1 files changed, 23 insertions, 1 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 98a0ed52b5c3..0f44add3e0b7 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -247,6 +247,28 @@ config X86_HAS_BOOT_CPU_ID
         def_bool y
         depends on X86_VOYAGER
 
+config SPARSE_IRQ
+        bool "Support sparse irq numbering"
+        depends on PCI_MSI || HT_IRQ
+        help
+          This enables support for sparse irqs. This is useful for distro
+          kernels that want to define a high CONFIG_NR_CPUS value but still
+          want to have low kernel memory footprint on smaller machines.
+
+          ( Sparse IRQs can also be beneficial on NUMA boxes, as they spread
+            out the irq_desc[] array in a more NUMA-friendly way. )
+
+          If you don't know what to do here, say N.
+
+config NUMA_MIGRATE_IRQ_DESC
+        bool "Move irq desc when changing irq smp_affinity"
+        depends on SPARSE_IRQ && NUMA
+        default n
+        help
+          This enables moving irq_desc to cpu/node that irq will use handled.
+
+          If you don't know what to do here, say N.
+
 config X86_FIND_SMP_CONFIG
         def_bool y
         depends on X86_MPPARSE || X86_VOYAGER
@@ -479,7 +501,7 @@ config HPET_TIMER
          The HPET provides a stable time base on SMP
          systems, unlike the TSC, but it is more expensive to access,
          as it is off-chip.  You can find the HPET spec at
-         <http://www.intel.com/hardwaredesign/hpetspec.htm>.
+         <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.
 
          You can safely choose Y here.  However, HPET will only be
          activated if the platform and the BIOS support this feature.