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    Subjectwarning in arch/x86/kernel/cpu/mtrr/generic.c:400 with 2.6.29-rc3 on IBM x3400
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    Hi,

    just for fun i installed linux 2.6.29-rc3 on a IBM x3400 server for
    testing purposes and get a warning in
    arch/x86/kernel/cpu/mtrr/generic.c:

    Kernel failure message 1:
    ------------[ cut here ]------------
    WARNING: at arch/x86/kernel/cpu/mtrr/generic.c:400
    generic_get_mtrr+0xc6/0x104() (Not tainted)
    Hardware name: IBM eServer x3400-[7976KCG]-
    mtrr: your BIOS has set up an incorrect mask, fixing it up.
    Modules linked in:
    Pid: 0, comm: swapper Not tainted 2.6.29-0.66.rc3.fc11.x86_64 #1
    Call Trace:
    [<ffffffff8104a5c1>] warn_slowpath+0xb9/0xfe
    [<ffffffff8106ef5b>] ? lock_acquired+0x29e/0x2ae
    [<ffffffff81016ea4>] ? sched_clock+0xa/0xc
    [<ffffffff8106bc68>] ? lock_release_holdtime+0x2c/0x123
    [<ffffffff8106f633>] ? lock_release+0x17c/0x189
    [<ffffffff8119a570>] ? _raw_spin_unlock+0x8f/0x93
    [<ffffffff8106c741>] ? trace_hardirqs_off+0xd/0xf
    [<ffffffff8101f915>] generic_get_mtrr+0xc6/0x104
    [<ffffffff8160efa0>] mtrr_trim_uncached_memory+0x8e/0x2f5
    [<ffffffff813806d9>] ? printk+0x3c/0x43
    [<ffffffff816190f6>] ? early_gart_iommu_check+0x98/0x26a
    [<ffffffff81602140>] ? early_idt_handler+0x0/0x71
    [<ffffffff8160a825>] setup_arch+0x41c/0x7d1
    [<ffffffff8138338e>] ? _spin_unlock_irqrestore+0x40/0x57
    [<ffffffff81602a8e>] start_kernel+0xa2/0x3e2
    [<ffffffff816022bf>] x86_64_start_reservations+0xaa/0xae
    [<ffffffff816023ca>] x86_64_start_kernel+0xe4/0xf3
    ---[ end trace 4eaa2a86a8e2da22 ]---

    lspci:

    00:00.0 Host bridge: Intel Corporation 5000P Chipset Memory Controller
    Hub (rev b1)
    00:02.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x8
    Port 2-3 (rev b1)
    00:03.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x4
    Port 3 (rev b1)
    00:04.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x8
    Port 4-5 (rev b1)
    00:05.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x4
    Port 5 (rev b1)
    00:06.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x8
    Port 6-7 (rev b1)
    00:07.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x4
    Port 7 (rev b1)
    00:10.0 Host bridge: Intel Corporation 5000 Series Chipset FSB Registers
    (rev b1)
    00:10.1 Host bridge: Intel Corporation 5000 Series Chipset FSB Registers
    (rev b1)
    00:10.2 Host bridge: Intel Corporation 5000 Series Chipset FSB Registers
    (rev b1)
    00:11.0 Host bridge: Intel Corporation 5000 Series Chipset Reserved
    Registers (rev b1)
    00:13.0 Host bridge: Intel Corporation 5000 Series Chipset Reserved
    Registers (rev b1)
    00:15.0 Host bridge: Intel Corporation 5000 Series Chipset FBD Registers
    (rev b1)
    00:16.0 Host bridge: Intel Corporation 5000 Series Chipset FBD Registers
    (rev b1)
    00:1c.0 PCI bridge: Intel Corporation 631xESB/632xESB/3100 Chipset PCI
    Express Root Port 1 (rev 09)
    00:1c.1 PCI bridge: Intel Corporation 631xESB/632xESB/3100 Chipset PCI
    Express Root Port 2 (rev 09)
    00:1d.0 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset
    UHCI USB Controller #1 (rev 09)
    00:1d.1 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset
    UHCI USB Controller #2 (rev 09)
    00:1d.2 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset
    UHCI USB Controller #3 (rev 09)
    00:1d.3 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset
    UHCI USB Controller #4 (rev 09)
    00:1d.7 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset
    EHCI USB2 Controller (rev 09)
    00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev d9)
    00:1f.0 ISA bridge: Intel Corporation 631xESB/632xESB/3100 Chipset LPC
    Interface Controller (rev 09)
    00:1f.1 IDE interface: Intel Corporation 631xESB/632xESB IDE Controller
    (rev 09)
    00:1f.3 SMBus: Intel Corporation 631xESB/632xESB/3100 Chipset SMBus
    Controller (rev 09)
    01:00.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express
    Upstream Port (rev 01)
    01:00.3 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express to
    PCI-X Bridge (rev 01)
    02:00.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express
    Downstream Port E1 (rev 01)
    02:01.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express
    Downstream Port E2 (rev 01)
    03:00.0 RAID bus controller: Adaptec AAC-RAID (Rocket) (rev 02)
    1a:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5721
    Gigabit Ethernet PCI Express (rev 21)
    1c:04.0 VGA compatible controller: ATI Technologies Inc ES1000 (rev 02)

    Bios is the newest IBM BIOS.
    There are no problems with previous kernel versions like 2.6.18-92 or
    2.6.27.

    Any ideas about the CPU/BIOS warning?

    -

    Morten




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