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authorYinghai Lu <yinghai@kernel.org>2009-02-16 17:29:58 -0800
committerIngo Molnar <mingo@elte.hu>2009-02-17 12:22:20 +0100
commit06cd9a7dc8a58186060a91b6ddc031057435fd34 (patch)
treecc015c3a966f31ef77cb458e0b480ffc0eb12acd /arch/x86/Kconfig
parent9f361c221912b6ffa1f7836e0bbf843917f6fce7 (diff)
x86: add x2apic config
Impact: cleanup so could deselect x2apic and INTR_REMAP will select x2apic Signed-off-by: Yinghai Lu <yinghai@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/Kconfig')
-rw-r--r--arch/x86/Kconfig15
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 1042d69b267..bce241fe1d2 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -235,6 +235,20 @@ config SMP
If you don't know what to do here, say N.
+config X86_X2APIC
+ bool "Support x2apic"
+ depends on X86_LOCAL_APIC && X86_64
+ ---help---
+ This enables x2apic support on CPUs that have this feature.
+
+ This allows 32-bit apic IDs (so it can support very large systems),
+ and accesses the local apic via MSRs not via mmio.
+
+ ( On certain CPU models you may need to enable INTR_REMAP too,
+ to get functional x2apic mode. )
+
+ If you don't know what to do here, say N.
+
config SPARSE_IRQ
bool "Support sparse irq numbering"
depends on PCI_MSI || HT_IRQ
@@ -1828,6 +1842,7 @@ config DMAR_FLOPPY_WA
config INTR_REMAP
bool "Support for Interrupt Remapping (EXPERIMENTAL)"
depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL
+ select X86_X2APIC
---help---
Supports Interrupt remapping for IO-APIC and MSI devices.
To use x2apic mode in the CPU's which support x2APIC enhancements or