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From 0105071129aa8df26f4e14516f26e2caa90495ef Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Fri, 18 Sep 2009 17:40:49 +0200
Subject: [PATCH] x86: Disable SPARSE_IRQ, DMAR, INTR_REMAP when PREEMPT_RT=y
commit 82c07cbbdf7d44564497122eb6d984ffe2497fa3 in tip.
Memory allocations in irq/preempt disabled regions is the main cause
of grief with these features. Needs some real work to get that solved.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
arch/x86/Kconfig | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index a06a01e..f9c2be1 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -297,6 +297,7 @@ config X86_X2APIC
config SPARSE_IRQ
bool "Support sparse irq numbering"
depends on PCI_MSI || HT_IRQ
+ depends on !PREEMPT_RT
---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
@@ -1941,7 +1942,7 @@ config PCI_MMCONFIG
config DMAR
bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
- depends on PCI_MSI && ACPI && EXPERIMENTAL
+ depends on PCI_MSI && ACPI && EXPERIMENTAL && !PREEMPT_RT
help
DMA remapping (DMAR) devices support enables independent address
translations for Direct Memory Access (DMA) from devices.
@@ -1984,6 +1985,7 @@ config DMAR_FLOPPY_WA
config INTR_REMAP
bool "Support for Interrupt Remapping (EXPERIMENTAL)"
depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL
+ depends on !PREEMPT_RT
---help---
Supports Interrupt remapping for IO-APIC and MSI devices.
To use x2apic mode in the CPU's which support x2APIC enhancements or
--
1.7.0.4
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