Subject: Re: [PATCH V10 0/4] Rust support for powerpc [RESEND]

From: Link Mauve <[email-masked]>
Date: Wed, 8 Apr 2026 15:19:57 +0200

On Wed, Apr 08, 2026 at 05:23:39PM +0530, Mukesh Kumar Chaurasiya wrote:
> On Wed, Apr 08, 2026 at 11:51:40AM +0200, Link Mauve wrote:
> > Hi,
> > 
> > (This email is a resent, my IP address got flagged by spamhaus again
> > because I’m on a residential range, hopefully this incident is
> > resolved…)
> > 
> > On Tue, Apr 07, 2026 at 01:31:45AM +0530, Mukesh Kumar Chaurasiya (IBM) wrote:
> > > Enable experimental rust support for ppc64le and ppc32be. The patch for
> > > ppc32 has been provided by Link Mauve[1] and ppc64le support[2] has been
> > > merged over it. ppc32 needs some toolchain fixes mentioned in the patch
> > > `rust: Add PowerPC support` and the discussion for that is done here[1].
> > > 
> > > This has been tested on
> > > - powernv9 hardware
> > > - pseries P11 hardware
> > > - pseries(9, 10) qemu
> > > - powernv(9, 10) qemu
> > > - rustdoc on x86 and powerpc64le
> > > - rusttest on x86 and powerpc64le
> > 
> > I just tested your series for the Wii, so targeting powerpc (32, be),
> > and got this error:
> > ```
> > error[E0463]: can't find crate for `pin_init_internal`
> >    --> ../rust/pin-init/src/lib.rs:365:11
> >     |
> > 365 | pub use ::pin_init_internal::pin_data;
> >     |           ^^^^^^^^^^^^^^^^^ can't find crate
> > 
> > error: aborting due to 1 previous error
> > 
> > For more information about this error, try `rustc --explain E0463`.
> > ```
> > 
> > I didn’t get this error in a previous version of your series, would you
> > want me to bisect them?
> > 
> > Thanks for your continuous work on it anyway!
> > 
> 
> Hey Link,
> 
> Thanks for testing this.
> 
> Can you give me the command generated via make with V=1
> e.g. `make LLVM=1 V=1`

Here it is:
```
% make ARCH=powerpc CROSS_COMPILE=powerpc-linux-musl- O=wii W=1 V=1 -j1
make  -C /home/linkmauve/dev/linux/wii \
-f /home/linkmauve/dev/linux/Makefile
make[1]: Entering directory '/home/linkmauve/dev/linux/wii'
make --no-print-directory -C /home/linkmauve/dev/linux/wii \
-f /home/linkmauve/dev/linux/Makefile
ln -fsn .. source
# GEN     Makefile
  { echo "# Automatically generated by /home/linkmauve/dev/linux/Makefile: don't edit"; echo "export KBUILD_OUTPUT = /home/linkmauve/dev/linux/wii"; echo "include /home/linkmauve/dev/linux/Makefile"; } > Makefile
test -e .gitignore || \
{ echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
make -f ../scripts/Makefile.build obj=arch/powerpc/kernel/syscalls all
make -f ../scripts/Makefile.build obj=scripts/basic
make -f ../scripts/Makefile.build obj=scripts/dtc
make -f ../scripts/Makefile.build obj=scripts
make -f ../scripts/Makefile.build obj=scripts/gcc-plugins \
need-builtin= \
need-modorder= \

set -e; mkdir -p include/config/; trap "rm -f include/config/.tmp_kernel.release" EXIT; { ../scripts/setlocalversion ..; } > include/config/.tmp_kernel.release; if [ ! -r include/config/kernel.release ] || ! cmp -s include/config/kernel.release include/config/.tmp_kernel.release; then : '  UPD     include/config/kernel.release'; mv -f include/config/.tmp_kernel.release include/config/kernel.release; fi
make -f ../scripts/Makefile.asm-headers obj=arch/powerpc/include/generated/uapi/asm \
generic=include/uapi/asm-generic
make -f ../scripts/Makefile.asm-headers obj=arch/powerpc/include/generated/asm \
generic=include/asm-generic
set -e; mkdir -p include/generated/uapi/linux/; trap "rm -f include/generated/uapi/linux/.tmp_version.h" EXIT; { 	if [ 0 -gt 255 ]; then echo \#define LINUX_VERSION_CODE 459007; else echo \#define LINUX_VERSION_CODE 458752; fi; echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + ((c) > 255 ? 255 : (c)))'; echo \#define LINUX_VERSION_MAJOR 7; echo \#define LINUX_VERSION_PATCHLEVEL 0; echo \#define LINUX_VERSION_SUBLEVEL 0; } > include/generated/uapi/linux/.tmp_version.h; if [ ! -r include/generated/uapi/linux/version.h ] || ! cmp -s include/generated/uapi/linux/version.h include/generated/uapi/linux/.tmp_version.h; then : '  UPD     include/generated/uapi/linux/version.h'; mv -f include/generated/uapi/linux/.tmp_version.h include/generated/uapi/linux/version.h; fi
set -e; mkdir -p include/generated/; trap "rm -f include/generated/.tmp_utsrelease.h" EXIT; { 	if [ `echo -n "7.0.0-rc7-wii+" | wc -c ` -gt 64 ]; then echo '"7.0.0-rc7-wii+" exceeds 64 characters' >&2; exit 1; fi; echo \#define UTS_RELEASE \"7.0.0-rc7-wii+\"; } > include/generated/.tmp_utsrelease.h; if [ ! -r include/generated/utsrelease.h ] || ! cmp -s include/generated/utsrelease.h include/generated/.tmp_utsrelease.h; then : '  UPD     include/generated/utsrelease.h'; mv -f include/generated/.tmp_utsrelease.h include/generated/utsrelease.h; fi
set -e; mkdir -p include/generated/; trap "rm -f include/generated/.tmp_compile.h" EXIT; { ../scripts/mkcompile_h "ppc" "powerpc-linux-musl-gcc (GCC) 14.2.1 20250405" "powerpc-linux-musl-ld"; } > include/generated/.tmp_compile.h; if [ ! -r include/generated/compile.h ] || ! cmp -s include/generated/compile.h include/generated/.tmp_compile.h; then : '  UPD     include/generated/compile.h'; mv -f include/generated/.tmp_compile.h include/generated/compile.h; fi
../scripts/remove-stale-files
make -f ../scripts/Makefile.build obj=scripts/mod
set -e; mkdir -p scripts/mod/; trap "rm -f scripts/mod/.tmp_devicetable-offsets.h" EXIT; { 	 echo "#ifndef __DEVICETABLE_OFFSETS_H__"; echo "#define __DEVICETABLE_OFFSETS_H__"; echo "/*"; echo " * DO NOT MODIFY."; echo " *"; echo " * This file was generated by Kbuild"; echo " */"; echo ""; sed -ne 	's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; /^->/{s:->#\(.*\):/* \1 */:; s:^->\([^ ]*\) [\$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}' < scripts/mod/devicetable-offsets.s; echo ""; echo "#endif"; } > scripts/mod/.tmp_devicetable-offsets.h; if [ ! -r scripts/mod/devicetable-offsets.h ] || ! cmp -s scripts/mod/devicetable-offsets.h scripts/mod/.tmp_devicetable-offsets.h; then : '  UPD     scripts/mod/devicetable-offsets.h'; mv -f scripts/mod/.tmp_devicetable-offsets.h scripts/mod/devicetable-offsets.h; fi
make -f ../scripts/Makefile.build obj=. prepare
set -e; mkdir -p include/generated/; trap "rm -f include/generated/.tmp_timeconst.h" EXIT; { echo 1000 | bc -q ../kernel/time/timeconst.bc; } > include/generated/.tmp_timeconst.h; if [ ! -r include/generated/timeconst.h ] || ! cmp -s include/generated/timeconst.h include/generated/.tmp_timeconst.h; then : '  UPD     include/generated/timeconst.h'; mv -f include/generated/.tmp_timeconst.h include/generated/timeconst.h; fi
set -e; mkdir -p include/generated/; trap "rm -f include/generated/.tmp_bounds.h" EXIT; { 	 echo "#ifndef __LINUX_BOUNDS_H__"; echo "#define __LINUX_BOUNDS_H__"; echo "/*"; echo " * DO NOT MODIFY."; echo " *"; echo " * This file was generated by Kbuild"; echo " */"; echo ""; sed -ne 	's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; /^->/{s:->#\(.*\):/* \1 */:; s:^->\([^ ]*\) [\$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}' < kernel/bounds.s; echo ""; echo "#endif"; } > include/generated/.tmp_bounds.h; if [ ! -r include/generated/bounds.h ] || ! cmp -s include/generated/bounds.h include/generated/.tmp_bounds.h; then : '  UPD     include/generated/bounds.h'; mv -f include/generated/.tmp_bounds.h include/generated/bounds.h; fi
set -e; mkdir -p include/generated/; trap "rm -f include/generated/.tmp_asm-offsets.h" EXIT; { 	 echo "#ifndef __ASM_OFFSETS_H__"; echo "#define __ASM_OFFSETS_H__"; echo "/*"; echo " * DO NOT MODIFY."; echo " *"; echo " * This file was generated by Kbuild"; echo " */"; echo ""; sed -ne 	's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; /^->/{s:->#\(.*\):/* \1 */:; s:^->\([^ ]*\) [\$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}' < arch/powerpc/kernel/asm-offsets.s; echo ""; echo "#endif"; } > include/generated/.tmp_asm-offsets.h; if [ ! -r include/generated/asm-offsets.h ] || ! cmp -s include/generated/asm-offsets.h include/generated/.tmp_asm-offsets.h; then : '  UPD     include/generated/asm-offsets.h'; mv -f include/generated/.tmp_asm-offsets.h include/generated/asm-offsets.h; fi
set -e; mkdir -p include/generated/; trap "rm -f include/generated/.tmp_rq-offsets.h" EXIT; { 	 echo "#ifndef __RQ_OFFSETS_H__"; echo "#define __RQ_OFFSETS_H__"; echo "/*"; echo " * DO NOT MODIFY."; echo " *"; echo " * This file was generated by Kbuild"; echo " */"; echo ""; sed -ne 	's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; /^->/{s:->#\(.*\):/* \1 */:; s:^->\([^ ]*\) [\$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}' < kernel/sched/rq-offsets.s; echo ""; echo "#endif"; } > include/generated/.tmp_rq-offsets.h; if [ ! -r include/generated/rq-offsets.h ] || ! cmp -s include/generated/rq-offsets.h include/generated/.tmp_rq-offsets.h; then : '  UPD     include/generated/rq-offsets.h'; mv -f include/generated/.tmp_rq-offsets.h include/generated/rq-offsets.h; fi
# CALL    ../scripts/checksyscalls.sh
  sh ../scripts/checksyscalls.sh powerpc-linux-musl-gcc -Wp,-MMD,./.missing-syscalls.d -nostdinc -I../arch/powerpc/include -I./arch/powerpc/include/generated -I../include -I./include -I../arch/powerpc/include/uapi -I./arch/powerpc/include/generated/uapi -I../include/uapi -I./include/generated/uapi -include ../include/linux/compiler-version.h -include ../include/linux/kconfig.h -include ../include/linux/compiler_types.h -D__KERNEL__ -mbig-endian -m32 -I ../arch/powerpc -fmacro-prefix-map=../= -Wundef -DKBUILD_EXTRA_WARN1 -std=gnu11 -fshort-wchar -funsigned-char -fno-common -fno-PIE -fno-strict-aliasing -msoft-float -ffixed-r2 -mmultiple -mno-readonly-in-sdata -mcpu=powerpc -mno-prefixed -mno-pcrel -mno-altivec -mno-vsx -mno-mma -fno-asynchronous-unwind-tables -mno-string -mbig-endian -fno-delete-null-pointer-checks -Os -fno-allow-store-data-races -fno-stack-protector -fomit-frame-pointer -ftrivial-auto-var-init=zero -fno-stack-clash-protection -fmin-function-alignment=4 -fstrict-flex-arrays=3 -fms-extensions -fno-strict-overflow -fno-stack-check -fconserve-stack -fno-builtin-wcslen -Wall -Wextra -Wundef -Werror=implicit-function-declaration -Werror=implicit-int -Werror=return-type -Werror=strict-prototypes -Wno-format-security -Wno-trigraphs -Wno-frame-address -Wno-address-of-packed-member -Wmissing-declarations -Wmissing-prototypes -Wframe-larger-than=1280 -Wno-main -Wno-type-limits -Wno-dangling-pointer -Wvla-larger-than=1 -Wno-pointer-sign -Wcast-function-type -Wno-array-bounds -Wno-stringop-overflow -Wno-alloc-size-larger-than -Wimplicit-fallthrough=5 -Werror=date-time -Werror=incompatible-pointer-types -Werror=designated-init -Wenum-conversion -Wunused -Wmissing-format-attribute -Wmissing-include-dirs -Wunused-const-variable -Wno-missing-field-initializers -Wno-shift-negative-value -Wno-maybe-uninitialized -Wno-sign-compare -Wno-unused-parameter -DGCC_PLUGINS -I../. -I.    -DKBUILD_MODFILE='"./missing-syscalls"' -DKBUILD_BASENAME='"missing_syscalls"' -DKBUILD_MODNAME='"missing_syscalls"' -D__KBUILD_MODNAME=missing_syscalls
make -f ../scripts/Makefile.build obj=arch/powerpc/kernel/vdso include/generated/vdso32-offsets.h
mkdir -p ./tools
make O=/home/linkmauve/dev/linux/wii subdir=tools -C ../tools/ objtool
mkdir -p /home/linkmauve/dev/linux/wii/tools/objtool && make O=/home/linkmauve/dev/linux/wii subdir=tools/objtool --no-print-directory -C objtool
make -C /home/linkmauve/dev/linux/tools/build CFLAGS= LDFLAGS= /home/linkmauve/dev/linux/wii/tools/objtool/fixdep
if [ ! -f /home/linkmauve/dev/linux/wii/tools/objtool/fixdep ]; then						\
	make -f /home/linkmauve/dev/linux/tools/build/Makefile.build dir=. obj=fixdep HOSTCFLAGS="-Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu11   -I ../scripts/include";	\
	rm -f /home/linkmauve/dev/linux/wii/tools/objtool/fixdep.o;						\
fi
make -f /home/linkmauve/dev/linux/tools/build/Makefile.build dir=. obj=fixdep HOSTCFLAGS="-Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu11   -I ../scripts/include"
make -C /home/linkmauve/dev/linux/tools/lib/subcmd/ O=/home/linkmauve/dev/linux/wii/tools/objtool/libsubcmd \
	DESTDIR=/home/linkmauve/dev/linux/wii/tools/objtool/libsubcmd prefix= subdir= \
	CC="gcc" LD="ld" AR="ar" EXTRA_CFLAGS="-std=gnu11 -fomit-frame-pointer -O2 -g -Werror -Wall -Wextra -Wmissing-prototypes -Wmissing-declarations -Wwrite-strings -Wno-implicit-fallthrough -Wno-sign-compare -Wno-unused-parameter -I/home/linkmauve/dev/linux/tools/include -I/home/linkmauve/dev/linux/tools/include/uapi -I/home/linkmauve/dev/linux/tools/arch/x86/include/uapi -I/home/linkmauve/dev/linux/tools/arch/powerpc/include -I/home/linkmauve/dev/linux/tools/objtool/include -I/home/linkmauve/dev/linux/tools/objtool/arch/powerpc/include -I/home/linkmauve/dev/linux/wii/tools/objtool/libsubcmd/include   " \
	/home/linkmauve/dev/linux/wii/tools/objtool/libsubcmd/libsubcmd.a install_headers
make -C /home/linkmauve/dev/linux/tools/build CFLAGS= LDFLAGS= /home/linkmauve/dev/linux/wii/tools/objtool/libsubcmd/fixdep
if [ ! -f /home/linkmauve/dev/linux/wii/tools/objtool/libsubcmd/fixdep ]; then						\
	make -f /home/linkmauve/dev/linux/tools/build/Makefile.build dir=. obj=fixdep HOSTCFLAGS="-Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu11   -I ../scripts/include";	\
	rm -f /home/linkmauve/dev/linux/wii/tools/objtool/libsubcmd/fixdep.o;						\
fi
make -f /home/linkmauve/dev/linux/tools/build/Makefile.build dir=. obj=fixdep HOSTCFLAGS="-Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu11   -I ../scripts/include"
make[5]: 'install_headers' is up to date.
sh ./sync-check.sh
make -f /home/linkmauve/dev/linux/tools/build/Makefile.build dir=. obj=objtool CC="gcc" LD="ld" AR="ar" CFLAGS="-std=gnu11 -fomit-frame-pointer -O2 -g -Werror -Wall -Wextra -Wmissing-prototypes -Wmissing-declarations -Wwrite-strings -Wno-implicit-fallthrough -Wno-sign-compare -Wno-unused-parameter -I/home/linkmauve/dev/linux/tools/include -I/home/linkmauve/dev/linux/tools/include/uapi -I/home/linkmauve/dev/linux/tools/arch/x86/include/uapi -I/home/linkmauve/dev/linux/tools/arch/powerpc/include -I/home/linkmauve/dev/linux/tools/objtool/include -I/home/linkmauve/dev/linux/tools/objtool/arch/powerpc/include -I/home/linkmauve/dev/linux/wii/tools/objtool/libsubcmd/include   " \
	LDFLAGS="/home/linkmauve/dev/linux/wii/tools/objtool/libsubcmd/libsubcmd.a -lelf  "
make -f /home/linkmauve/dev/linux/tools/build/Makefile.build dir=./arch/powerpc obj=objtool
sh ../scripts/rust_is_available.sh
make -f ../scripts/Makefile.build obj=rust
# RUSTC L rust/pin_init.o
  OBJTREE=/home/linkmauve/dev/linux/wii rustc --edition=2021 -Zbinary_dep_depinfo=y -Astable_features -Aunused_features -Dnon_ascii_idents -Dunsafe_op_in_unsafe_fn -Wmissing_docs -Wrust_2018_idioms -Wunreachable_pub -Wclippy::all -Wclippy::as_ptr_cast_mut -Wclippy::as_underscore -Wclippy::cast_lossless -Wclippy::ignored_unit_patterns -Wclippy::mut_mut -Wclippy::needless_bitwise_bool -Aclippy::needless_lifetimes -Wclippy::no_mangle_with_rust_abi -Wclippy::ptr_as_ptr -Wclippy::ptr_cast_constness -Wclippy::ref_as_ptr -Wclippy::undocumented_unsafe_blocks -Wclippy::unnecessary_safety_comment -Wclippy::unnecessary_safety_doc -Wrustdoc::missing_crate_level_docs -Wrustdoc::unescaped_backticks -Cpanic=abort -Cembed-bitcode=n -Clto=n -Cforce-unwind-tables=n -Ccodegen-units=1 -Csymbol-mangling-version=v0 -Crelocation-model=static -Zfunction-sections=n -Wclippy::float_arithmetic --target=powerpc-unknown-linux-gnu -Copt-level=s -Cdebug-assertions=n -Coverflow-checks=y @./include/generated/rustc_cfg --extern pin_init_internal --extern macros --cfg='kernel' --emit=dep-info=rust/.pin_init.o.d --emit=obj=rust/pin_init.o --emit=metadata=rust/libpin_init.rmeta --crate-type rlib -L./rust --crate-name pin_init ../rust/pin-init/src/lib.rs --sysroot=/dev/null -Zunstable-options   ; ./tools/objtool/objtool --static-call   rust/pin_init.o
error[E0463]: can't find crate for `pin_init_internal`
   --> ../rust/pin-init/src/lib.rs:365:11
    |
365 | pub use ::pin_init_internal::pin_data;
    |           ^^^^^^^^^^^^^^^^^ can't find crate

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0463`.
make[3]: *** [../rust/Makefile:681: rust/pin_init.o] Error 1
make[2]: *** [/home/linkmauve/dev/linux/Makefile:1343: prepare] Error 2
make[1]: *** [/home/linkmauve/dev/linux/Makefile:248: __sub-make] Error 2
make[1]: Leaving directory '/home/linkmauve/dev/linux/wii'
make: *** [Makefile:248: __sub-make] Error 2
make ARCH=powerpc CROSS_COMPILE=powerpc-linux-musl- O=wii W=1 V=1 -j1  1.15s user 0.56s system 100% cpu 1.695 total
```

> 
> Regards,
> Mukesh
> 
> > > 
> > > We are actively working with our LLVM team to get the target for ppc,
> > > ppc64 and ppc64le in the rust compiler.
> > > 
> > > 
> > > [1] https://lore.kernel.org/all/[email-masked]
> > > [2] https://lore.kernel.org/all/[email-masked]
> > > 
> > > Changelog:
> > > V9 -> V10:
> > > - rust/Makefile updated with review comments from Miguel
> > > - Patch 1/4 updated with commit message and subject
> > > V9: https://lore.kernel.org/all/[email-masked]/
> > > 
> > > V8 -> V9:
> > > - rust/Makefile updated with a directory instead of abspath
> > > V8: https://lore.kernel.org/all/[email-masked]/
> > > 
> > > V7 -> V8:
> > > - rust/Makefile updated to separate host libraries from target
> > > V7: https://lore.kernel.org/all/[email-masked]/
> > > 
> > > Changelog:
> > > V6 -> V7:
> > > - Documentation removed as powerpc is still under development
> > > - Added a fix for race condition in rust/Makefile
> > > V6: https://lore.kernel.org/all/[email-masked]
> > > 
> > > V5 -> V6:
> > > - Added a missing Tested by from Venkat which got missed since V3
> > > - Support is marked as Maintained instead of experimental
> > > V5: https://lore.kernel.org/all/[email-masked]
> > > 
> > > V4 -> V5:
> > > - Removed a nested ifdef from PPC64 for Little endian toolchain
> > > V4: https://lore.kernel.org/all/[email-masked]
> > > 
> > > V3 -> V4:
> > > - Co-developed-by header added in patch 1
> > > V3: https://lore.kernel.org/all/[email-masked]
> > > 
> > > V2 -> V3:
> > > - Splited HAVE_RUST in 2 lines
> > > - BINDGEN_TARGET_powerpc initialized before assigning the same to
> > >   BINDGEN_TARGET
> > > V2: https://lore.kernel.org/all/[email-masked]
> > > 
> > > V1 -> V2:
> > > - jump label fix for rust has been moved to a separate patch
> > > - PPC32 support has been taken
> > > - rust support has been marked experimental
> > > - target.json dependency has been removed
> > > - HAVE_RUST now depends on CPU_LITTLE_ENDIAN for PPC64
> > > 
> > > Link Mauve (1):
> > >   rust: Add PowerPC support
> > > 
> > > Mukesh Kumar Chaurasiya (IBM) (3):
> > >   rust: Fix "multiple candidates for rmeta dependency core" error
> > >   powerpc/jump_label: adjust inline asm to be consistent
> > >   powerpc: Enable Rust for ppc64le
> > > 
> > >  arch/powerpc/Kconfig                  |  2 +
> > >  arch/powerpc/Makefile                 |  7 +++
> > >  arch/powerpc/include/asm/jump_label.h | 23 ++++++----
> > >  rust/Makefile                         | 66 ++++++++++++++++-----------
> > >  4 files changed, 61 insertions(+), 37 deletions(-)
> > > 
> > > -- 
> > > 2.53.0
> > > 
> > > 
> > 
> > -- 
> > Link Mauve
> > 

-- 
Link Mauve