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    SubjectRe: Linux 2.6.31-rc4: strange change in iomem allocation
    Date
    I'm seeing the following change in dmesg between -rc3 and -rc4:
    -system 00:0c: iomem range 0xfec00000-0xfec000ff has been reserved
    +system 00:0c: iomem range 0xfec00000-0xfec000ff could not be reserved

    There is nothing in the earlier part of dmesg that would explain this
    change.

    The change is also visible in /proc/iomem:
    fec00000-fec00fff : IOAPIC 0
    fec00000-fec00fff : reserved
    - fec00000-fec000ff : pnp 00:0c

    I somewhat suspect 857fdc53a0a90c3ba7fcf5b1fb4c7a62ae03cf82:
    x86/pci: insert ioapic resource before assigning unassigned resources

    System is HP 2510p notebook (x86_64).

    Cheers,
    FJP

    Linux version 2.6.31-rc4-pat (root@aragorn) (gcc version 4.3.2 (Debian 4.3.2-1.1) ) #19 SMP Thu Jul 23 15:32:44 CEST 2009
    Command line: root=/dev/mapper/main-root ro vga=791 quiet
    KERNEL supported cpus:
    Intel GenuineIntel
    AMD AuthenticAMD
    Centaur CentaurHauls
    BIOS-provided physical RAM map:
    BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
    BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
    BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)
    BIOS-e820: 0000000000100000 - 000000007e7b0000 (usable)
    BIOS-e820: 000000007e7b0000 - 000000007e7c5400 (reserved)
    BIOS-e820: 000000007e7c5400 - 000000007e7e7fb8 (ACPI NVS)
    BIOS-e820: 000000007e7e7fb8 - 000000007f000000 (reserved)
    BIOS-e820: 00000000fec00000 - 00000000fec01000 (reserved)
    BIOS-e820: 00000000fed20000 - 00000000fed9a000 (reserved)
    BIOS-e820: 00000000feda0000 - 00000000fedc0000 (reserved)
    BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
    BIOS-e820: 00000000ffb00000 - 00000000ffc00000 (reserved)
    BIOS-e820: 00000000fff00000 - 0000000100000000 (reserved)
    DMI 2.4 present.
    last_pfn = 0x7e7b0 max_arch_pfn = 0x400000000
    MTRR default type: uncachable
    MTRR fixed ranges enabled:
    00000-9FFFF write-back
    A0000-BFFFF uncachable
    C0000-D3FFF write-protect
    D4000-EFFFF uncachable
    F0000-FFFFF write-protect
    MTRR variable ranges enabled:
    0 base 000000000 mask F80000000 write-back
    1 base 07F000000 mask FFF000000 uncachable
    2 base 07E800000 mask FFF800000 uncachable
    3 base 0FEDA0000 mask FFFFE0000 uncachable
    4 disabled
    5 disabled
    6 disabled
    7 disabled
    x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
    initial memory mapped : 0 - 20000000
    init_memory_mapping: 0000000000000000-000000007e7b0000
    0000000000 - 007e600000 page 2M
    007e600000 - 007e7b0000 page 4k
    kernel direct mapping tables up to 7e7b0000 @ 8000-c000
    RAMDISK: 37a92000 - 37fef7d8
    ACPI: RSDP 00000000000f7960 00024 (v02 HP )
    ACPI: XSDT 000000007e7c81c8 0007C (v01 HPQOEM SLIC-MPC 00000001 HP 00000001)
    ACPI: FACP 000000007e7c8084 000F4 (v04 HP 30C9 00000003 HP 00000001)
    ACPI: DSDT 000000007e7c8538 13484 (v01 HP nc2500 00010000 MSFT 03000001)
    ACPI: FACS 000000007e7e7d80 00040
    ACPI: SLIC 000000007e7c8244 00176 (v01 HPQOEM SLIC-MPC 00000001 HP 00000001)
    ACPI: HPET 000000007e7c83bc 00038 (v01 HP 30C9 00000001 HP 00000001)
    ACPI: APIC 000000007e7c83f4 00068 (v01 HP 30C9 00000001 HP 00000001)
    ACPI: MCFG 000000007e7c845c 0003C (v01 HP 30C9 00000001 HP 00000001)
    ACPI: TCPA 000000007e7c8498 00032 (v02 HP 30C9 00000001 HP 00000001)
    ACPI: ASF! 000000007e7c84cc 00069 (v16 HP CHIMAYU 00000001 HP 00000000)
    ACPI: SSDT 000000007e7db9bc 002BE (v01 HP HPQPAT 00000001 MSFT 03000001)
    ACPI: SSDT 000000007e7dc640 0025F (v01 HP Cpu0Tst 00003000 INTL 20060317)
    ACPI: SSDT 000000007e7dc89f 000A6 (v01 HP Cpu1Tst 00003000 INTL 20060317)
    ACPI: SSDT 000000007e7dc945 004D7 (v01 HP CpuPm 00003000 INTL 20060317)
    ACPI: Local APIC address 0xfee00000
    (7 early reservations) ==> bootmem [0000000000 - 007e7b0000]
    #0 [0000000000 - 0000001000] BIOS data page ==> [0000000000 - 0000001000]
    #1 [0000006000 - 0000008000] TRAMPOLINE ==> [0000006000 - 0000008000]
    #2 [0001000000 - 00014eabb0] TEXT DATA BSS ==> [0001000000 - 00014eabb0]
    #3 [0037a92000 - 0037fef7d8] RAMDISK ==> [0037a92000 - 0037fef7d8]
    #4 [000009fc00 - 0000100000] BIOS reserved ==> [000009fc00 - 0000100000]
    #5 [00014eb000 - 00014eb18c] BRK ==> [00014eb000 - 00014eb18c]
    #6 [0000008000 - 000000a000] PGTABLE ==> [0000008000 - 000000a000]
    [ffffea0000000000-ffffea0001ffffff] PMD -> [ffff880001a00000-ffff8800039fffff] on node 0
    Zone PFN ranges:
    DMA 0x00000000 -> 0x00001000
    DMA32 0x00001000 -> 0x00100000
    Normal 0x00100000 -> 0x00100000
    Movable zone start PFN for each node
    early_node_map[2] active PFN ranges
    0: 0x00000000 -> 0x0000009f
    0: 0x00000100 -> 0x0007e7b0
    On node 0 totalpages: 517967
    DMA zone: 64 pages used for memmap
    DMA zone: 101 pages reserved
    DMA zone: 3834 pages, LIFO batch:0
    DMA32 zone: 8031 pages used for memmap
    DMA32 zone: 505937 pages, LIFO batch:31
    ACPI: PM-Timer IO Port: 0x1008
    ACPI: Local APIC address 0xfee00000
    ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled)
    ACPI: LAPIC (acpi_id[0x02] lapic_id[0x01] enabled)
    ACPI: LAPIC_NMI (acpi_id[0x01] high edge lint[0x1])
    ACPI: LAPIC_NMI (acpi_id[0x02] 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.
    Using ACPI (MADT) for SMP configuration information
    ACPI: HPET id: 0x8086a201 base: 0xfed00000
    SMP: Allowing 2 CPUs, 0 hotplug CPUs
    nr_irqs_gsi: 24
    PM: Registered nosave memory: 000000000009f000 - 00000000000a0000
    PM: Registered nosave memory: 00000000000a0000 - 00000000000e0000
    PM: Registered nosave memory: 00000000000e0000 - 0000000000100000
    Allocating PCI resources starting at 7f000000 (gap: 7f000000:7fc00000)
    NR_CPUS:8 nr_cpumask_bits:8 nr_cpu_ids:2 nr_node_ids:1
    PERCPU: Embedded 25 pages at ffff880001504000, static data 71392 bytes
    Built 1 zonelists in Zone order, mobility grouping on. Total pages: 509771
    Kernel command line: root=/dev/mapper/main-root ro vga=791 quiet
    PID hash table entries: 4096 (order: 12, 32768 bytes)
    Dentry cache hash table entries: 262144 (order: 9, 2097152 bytes)
    Inode-cache hash table entries: 131072 (order: 8, 1048576 bytes)
    Initializing CPU#0
    Checking aperture...
    No AGP bridge found
    Memory: 2024536k/2072256k available (2404k kernel code, 388k absent, 46756k reserved, 1574k data, 360k init)
    SLUB: Genslabs=13, HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1
    NR_IRQS:512
    Extended CMOS year: 2000
    Fast TSC calibration using PIT
    Detected 1330.026 MHz processor.
    Console: colour dummy device 80x25
    console [tty0] enabled
    hpet clockevent registered
    HPET: 3 timers in total, 0 timers will be used for per-cpu timer
    Calibrating delay loop (skipped), value calculated using timer frequency.. 2660.05 BogoMIPS (lpj=5320104)
    Security Framework initialized
    SELinux: Disabled at boot.
    Mount-cache hash table entries: 256
    CPU: L1 I cache: 32K, L1 D cache: 32K
    CPU: L2 cache: 2048K
    CPU: Physical Processor ID: 0
    CPU: Processor Core ID: 0
    mce: CPU supports 6 MCE banks
    CPU0: Thermal monitoring handled by SMI
    using mwait in idle threads.
    ACPI: Core revision 20090521
    Setting APIC routing to flat
    ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
    CPU0: Intel(R) Core(TM)2 Duo CPU U7700 @ 1.33GHz stepping 0d
    Booting processor 1 APIC 0x1 ip 0x6000
    Initializing CPU#1
    Calibrating delay using timer specific routine.. 2659.98 BogoMIPS (lpj=5319961)
    CPU: L1 I cache: 32K, L1 D cache: 32K
    CPU: L2 cache: 2048K
    CPU: Physical Processor ID: 0
    CPU: Processor Core ID: 1
    mce: CPU supports 6 MCE banks
    CPU1: Thermal monitoring enabled (TM2)
    x86 PAT enabled: cpu 1, old 0x7040600070406, new 0x7010600070106
    CPU1: Intel(R) Core(TM)2 Duo CPU U7700 @ 1.33GHz stepping 0d
    checking TSC synchronization [CPU#0 -> CPU#1]: passed.
    Brought up 2 CPUs
    Total of 2 processors activated (5320.03 BogoMIPS).
    CPU0 attaching sched-domain:
    domain 0: span 0-1 level MC
    groups: 0 1
    CPU1 attaching sched-domain:
    domain 0: span 0-1 level MC
    groups: 1 0
    NET: Registered protocol family 16
    ACPI FADT declares the system doesn't support PCIe ASPM, so disable it
    ACPI: bus type pci registered
    PCI: MCFG configuration 0: base f8000000 segment 0 buses 0 - 63
    PCI: Not using MMCONFIG.
    PCI: Using configuration type 1 for base access
    bio: create slab <bio-0> at 0
    ACPI: EC: Enabling special treatment for EC from MSI.
    ACPI: EC: Look up EC in DSDT
    ACPI: EC: non-query interrupt received, switching to interrupt mode
    ACPI: Interpreter enabled
    ACPI: (supports S0 S3 S4 S5)
    ACPI: Using IOAPIC for interrupt routing
    PCI: MCFG configuration 0: base f8000000 segment 0 buses 0 - 63
    PCI: MCFG area at f8000000 reserved in ACPI motherboard resources
    PCI: Using MMCONFIG at f8000000 - fbffffff
    ACPI: EC: GPE = 0x16, I/O: command/status = 0x66, data = 0x62
    ACPI: EC: driver started in interrupt mode
    ACPI: Power Resource [C29F] (on)
    ACPI: Power Resource [C1C7] (off)
    ACPI: Power Resource [C3AD] (off)
    ACPI: Power Resource [C3B0] (off)
    ACPI: Power Resource [C3C3] (off)
    ACPI: Power Resource [C3C4] (off)
    ACPI: Power Resource [C3C5] (off)
    ACPI: Power Resource [C3C6] (off)
    ACPI: Power Resource [C3C7] (off)
    ACPI: No dock devices found.
    ACPI: PCI Root Bridge [C003] (0000:00)
    pci 0000:00:02.0: reg 10 64bit mmio: [0xe0400000-0xe04fffff]
    pci 0000:00:02.0: reg 18 64bit mmio: [0xd0000000-0xdfffffff]
    pci 0000:00:02.0: reg 20 io port: [0x2000-0x2007]
    pci 0000:00:02.1: reg 10 64bit mmio: [0xe0500000-0xe05fffff]
    pci 0000:00:03.0: reg 10 64bit mmio: [0xe0600000-0xe060000f]
    pci 0000:00:03.0: PME# supported from D0 D3hot D3cold
    pci 0000:00:03.0: PME# disabled
    pci 0000:00:03.2: reg 10 io port: [0x2008-0x200f]
    pci 0000:00:03.2: reg 14 io port: [0x2010-0x2013]
    pci 0000:00:03.2: reg 18 io port: [0x2018-0x201f]
    pci 0000:00:03.2: reg 1c io port: [0x2020-0x2023]
    pci 0000:00:03.2: reg 20 io port: [0x2030-0x203f]
    pci 0000:00:03.3: reg 10 io port: [0x2040-0x2047]
    pci 0000:00:03.3: reg 14 32bit mmio: [0xe0601000-0xe0601fff]
    pci 0000:00:19.0: reg 10 32bit mmio: [0xe0620000-0xe063ffff]
    pci 0000:00:19.0: reg 14 32bit mmio: [0xe0640000-0xe0640fff]
    pci 0000:00:19.0: reg 18 io port: [0x2060-0x207f]
    pci 0000:00:19.0: PME# supported from D0 D3hot D3cold
    pci 0000:00:19.0: PME# disabled
    pci 0000:00:1a.0: reg 20 io port: [0x2080-0x209f]
    pci 0000:00:1a.1: reg 20 io port: [0x20a0-0x20bf]
    pci 0000:00:1a.7: reg 10 32bit mmio: [0xe0641000-0xe06413ff]
    pci 0000:00:1a.7: PME# supported from D0 D3hot D3cold
    pci 0000:00:1a.7: PME# disabled
    pci 0000:00:1b.0: reg 10 64bit mmio: [0xe0644000-0xe0647fff]
    pci 0000:00:1b.0: PME# supported from D0 D3hot D3cold
    pci 0000:00:1b.0: PME# disabled
    pci 0000:00:1c.0: PME# supported from D0 D3hot D3cold
    pci 0000:00:1c.0: PME# disabled
    pci 0000:00:1c.1: PME# supported from D0 D3hot D3cold
    pci 0000:00:1c.1: PME# disabled
    pci 0000:00:1d.0: reg 20 io port: [0x20c0-0x20df]
    pci 0000:00:1d.1: reg 20 io port: [0x20e0-0x20ff]
    pci 0000:00:1d.2: reg 20 io port: [0x2100-0x211f]
    pci 0000:00:1d.7: reg 10 32bit mmio: [0xe0648000-0xe06483ff]
    pci 0000:00:1d.7: PME# supported from D0 D3hot D3cold
    pci 0000:00:1d.7: PME# disabled
    pci 0000:00:1f.0: quirk: region 1000-107f claimed by ICH6 ACPI/GPIO/TCO
    pci 0000:00:1f.0: quirk: region 1100-113f claimed by ICH6 GPIO
    pci 0000:00:1f.0: ICH7 LPC Generic IO decode 1 PIO at 0500 (mask 007f)
    pci 0000:00:1f.0: ICH7 LPC Generic IO decode 4 PIO at 02e8 (mask 0007)
    pci 0000:00:1f.1: reg 10 io port: [0x00-0x07]
    pci 0000:00:1f.1: reg 14 io port: [0x00-0x03]
    pci 0000:00:1f.1: reg 18 io port: [0x00-0x07]
    pci 0000:00:1f.1: reg 1c io port: [0x00-0x03]
    pci 0000:00:1f.1: reg 20 io port: [0x2120-0x212f]
    pci 0000:10:00.0: reg 10 64bit mmio: [0xe0000000-0xe0001fff]
    pci 0000:10:00.0: PME# supported from D0 D3hot D3cold
    pci 0000:10:00.0: PME# disabled
    pci 0000:00:1c.1: bridge 32bit mmio: [0xe0000000-0xe00fffff]
    pci 0000:02:06.0: reg 10 32bit mmio: [0xe0100000-0xe0100fff]
    pci 0000:02:06.0: supports D1 D2
    pci 0000:02:06.0: PME# supported from D0 D1 D2 D3hot D3cold
    pci 0000:02:06.0: PME# disabled
    pci 0000:02:06.1: reg 10 32bit mmio: [0xe0101000-0xe01017ff]
    pci 0000:02:06.1: supports D1 D2
    pci 0000:02:06.1: PME# supported from D0 D1 D2 D3hot D3cold
    pci 0000:02:06.1: PME# disabled
    pci 0000:02:06.2: reg 10 32bit mmio: [0xe0102000-0xe01020ff]
    pci 0000:02:06.2: supports D1 D2
    pci 0000:02:06.2: PME# supported from D0 D1 D2 D3hot D3cold
    pci 0000:02:06.2: PME# disabled
    pci 0000:02:06.3: reg 10 32bit mmio: [0xe0103000-0xe01030ff]
    pci 0000:02:06.3: supports D1 D2
    pci 0000:02:06.3: PME# supported from D0 D1 D2 D3hot D3cold
    pci 0000:02:06.3: PME# disabled
    pci 0000:00:1e.0: transparent bridge
    pci 0000:00:1e.0: bridge 32bit mmio: [0xe0100000-0xe03fffff]
    pci_bus 0000:00: on NUMA node 0
    ACPI: PCI Interrupt Routing Table [\_SB_.C003._PRT]
    ACPI: PCI Interrupt Routing Table [\_SB_.C003.C0B2._PRT]
    ACPI: PCI Interrupt Routing Table [\_SB_.C003.C11F._PRT]
    ACPI: PCI Interrupt Routing Table [\_SB_.C003.C133._PRT]
    ACPI: PCI Interrupt Link [C12F] (IRQs *10 11)
    ACPI: PCI Interrupt Link [C130] (IRQs *10 11)
    ACPI: PCI Interrupt Link [C131] (IRQs 10 *11)
    ACPI: PCI Interrupt Link [C132] (IRQs 10 11) *5
    ACPI: PCI Interrupt Link [C142] (IRQs *10 11)
    ACPI: PCI Interrupt Link [C143] (IRQs 10 11) *0, disabled.
    ACPI: PCI Interrupt Link [C144] (IRQs 10 *11)
    ACPI Exception: AE_NOT_FOUND, Evaluating _PRS 20090521 pci_link-182
    usbcore: registered new interface driver usbfs
    usbcore: registered new interface driver hub
    usbcore: registered new device driver usb
    PCI: Using ACPI for IRQ routing
    hpet0: at MMIO 0xfed00000, IRQs 2, 8, 0
    hpet0: 3 comparators, 64-bit 14.318180 MHz counter
    pnp: PnP ACPI init
    ACPI: bus type pnp registered
    pnp: PnP ACPI: found 14 devices
    ACPI: ACPI bus type pnp unregistered
    system 00:00: iomem range 0x0-0x9ffff could not be reserved
    system 00:00: iomem range 0xe0000-0xfffff could not be reserved
    system 00:00: iomem range 0x100000-0x7e7fffff could not be reserved
    system 00:0a: ioport range 0x500-0x55f has been reserved
    system 00:0a: ioport range 0x800-0x80f has been reserved
    system 00:0a: iomem range 0xffb00000-0xffbfffff has been reserved
    system 00:0a: iomem range 0xfff00000-0xffffffff has been reserved
    system 00:0c: ioport range 0x4d0-0x4d1 has been reserved
    system 00:0c: ioport range 0x2f8-0x2ff has been reserved
    system 00:0c: ioport range 0x3f8-0x3ff has been reserved
    system 00:0c: ioport range 0x1000-0x107f has been reserved
    system 00:0c: ioport range 0x1100-0x113f has been reserved
    system 00:0c: ioport range 0x1200-0x121f has been reserved
    system 00:0c: iomem range 0xf8000000-0xfbffffff has been reserved
    system 00:0c: iomem range 0xfec00000-0xfec000ff could not be reserved
    system 00:0c: iomem range 0xfed20000-0xfed3ffff has been reserved
    system 00:0c: iomem range 0xfed45000-0xfed8ffff has been reserved
    system 00:0c: iomem range 0xfed90000-0xfed99fff has been reserved
    system 00:0d: iomem range 0xcee00-0xcffff has been reserved
    system 00:0d: iomem range 0xd2000-0xd3fff has been reserved
    system 00:0d: iomem range 0xfeda0000-0xfedbffff has been reserved
    system 00:0d: iomem range 0xfee00000-0xfee00fff has been reserved
    pci 0000:00:1c.0: PCI bridge, secondary bus 0000:08
    pci 0000:00:1c.0: IO window: disabled
    pci 0000:00:1c.0: MEM window: disabled
    pci 0000:00:1c.0: PREFETCH window: disabled
    pci 0000:00:1c.1: PCI bridge, secondary bus 0000:10
    pci 0000:00:1c.1: IO window: disabled
    pci 0000:00:1c.1: MEM window: 0xe0000000-0xe00fffff
    pci 0000:00:1c.1: PREFETCH window: disabled
    pci 0000:02:06.0: CardBus bridge, secondary bus 0000:03
    pci 0000:02:06.0: IO window: 0x003000-0x0030ff
    pci 0000:02:06.0: IO window: 0x003400-0x0034ff
    pci 0000:02:06.0: PREFETCH window: 0x80000000-0x83ffffff
    pci 0000:02:06.0: MEM window: 0x84000000-0x87ffffff
    pci 0000:00:1e.0: PCI bridge, secondary bus 0000:02
    pci 0000:00:1e.0: IO window: 0x3000-0x3fff
    pci 0000:00:1e.0: MEM window: 0xe0100000-0xe03fffff
    pci 0000:00:1e.0: PREFETCH window: 0x80000000-0x83ffffff
    pci 0000:00:1c.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
    pci 0000:00:1c.0: setting latency timer to 64
    pci 0000:00:1c.1: PCI INT B -> GSI 17 (level, low) -> IRQ 17
    pci 0000:00:1c.1: setting latency timer to 64
    pci 0000:00:1e.0: setting latency timer to 64
    pci 0000:02:06.0: PCI INT A -> GSI 18 (level, low) -> IRQ 18
    pci_bus 0000:00: resource 0 io: [0x00-0xffff]
    pci_bus 0000:00: resource 1 mem: [0x000000-0xffffffffffffffff]
    pci_bus 0000:10: resource 1 mem: [0xe0000000-0xe00fffff]
    pci_bus 0000:02: resource 0 io: [0x3000-0x3fff]
    pci_bus 0000:02: resource 1 mem: [0xe0100000-0xe03fffff]
    pci_bus 0000:02: resource 2 pref mem [0x80000000-0x83ffffff]
    pci_bus 0000:02: resource 3 io: [0x00-0xffff]
    pci_bus 0000:02: resource 4 mem: [0x000000-0xffffffffffffffff]
    pci_bus 0000:03: resource 0 io: [0x3000-0x30ff]
    pci_bus 0000:03: resource 1 io: [0x3400-0x34ff]
    pci_bus 0000:03: resource 2 pref mem [0x80000000-0x83ffffff]
    pci_bus 0000:03: resource 3 mem: [0x84000000-0x87ffffff]
    [...]
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