Re: Issues while integrating backports(20150525) to target Kernel 3.1.10

[Bhuvanchandra DV <bhuvanchandradv@gmail.com>]

Hello Hauke,

On 06/04/2015 12:01 AM, Hauke Mehrtens wrote:

> On 06/02/2015 02:11 PM, Bhuvan wrote:
>> Hello,
>>
>> I'm trying to integrate backports(20150525) to target Kernel 3.1.10.
>> Followed the instructions available in the backports wiki for kernel
>> integration procedure. Nice! documentation.
>> Used linux-next.git, backports.git with next-20150525 and
>> backports-20150525 tags respectively.
>> The target Linux kernel version is based on NVIDIA's L4T and it was not
>> a clean 3.1 baseline but
>> rather some pre 3.2 version with further Android additions.
>> My aim is to backport the iwlwifi drivers on 3.1.10 kernel.
>>
>> Backporting 20150525 on 3.1.10 using gentree.py was not successful:
>>
>> # ./gentree.py --integrate --clean --gitdebug --git-revision
>> next-20150525 ../linux-next ~/linux
>> Get original source files from git ...
>> Applying patches from patches to ~/backports ...
>> Modify Kconfig tree ...
>> Rewrite Makefiles and Kconfig files ...
>> Applying patches from integration-patches/ to ~/linux ...
>> Failed to apply changes from
>> 001-enable-backports/0001-enable-backports-built-in.patch
>>> patching file Makefile
>>> Hunk #1 succeeded at 506 (offset -36 lines).
>>> Hunk #2 succeeded at 713 (offset -108 lines).
>>> Hunk #3 FAILED at 841.
>>> 1 out of 3 hunks FAILED -- saving rejects to file Makefile.rej
>> Traceback (most recent call last):
>>    File "./gentree.py", line 1091, in <module>
>>      ret = _main()
>>    File "./gentree.py", line 724, in _main
>>      logwrite=logwrite)
>>    File "./gentree.py", line 1078, in process
>>      bpid.project_dir, logwrite)
>>    File "./gentree.py", line 552, in apply_patches
>>      raise Exception('Patch failed')
>> Exception: Patch failed
>> ....
>>
>> Makefile.ref :
>>
>> --- Makefile
>> +++ Makefile
>> @@ -841,7 +845,7 @@ libs-y        := $(libs-y1) $(libs-y2)
>>
>>   # Externally visible symbols (used by link-vmlinux.sh)
>>   export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
>> -export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
>> +export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
>> $(backports-y)
>>   export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
>>   export LDFLAGS_vmlinux
>>   # used by scripts/pacmage/Makefile
>>
>> Am i missing some thing or doing some thing wrong!.
>> Can some one provide few pointers for fixing the issues and few pointers
>> on backporting kernel integration
>> on non standard kernel trees, like the one which i am working on.
>>
>> Best regards,
>> Bhuvan
> I think the documentation is not so good. ;-)
>
> If you just want to compile the drivers against your kernel the easiest
> way is to download the tar from here:
> http://www.kernel.org/pub/linux/kernel/projects/backports/2015/05/25/backports-20150525.tar.xz
>
> You can compile it against your kernel like any other external kernel
> module.
> The git repository is only needed if you want to generate your own tar
> with the drivers form your kernel.

Thanks!
Compiled the iwlwifi drivers successfully with backports-3.11.8 with some small
change: KERNEL_VERSION(3,2,0) to KERNEL_VERSION(3,1,0) in backports-incluse/linux/export.h, found this fix in mailing list.
Tried with the later backport versions, but couldn't compile the drivers successfully for 3.1.10 kernel.


>
> Hauke
>
>
Best regards,
Bhuvan