kernel/irq/Kconfig

   1 menu "IRQ subsystem"
   2 # Options selectable by the architecture code
   3
   4 # Make sparse irq Kconfig switch below available
   5 config MAY_HAVE_SPARSE_IRQ
   6        bool
   7
   8 # Legacy support, required for itanic
   9 config GENERIC_IRQ_LEGACY
  10        bool
  11
  12 # Enable the generic irq autoprobe mechanism
  13 config GENERIC_IRQ_PROBE
  14         bool
  15
  16 # Use the generic /proc/interrupts implementation
  17 config GENERIC_IRQ_SHOW
  18        bool
  19
  20 # Print level/edge extra information
  21 config GENERIC_IRQ_SHOW_LEVEL
  22        bool
  23
  24 # Facility to allocate a hardware interrupt. This is legacy support
  25 # and should not be used in new code. Use irq domains instead.
  26 config GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
  27        bool
  28
  29 # Support for delayed migration from interrupt context
  30 config GENERIC_PENDING_IRQ
  31         bool
  32
  33 # Alpha specific irq affinity mechanism
  34 config AUTO_IRQ_AFFINITY
  35        bool
  36
  37 # Tasklet based software resend for pending interrupts on enable_irq()
  38 config HARDIRQS_SW_RESEND
  39        bool
  40
  41 # Preflow handler support for fasteoi (sparc64)
  42 config IRQ_PREFLOW_FASTEOI
  43        bool
  44
  45 # Edge style eoi based handler (cell)
  46 config IRQ_EDGE_EOI_HANDLER
  47        bool
  48
  49 # Generic configurable interrupt chip implementation
  50 config GENERIC_IRQ_CHIP
  51        bool
  52        select IRQ_DOMAIN
  53
  54 # Generic irq_domain hw <--> linux irq number translation
  55 config IRQ_DOMAIN
  56         bool
  57
  58 config HANDLE_DOMAIN_IRQ
  59         bool
  60
  61 config IRQ_DOMAIN_DEBUG
  62         bool "Expose hardware/virtual IRQ mapping via debugfs"
  63         depends on IRQ_DOMAIN && DEBUG_FS
  64         help
  65           This option will show the mapping relationship between hardware irq
  66           numbers and Linux irq numbers. The mapping is exposed via debugfs
  67           in the file "irq_domain_mapping".
  68
  69           If you don't know what this means you don't need it.
  70
  71 # Support forced irq threading
  72 config IRQ_FORCED_THREADING
  73        bool
  74
  75 config SPARSE_IRQ
  76         bool "Support sparse irq numbering" if MAY_HAVE_SPARSE_IRQ
  77         ---help---
  78
  79           Sparse irq numbering is useful for distro kernels that want
  80           to define a high CONFIG_NR_CPUS value but still want to have
  81           low kernel memory footprint on smaller machines.
  82
  83           ( Sparse irqs can also be beneficial on NUMA boxes, as they spread
  84             out the interrupt descriptors in a more NUMA-friendly way. )
  85
  86           If you don't know what to do here, say N.
  87
  88 endmenu