src/patches/suse-2.6.27.31/patches.fixes/acpi_assure_unique_processor_proc_creation.patch

   1 From: Zhao Yakui <yakui.zhao@intel.com>
   2 Subject: ACPI: Rename ACPI processor device bus ID
   3 References: bnc#528769
   4 Patch-Mainline: yes
   5 Commit-ID: 7a04b8491a077471a34938b8ca060c37220953be
   6
   7 Signed-off-by: Thomas Renninger <trenn@suse.de>
   8
   9 Some BIOS re-use the same processor bus id
  10 in different scope:
  11
  12         \_SB.SCK0.CPU0
  13         \_SB.SCK1.CPU0
  14
  15 But the (deprecated) /proc/acpi/ interface
  16 assumes the bus-id's are unique, resulting in an OOPS
  17 when the processor driver is loaded:
  18
  19 WARNING: at fs/proc/generic.c:590 proc_register+0x148/0x180()
  20 Hardware name: Sunrise Ridge
  21 proc_dir_entry 'processor/CPU0' already registered
  22 Call Trace:
  23  [<ffffffff8023f7ef>] warn_slowpath+0xb1/0xe5
  24  [<ffffffff8036243b>] ? ida_get_new_above+0x190/0x1b1
  25  [<ffffffff803625a8>] ? idr_pre_get+0x5f/0x75
  26  [<ffffffff8030b2f6>] proc_register+0x148/0x180
  27  [<ffffffff8030b4ff>] proc_mkdir_mode+0x3d/0x52
  28  [<ffffffff8030b525>] proc_mkdir+0x11/0x13
  29  [<ffffffffa0014b89>] acpi_processor_start+0x755/0x9bc [processor]
  30
  31 Rename the processor device bus id. And the new bus id will be
  32 generated as the following format:
  33         CPU+ CPU ID
  34
  35 For example: If the cpu ID is 5, then the bus ID will be "CPU5".
  36         If the CPU ID is 10, then the bus ID will be "CPUA".
  37
  38 Yes, this will change the directory names seen
  39 in /proc/acpi/processor/* on some systems.
  40 Before this patch, those directory names where
  41 totally arbitrary strings based on the interal AML device strings.
  42
  43 http://bugzilla.kernel.org/show_bug.cgi?id=13612
  44
  45 Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
  46 Signed-off-by: Len Brown <len.brown@intel.com>
  47
  48 ---
  49  drivers/acpi/processor_core.c |   11 ++++++++++-
  50  1 file changed, 10 insertions(+), 1 deletion(-)
  51
  52 --- a/drivers/acpi/processor_core.c
  53 +++ b/drivers/acpi/processor_core.c
  54 @@ -624,7 +624,16 @@ static int acpi_processor_get_info(struc
  55                         return -ENODEV;
  56                 }
  57         }
  58 -
  59 +       /*
  60 +        * On some boxes several processors use the same processor bus id.
  61 +        * But they are located in different scope. For example:
  62 +        * \_SB.SCK0.CPU0
  63 +        * \_SB.SCK1.CPU0
  64 +        * Rename the processor device bus id. And the new bus id will be
  65 +        * generated as the following format:
  66 +        * CPU+CPU ID.
  67 +        */
  68 +       sprintf(acpi_device_bid(device), "CPU%X", pr->id);
  69         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
  70                           pr->acpi_id));
  71