Issues while integrating backports(20150525) to target Kernel 3.1.10

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

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 :

@@ -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.

Hauke

Hello Hauke,

:-)

Agreed, but I'm using it for integrating the backport drivers with kernel instead of using them as kernel modules. Followed as per the instructions here: https://backports.wiki.kernel.org/index.php/Documentation/integration

Using the backport-20150525 tar, compilation fails:

Log:

|dvb|make defconfig-wifi []
Generating local configuration database from kernel ... done.
cc -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -c -o conf.o conf.c
cc -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -c -o zconf.tab.o zconf.tab.c
In file included from zconf.tab.c:2503:0:
menu.c: In function ‘get_symbol_str’:
menu.c:561:18: warning: ‘jump’ may be used uninitialized in this function [-Wmaybe-uninitialized]

     jump->offset = r->len - 1;
                  ^
In file included from zconf.tab.c:2503:0:
menu.c:515:19: note: ‘jump’ was declared here
  struct jump_key *jump;
                   ^

cc conf.o zconf.tab.o -o conf
boolean symbol HWMON tested for 'm'? test forced to 'n' boolean symbol HWMON tested for 'm'? test forced to 'n' #

# configuration written to .config
#
|dvb|make                                                                                                 []
make[5]: 'conf' is up to date.
boolean symbol HWMON tested for 'm'? test forced to 'n'
boolean symbol HWMON tested for 'm'? test forced to 'n'
#
# configuration written to .config
#
Building backport-include/backport/autoconf.h ... done.
  CC [M]  /home/bhuvan/backports-20150525/compat/main.o
/home/bhuvan/backports-20150525/compat/main.c:51:1: warning: data definition has no type or storage class [enabled by default]
/home/bhuvan/backports-20150525/compat/main.c:51:1: warning: type defaults to ‘int’ in declaration of ‘EXPORT_SYMBOL_GPL’ [-Wimplicit-int]
/home/bhuvan/backports-20150525/compat/main.c:51:1: warning: parameter names (without types) in function declaration [enabled by default]
  CC [M]  /home/bhuvan/backports-20150525/compat/backport-3.2.o
/home/bhuvan/backports-20150525/compat/backport-3.2.c:25:1: warning: data definition has no type or storage class [enabled by default]
/home/bhuvan/backports-20150525/compat/backport-3.2.c:25:1: warning: type defaults to ‘int’ in declaration of ‘EXPORT_SYMBOL_GPL’ [-Wimplicit-int]
/home/bhuvan/backports-20150525/compat/backport-3.2.c:25:1: warning: parameter names (without types) in function declaration [enabled by default]
  CC [M]  /home/bhuvan/backports-20150525/compat/compat-3.3.o
In file included from /home/bhuvan/backports-20150525/backport-include/linux/device.h:4:0,
                 from include/linux/dmaengine.h:24,
                 from include/linux/skbuff.h:30,
                 from /home/bhuvan/backports-20150525/backport-include/linux/skbuff.h:3,
                 from /home/bhuvan/backports-20150525/compat/compat-3.3.c:13:
include/linux/device.h: In function ‘root_device_register’:
include/linux/device.h:724:38: error: ‘THIS_MODULE’ undeclared (first use in this function)
include/linux/device.h:724:38: note: each undeclared identifier is reported only once for each function it appears in
/home/bhuvan/backports-20150525/compat/compat-3.3.c: At top level:
/home/bhuvan/backports-20150525/compat/compat-3.3.c:166:1: warning: data definition has no type or storage class [enabled by default]
/home/bhuvan/backports-20150525/compat/compat-3.3.c:166:1: warning: type defaults to ‘int’ in declaration of ‘EXPORT_SYMBOL_GPL’ [-Wimplicit-int]
/home/bhuvan/backports-20150525/compat/compat-3.3.c:166:1: warning: parameter names (without types) in function declaration [enabled by default]
/home/bhuvan/backports-20150525/compat/compat-3.3.c:206:1: warning: data definition has no type or storage class [enabled by default]
/home/bhuvan/backports-20150525/compat/compat-3.3.c:206:1: warning: type defaults to ‘int’ in declaration of ‘EXPORT_SYMBOL_GPL’ [-Wimplicit-int]
/home/bhuvan/backports-20150525/compat/compat-3.3.c:206:1: warning: parameter names (without types) in function declaration [enabled by default]
/home/bhuvan/backports-20150525/compat/compat-3.3.c:226:1: warning: data definition has no type or storage class [enabled by default]
/home/bhuvan/backports-20150525/compat/compat-3.3.c:226:1: warning: type defaults to ‘int’ in declaration of ‘EXPORT_SYMBOL_GPL’ [-Wimplicit-int]
/home/bhuvan/backports-20150525/compat/compat-3.3.c:226:1: warning: parameter names (without types) in function declaration [enabled by default]
/home/bhuvan/backports-20150525/compat/compat-3.3.c:239:1: warning: data definition has no type or storage class [enabled by default]
/home/bhuvan/backports-20150525/compat/compat-3.3.c:239:1: warning: type defaults to ‘int’ in declaration of ‘EXPORT_SYMBOL_GPL’ [-Wimplicit-int]
/home/bhuvan/backports-20150525/compat/compat-3.3.c:239:1: warning: parameter names (without types) in function declaration [enabled by default]
scripts/Makefile.build:305: recipe for target '/home/bhuvan/backports-20150525/compat/compat-3.3.o' failed
make[6]: *** [/home/bhuvan/backports-20150525/compat/compat-3.3.o] Error 1
scripts/Makefile.build:441: recipe for target '/home/bhuvan/backports-20150525/compat' failed
make[5]: *** [/home/bhuvan/backports-20150525/compat] Error 2
Makefile:1361: recipe for target '_module_/home/bhuvan/backports-20150525' failed
make[4]: *** [_module_/home/bhuvan/backports-20150525] Error 2
Makefile.build:6: recipe for target 'modules' failed
make[3]: *** [modules] Error 2
Makefile.real:88: recipe for target 'modules' failed
make[2]: *** [modules] Error 2
Makefile:40: recipe for target 'modules' failed
make[1]: *** [modules] Error 2
Makefile:30: recipe for target 'default' failed
make: *** [default] Error 2
...

CONFIG_MODULES is enabled in .config file

|dvb|cat /home/bhuvan/linux-tegra/.config|grep CONFIG_MODULE CONFIG_MODULES=y
# CONFIG_MODULE_FORCE_LOAD is not set CONFIG_MODULE_UNLOAD=y CONFIG_MODULE_FORCE_UNLOAD=y CONFIG_MODULE_SRCVERSION_ALL=y

Best regards,

Bhuvan

Hello Hauke,

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.

Best regards,
Bhuvan