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Bug#405346: marked as done (/boot/vmlinuz-2.6.18-3-686: "SMP alternatives: switching to UP code" on SMP system)

Your message dated Thu, 2 Aug 2007 09:54:23 +0200
with message-id <20070802075423.GK9582@stro.at>
and subject line /boot/vmlinuz-2.6.18-3-686: "SMP alternatives: switching to UP code" on SMP system
has caused the attached Bug report to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what I am
talking about this indicates a serious mail system misconfiguration
somewhere.  Please contact me immediately.)

Debian bug tracking system administrator
(administrator, Debian Bugs database)
--- Begin Message --- 
Package: linux-image-2.6.18-3-686
Version: 2.6.18-7
Severity: minor
File: /boot/vmlinuz-2.6.18-3-686


dmesg says this on my SMP system:
...
Checking 'hlt' instruction... OK.
SMP alternatives: switching to UP code
ACPI: Core revision 20060707
CPU0: Intel(R) Pentium(R) D CPU 3.20GHz stepping 04
SMP alternatives: switching to SMP code
Booting processor 1/1 eip 3000
...

Expected behaviour: Since I have an SMP system, the kernel should never need to "switch to UP code".

What I'm hoping to accomplish with this bug report is one of:
1. A change in the kernel so that it doesn't switch to UP code on SMP systems.
2. A pointer to some documentation describing why switching to UP code is necessary on SMP systems.

If alternative 2, I'll update my logcheck rules.

The full dmesg up to and including the above printouts is:
"
Linux version 2.6.18-3-686 (Debian 2.6.18-7) (waldi@debian.org) (gcc version 4.1.2 20061115 (prerelease) 
(Debian 4.1.1-20)) #1 SMP Mon Dec 4 16:41:14 UTC 2006
BIOS-provided physical RAM map:
 BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
 BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
 BIOS-e820: 00000000000e8000 - 0000000000100000 (reserved)
 BIOS-e820: 0000000000100000 - 000000007ffc7300 (usable)
 BIOS-e820: 000000007ffc7300 - 0000000080000000 (reserved)
 BIOS-e820: 00000000f0000000 - 00000000f4000000 (reserved)
 BIOS-e820: 00000000fec00000 - 00000000fed40000 (reserved)
 BIOS-e820: 00000000fed45000 - 0000000100000000 (reserved)
1151MB HIGHMEM available.
896MB LOWMEM available.
found SMP MP-table at 000fe700
On node 0 totalpages: 524231
  DMA zone: 4096 pages, LIFO batch:0
  Normal zone: 225280 pages, LIFO batch:31
  HighMem zone: 294855 pages, LIFO batch:31
DMI 2.4 present.
ACPI: RSDP (v000 COMPAQ                                ) @ 0x000e8610
ACPI: RSDT (v001 COMPAQ CPQ0063  0x20050921  0x00000000) @ 0x7ffc7340
ACPI: FADT (v001 COMPAQ GLENWOOD 0x00000001  0x00000000) @ 0x7ffc73ec
ACPI: MADT (v001 COMPAQ GLENWOOD 0x00000001  0x00000000) @ 0x7ffc7460
ACPI: ASF! (v032 COMPAQ GLENWOOD 0x00000001  0x00000000) @ 0x7ffc74e4
ACPI: MCFG (v001 COMPAQ GLENWOOD 0x00000001  0x00000000) @ 0x7ffc7547
ACPI: TCPA (v001 COMPAQ GLENWOOD 0x00000001  0x00000000) @ 0x7ffc7583
ACPI: DSDT (v001 COMPAQ DSDT_PRJ 0x00000001 MSFT 0x0100000e) @ 0x00000000
ACPI: PM-Timer IO Port: 0xf808
ACPI: Local APIC address 0xfee00000
ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled)
Processor #0 15:4 APIC version 20
ACPI: LAPIC (acpi_id[0x02] lapic_id[0x01] enabled)
Processor #1 15:4 APIC version 20
ACPI: LAPIC (acpi_id[0x03] lapic_id[0x02] disabled)
ACPI: LAPIC (acpi_id[0x04] lapic_id[0x03] disabled)
ACPI: LAPIC_NMI (acpi_id[0x01] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x02] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x03] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x04] high edge lint[0x1])
ACPI: IOAPIC (id[0x01] address[0xfec00000] gsi_base[0])
IOAPIC[0]: apic_id 1, version 32, address 0xfec00000, GSI 0-23
ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
ACPI: IRQ0 used by override.
ACPI: IRQ2 used by override.
ACPI: IRQ9 used by override.
Enabling APIC mode:  Flat.  Using 1 I/O APICs
Using ACPI (MADT) for SMP configuration information
Allocating PCI resources starting at 88000000 (gap: 80000000:70000000)
Detected 3200.313 MHz processor.
Built 1 zonelists.  Total pages: 524231
Kernel command line: root=/dev/sda2 ro
mapped APIC to ffffd000 (fee00000)
mapped IOAPIC to ffffc000 (fec00000)
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Initializing CPU#0
PID hash table entries: 4096 (order: 12, 16384 bytes)
Console: colour VGA+ 80x25
Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
Memory: 2071344k/2096924k available (1543k kernel code, 24300k reserved, 574k data, 196k init, 1179420k 
highmem)Checking if this processor honours the WP bit even in supervisor mode... Ok.
Calibrating delay using timer specific routine.. 6405.96 BogoMIPS (lpj=12811936)
Security Framework v1.0.0 initialized
SELinux:  Disabled at boot.
Capability LSM initialized
Mount-cache hash table entries: 512
CPU: After generic identify, caps: bfebfbff 20100000 00000000 00000000 0000649d 00000000 00000000
CPU: After vendor identify, caps: bfebfbff 20100000 00000000 00000000 0000649d 00000000 00000000
monitor/mwait feature present.
using mwait in idle threads.
CPU: Trace cache: 12K uops, L1 D cache: 16K
CPU: L2 cache: 1024K
CPU: Physical Processor ID: 0
CPU: Processor Core ID: 0
CPU: After all inits, caps: bfebfbff 20100000 00000000 00000180 0000649d 00000000 00000000
Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#0.
CPU0: Intel P4/Xeon Extended MCE MSRs (24) available
CPU0: Thermal monitoring enabled
Compat vDSO mapped to ffffe000.
Checking 'hlt' instruction... OK.
SMP alternatives: switching to UP code
ACPI: Core revision 20060707
CPU0: Intel(R) Pentium(R) D CPU 3.20GHz stepping 04
SMP alternatives: switching to SMP code
Booting processor 1/1 eip 3000
Initializing CPU#1
[...]
"

-- System Information:
Debian Release: 4.0
  APT prefers testing
  APT policy: (990, 'testing')
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.18-3-686
Locale: LANG=sv_SE.ISO-8859-15, LC_CTYPE=sv_SE.ISO-8859-15 (charmap=ISO-8859-15)

Versions of packages linux-image-2.6.18-3-686 depends on:
ii  coreutils                     5.97-5     The GNU core utilities
ii  debconf [debconf-2.0]         1.5.11     Debian configuration management sy
ii  initramfs-tools [linux-initra 0.85e      tools for generating an initramfs
ii  module-init-tools             3.3-pre3-1 tools for managing Linux kernel mo

Versions of packages linux-image-2.6.18-3-686 recommends:
ii  libc6-i686                   2.3.6.ds1-8 GNU C Library: Shared libraries [i

-- debconf information:
  linux-image-2.6.18-3-686/postinst/bootloader-error-2.6.18-3-686:
  linux-image-2.6.18-3-686/postinst/old-dir-initrd-link-2.6.18-3-686: true
  linux-image-2.6.18-3-686/postinst/kimage-is-a-directory:
  linux-image-2.6.18-3-686/postinst/old-system-map-link-2.6.18-3-686: true
  linux-image-2.6.18-3-686/postinst/create-kimage-link-2.6.18-3-686: true
  linux-image-2.6.18-3-686/postinst/bootloader-test-error-2.6.18-3-686:
  linux-image-2.6.18-3-686/preinst/abort-overwrite-2.6.18-3-686:
  linux-image-2.6.18-3-686/postinst/old-initrd-link-2.6.18-3-686: true
  shared/kernel-image/really-run-bootloader: true
  linux-image-2.6.18-3-686/preinst/elilo-initrd-2.6.18-3-686: true
  linux-image-2.6.18-3-686/preinst/lilo-initrd-2.6.18-3-686: true
  linux-image-2.6.18-3-686/postinst/depmod-error-initrd-2.6.18-3-686: false
  linux-image-2.6.18-3-686/preinst/bootloader-initrd-2.6.18-3-686: true
  linux-image-2.6.18-3-686/prerm/removing-running-kernel-2.6.18-3-686: true
  linux-image-2.6.18-3-686/prerm/would-invalidate-boot-loader-2.6.18-3-686: true
  linux-image-2.6.18-3-686/preinst/abort-install-2.6.18-3-686:
  linux-image-2.6.18-3-686/preinst/overwriting-modules-2.6.18-3-686: true
  linux-image-2.6.18-3-686/preinst/initrd-2.6.18-3-686:
  linux-image-2.6.18-3-686/preinst/lilo-has-ramdisk:
  linux-image-2.6.18-3-686/preinst/already-running-this-2.6.18-3-686:
  linux-image-2.6.18-3-686/postinst/depmod-error-2.6.18-3-686: false
  linux-image-2.6.18-3-686/preinst/failed-to-move-modules-2.6.18-3-686:

--- End Message ---
--- Begin Message --- 
> Expected behaviour: Since I have an SMP system, the kernel should never
> need to "switch to UP code".

the number of cpu's are recognized thanks to hotplug cpu on runtime.
this eliminated the need of special -smp images.


closing as no bug.

regards

-- 
maks

--- End Message ---
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