	.cpu_mask_to_apicid		= x2apic_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= x2apic_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= x2apic_send_IPI_mask,
diff --git a/arch/x86/kernel/apic/x2apic_phys.c b/arch/x86/kernel/apic/x2apic_phys.c
index c17e982..e03a1e1 100644
--- a/arch/x86/kernel/apic/x2apic_phys.c
+++ b/arch/x86/kernel/apic/x2apic_phys.c
@@ -76,38 +76,6 @@ static void x2apic_send_IPI_all(int vector)
 	__x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLINC);
 }
 
-static unsigned int x2apic_cpu_mask_to_apicid(const struct cpumask *cpumask)
-{
-	/*
-	 * We're using fixed IRQ delivery, can only return one phys APIC ID.
-	 * May as well be the first.
-	 */
-	int cpu = cpumask_first(cpumask);
-
-	if ((unsigned)cpu < nr_cpu_ids)
-		return per_cpu(x86_cpu_to_apicid, cpu);
-	else
-		return BAD_APICID;
-}
-
-static unsigned int
-x2apic_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
-			      const struct cpumask *andmask)
-{
-	int cpu;
-
-	/*
-	 * We're using fixed IRQ delivery, can only return one phys APIC ID.
-	 * May as well be the first.
-	 */
-	for_each_cpu_and(cpu, cpumask, andmask) {
-		if (cpumask_test_cpu(cpu, cpu_online_mask))
-			break;
-	}
-
-	return per_cpu(x86_cpu_to_apicid, cpu);
-}
-
 static void init_x2apic_ldr(void)
 {
 }
@@ -131,13 +99,13 @@ static struct apic apic_x2apic_phys = {
 	.irq_delivery_mode		= dest_Fixed,
 	.irq_dest_mode			= 0, /* physical */
 
-	.target_cpus			= x2apic_target_cpus,
+	.target_cpus			= online_target_cpus,
 	.disable_esr			= 0,
 	.dest_logical			= 0,
 	.check_apicid_used		= NULL,
 	.check_apicid_present		= NULL,
 
-	.vector_allocation_domain	= x2apic_vector_allocation_domain,
+	.vector_allocation_domain	= default_vector_allocation_domain,
 	.init_apic_ldr			= init_x2apic_ldr,
 
 	.ioapic_phys_id_map		= NULL,
@@ -155,8 +123,7 @@ static struct apic apic_x2apic_phys = {
 	.set_apic_id			= x2apic_set_apic_id,
 	.apic_id_mask			= 0xFFFFFFFFu,
 
-	.cpu_mask_to_apicid		= x2apic_cpu_mask_to_apicid,
-	.cpu_mask_to_apicid_and		= x2apic_cpu_mask_to_apicid_and,
+	.cpu_mask_to_apicid_and		= default_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= x2apic_send_IPI_mask,
 	.send_IPI_mask_allbutself	= x2apic_send_IPI_mask_allbutself,
diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index c6d03f7..8cfade9 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -185,17 +185,6 @@ EXPORT_SYMBOL_GPL(uv_possible_blades);
 unsigned long sn_rtc_cycles_per_second;
 EXPORT_SYMBOL(sn_rtc_cycles_per_second);
 
-static const struct cpumask *uv_target_cpus(void)
-{
-	return cpu_online_mask;
-}
-
-static void uv_vector_allocation_domain(int cpu, struct cpumask *retmask)
-{
-	cpumask_clear(retmask);
-	cpumask_set_cpu(cpu, retmask);
-}
-
 static int __cpuinit uv_wakeup_secondary(int phys_apicid, unsigned long start_rip)
 {
 #ifdef CONFIG_SMP
@@ -280,25 +269,12 @@ static void uv_init_apic_ldr(void)
 {
 }
 
-static unsigned int uv_cpu_mask_to_apicid(const struct cpumask *cpumask)
-{
-	/*
-	 * We're using fixed IRQ delivery, can only return one phys APIC ID.
-	 * May as well be the first.
-	 */
-	int cpu = cpumask_first(cpumask);
-
-	if ((unsigned)cpu < nr_cpu_ids)
-		return per_cpu(x86_cpu_to_apicid, cpu) | uv_apicid_hibits;
-	else
-		return BAD_APICID;
-}
-
-static unsigned int
+static int
 uv_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
-			  const struct cpumask *andmask)
+			  const struct cpumask *andmask,
+			  unsigned int *apicid)
 {
-	int cpu;
+	int unsigned cpu;
 
 	/*
 	 * We're using fixed IRQ delivery, can only return one phys APIC ID.
@@ -308,7 +284,13 @@ uv_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 		if (cpumask_test_cpu(cpu, cpu_online_mask))
 			break;
 	}
-	return per_cpu(x86_cpu_to_apicid, cpu) | uv_apicid_hibits;
+
+	if (likely(cpu < nr_cpu_ids)) {
+		*apicid = per_cpu(x86_cpu_to_apicid, cpu) | uv_apicid_hibits;
+		return 0;
+	}
+
+	return -EINVAL;
 }
 
 static unsigned int x2apic_get_apic_id(unsigned long x)
@@ -362,13 +344,13 @@ static struct apic __refdata apic_x2apic_uv_x = {
 	.irq_delivery_mode		= dest_Fixed,
 	.irq_dest_mode			= 0, /* physical */
 
-	.target_cpus			= uv_target_cpus,
+	.target_cpus			= online_target_cpus,
 	.disable_esr			= 0,
 	.dest_logical			= APIC_DEST_LOGICAL,
 	.check_apicid_used		= NULL,
 	.check_apicid_present		= NULL,
 
-	.vector_allocation_domain	= uv_vector_allocation_domain,
+	.vector_allocation_domain	= default_vector_allocation_domain,
 	.init_apic_ldr			= uv_init_apic_ldr,
 
 	.ioapic_phys_id_map		= NULL,
@@ -386,7 +368,6 @@ static struct apic __refdata apic_x2apic_uv_x = {
 	.set_apic_id			= set_apic_id,
 	.apic_id_mask			= 0xFFFFFFFFu,
 
-	.cpu_mask_to_apicid		= uv_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= uv_cpu_mask_to_apicid_and,
 
 	.send_IPI_mask			= uv_send_IPI_mask,
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 16be6dc..f4b9b80 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -1031,8 +1031,6 @@ void __init setup_arch(char **cmdline_p)
 
 	x86_init.timers.wallclock_init();
 
-	x86_platform.wallclock_init();
-
 	mcheck_init();
 
 	arch_init_ideal_nops();
diff --git a/arch/x86/kernel/vsmp_64.c b/arch/x86/kernel/vsmp_64.c
index 8eeb55a..992f890 100644
--- a/arch/x86/kernel/vsmp_64.c
+++ b/arch/x86/kernel/vsmp_64.c
@@ -16,6 +16,7 @@
 #include <linux/pci_ids.h>
 #include <linux/pci_regs.h>
 #include <linux/smp.h>
+#include <linux/irq.h>
 
 #include <asm/apic.h>
 #include <asm/pci-direct.h>
@@ -95,6 +96,18 @@ static void __init set_vsmp_pv_ops(void)
 	ctl = readl(address + 4);
 	printk(KERN_INFO "vSMP CTL: capabilities:0x%08x  control:0x%08x\n",
 	       cap, ctl);
+
+	/* If possible, let the vSMP foundation route the interrupt optimally */
+#ifdef CONFIG_SMP
+	if (cap & ctl & BIT(8)) {
+		ctl &= ~BIT(8);
+#ifdef CONFIG_PROC_FS
+		/* Don't let users change irq affinity via procfs */
+		no_irq_affinity = 1;
+#endif
+	}
+#endif
+
 	if (cap & ctl & (1 << 4)) {
 		/* Setup irq ops and turn on vSMP  IRQ fastpath handling */
 		pv_irq_ops.irq_disable = PV_CALLEE_SAVE(vsmp_irq_disable);
@@ -102,12 +115,11 @@ static void __init set_vsmp_pv_ops(void)
 		pv_irq_ops.save_fl  = PV_CALLEE_SAVE(vsmp_save_fl);
 		pv_irq_ops.restore_fl  = PV_CALLEE_SAVE(vsmp_restore_fl);
 		pv_init_ops.patch = vsmp_patch;
-
 		ctl &= ~(1 << 4);
-		writel(ctl, address + 4);
-		ctl = readl(address + 4);
-		printk(KERN_INFO "vSMP CTL: control set to:0x%08x\n", ctl);
 	}
+	writel(ctl, address + 4);
+	ctl = readl(address + 4);
+	pr_info("vSMP CTL: control set to:0x%08x\n", ctl);
 
 	early_iounmap(address, 8);
 }
@@ -187,12 +199,36 @@ static void __init vsmp_cap_cpus(void)
 #endif
 }
 
+static int apicid_phys_pkg_id(int initial_apic_id, int index_msb)
+{
+	return hard_smp_processor_id() >> index_msb;
+}
+
+/*
+ * In vSMP, all cpus should be capable of handling interrupts, regardless of
+ * the APIC used.
+ */
+static void fill_vector_allocation_domain(int cpu, struct cpumask *retmask,
+					  const struct cpumask *mask)
+{
+	cpumask_setall(retmask);
+}
+
+static void vsmp_apic_post_init(void)
+{
+	/* need to update phys_pkg_id */
+	apic->phys_pkg_id = apicid_phys_pkg_id;
+	apic->vector_allocation_domain = fill_vector_allocation_domain;
+}
+
 void __init vsmp_init(void)
 {
 	detect_vsmp_box();
 	if (!is_vsmp_box())
 		return;
 
+	x86_platform.apic_post_init = vsmp_apic_post_init;
+
 	vsmp_cap_cpus();
 
 	set_vsmp_pv_ops();
diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index 35c5e54..9f3167e 100644
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -29,7 +29,6 @@ void __init x86_init_uint_noop(unsigned int unused) { }
 void __init x86_init_pgd_noop(pgd_t *unused) { }
 int __init iommu_init_noop(void) { return 0; }
 void iommu_shutdown_noop(void) { }
-void wallclock_init_noop(void) { }
 
 /*
  * The platform setup functions are preset with the default functions
@@ -101,7 +100,6 @@ static int default_i8042_detect(void) { return 1; };
 
 struct x86_platform_ops x86_platform = {
 	.calibrate_tsc			= native_calibrate_tsc,
-	.wallclock_init			= wallclock_init_noop,
 	.get_wallclock			= mach_get_cmos_time,
 	.set_wallclock			= mach_set_rtc_mmss,
 	.iommu_shutdown			= iommu_shutdown_noop,
diff --git a/arch/x86/platform/uv/uv_irq.c b/arch/x86/platform/uv/uv_irq.c
index f25c276..acf7752 100644
--- a/arch/x86/platform/uv/uv_irq.c
+++ b/arch/x86/platform/uv/uv_irq.c
@@ -135,6 +135,7 @@ arch_enable_uv_irq(char *irq_name, unsigned int irq, int cpu, int mmr_blade,
 	unsigned long mmr_value;
 	struct uv_IO_APIC_route_entry *entry;
 	int mmr_pnode, err;
+	unsigned int dest;
 
 	BUILD_BUG_ON(sizeof(struct uv_IO_APIC_route_entry) !=
 			sizeof(unsigned long));
@@ -143,6 +144,10 @@ arch_enable_uv_irq(char *irq_name, unsigned int irq, int cpu, int mmr_blade,
 	if (err != 0)
 		return err;
 
+	err = apic->cpu_mask_to_apicid_and(eligible_cpu, eligible_cpu, &dest);
+	if (err != 0)
+		return err;
+
 	if (limit == UV_AFFINITY_CPU)
 		irq_set_status_flags(irq, IRQ_NO_BALANCING);
 	else
@@ -159,7 +164,7 @@ arch_enable_uv_irq(char *irq_name, unsigned int irq, int cpu, int mmr_blade,
 	entry->polarity		= 0;
 	entry->trigger		= 0;
 	entry->mask		= 0;
-	entry->dest		= apic->cpu_mask_to_apicid(eligible_cpu);
+	entry->dest		= dest;
 
 	mmr_pnode = uv_blade_to_pnode(mmr_blade);
 	uv_write_global_mmr64(mmr_pnode, mmr_offset, mmr_value);
@@ -222,7 +227,7 @@ uv_set_irq_affinity(struct irq_data *data, const struct cpumask *mask,
 	if (cfg->move_in_progress)
 		send_cleanup_vector(cfg);
 
-	return 0;
+	return IRQ_SET_MASK_OK_NOCOPY;
 }
 
 /*
diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c
index 6d34706..e0b18f3 100644
--- a/drivers/iommu/intel_irq_remapping.c
+++ b/drivers/iommu/intel_irq_remapping.c
@@ -902,7 +902,6 @@ static int intel_setup_ioapic_entry(int irq,
 	return 0;
 }
 
-#ifdef CONFIG_SMP
 /*
  * Migrate the IO-APIC irq in the presence of intr-remapping.
  *
@@ -924,6 +923,10 @@ intel_ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
 	struct irq_cfg *cfg = data->chip_data;
 	unsigned int dest, irq = data->irq;
 	struct irte irte;
+	int err;
+
+	if (!config_enabled(CONFIG_SMP))
+		return -EINVAL;
 
 	if (!cpumask_intersects(mask, cpu_online_mask))
 		return -EINVAL;
@@ -931,10 +934,16 @@ intel_ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
 	if (get_irte(irq, &irte))
 		return -EBUSY;
 
-	if (assign_irq_vector(irq, cfg, mask))
-		return -EBUSY;
+	err = assign_irq_vector(irq, cfg, mask);
+	if (err)
+		return err;
 
-	dest = apic->cpu_mask_to_apicid_and(cfg->domain, mask);
+	err = apic->cpu_mask_to_apicid_and(cfg->domain, mask, &dest);
+	if (err) {
+		if (assign_irq_vector(irq, cfg, data->affinity))
+			pr_err("Failed to recover vector for irq %d\n", irq);
+		return err;
+	}
 
 	irte.vector = cfg->vector;
 	irte.dest_id = IRTE_DEST(dest);
@@ -956,7 +965,6 @@ intel_ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
 	cpumask_copy(data->affinity, mask);
 	return 0;
 }
-#endif
 
 static void intel_compose_msi_msg(struct pci_dev *pdev,
 				  unsigned int irq, unsigned int dest,
@@ -1058,9 +1066,7 @@ struct irq_remap_ops intel_irq_remap_ops = {
 	.reenable		= reenable_irq_remapping,
 	.enable_faulting	= enable_drhd_fault_handling,
 	.setup_ioapic_entry	= intel_setup_ioapic_entry,
-#ifdef CONFIG_SMP
 	.set_affinity		= intel_ioapic_set_affinity,
-#endif
 	.free_irq		= free_irte,
 	.compose_msi_msg	= intel_compose_msi_msg,
 	.msi_alloc_irq		= intel_msi_alloc_irq,
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index 40cda8e..1d29b1c 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -111,16 +111,15 @@ int setup_ioapic_remapped_entry(int irq,
 					     vector, attr);
 }
 
-#ifdef CONFIG_SMP
 int set_remapped_irq_affinity(struct irq_data *data, const struct cpumask *mask,
 			      bool force)
 {
-	if (!remap_ops || !remap_ops->set_affinity)
+	if (!config_enabled(CONFIG_SMP) || !remap_ops ||
+	    !remap_ops->set_affinity)
 		return 0;
 
 	return remap_ops->set_affinity(data, mask, force);
 }
-#endif
 
 void free_remapped_irq(int irq)
 {
diff --git a/drivers/iommu/irq_remapping.h b/drivers/iommu/irq_remapping.h
index be9d729..b12974c 100644
--- a/drivers/iommu/irq_remapping.h
+++ b/drivers/iommu/irq_remapping.h
@@ -59,11 +59,9 @@ struct irq_remap_ops {
 				  unsigned int, int,
 				  struct io_apic_irq_attr *);
 
-#ifdef CONFIG_SMP
 	/* Set the CPU affinity of a remapped interrupt */
 	int (*set_affinity)(struct irq_data *data, const struct cpumask *mask,
 			    bool force);
-#endif
 
 	/* Free an IRQ */
 	int (*free_irq)(int);
diff --git a/include/linux/irq.h b/include/linux/irq.h
index 61f5cec..47a937c 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -150,9 +150,7 @@ struct irq_data {
 	void			*handler_data;
 	void			*chip_data;
 	struct msi_desc		*msi_desc;
-#ifdef CONFIG_SMP
 	cpumask_var_t		affinity;
-#endif
 };
 
 /*