linux-kernel - Re: [PATCH] powerpc/Makefile: use $(objtree) for crtsavres.o

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Message-ID: <2fa11e77-0844-4432-8514-0d1e1b2222c9@csgroup.eu>
Date: Mon, 22 Sep 2025 15:08:26 +0200
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: "A. Sverdlin" <alexander.sverdlin@...mens.com>,
 linuxppc-dev@...ts.ozlabs.org
Cc: Madhavan Srinivasan <maddy@...ux.ibm.com>,
 Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>,
 linux-kernel@...r.kernel.org, Peter Marko <peter.marko@...mens.com>,
 stable@...r.kernel.org
Subject: Re: [PATCH] powerpc/Makefile: use $(objtree) for crtsavres.o



Le 19/09/2025 à 14:14, A. Sverdlin a écrit :
> [Vous ne recevez pas souvent de courriers de alexander.sverdlin@...mens.com. Découvrez pourquoi ceci est important à https://aka.ms/LearnAboutSenderIdentification ]
> 
> From: Alexander Sverdlin <alexander.sverdlin@...mens.com>
> 
> ... otherwise it could be problematic to build external modules:
> 
> make[2]: Entering directory '.../kernel-module-hello-world'
> |   CC [M]  hello-world.o
> |   MODPOST Module.symvers
> |   CC [M]  hello-world.mod.o
> |   CC [M]  .module-common.o
> |   LD [M]  hello-world.ko
> | powerpc-poky-linux-ld.bfd: cannot find arch/powerpc/lib/crtsavres.o: No such file or directory
> 
> Fixes: da3de6df33f5 ("[POWERPC] Fix -Os kernel builds with newer gcc versions")
> Cc: stable@...r.kernel.org
> Signed-off-by: Alexander Sverdlin <alexander.sverdlin@...mens.com>

This change is already done it seems, see 
https://patchwork.ozlabs.org/project/linuxppc-dev/patch/20250218-buildfix-extmod-powerpc-v2-1-1e78fcf12b56@efficios.com/

> ---
>   arch/powerpc/Makefile | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
> index 9753fb87217c3..a58b1029592ce 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
> --
> 2.51.0
>