Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next

Pull core irq updates from Thomas Gleixner:
 "The irq department delivers:

   - Another tree wide update to get rid of the horrible create_irq
     interface along with its even more horrible variants.  That also
     gets rid of the last leftovers of the initial sparse irq hackery.
     arch/driver specific changes have been either acked or ignored.

   - A fix for the spurious interrupt detection logic with threaded
     interrupts.

   - A new ARM SoC interrupt controller

   - The usual pile of fixes and improvements all over the place"

* 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (40 commits)
  Documentation: brcmstb-l2: Add Broadcom STB Level-2 interrupt controller binding
  irqchip: brcmstb-l2: Add Broadcom Set Top Box Level-2 interrupt controller
  genirq: Improve documentation to match current implementation
  ARM: iop13xx: fix msi support with sparse IRQ
  genirq: Provide !SMP stub for irq_set_affinity_notifier()
  irqchip: armada-370-xp: Move the devicetree binding documentation
  irqchip: gic: Use mask field in GICC_IAR
  genirq: Remove dynamic_irq mess
  ia64: Use irq_init_desc
  genirq: Replace dynamic_irq_init/cleanup
  genirq: Remove irq_reserve_irq[s]
  genirq: Replace reserve_irqs in core code
  s390: Avoid call to irq_reserve_irqs()
  s390: Remove pointless arch_show_interrupts()
  s390: pci: Check return value of alloc_irq_desc() proper
  sh: intc: Remove pointless irq_reserve_irqs() invocation
  x86, irq: Remove pointless irq_reserve_irqs() call
  genirq: Make create/destroy_irq() ia64 private
  tile: Use SPARSE_IRQ
  tile: pci: Use irq_alloc/free_hwirq()
  ...

4 files changed, 17 insertions, 48 deletions

diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig
index 85258ca43ff5..4f3006b600e3 100644
--- a/arch/tile/Kconfig
+++ b/arch/tile/Kconfig
@@ -125,6 +125,8 @@ config HVC_TILE
 
 config TILEGX
         bool "Building for TILE-Gx (64-bit) processor"
+        select SPARSE_IRQ
+        select GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
         select HAVE_FUNCTION_TRACER
         select HAVE_FUNCTION_TRACE_MCOUNT_TEST
         select HAVE_FUNCTION_GRAPH_TRACER
diff --git a/arch/tile/include/asm/irq.h b/arch/tile/include/asm/irq.h
index 33cff9a3058b..1fe86911838b 100644
--- a/arch/tile/include/asm/irq.h
+++ b/arch/tile/include/asm/irq.h
@@ -18,10 +18,12 @@
 #include <linux/hardirq.h>
 
 /* The hypervisor interface provides 32 IRQs. */
-#define NR_IRQS 32
+#define NR_IRQS                 32
 
 /* IRQ numbers used for linux IPIs. */
-#define IRQ_RESCHEDULE 0
+#define IRQ_RESCHEDULE  0
+/* Interrupts for dynamic allocation start at 1. Let the core allocate irq0 */
+#define NR_IRQS_LEGACY  1
 
 #define irq_canonicalize(irq)   (irq)
 
diff --git a/arch/tile/kernel/irq.c b/arch/tile/kernel/irq.c
index 906a76bdb31d..637f2ffaa5f5 100644
--- a/arch/tile/kernel/irq.c
+++ b/arch/tile/kernel/irq.c
@@ -54,13 +54,6 @@ static DEFINE_PER_CPU(unsigned long, irq_disable_mask)
  */
 static DEFINE_PER_CPU(int, irq_depth);
 
-/* State for allocating IRQs on Gx. */
-#if CHIP_HAS_IPI()
-static unsigned long available_irqs = ((1UL << NR_IRQS) - 1) &
-                                      (~(1UL << IRQ_RESCHEDULE));
-static DEFINE_SPINLOCK(available_irqs_lock);
-#endif
-
 #if CHIP_HAS_IPI()
 /* Use SPRs to manipulate device interrupts. */
 #define mask_irqs(irq_mask) __insn_mtspr(SPR_IPI_MASK_SET_K, irq_mask)
@@ -278,38 +271,11 @@ int arch_show_interrupts(struct seq_file *p, int prec)
         return 0;
 }
 
-/*
- * Generic, controller-independent functions:
- */
-
 #if CHIP_HAS_IPI()
-int create_irq(void)
+int arch_setup_hwirq(unsigned int irq, int node)
 {
-        unsigned long flags;
-        int result;
-
-        spin_lock_irqsave(&available_irqs_lock, flags);
-        if (available_irqs == 0)
-                result = -ENOMEM;
-        else {
-                result = __ffs(available_irqs);
-                available_irqs &= ~(1UL << result);
-                dynamic_irq_init(result);
-        }
-        spin_unlock_irqrestore(&available_irqs_lock, flags);
-
-        return result;
+        return irq >= NR_IRQS ? -EINVAL : 0;
 }
-EXPORT_SYMBOL(create_irq);
 
-void destroy_irq(unsigned int irq)
-{
-        unsigned long flags;
-
-        spin_lock_irqsave(&available_irqs_lock, flags);
-        available_irqs |= (1UL << irq);
-        dynamic_irq_cleanup(irq);
-        spin_unlock_irqrestore(&available_irqs_lock, flags);
-}
-EXPORT_SYMBOL(destroy_irq);
+void arch_teardown_hwirq(unsigned int irq) { }
 #endif
diff --git a/arch/tile/kernel/pci_gx.c b/arch/tile/kernel/pci_gx.c
index 077b7bc437e5..e39f9c542807 100644
--- a/arch/tile/kernel/pci_gx.c
+++ b/arch/tile/kernel/pci_gx.c
@@ -350,10 +350,9 @@ static int tile_init_irqs(struct pci_controller *controller)
                 int cpu;
 
                 /* Ask the kernel to allocate an IRQ. */
-                irq = create_irq();
-                if (irq < 0) {
+                irq = irq_alloc_hwirq(-1);
+                if (!irq) {
                         pr_err("PCI: no free irq vectors, failed for %d\n", i);
-
                         goto free_irqs;
                 }
                 controller->irq_intx_table[i] = irq;
@@ -382,7 +381,7 @@ static int tile_init_irqs(struct pci_controller *controller)
 
 free_irqs:
         for (j = 0; j < i; j++)
-                destroy_irq(controller->irq_intx_table[j]);
+                irq_free_hwirq(controller->irq_intx_table[j]);
 
         return -1;
 }
@@ -1500,9 +1499,9 @@ int arch_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *desc)
         int irq;
         int ret;
 
-        irq = create_irq();
-        if (irq < 0)
-                return irq;
+        irq = irq_alloc_hwirq(-1);
+        if (!irq)
+                return -ENOSPC;
 
         /*
          * Since we use a 64-bit Mem-Map to accept the MSI write, we fail
@@ -1601,11 +1600,11 @@ hv_msi_config_failure:
         /* Free mem-map */
 msi_mem_map_alloc_failure:
 is_64_failure:
-        destroy_irq(irq);
+        irq_free_hwirq(irq);
         return ret;
 }
 
 void arch_teardown_msi_irq(unsigned int irq)
 {
-        destroy_irq(irq);
+        irq_free_hwirq(irq);
 }