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
Signed-off-by: Masahiro Yamada <[email protected]>
---
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 \
--
2.40.1
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 <[email protected]>
> Signed-off-by: Masahiro Yamada <[email protected]>
> ---
>
> 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 \
On Tue, Nov 21, 2023 at 6:55 PM Aneesh Kumar K.V
<[email protected]> wrote:
>
> "Nicholas Piggin" <[email protected]> writes:
>
> > 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")
> >
>
> I am finding a different commit ID:
>
> commit baa25b571a168aff5a13bfdc973f1229e2b12b63
> Author: Nicholas Piggin <[email protected]>
> Date: Fri May 12 01:56:49 2017 +1000
>
> powerpc/64: Do not link crtsavres.o in vmlinux
>
> The 64-bit linker creates save/restore functions on demand with final
> links, so vmlinux does not require crtsavres.o.
>
>
> -aneesh
Yeah, I think the correct tag is:
Fixes: baa25b571a16 ("powerpc/64: Do not link crtsavres.o in vmlinux")
--
Best Regards
Masahiro Yamada
Masahiro Yamada <[email protected]> writes:
> On Tue, Nov 21, 2023 at 6:55 PM Aneesh Kumar K.V
> <[email protected]> wrote:
>>
>> "Nicholas Piggin" <[email protected]> writes:
>>
>> > 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")
>> >
>>
>> I am finding a different commit ID:
>>
>> commit baa25b571a168aff5a13bfdc973f1229e2b12b63
>> Author: Nicholas Piggin <[email protected]>
>> Date: Fri May 12 01:56:49 2017 +1000
>>
>> powerpc/64: Do not link crtsavres.o in vmlinux
>>
>> The 64-bit linker creates save/restore functions on demand with final
>> links, so vmlinux does not require crtsavres.o.
>
> Yeah, I think the correct tag is:
>
> Fixes: baa25b571a16 ("powerpc/64: Do not link crtsavres.o in vmlinux")
Yep, I used that when applying.
cheers
On Tue, 21 Nov 2023 08:23:32 +0900, 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
>
> [...]
Applied to powerpc/next.
[1/1] powerpc: add crtsavres.o to always-y instead of extra-y
https://git.kernel.org/powerpc/c/1b1e38002648819c04773647d5242990e2824264
cheers
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
Jan Stancek <[email protected]> writes:
> 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?
Or modules_prepare?
Example patch below.
cheers
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 051247027da0..82cdef40a9cd 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -59,6 +59,11 @@ ifeq ($(CONFIG_PPC64)$(CONFIG_LD_IS_BFD),yy)
KBUILD_LDFLAGS_MODULE += --save-restore-funcs
else
KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
+
+crtsavres_prepare: scripts
+ $(MAKE) $(build)=arch/powerpc/lib arch/powerpc/lib/crtsavres.o
+
+modules_prepare: crtsavres_prepare
endif
ifdef CONFIG_CPU_LITTLE_ENDIAN
On Mon, Feb 5, 2024 at 12:50 PM Michael Ellerman <[email protected]> wrote:
>
> Jan Stancek <[email protected]> writes:
> > 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?
>
> Or modules_prepare?
>
> Example patch below.
I tested your patch with my setup and that works for me as well.
>
> cheers
>
>
> diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
> index 051247027da0..82cdef40a9cd 100644
> --- a/arch/powerpc/Makefile
> +++ b/arch/powerpc/Makefile
> @@ -59,6 +59,11 @@ ifeq ($(CONFIG_PPC64)$(CONFIG_LD_IS_BFD),yy)
> KBUILD_LDFLAGS_MODULE += --save-restore-funcs
> else
> KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
> +
> +crtsavres_prepare: scripts
> + $(MAKE) $(build)=arch/powerpc/lib arch/powerpc/lib/crtsavres.o
> +
> +modules_prepare: crtsavres_prepare
> endif
>
> ifdef CONFIG_CPU_LITTLE_ENDIAN
>
On Mon, Feb 5, 2024 at 10:22 PM Jan Stancek <[email protected]> wrote:
>
> On Mon, Feb 5, 2024 at 12:50 PM Michael Ellerman <[email protected]> wrote:
> >
> > Jan Stancek <[email protected]> writes:
> > > 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?
> >
> > Or modules_prepare?
> >
> > Example patch below.
>
> I tested your patch with my setup and that works for me as well.
>
Please note 'make ARCH=powerpc clean' will remove '*.o'
files globally.
Kbuild promised you would still be able to compile external modules
after 'make clean' (until you run 'make mrproper'), but
that would not work in this case.
So, the external module support for powerpc
is broken in another way, already.
Perhaps, an easy workaround might be to change
the suffix, but I did not test it at all.
mv arch/powerpc/lib/crtsavres.o arch/powerpc/lib/crtsavres.o.do_not_remove_me
--
Best Regards
Masahiro Yamada