Re: [PATCH] powerpc: add crtsavres.o to always-y instead of extra-y

Nicholas Piggin
2023-11-21T00:51:49Z

On Tue Nov 21, 2023 at 9:23 AM AEST, Masahiro Yamada wrote:
> crtsavres.o is linked to modules. However, as explained in commit
> d0e628cd817f ("kbuild: doc: clarify the difference between extra-y
> and always-y"), 'make modules' does not build extra-y.
>
> For example, the following command fails:
>
> $ make ARCH=powerpc LLVM=1 KBUILD_MODPOST_WARN=1 mrproper ps3_defconfig modules
> [snip]
> LD [M] arch/powerpc/platforms/cell/spufs/spufs.ko
> ld.lld: error: cannot open arch/powerpc/lib/crtsavres.o: No such file or directory
> make[3]: *** [scripts/Makefile.modfinal:56: arch/powerpc/platforms/cell/spufs/spufs.ko] Error 1
> make[2]: *** [Makefile:1844: modules] Error 2
> make[1]: *** [/home/masahiro/workspace/linux-kbuild/Makefile:350: __build_one_by_one] Error 2
> make: *** [Makefile:234: __sub-make] Error 2
>

Thanks. Is this the correct Fixes tag?

Fixes: d0e628cd817f ("powerpc/64: Do not link crtsavres.o in vmlinux")

Hmm, looks like LLD might just do this now automatically for us
too without --save-restore-funcs (https://reviews.llvm.org/D79977).
But we probably still need it for older versions, so we still need
your patch.

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>

> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
> ---
>
> arch/powerpc/lib/Makefile | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/lib/Makefile b/arch/powerpc/lib/Makefile
> index 51ad0397c17a..6eac63e79a89 100644
> --- a/arch/powerpc/lib/Makefile
> +++ b/arch/powerpc/lib/Makefile
> @@ -45,7 +45,7 @@ obj-$(CONFIG_FUNCTION_ERROR_INJECTION) += error-inject.o
> # so it is only needed for modules, and only for older linkers which
> # do not support --save-restore-funcs
> ifndef CONFIG_LD_IS_BFD
> -extra-$(CONFIG_PPC64) += crtsavres.o
> +always-$(CONFIG_PPC64) += crtsavres.o
> endif
>
> obj-$(CONFIG_PPC_BOOK3S_64) += copyuser_power7.o copypage_power7.o \