Re: [PATCH V15 7/7] powerpc: Enable Rust for ppc64le

[Mukesh Kumar Chaurasiya]

On Sun, Apr 26, 2026 at 04:29:32PM +0530, Mukesh Kumar Chaurasiya (IBM) wrote:
> Enabling rust support for ppc64le.
> 
> Tested on pseries Power11:
> ╰─❯ dmesg | grep rust
> [    0.225728] Initialise system trusted keyrings
> [    0.270961] rust_minimal: Rust minimal sample (init)
> [    0.270968] rust_minimal: Am I built-in? true
> [    0.270974] rust_minimal: test_parameter: 1
> [    0.270983] rust_misc_device: Initialising Rust Misc Device Sample
> [    0.271012] rust_print: Rust printing macros sample (init)
> [    0.271019] rust_print: Emergency message (level 0) without args
> [    0.271023] rust_print: Alert message (level 1) without args
> [    0.271026] rust_print: Critical message (level 2) without args
> [    0.271030] rust_print: Error message (level 3) without args
> [    0.271033] rust_print: Warning message (level 4) without args
> [    0.271037] rust_print: Notice message (level 5) without args
> [    0.271040] rust_print: Info message (level 6) without args
> [    0.271043] rust_print: A line that is continued without args
> [    0.271054] rust_print: Emergency message (level 0) with args
> [    0.271064] rust_print: Alert message (level 1) with args
> [    0.271072] rust_print: Critical message (level 2) with args
> [    0.271077] rust_print: Error message (level 3) with args
> [    0.271083] rust_print: Warning message (level 4) with args
> [    0.271091] rust_print: Notice message (level 5) with args
> [    0.271097] rust_print: Info message (level 6) with args
> [    0.271102] rust_print: A line that is continued with args
> [    0.271110] rust_print: 1
> [    0.271113] rust_print: "hello, world"
> [    0.271121] rust_print: [samples/rust/rust_print_main.rs:35:5] c = "hello, world"
> [    0.271129] rust_print: Arc<dyn Display> says 42
> [    0.271130] rust_print: Arc<dyn Display> says hello, world
> [    0.271136] rust_print: "hello, world"
> [    0.271198] usbcore: registered new interface driver rust_driver_usb
> [    0.271207] rust_faux_driver: Initialising Rust Faux Device Sample
> [    0.271227] faux_driver rust-faux-sample-device: Hello from faux device!
> [    0.271297] rust_configfs: Rust configfs sample (init)
> 
> Reviewed-by: Link Mauve <linkmauve@xxxxxxxxxxxx>
> Tested-by: Link Mauve <linkmauve@xxxxxxxxxxxx>
> Reviewed-by: Christophe Leroy (CS GROUP) <chleroy@xxxxxxxxxx>
> Tested-by: Venkat Rao Bagalkote <venkat88@xxxxxxxxxxxxx>
> Link: https://github.com/Rust-for-Linux/linux/issues/105
> Link: https://github.com/linuxppc/issues/issues/451
> Acked-by: Gary Guo <gary@xxxxxxxxxxx>
> Signed-off-by: Mukesh Kumar Chaurasiya (IBM) <mkchauras@xxxxxxxxx>
> ---
Upstream issue for powerpc64 and powerpc64le target.
Link: https://github.com/rust-lang/compiler-team/issues/987
Link: https://github.com/rust-lang/compiler-team/issues/988

Regards,
Mukesh
>  arch/powerpc/Kconfig  | 1 +
>  arch/powerpc/Makefile | 7 ++++++-
>  rust/Makefile         | 6 ++++++
>  3 files changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index 4ac897b650d4..2e3065bce9cd 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -286,6 +286,7 @@ 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 589613eaa5dc..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 54096ce8a675..068b6fc3e0aa 100644
> --- a/rust/Makefile
> +++ b/rust/Makefile
> @@ -408,7 +408,13 @@ 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
>