[Linux-kernel-mentees] [PATCH] kconfig: Prepend interpeters when calling scripts

Ujjwal Kumar ujjwalkumar0501 at gmail.com
Sat Sep 26 09:23:35 UTC 2020


On 26/09/20 11:24 am, Lukas Bulwahn wrote:
> 
> 
> On Sat, 26 Sep 2020, Ujjwal Kumar wrote:
>>
>> To unset the executable bit I ran following command:
>> for i in $(find -executable -type f); do chmod -x $i; done
>>
>> One thing that I noticed is, once we initiate a kernel build some 
>> programs are compiled and removing their executable bit is not desirable.
>> Even after performing "make clean" some of those programs still persist and 
>> removing their executable bit fails any further attempt to build the kernel.
>>
>> For instance, tools/objtool/objtool file. In my case I had a total of 19 
>> files remaining after performing make clean.
>>
> 
> Good observation.
> 
> You can properly clean your build with make mrproper, but maybe that is 
> not even enough... all generated files might not mean _all generated 
> tools_, such as objtool, etc.
> 
> $ make help
> 
> Cleaning targets:
>   clean		  - Remove most generated files but keep the config and
>                     enough build support to build external modules
>   mrproper	  - Remove all generated files + config + various backup files
>   distclean	  - mrproper + remove editor backup and patch files
> 
> [...]
> 
> After for i in $(find -executable -type f); do chmod -x $i; done:
> I saw those failures (probably as you did as well):

Yes these are the same errors that I received.

> 
> *** Default configuration is based on 'x86_64_defconfig'
> sh: 1: ./scripts/gcc-version.sh: Permission denied
> init/Kconfig:34: syntax error
> init/Kconfig:33: invalid statement
> init/Kconfig:34: invalid statement
> sh: 1: ./scripts/ld-version.sh: Permission denied
> init/Kconfig:39: syntax error
> init/Kconfig:38: invalid statement
> sh: 1: ./scripts/clang-version.sh: Permission denied
> init/Kconfig:49: syntax error
> init/Kconfig:48: invalid statement
> scripts/kconfig/Makefile:80: recipe for target 'defconfig' failed
> make[1]: *** [defconfig] Error 1
> Makefile:606: recipe for target 'defconfig' failed
> make: *** [defconfig] Error 2
> 
> 
> After your patch was applied, they disappear. So, it does the job.
> More comments on the patch itself later.
> 
> make defconfig works.
> 

Yes, these errors appeared when we unset executable bits on files after 
performing 'make clean' and then perform a kernel build.

> make then fails:
> 
> HOSTCC   /home/lukas/repositories/kernel.org/pub/scm/linux/kernel/git/torvalds/linux/tools/objtool/fixdep.o
> /bin/sh: 1: /home/lukas/repositories/kernel.org/pub/scm/linux/kernel/git/torvalds/linux/tools/objtool//fixdep: Permission denied
> /home/lukas/repositories/kernel.org/pub/scm/linux/kernel/git/torvalds/linux/tools/build/Makefile.build:96: recipe for target 
> '/home/lukas/repositories/kernel.org/pub/scm/linux/kernel/git/torvalds/linux/tools/objtool/fixdep.o' failed
> make[4]: *** [/home/lukas/repositories/kernel.org/pub/scm/linux/kernel/git/torvalds/linux/tools/objtool/fixdep.o] Error 126
> Makefile:43: recipe for target '/home/lukas/repositories/kernel.org/pub/scm/linux/kernel/git/torvalds/linux/tools/objtool/fixdep-in.o' failed
> make[3]: *** [/home/lukas/repositories/kernel.org/pub/scm/linux/kernel/git/torvalds/linux/tools/objtool/fixdep-in.o] Error 2
> /home/lukas/repositories/kernel.org/pub/scm/linux/kernel/git/torvalds/linux/tools/build/Makefile.include:5: recipe for target 'fixdep' failed
> make[2]: *** [fixdep] Error 2
> Makefile:68: recipe for target 'objtool' failed
> make[1]: *** [objtool] Error 2
> Makefile:1885: recipe for target 'tools/objtool' failed
> make: *** [tools/objtool] Error 2
> make: *** Waiting for unfinished jobs....
> 
> The make target also goes into tools/build/ and requires some targets 
> there and then uses those tools during the further build.
> 
> So, we need some more patches here as well.
> 
> Can you share the list of 19 files that remained even with make clean?
> 

After performing a make clean, the files that persist are:
./tools/objtool/objtool
./tools/objtool/fixdep
./scripts/sorttable
./scripts/mod/mk_elfconfig
./scripts/mod/modpost
./scripts/unifdef
./scripts/basic/fixdep
./scripts/bin2c
./scripts/extract-cert
./scripts/kconfig/conf
./scripts/selinux/mdp/mdp
./scripts/selinux/genheaders/genheaders
./scripts/asn1_compiler
./scripts/kallsyms
./scripts/sign-file
./scripts/genksyms/genksyms
./scripts/recordmcount
./scripts/insert-sys-cert
./scripts/dtc/dtc

After performing 'make mrproper'/'make distclean' the files that persist 
are:
./tools/objtool/objtool
./tools/objtool/fixdep

> Then, we go through them and check if they disappear with make mrproper or 
> with a different make target to clean them. Potentially, we also hook 
> those identified targets up into make mrproper then.

Is it appropriate to include the files here: 
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/Makefile?h=next-20200925#n1466
?
Or should it be included inside tools/objtool/Makefile here:
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/tools/objtool/Makefile?h=next-20200925#n78
?
In the second link, it appears to me that the files are already included for 
clean task but still they are not cleaned.

>> Lukas
> 

Thanks
Ujjwal Kumar


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