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1c83995b6c
linux/arch/x86
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Suresh Siddha 1c83995b6c x86, ioapic: Document another case when level irq is seen as an edge 
In the case when cpu goes offline, fixup_irqs() will forward any
unhandled interrupt on the offlined cpu to the new cpu
destination that is handling the corresponding interrupt. This
interrupt forwarding is done via IPI's. Hence, in this case also
level-triggered io-apic interrupt will be seen as an edge
interrupt in the cpu's APIC IRR.

Document this scenario in the code which handles this case by doing
an explicit EOI to the io-apic to clear remote IRR of the io-apic RTE.

Requested-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Maciej W. Rozycki <macro@linux-mips.org>
Cc: ebiederm@xmission.com
Cc: garyhade@us.ibm.com
LKML-Reference: <20091201233335.143970505@sbs-t61.sc.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-12-02 10:11:01 +01:00
..
boot Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-09-26 10:13:35 -07:00
configs tracing: Rename FTRACE_SYSCALLS for tracepoints 2009-08-26 00:17:35 +02:00
crypto Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-09-14 07:57:32 -07:00
ia32 x86: Don't leak 64-bit kernel register values to 32-bit processes 2009-10-01 11:24:26 +02:00
include/asm x86: io-apic: IO-APIC MMIO should not fail on resource insertion 2009-11-16 16:37:10 +01:00
kernel x86, ioapic: Document another case when level irq is seen as an edge 2009-12-02 10:11:01 +01:00
kvm KVM: add support for change_pte mmu notifiers 2009-10-04 17:04:53 +02:00
lguest lguest: move panic notifier registration to its expected place. 2009-09-23 22:26:44 +09:30
lib x86: Don't generate cmpxchg8b_emu if CONFIG_X86_CMPXCHG64=y 2009-10-01 08:42:24 +02:00
math-emu
mm x86: apic: Print out SRAT table APIC id in hex 2009-11-23 09:56:30 +01:00
oprofile perf: Do the big rename: Performance Counters -> Performance Events 2009-09-21 14:28:04 +02:00
pci const: mark struct vm_struct_operations 2009-09-27 11:39:25 -07:00
power x86: Remove final bits of CONFIG_X86_OLD_MCE 2009-09-18 08:31:23 +02:00
vdso kbuild: rename ld-option to cc-ldoption 2009-09-20 12:27:42 +02:00
video
xen const: constify remaining file_operations 2009-10-01 16:11:11 -07:00
Kbuild
Kconfig x86, SLUB: Remove unused CONFIG FAST_CMPXCHG_LOCAL 2009-10-01 10:59:08 +02:00
Kconfig.cpu x86: Optimize cmpxchg64() at build-time some more 2009-10-01 08:01:08 +02:00
Kconfig.debug kmemcheck: make kconfig accessible for other architectures 2009-06-15 15:49:17 +02:00
Makefile kbuild: use INSTALLKERNEL to select customized installkernel script 2009-09-20 12:18:14 +02:00
Makefile_32.cpu x86: add specific support for Intel Atom architecture 2009-08-23 11:20:02 +02:00