irq/apic: Use config_enabled(CONFIG_SMP) checks to clean up irq_set_affinity() for UP

Move the ->irq_set_affinity() routines out of the #ifdef CONFIG_SMP
sections and use config_enabled(CONFIG_SMP) checks inside those
routines. Thus making those routines simple null stubs for
!CONFIG_SMP and retaining those routines with no additional
runtime overhead for CONFIG_SMP kernels.

Cleans up the ifdef CONFIG_SMP in and around routines related to
irq_set_affinity in io_apic and irq_remapping subsystems.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: torvalds@linux-foundation.org
Cc: joerg.roedel@amd.com
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Link: http://lkml.kernel.org/r/1339723729.3475.63.camel@sbsiddha-desk.sc.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 7cbd397..a951ef7 100644 (file)
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -2224,81 +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;
-       unsigned int irq = data->irq;
-       int err;
-
-       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;
-
-       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;
-}
-
 asmlinkage void smp_irq_move_cleanup_interrupt(void)
 {
        unsigned vector, me;
@@ -2386,6 +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);
@@ -2565,9 +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 */
 
@@ -2578,9 +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,
 };
 
@@ -3099,7 +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)
 {
@@ -3121,7 +3122,6 @@ msi_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force)
 
        return IRQ_SET_MASK_OK_NOCOPY;
 }
-#endif /* CONFIG_SMP */
 
 /*
  * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
@@ -3132,9 +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,
 };
 
@@ -3219,7 +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)
@@ -3244,16 +3241,12 @@ dmar_msi_set_affinity(struct irq_data *data, const struct cpumask *mask,
        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,
 };
 
@@ -3274,7 +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)
 {
@@ -3297,16 +3289,12 @@ static int hpet_msi_set_affinity(struct irq_data *data,
        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,
 };
 
@@ -3341,8 +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;
@@ -3370,16 +3356,12 @@ ht_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force)
        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,
 };
 

diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c
index 853902a..e0b18f3 100644 (file)
--- 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.
  *
@@ -926,6 +925,9 @@ intel_ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
        struct irte irte;
        int err;
 
+       if (!config_enabled(CONFIG_SMP))
+               return -EINVAL;
+
        if (!cpumask_intersects(mask, cpu_online_mask))
                return -EINVAL;
 
@@ -963,7 +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,
@@ -1065,9 +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 (file)
--- 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 (file)
--- 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 (file)
--- 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
 };
 
 /*