[PATCH V6 3/3] powerpc: Enable Rust for ppc64le

Mukesh Kumar Chaurasiya (IBM)
2026-02-10T10:57:29Z

Enabling rust support for ppc64le only.

Tested on powernv9:

$ uname -rm
6.19.0-rc8+ ppc64le

$ sudo modprobe rust_minimal
[ 632.890850] rust_minimal: Rust minimal sample (init)
[ 632.890881] rust_minimal: Am I built-in? false
[ 632.890898] rust_minimal: test_parameter: 1

$ sudo rmmod rust_minimal
[ 648.272832] rust_minimal: My numbers are [72, 108, 200]
[ 648.272873] rust_minimal: Rust minimal sample (exit)

$ sudo modprobe rust_print
[ 843.410391] rust_print: Rust printing macros sample (init)
[ 843.410424] rust_print: Emergency message (level 0) without args
[ 843.410451] rust_print: Alert message (level 1) without args
[ 843.410477] rust_print: Critical message (level 2) without args
[ 843.410503] rust_print: Error message (level 3) without args
[ 843.410530] rust_print: Warning message (level 4) without args
[ 843.410557] rust_print: Notice message (level 5) without args
[ 843.410594] rust_print: Info message (level 6) without args
[ 843.410617] rust_print: A line that is continued without args
[ 843.410646] rust_print: Emergency message (level 0) with args
[ 843.410675] rust_print: Alert message (level 1) with args
[ 843.410691] rust_print: Critical message (level 2) with args
[ 843.410727] rust_print: Error message (level 3) with args
[ 843.410761] rust_print: Warning message (level 4) with args
[ 843.410796] rust_print: Notice message (level 5) with args
[ 843.410821] rust_print: Info message (level 6) with args
[ 843.410854] rust_print: A line that is continued with args
[ 843.410892] rust_print: 1
[ 843.410895] rust_print: "hello, world"
[ 843.410924] rust_print: [samples/rust/rust_print_main.rs:35:5] c = "hello, world"
[ 843.410977] rust_print: Arc<dyn Display> says 42
[ 843.410979] rust_print: Arc<dyn Display> says hello, world

$ sudo rmmod rust_print
[ 843.411003] rust_print: "hello, world"
[ 888.499935] rust_print: Rust printing macros sample (exit)

Reviewed-by: Link Mauve <linkmauve@linkmauve.fr>
Tested-by: Link Mauve <linkmauve@linkmauve.fr>
Reviewed-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Signed-off-by: Mukesh Kumar Chaurasiya (IBM) <mkchauras@gmail.com>
---
Documentation/rust/arch-support.rst | 2 +-
arch/powerpc/Kconfig | 1 +
arch/powerpc/Makefile | 7 ++++++-
rust/Makefile | 6 ++++++
4 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/Documentation/rust/arch-support.rst b/Documentation/rust/arch-support.rst
index 70b9e192a7a0..70bcd726ad0e 100644
--- a/Documentation/rust/arch-support.rst
+++ b/Documentation/rust/arch-support.rst
@@ -18,7 +18,7 @@ Architecture Level of support Constraints
``arm`` Maintained ARMv7 Little Endian only.
``arm64`` Maintained Little Endian only.
``loongarch`` Maintained \-
-``powerpc`` Maintained 32-bit Big Endian only.
+``powerpc`` Maintained 64-bit Little Endian. 32-bit Big Endian.
``riscv`` Maintained ``riscv64`` and LLVM/Clang only.
``um`` Maintained \-
``x86`` Maintained ``x86_64`` only.
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 17db23b82e91..954af27e10c5 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -284,6 +284,7 @@ config PPC
select HAVE_RELIABLE_STACKTRACE
select HAVE_RSEQ
select HAVE_RUST if PPC32
+ select HAVE_RUST if PPC64 && CPU_LITTLE_ENDIAN
select HAVE_SAMPLE_FTRACE_DIRECT if HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
select HAVE_SAMPLE_FTRACE_DIRECT_MULTI if HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
select HAVE_SETUP_PER_CPU_AREA if PPC64
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 9fd82c75dcbd..9385db478c59 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -61,7 +61,12 @@ else
KBUILD_LDFLAGS_MODULE += $(objtree)/arch/powerpc/lib/crtsavres.o
endif

-KBUILD_RUSTFLAGS += --target=powerpc-unknown-linux-gnu
+ifdef CONFIG_PPC64
+KBUILD_RUSTFLAGS += --target=powerpc64le-unknown-linux-gnu
+KBUILD_RUSTFLAGS += -Ctarget-feature=-mma,-vsx,-hard-float,-altivec
+else
+KBUILD_RUSTFLAGS += --target=powerpc-unknown-linux-gnu
+endif

ifdef CONFIG_CPU_LITTLE_ENDIAN
KBUILD_CPPFLAGS += -mlittle-endian
diff --git a/rust/Makefile b/rust/Makefile
index ae22f2c5f0b3..0aef472c6cf5 100644
--- a/rust/Makefile
+++ b/rust/Makefile
@@ -392,7 +392,13 @@ BINDGEN_TARGET_x86 := x86_64-linux-gnu
BINDGEN_TARGET_arm64 := aarch64-linux-gnu
BINDGEN_TARGET_arm := arm-linux-gnueabi
BINDGEN_TARGET_loongarch := loongarch64-linux-gnusf
+
+ifdef CONFIG_PPC64
+BINDGEN_TARGET_powerpc := powerpc64le-linux-gnu
+else
BINDGEN_TARGET_powerpc := powerpc-linux-gnu
+endif
+
BINDGEN_TARGET_um := $(BINDGEN_TARGET_$(SUBARCH))
BINDGEN_TARGET := $(BINDGEN_TARGET_$(SRCARCH))

--
2.53.0