This is a note to let you know that I've just added the patch titled
x86/apic: Re-enable PCI_MSI support for non-SMP X86_32
to the 3.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-apic-re-enable-pci_msi-support-for-non-smp-x86_32.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 38a1dfda8e77d7ba74c94d06d8bc41ba98a4bc8c Mon Sep 17 00:00:00 2001
From: Bryan O'Donoghue <pure.logic@xxxxxxxxxxxxxxxxx>
Date: Thu, 22 Jan 2015 22:58:49 +0000
Subject: x86/apic: Re-enable PCI_MSI support for non-SMP X86_32
From: Bryan O'Donoghue <pure.logic@xxxxxxxxxxxxxxxxx>
commit 38a1dfda8e77d7ba74c94d06d8bc41ba98a4bc8c upstream.
Commit 0dbc6078c06bc0 ('x86, build, pci: Fix PCI_MSI build on !SMP')
introduced the dependency that X86_UP_APIC is only available when
PCI_MSI is false. This effectively prevents PCI_MSI support on 32bit
UP systems because it disables both APIC and IO-APIC. But APIC support
is architecturally required for PCI_MSI.
The intention of the patch was to enforce APIC support when PCI_MSI is
enabled, but failed to do so.
Remove the !PCI_MSI dependency from X86_UP_APIC and enforce
X86_UP_APIC when PCI_MSI support is enabled on 32bit UP systems.
[ tglx: Massaged changelog ]
Fixes 0dbc6078c06bc0 'x86, build, pci: Fix PCI_MSI build on !SMP'
Signed-off-by: Bryan O'Donoghue <pure.logic@xxxxxxxxxxxxxxxxx>
Suggested-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
Cc: Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1421967529-9037-1-git-send-email-pure.logic@xxxxxxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/Kconfig | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -856,7 +856,7 @@ source "kernel/Kconfig.preempt"
config X86_UP_APIC
bool "Local APIC support on uniprocessors"
- depends on X86_32 && !SMP && !X86_32_NON_STANDARD && !PCI_MSI
+ depends on X86_32 && !SMP && !X86_32_NON_STANDARD
---help---
A local APIC (Advanced Programmable Interrupt Controller) is an
integrated interrupt controller in the CPU. If you have a single-CPU
@@ -867,6 +867,10 @@ config X86_UP_APIC
performance counters), and the NMI watchdog which detects hard
lockups.
+config X86_UP_APIC_MSI
+ def_bool y
+ select X86_UP_APIC if X86_32 && !SMP && !X86_32_NON_STANDARD && PCI_MSI
+
config X86_UP_IOAPIC
bool "IO-APIC support on uniprocessors"
depends on X86_UP_APIC
Patches currently in stable-queue which might be from pure.logic@xxxxxxxxxxxxxxxxx are
queue-3.18/x86-apic-re-enable-pci_msi-support-for-non-smp-x86_32.patch
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