Subject: Re: Problems with Kernels 3.17-rc1 and onwards on Acube Sam460 AMCC 460ex board

From: Julian Margetson <[email-masked]>
Date: Wed, 18 Feb 2015 16:13:59 -0400

On 2/15/2015 8:18 PM, Michael Ellerman wrote:
> On Sun, 2015-02-15 at 08:16 -0400, Julian Margetson wrote:
>> Hi
>>
>> I am unable to get any kernel beyond  the 3.16 branch working on an
>> Acube Sam460ex
>>   AMCC 460ex based motherboard. Kernel  up 3.16.7-ckt6 working.
> Does reverting b0345bbc6d09 change anything?
>
>> [    6.364350] snd_hda_intel 0001:81:00.1: enabling device (0000 -> 0002)
>> [    6.453794] snd_hda_intel 0001:81:00.1: ppc4xx_setup_msi_irqs: fail mapping irq
>> [    6.487530] Unable to handle kernel paging request for data at address 0x0fa06c7c
>> [    6.495055] Faulting instruction address: 0xc032202c
>> [    6.500033] Vector: 300 (Data Access) at [efa31cf0]
>> [    6.504922]     pc: c032202c: __reg_op+0xe8/0x100
>> [    6.509697]     lr: c0014f88: msi_bitmap_free_hwirqs+0x50/0x94
>> [    6.515600]     sp: efa31da0
>> [    6.518491]    msr: 21000
>> [    6.521112]    dar: fa06c7c
>> [    6.523915]  dsisr: 0
>> [    6.526190]   current = 0xef8bab00
>> [    6.529603]     pid   = 115, comm = kworker/0:1
>> [    6.534163] enter ? for help
>> [    6.537054] [link register   ] c0014f88 msi_bitmap_free_hwirqs+0x50/0x94
>> [    6.543811] [efa31da0] c0014f78 msi_bitmap_free_hwirqs+0x40/0x94 (unreliable)
>> [    6.551001] [efa31dc0] c001aee8 ppc4xx_setup_msi_irqs+0xac/0xf4
>> [    6.556973] [efa31e00] c03503a4 pci_enable_msi_range+0x1e0/0x280
>> [    6.563032] [efa31e40] f92c2f74 azx_probe_work+0xe0/0x57c [snd_hda_intel]
>> [    6.569906] [efa31e80] c0036344 process_one_work+0x1e8/0x2f0
>> [    6.575627] [efa31eb0] c003677c worker_thread+0x2f4/0x438
>> [    6.581079] [efa31ef0] c003a3e4 kthread+0xc8/0xcc
>> [    6.585844] [efa31f40] c000aec4 ret_from_kernel_thread+0x5c/0x64
>> [    6.591910] mon>  <no input ...>
> cheers
>
>
>
Managed to do a third git bisect  with the following results .

git bisect bad
9279d3286e10736766edcaf815ae10e00856e448 is the first bad commit
commit 9279d3286e10736766edcaf815ae10e00856e448
Author: Rasmus Villemoes<[email-masked]>
Date:   Wed Aug 6 16:10:16 2014 -0700

     lib: bitmap: change parameter of bitmap_*_region to unsigned
     
     Changing the pos parameter of __reg_op to unsigned allows the compiler
     to generate slightly smaller and simpler code.  Also update its callers
     bitmap_*_region to receive and pass unsigned int.  The return types of
     bitmap_find_free_region and bitmap_allocate_region are still int to
     allow a negative error code to be returned.  An int is certainly capable
     of representing any realistic return value.
     
     Signed-off-by: Rasmus Villemoes<[email-masked]>
     Signed-off-by: Andrew Morton<[email-masked]>
     Signed-off-by: Linus Torvalds<[email-masked]>

:040000 040000 4f560a7caaba2d05c146a3cea27e0d93739d950c c3d4539acad26667a2d78844ead7b75af753f41e M	include
:040000 040000 7a6fb894aac2a1d4e72f8e36b7c6de3c24509ad3 31d756da185e07d2de090c9e6aeb12689d58d310 M	lib