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Cyrill Gorcunov 3f4c3955ea x86, ioapic: Don't call disconnect_bsp_APIC if no APIC present 
Vegard Nossum reported:

[  503.576724] ACPI: Preparing to enter system sleep state S5
[  503.710857] Disabling non-boot CPUs ...
[  503.716853] Power down.
[  503.717770] ------------[ cut here ]------------
[  503.717770] WARNING: at arch/x86/kernel/apic/apic.c:249 native_apic_write_du)
[  503.717770] Hardware name: OptiPlex GX100
[  503.717770] Modules linked in:
[  503.717770] Pid: 2136, comm: halt Not tainted 2.6.30 #443
[  503.717770] Call Trace:
[  503.717770]  [<c154d327>] ? printk+0x18/0x1a
[  503.717770]  [<c1017358>] ? native_apic_write_dummy+0x38/0x50
[  503.717770]  [<c10360fc>] warn_slowpath_common+0x6c/0xc0
[  503.717770]  [<c1017358>] ? native_apic_write_dummy+0x38/0x50
[  503.717770]  [<c1036165>] warn_slowpath_null+0x15/0x20
[  503.717770]  [<c1017358>] native_apic_write_dummy+0x38/0x50
[  503.717770]  [<c1017173>] disconnect_bsp_APIC+0x63/0x100
[  503.717770]  [<c1019e48>] disable_IO_APIC+0xb8/0xc0
[  503.717770]  [<c1214231>] ? acpi_power_off+0x0/0x29
[  503.717770]  [<c1015e55>] native_machine_shutdown+0x65/0x80
[  503.717770]  [<c1015c36>] native_machine_power_off+0x26/0x30
[  503.717770]  [<c1015c49>] machine_power_off+0x9/0x10
[  503.717770]  [<c1046596>] kernel_power_off+0x36/0x40
[  503.717770]  [<c104680d>] sys_reboot+0xfd/0x1f0
[  503.717770]  [<c109daa0>] ? perf_swcounter_event+0xb0/0x130
[  503.717770]  [<c109db7d>] ? perf_counter_task_sched_out+0x5d/0x120
[  503.717770]  [<c102dfc6>] ? finish_task_switch+0x56/0xd0
[  503.717770]  [<c154da1e>] ? schedule+0x49e/0xb40
[  503.717770]  [<c10444b0>] ? sys_kill+0x70/0x160
[  503.717770]  [<c119d9db>] ? selinux_file_ioctl+0x3b/0x50
[  503.717770]  [<c10dd443>] ? sys_ioctl+0x63/0x70
[  503.717770]  [<c1003024>] sysenter_do_call+0x12/0x22
[  503.717770] ---[ end trace 8157b5d0ed378f15 ]---

|
| That's including this commit:
|
| commit 103428e57b
|Author: Cyrill Gorcunov <gorcunov@openvz.org>
|Date:   Sun Jun 7 16:48:40 2009 +0400
|
|    x86, apic: Fix dummy apic read operation together with broken MP handling
|

If we have apic disabled we don't even switch to APIC mode and do not
calling for connect_bsp_APIC. Though on SMP compiled kernel the
native_machine_shutdown does try to write the apic register anyway.

Fix it with explicit check if we really should touch apic registers.

Reported-by: Vegard Nossum <vegard.nossum@gmail.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <20090617181322.GG10822@lenovo>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
 		2009-06-17 20:24:39 +02:00
..
boot x86, boot: use .code16gcc instead of .code16 2009-06-16 17:47:32 -07:00
configs Merge branch 'x86-kbuild-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-06-10 15:30:41 -07:00
crypto crypto: aes-ni - Add support for more modes 2009-06-02 14:04:16 +10:00
ia32 Merge branch 'core/signal' into perfcounters/core 2009-04-30 21:16:49 +02:00
include/asm x86: msr.h linux/types.h is only required for __KERNEL__ 2009-06-17 18:56:01 +02:00
kernel x86, ioapic: Don't call disconnect_bsp_APIC if no APIC present 2009-06-17 20:24:39 +02:00
kvm KVM: Add VT-x machine check support 2009-06-10 12:27:08 +03:00
lguest lguest: PAE support 2009-06-12 22:27:08 +09:30
lib x86: MSR: add methods for writing of an MSR on several CPUs 2009-06-10 12:18:43 +02:00
math-emu Merge branch 'core/percpu' into percpu-cpumask-x86-for-linus-2 2009-03-27 17:28:43 +01:00
mm Merge branch 'linus' into x86/urgent 2009-06-17 08:59:10 +02:00
oprofile Merge branch 'linus' into perfcounters/core 2009-06-11 17:55:42 +02:00
pci Merge branch 'irq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-06-10 15:25:41 -07:00
power x86: unify power/cpu_(32|64).c 2009-06-12 21:32:31 +02:00
vdso Merge branch 'linus' into perfcounters/core 2009-06-11 17:55:42 +02:00
video
…
xen Merge branch 'x86-xen-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-06-10 16:16:27 -07:00
Kbuild x86: standardize Kbuild rules 2009-04-16 18:09:02 +02:00
Kconfig Merge branch 'linus' into x86/mce3 2009-06-11 23:31:52 +02:00
Kconfig.cpu Revert "x86, bts: reenable ptrace branch trace support" 2009-06-11 00:32:00 +02:00
Kconfig.debug Merge branch 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-06-10 19:53:40 -07:00
Makefile Merge branch 'x86-kbuild-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-06-10 15:30:41 -07:00
Makefile_32.cpu
…