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

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Date: Tue, 30 Jan 2024 10:54:20 +0100
From: Jan Stancek <jstancek@...hat.com>
To: Nicholas Piggin <npiggin@...il.com>
Cc: Masahiro Yamada <masahiroy@...nel.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	linuxppc-dev@...ts.ozlabs.org,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Tom Rix <trix@...hat.com>, linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev, jstancek@...hat.com
Subject: Re: [PATCH] powerpc: add crtsavres.o to always-y instead of extra-y

On Tue, Nov 21, 2023 at 10:51:34AM +1000, Nicholas Piggin wrote:
>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.

Hi,

I'm still seeing the error of crtsavres.o missing when building external modules
after "make LLVM=1 modules_prepare". Should it be built also in archprepare?

Thanks,
Jan


diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 051247027..a62334194 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -57,8 +57,11 @@ ifeq ($(CONFIG_PPC64)$(CONFIG_LD_IS_BFD),yy)
  # Have the linker provide sfpr if possible.
  # There is a corresponding test in arch/powerpc/lib/Makefile
  KBUILD_LDFLAGS_MODULE += --save-restore-funcs
+crtsavres_prepare:
  else
  KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
+crtsavres_prepare:
+       $(MAKE) $(build)=arch/powerpc/lib arch/powerpc/lib/crtsavres.o
  endif

  ifdef CONFIG_CPU_LITTLE_ENDIAN
@@ -389,7 +392,7 @@ vdso_prepare: prepare0
                 $(build)=arch/powerpc/kernel/vdso include/generated/vdso64-offsets.h)
  endif

-archprepare: checkbin
+archprepare: checkbin crtsavres_prepare

  archheaders:
         $(Q)$(MAKE) $(build)=arch/powerpc/kernel/syscalls all