[OE-core] [PATCH v2] kernel-devsrc: restructure for out of tree (and on target) module builds

[Khem Raj]

On 7/12/18 7:55 AM, Bruce Ashfield wrote:
> On 2018-07-12 9:53 AM, Richard Purdie wrote:
>> On Thu, 2018-07-12 at 09:49 -0400, Bruce Ashfield wrote:
>>> On 2018-07-10 5:41 PM, Richard Purdie wrote:
>>>> On Tue, 2018-07-10 at 12:38 -0400, Bruce Ashfield wrote:
>>>>> On 07/10/2018 06:21 AM, Richard Purdie wrote:
>>>>>> On Mon, 2018-07-09 at 11:53 -0400, Bruce Ashfield wrote:
>>>>>
>>>>> I'll try the other configs, but clearly I have something
>>>>> different in
>>>>> my x86-64 build.
>>>>>
>>>>> I can't run the self tests directly, but am copying the files
>>>>> onto my
>>>>> qemu session and running things myself:
>>>>>
>>>>> root at qemux86-64:/lib/modules/4.14.48-yocto-standard/build# make
>>>>> ARCH=x86
>>>>> scripts prepare
>>>>> Makefile:950: "Cannot use CONFIG_STACK_VALIDATION=y, please
>>>>> install
>>>>> libelf-dev, libelf-devel or elfutils-libelf-devel"
>>>>>      CHK     scripts/mod/devicetable-offsets.h
>>>>>      SYSTBL  arch/x86/include/generated/asm/syscalls_32.h
>>>>>      SYSHDR  arch/x86/include/generated/asm/unistd_32_ia32.h
>>>>>      SYSHDR  arch/x86/include/generated/asm/unistd_64_x32.h
>>>>>      SYSTBL  arch/x86/include/generated/asm/syscalls_64.h
>>>>>      SYSHDR  arch/x86/include/generated/uapi/asm/unistd_32.h
>>>>>      SYSHDR  arch/x86/include/generated/uapi/asm/unistd_64.h
>>>>>      SYSHDR  arch/x86/include/generated/uapi/asm/unistd_x32.h
>>>>>      HOSTCC  arch/x86/tools/relocs_32.o
>>>>>      HOSTCC  arch/x86/tools/relocs_64.o
>>>>>      HOSTCC  arch/x86/tools/relocs_common.o
>>>>>      HOSTLD  arch/x86/tools/relocs
>>>>>      CHK     include/config/kernel.release
>>>>>      CHK     include/generated/uapi/linux/version.h
>>>>>      CHK     include/generated/utsrelease.h
>>>>> Makefile:950: "Cannot use CONFIG_STACK_VALIDATION=y, please
>>>>> install
>>>>> libelf-dev, libelf-devel or elfutils-libelf-devel"
>>>>>
>>>>> root at qemux86-64:/tmp# make
>>>>> make -C /usr/src/kernel M=/tmp modules
>>>>> make[1]: Entering directory '/lib/modules/4.14.48-yocto-
>>>>> standard/build'
>>>>> Makefile:950: "Cannot use CONFIG_STACK_VALIDATION=y, please
>>>>> install
>>>>> libelf-dev, libelf-devel or elfutils-libelf-devel"
>>>>>      Building modules, stage 2.
>>>>>      MODPOST 1 modules
>>>>> make[1]: Leaving directory '/lib/modules/4.14.48-yocto-
>>>>> standard/build'
>>>>> root at qemux86-64:/tmp# insmod hellomod.ko
>>>>> [  419.211616] hellomod: loading out-of-tree module taints
>>>>> kernel.
>>>>> [  419.212586] Hello world!
>>>>>
>>>>> This is on the core-image-kernel-dev image, which is the one that
>>>>> I created to test all this.
>>>>>
>>>>> What image is that using ? some sato sdk one ?
>>>>
>>>> We really need to find you a way to run these. The problem is the
>>>> qemu
>>>> graphics piece? You can't have a dummy vncserver or something to
>>>> direct
>>>> them at?
>>>>
>>>> The image is a core-image-sato-sdk...
>>>
>>> I was able to trigger the objtool issue with this image, looking at
>>> fixing it and the other arches now.
>>
>> Since its image related, is it a missing package dependency? Just
>> curious why its happening with some images but not your test ones...
> 
> It is. I have extra toolchain elements being installed in
> core-image-kernel-dev
> that hold things together (i.e. the kernel's objtool doesn't need to
> be built).
> 
> The obvious fix is to just add an RDEPENDS, but I'm being stubborn
> and trying to make it build on target, since the build of objtool from
> the kernel source is showing me some sort of include path issue that
> I'd like to sort out:
> 
>   CC /lib/modules/4.14.48-yocto-standard/build/tools/objtool/exec-cmd.o
> exec-cmd.c: In function 'get_pwd_cwd':
> exec-cmd.c:49:4: error: implicit declaration of function 'strlcpy'; did
> you mean 'strncpy'? [-Werror=implicit-function-declaration]
>     strlcpy(cwd, pwd, PATH_MAX);
>     ^~~~~~~
>     strncpy
> exec-cmd.c:49:4: error: nested extern declaration of 'strlcpy'
> [-Werror=nested-externs]
> cc1: all warnings being treated as errors
> 

Kernel has this function defined in tools/include/linux/string.h so

however it has it like this

#if defined(__GLIBC__) && !defined(__UCLIBC__)
extern size_t strlcpy(char *dest, const char *src, size_t size);
#endif

Which means it will not work for musl and we need to ensure that we
use -D_GNU_SOURCE for it to be included from standard musl headers


> Cheers,
> 
> Bruce
> 
>>
>> Cheers,
>>
>> Richard
>>
> 


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