linux-kernel - [PATCH] x86, x2apic: select IRQ_REMAP instead of depends on it

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Date:	Fri, 16 Dec 2011 16:48:54 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	linux-kernel@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH] x86, x2apic: select IRQ_REMAP instead of depends on it

Nikunj A Dadhania found one X3850 x5, found lot of apic wierdness with 3.2-3c5.

It turns out make oldconfig will disable x2apic in new config, it will
make x2apic pre-enabled system confused.

It is caused by
| iommu: Rename the DMAR and INTR_REMAP config options

which renamed INTR_REMAP to IRQ_REMAP.

At very beginning, we do use select instead of depends, but
|    x86, intel-iommu: fix X2APIC && !ACPI build failure
changed select to depends to solve !DMAR compiling error.

Now we have
| iommu/core: Fix build with INTR_REMAP=y && CONFIG_DMAR=n
aka seperate INTR_REMAP and DMAR, and make them select DMAR_TABLE

So we could change back to select with out compiling with !DMAR.
-v2: add depends on X86_IO_APIC, MSI, ACPI, to avoid X2APIC forcely select IRQ_REMAP
     while IRQ_REMAP depends on them. Pointed out by Ingo.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
Acked-by: Suresh Siddha <suresh.b.siddha@...el.com>
---
 arch/x86/Kconfig |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Index: linux-2.6/arch/x86/Kconfig
===================================================================
--- linux-2.6.orig/arch/x86/Kconfig
+++ linux-2.6/arch/x86/Kconfig
@@ -286,7 +286,8 @@ config SMP
 
 config X86_X2APIC
 	bool "Support x2apic"
-	depends on X86_LOCAL_APIC && X86_64 && IRQ_REMAP
+	depends on X86_LOCAL_APIC && X86_64 && X86_IO_APIC && PCI_MSI && ACPI
+	select IRQ_REMAP
 	---help---
 	  This enables x2apic support on CPUs that have this feature.
 
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