This is a note to let you know that I've just added the patch titled
x86/apic: Disable I/O APIC before shutdown of the local APIC
to the 3.12-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-disable-i-o-apic-before-shutdown-of-the-local-apic.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 522e66464467543c0d88d023336eec4df03ad40b Mon Sep 17 00:00:00 2001
From: Fenghua Yu <[email protected]>
Date: Wed, 23 Oct 2013 18:30:12 -0700
Subject: x86/apic: Disable I/O APIC before shutdown of the local APIC
From: Fenghua Yu <[email protected]>
commit 522e66464467543c0d88d023336eec4df03ad40b upstream.
In reboot and crash path, when we shut down the local APIC, the I/O APIC is
still active. This may cause issues because external interrupts
can still come in and disturb the local APIC during shutdown process.
To quiet external interrupts, disable I/O APIC before shutdown local APIC.
Signed-off-by: Fenghua Yu <[email protected]>
Link:
http://lkml.kernel.org/r/[email protected]
[ I suppose the 'issue' is a hang during shutdown. It's a fine change
nevertheless. ]
Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/x86/kernel/crash.c | 2 +-
arch/x86/kernel/reboot.c | 8 ++++----
2 files changed, 5 insertions(+), 5 deletions(-)
--- a/arch/x86/kernel/crash.c
+++ b/arch/x86/kernel/crash.c
@@ -127,12 +127,12 @@ void native_machine_crash_shutdown(struc
cpu_emergency_vmxoff();
cpu_emergency_svm_disable();
- lapic_shutdown();
#ifdef CONFIG_X86_IO_APIC
/* Prevent crash_kexec() from deadlocking on ioapic_lock. */
ioapic_zap_locks();
disable_IO_APIC();
#endif
+ lapic_shutdown();
#ifdef CONFIG_HPET_TIMER
hpet_disable();
#endif
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -550,6 +550,10 @@ static void native_machine_emergency_res
void native_machine_shutdown(void)
{
/* Stop the cpus and apics */
+#ifdef CONFIG_X86_IO_APIC
+ disable_IO_APIC();
+#endif
+
#ifdef CONFIG_SMP
/*
* Stop all of the others. Also disable the local irq to
@@ -562,10 +566,6 @@ void native_machine_shutdown(void)
lapic_shutdown();
-#ifdef CONFIG_X86_IO_APIC
- disable_IO_APIC();
-#endif
-
#ifdef CONFIG_HPET_TIMER
hpet_disable();
#endif
Patches currently in stable-queue which might be from [email protected] are
queue-3.12/x86-apic-disable-i-o-apic-before-shutdown-of-the-local-apic.patch
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