Re: [PATCH 1/5] linux-module: Use debug-prefix-map to build modules deterministically

["MOESSBAUER, Felix" <felix.moessbauer@siemens.com>]

On Thu, 2023-12-07 at 21:11 +0530, venkata.pyla@toshiba-tsip.com wrote:
> From: venkata pyla <venkata.pyla@toshiba-tsip.com>
> 
> The custom linux modules are built non-determinstically due to the
> reason that the kernel build includes absolute paths in the debug
> information which is not necessary and can be trimmed using
> `debug-prefix-map` option.
> 
> Signed-off-by: venkata pyla <venkata.pyla@toshiba-tsip.com>

Hi, 

thanks for this. It is basically the same patch I send a year ago for
the kernel recipe.

@Maintainers: This patch needs to be serialized with this one:
"add support for non-default modules dir in linux-module".

Acked-by: Felix Moessbauer <felix.moessbauer@siemens.com>

Best regards,
Felix

> ---
>  meta/recipes-kernel/linux-module/files/debian/rules.tmpl | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/meta/recipes-kernel/linux-module/files/debian/rules.tmpl
> b/meta/recipes-kernel/linux-module/files/debian/rules.tmpl
> index 7d950e38..20d5f670 100755
> --- a/meta/recipes-kernel/linux-module/files/debian/rules.tmpl
> +++ b/meta/recipes-kernel/linux-module/files/debian/rules.tmpl
> @@ -45,11 +45,14 @@ KERNEL_DEP := $(shell dpkg-query -W -f
> '$${Depends}' ${KERNEL_HEADERS_PKG} | sed
>  KDIR := $(shell dpkg -L $(KERNEL_DEP) | grep
> "/lib/modules/.*/build")
>  endif
>  
> +KCFLAGS := "-fdebug-prefix-map=$(PWD)=."
> +KAFLAGS := "-fdebug-prefix-map=$(PWD)=."
> +
>  override_dh_auto_clean:
>         $(MAKE) -C $(KDIR) M=$(PWD) clean
>  
>  override_dh_auto_build:
> -       $(MAKE) -C $(KDIR) M=$(PWD) $(PARALLEL_MAKE) modules
> +       $(MAKE) -C $(KDIR) M=$(PWD) $(PARALLEL_MAKE)
> KCFLAGS="$(KCFLAGS)" KAFLAGS="$(KAFLAGS)" modules
>  ifneq ($(filter pkg.sign,$(DEB_BUILD_PROFILES)),)
>         find . -name "*.ko" -print -exec $(KDIR)/scripts/sign-file
> ${SIGNATURE_HASHFN} ${SIGNATURE_KEYFILE} ${SIGNATURE_CERTFILE} {} \;
>  endif