Re: [OE-core] [PATCH] kernel: provide module.lds for out of tree builds in v5.10+

["Scott Branden" <scott.branden@broadcom.com>]

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Sorry, spoke too soon.  Doesn't seem to work from a clean build now.

On 2020-11-13 9:53 a.m., Scott Branden wrote:
> Thanks, works for me building external kernel modules.
>
> On 2020-11-12 10:32 p.m., Bruce Ashfield wrote:
>> From: Bruce Ashfield <bruce.ashfield@gmail.com>
>>
>> The upstream commit 596b0474d3d [kbuild: preprocess module linker
>> script], adds a dependency on module.lds for external module
>> building.
>>
>> Since module.lds is generated as part of 'modules_prepare', we
>> must make it available with the other kernel artifacts in the
>> kernel shared workdir, otherwise out of tree builds fail.
>>
>> This fixes errors like:
>>
>>     | make[4]: *** No rule to make target 'scripts/module.lds', needed by
>>         'build/tmp/work/qemuarm64-poky-linux/cryptodev-module/1.11-r0/git/cryptodev.ko'.
>>         Stop.
>>     | make[4]: *** Waiting for unfinished jobs....
>>
>> We also ensure that kernel-devsrc has a copy to support on
>> target module builds that are often prepared with 'make scripts
>> prepare'. Those targets won't regenerate it, so the build fails.
>> If 'make modules_prepare' is used, the file will be regenerated
>> and overwrite our copy (as expected).
>>
>> Signed-off-by: Pan, Kris <kris.pan@intel.com>
>> Signed-off-by: Lili Li <lili.li@intel.com>
>> Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
> Tested-by: Scott Branden <scott.branden@broadcom.com>
>> ---
>>  meta/classes/kernel.bbclass                | 1 +
>>  meta/recipes-kernel/linux/kernel-devsrc.bb | 6 ++++++
>>  2 files changed, 7 insertions(+)
>>
>> diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
>> index be93a258f6..ccd74e61e8 100644
>> --- a/meta/classes/kernel.bbclass
>> +++ b/meta/classes/kernel.bbclass
>> @@ -494,6 +494,7 @@ do_shared_workdir () {
>>  	# Copy files required for module builds
>>  	cp System.map $kerneldir/System.map-${KERNEL_VERSION}
>>  	[ -e Module.symvers ] && cp Module.symvers $kerneldir/
>> +	[ -e scripts/module.lds ] && install -Dm 0644 scripts/module.lds $kerneldir/scripts/module.lds
>>  	cp .config $kerneldir/
>>  	mkdir -p $kerneldir/include/config
>>  	cp include/config/kernel.release $kerneldir/include/config/kernel.release
>> diff --git a/meta/recipes-kernel/linux/kernel-devsrc.bb b/meta/recipes-kernel/linux/kernel-devsrc.bb
>> index 81b1e36041..5f0dedbdf7 100644
>> --- a/meta/recipes-kernel/linux/kernel-devsrc.bb
>> +++ b/meta/recipes-kernel/linux/kernel-devsrc.bb
>> @@ -100,6 +100,12 @@ do_install() {
>>  	# be dealt with.
>>  	# cp -a scripts $kerneldir/build
>>  
>> +	# although module.lds can be regenerated on target via 'make modules_prepare'
>> +	# there are several places where 'makes scripts prepare' is done, and that won't
>> +	# regenerate the file. So we copy it onto the target as a migration to using
>> +	# modules_prepare
>> +	cp -a --parents scripts/module.lds $kerneldir/build/ 2>/dev/null || :
>> +
>>          if [ -d arch/${ARCH}/scripts ]; then
>>  	    cp -a arch/${ARCH}/scripts $kerneldir/build/arch/${ARCH}
>>  	fi
>>
>> 
>>
>


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