linux-kernel - Re: [PATCH] kbuild: Add missing $(objtree) prefix to powerpc crtsavres.o artifact

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Message-ID: <d0eb6abf-c0f2-4726-92ea-7d007813936d@efficios.com>
Date: Tue, 28 Jan 2025 10:53:42 -0500
From: Kienan Stewart <kstewart@...icios.com>
To: Madhavan Srinivasan <maddy@...ux.ibm.com>,
 Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>,
 Christophe Leroy <christophe.leroy@...roup.eu>,
 Naveen N Rao <naveen@...nel.org>, Masahiro Yamada <masahiroy@...nel.org>,
 Nicolas Schier <nicolas@...sle.org>, Nathan Chancellor <nathan@...nel.org>
Cc: linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
 linux-kbuild@...r.kernel.org
Subject: Re: [PATCH] kbuild: Add missing $(objtree) prefix to powerpc
 crtsavres.o artifact

Hi,

I missed a few CCs, looping them in now. Apologies for the extra noise.

thanks,
kienan

On 1/27/25 1:47 PM, Kienan Stewart wrote:
> In the upstream commit 214c0eea43b2ea66bcd6467ea57e47ce8874191b
> ("kbuild: add $(objtree)/ prefix to some in-kernel build artifacts")
> artifacts required for building out-of-tree kernel modules had
> $(objtree) prepended to them to prepare for building in other
> directories.
> 
> When building external modules for powerpc,
> arch/powerpc/lib/crtsavres.o is required for certain
> configurations. This artifact is missing the prepended $(objtree).
> 
> External modules may work around this omission for v6.13 by setting MO=$KDIR.
> 
> Signed-off-by: Kienan Stewart <kstewart@...icios.com>
> ---
>   arch/powerpc/Makefile | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
> index f3804103c56ccfdb16289468397ccaea71bf721e..9933b98df69d7f7b9aaf33d36155cc61ab4460c7 100644
> --- a/arch/powerpc/Makefile
> +++ b/arch/powerpc/Makefile
> @@ -58,7 +58,7 @@ ifeq ($(CONFIG_PPC64)$(CONFIG_LD_IS_BFD),yy)
>   # There is a corresponding test in arch/powerpc/lib/Makefile
>   KBUILD_LDFLAGS_MODULE += --save-restore-funcs
>   else
> -KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
> +KBUILD_LDFLAGS_MODULE += $(objtree)/arch/powerpc/lib/crtsavres.o
>   endif
>   
>   ifdef CONFIG_CPU_LITTLE_ENDIAN
> 
> ---
> base-commit: ffd294d346d185b70e28b1a28abe367bbfe53c04
> change-id: 20250127-buildfix-extmod-powerpc-a744e1331f83
> 
> Best regards,