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Wed, 04 Feb 2026 13:02:15 -0800 (PST) From: "Mukesh Kumar Chaurasiya (IBM)" To: linkmauve@linkmauve.fr, ojeda@kernel.org, boqun.feng@gmail.com, gary@garyguo.net, bjorn3_gh@protonmail.com, lossin@kernel.org, a.hindborg@kernel.org, aliceryhl@google.com, tmgross@umich.edu, dakr@kernel.org, corbet@lwn.net, maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com, chleroy@kernel.org, peterz@infradead.org, jpoimboe@kernel.org, jbaron@akamai.com, rostedt@goodmis.org, ardb@kernel.org, rust-for-linux@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Cc: "Mukesh Kumar Chaurasiya (IBM)" Subject: [PATCH V2 1/3] powerpc/jump_label: adjust inline asm to be consistent Date: Thu, 5 Feb 2026 02:31:23 +0530 Message-ID: <20260204210125.613350-2-mkchauras@gmail.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260204210125.613350-1-mkchauras@gmail.com> References: <20260204210125.613350-1-mkchauras@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Added support for a new macro ARCH_STATIC_BRANCH_ASM in powerpc to avoid duplication of inline asm between C and Rust. This is inline with commit aecaf181651c '("jump_label: adjust inline asm to be cons= istent")' Signed-off-by: Madhavan Srinivasan Signed-off-by: Mukesh Kumar Chaurasiya (IBM) Reviewed-by: Alice Ryhl Reviewed-by: Christophe Leroy (CS GROUP) --- arch/powerpc/include/asm/jump_label.h | 23 +++++++++++++---------- 1 file changed, 13 insertions(+), 10 deletions(-) diff --git a/arch/powerpc/include/asm/jump_label.h b/arch/powerpc/include/a= sm/jump_label.h index d4eaba459a0e..a6b211502bfe 100644 --- a/arch/powerpc/include/asm/jump_label.h +++ b/arch/powerpc/include/asm/jump_label.h @@ -15,14 +15,20 @@ #define JUMP_ENTRY_TYPE stringify_in_c(FTR_ENTRY_LONG) #define JUMP_LABEL_NOP_SIZE 4 =20 +#define JUMP_TABLE_ENTRY(key, label) \ + ".pushsection __jump_table, \"aw\" \n\t" \ + ".long 1b - ., " label " - . \n\t" \ + JUMP_ENTRY_TYPE key " - . \n\t" \ + ".popsection \n\t" + +#define ARCH_STATIC_BRANCH_ASM(key, label) \ + "1: nop \n\t" \ + JUMP_TABLE_ENTRY(key,label) + static __always_inline bool arch_static_branch(struct static_key *key, boo= l branch) { - asm goto("1:\n\t" - "nop # arch_static_branch\n\t" - ".pushsection __jump_table, \"aw\"\n\t" - ".long 1b - ., %l[l_yes] - .\n\t" - JUMP_ENTRY_TYPE "%c0 - .\n\t" - ".popsection \n\t" + asm goto( + ARCH_STATIC_BRANCH_ASM("%c0", "%l[l_yes]") : : "i" (&((char *)key)[branch]) : : l_yes); 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Wed, 04 Feb 2026 13:02:24 -0800 (PST) Received: from li-1a3e774c-28e4-11b2-a85c-acc9f2883e29.ibm.com.com ([106.51.164.193]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-8241d1bd466sm3277977b3a.20.2026.02.04.13.02.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Feb 2026 13:02:24 -0800 (PST) From: "Mukesh Kumar Chaurasiya (IBM)" To: linkmauve@linkmauve.fr, ojeda@kernel.org, boqun.feng@gmail.com, gary@garyguo.net, bjorn3_gh@protonmail.com, lossin@kernel.org, a.hindborg@kernel.org, aliceryhl@google.com, tmgross@umich.edu, dakr@kernel.org, corbet@lwn.net, maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com, chleroy@kernel.org, peterz@infradead.org, jpoimboe@kernel.org, jbaron@akamai.com, rostedt@goodmis.org, ardb@kernel.org, rust-for-linux@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Cc: "Mukesh Kumar Chaurasiya (IBM)" Subject: [PATCH V2 2/3] rust: Add PowerPC support Date: Thu, 5 Feb 2026 02:31:24 +0530 Message-ID: <20260204210125.613350-3-mkchauras@gmail.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260204210125.613350-1-mkchauras@gmail.com> References: <20260204210125.613350-1-mkchauras@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable From: Link Mauve For now only Big Endian 32-bit PowerPC is supported, as that is the only hardware I have. This has been tested on the Nintendo Wii so far, but I plan on also using it on the GameCube, Wii U and Apple G4. These changes aren=E2=80=99t the only ones required to get the kernel to co= mpile and link on PowerPC, libcore will also have to be changed to not use integer division to format u64, u128 and core::time::Duration, otherwise __udivdi3() and __umoddi3() will have to be added. I have tested this change by replacing the three implementations with unimplemented!() and it linked just fine. Signed-off-by: Link Mauve Signed-off-by: Mukesh Kumar Chaurasiya (IBM) --- Documentation/rust/arch-support.rst | 1 + arch/powerpc/Kconfig | 1 + arch/powerpc/Makefile | 2 ++ rust/Makefile | 4 +++- 4 files changed, 7 insertions(+), 1 deletion(-) diff --git a/Documentation/rust/arch-support.rst b/Documentation/rust/arch-= support.rst index 6e6a515d0899..e26a94808e97 100644 --- a/Documentation/rust/arch-support.rst +++ b/Documentation/rust/arch-support.rst @@ -18,6 +18,7 @@ Architecture Level of support Constraints ``arm`` Maintained ARMv7 Little Endian only. ``arm64`` Maintained Little Endian only. ``loongarch`` Maintained \- +``powerpc`` Experimental 32-bit Big Endian only. ``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 9537a61ebae0..17db23b82e91 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -283,6 +283,7 @@ config PPC select HAVE_REGS_AND_STACK_ACCESS_API select HAVE_RELIABLE_STACKTRACE select HAVE_RSEQ + select HAVE_RUST if PPC32 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 a58b1029592c..9fd82c75dcbd 100644 --- a/arch/powerpc/Makefile +++ b/arch/powerpc/Makefile @@ -61,6 +61,8 @@ else KBUILD_LDFLAGS_MODULE +=3D $(objtree)/arch/powerpc/lib/crtsavres.o endif =20 +KBUILD_RUSTFLAGS +=3D --target=3Dpowerpc-unknown-linux-gnu + ifdef CONFIG_CPU_LITTLE_ENDIAN KBUILD_CPPFLAGS +=3D -mlittle-endian KBUILD_LDFLAGS +=3D -EL diff --git a/rust/Makefile b/rust/Makefile index 4dcc2eff51cb..ae22f2c5f0b3 100644 --- a/rust/Makefile +++ b/rust/Makefile @@ -384,13 +384,15 @@ bindgen_skip_c_flags :=3D -mno-fp-ret-in-387 -mprefer= red-stack-boundary=3D% \ -fstrict-flex-arrays=3D% -fmin-function-alignment=3D% \ -fzero-init-padding-bits=3D% -mno-fdpic \ -fdiagnostics-show-context -fdiagnostics-show-context=3D% \ - --param=3D% --param asan-% -fno-isolate-erroneous-paths-dereference + --param=3D% --param asan-% -fno-isolate-erroneous-paths-dereference \ + -ffixed-r2 -mmultiple -mno-readonly-in-sdata =20 # Derived from `scripts/Makefile.clang`. 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Wed, 04 Feb 2026 13:02:33 -0800 (PST) Received: from li-1a3e774c-28e4-11b2-a85c-acc9f2883e29.ibm.com.com ([106.51.164.193]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-8241d1bd466sm3277977b3a.20.2026.02.04.13.02.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Feb 2026 13:02:33 -0800 (PST) From: "Mukesh Kumar Chaurasiya (IBM)" To: linkmauve@linkmauve.fr, ojeda@kernel.org, boqun.feng@gmail.com, gary@garyguo.net, bjorn3_gh@protonmail.com, lossin@kernel.org, a.hindborg@kernel.org, aliceryhl@google.com, tmgross@umich.edu, dakr@kernel.org, corbet@lwn.net, maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com, chleroy@kernel.org, peterz@infradead.org, jpoimboe@kernel.org, jbaron@akamai.com, rostedt@goodmis.org, ardb@kernel.org, rust-for-linux@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Cc: "Mukesh Kumar Chaurasiya (IBM)" Subject: [PATCH V2 3/3] powerpc: Enable Rust for ppc64le Date: Thu, 5 Feb 2026 02:31:25 +0530 Message-ID: <20260204210125.613350-4-mkchauras@gmail.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260204210125.613350-1-mkchauras@gmail.com> References: <20260204210125.613350-1-mkchauras@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 =3D "he= llo, world" [ 843.410977] rust_print: Arc says 42 [ 843.410979] rust_print: Arc says hello, world $ sudo rmmod rust_print [ 843.411003] rust_print: "hello, world" [ 888.499935] rust_print: Rust printing macros sample (exit) Signed-off-by: Mukesh Kumar Chaurasiya (IBM) Reviewed-by: Christophe Leroy (CS GROUP) Reviewed-by: Link Mauve Tested-by: Link Mauve --- Documentation/rust/arch-support.rst | 2 +- arch/powerpc/Kconfig | 2 +- arch/powerpc/Makefile | 9 ++++++++- rust/Makefile | 9 ++++++++- 4 files changed, 18 insertions(+), 4 deletions(-) diff --git a/Documentation/rust/arch-support.rst b/Documentation/rust/arch-= support.rst index e26a94808e97..627471ac9238 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`` Experimental 32-bit Big Endian only. +``powerpc`` Experimental 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..c5dd03713af2 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -283,7 +283,7 @@ config PPC select HAVE_REGS_AND_STACK_ACCESS_API select HAVE_RELIABLE_STACKTRACE select HAVE_RSEQ - select HAVE_RUST if PPC32 + select HAVE_RUST if PPC32 || (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..f93816ddc036 100644 --- a/arch/powerpc/Makefile +++ b/arch/powerpc/Makefile @@ -61,7 +61,14 @@ else KBUILD_LDFLAGS_MODULE +=3D $(objtree)/arch/powerpc/lib/crtsavres.o endif =20 -KBUILD_RUSTFLAGS +=3D --target=3Dpowerpc-unknown-linux-gnu +ifdef CONFIG_PPC64 +ifdef CONFIG_CPU_LITTLE_ENDIAN +KBUILD_RUSTFLAGS +=3D --target=3Dpowerpc64le-unknown-linux-gnu +endif +KBUILD_RUSTFLAGS +=3D -Ctarget-feature=3D-mma,-vsx,-hard-float,-altivec +else +KBUILD_RUSTFLAGS +=3D --target=3Dpowerpc-unknown-linux-gnu +endif =20 ifdef CONFIG_CPU_LITTLE_ENDIAN KBUILD_CPPFLAGS +=3D -mlittle-endian diff --git a/rust/Makefile b/rust/Makefile index ae22f2c5f0b3..c3961fd0d9a4 100644 --- a/rust/Makefile +++ b/rust/Makefile @@ -392,10 +392,17 @@ BINDGEN_TARGET_x86 :=3D x86_64-linux-gnu BINDGEN_TARGET_arm64 :=3D aarch64-linux-gnu BINDGEN_TARGET_arm :=3D arm-linux-gnueabi BINDGEN_TARGET_loongarch :=3D loongarch64-linux-gnusf -BINDGEN_TARGET_powerpc :=3D powerpc-linux-gnu BINDGEN_TARGET_um :=3D $(BINDGEN_TARGET_$(SUBARCH)) BINDGEN_TARGET :=3D $(BINDGEN_TARGET_$(SRCARCH)) =20 +ifdef CONFIG_PPC64 +ifdef CONFIG_CPU_LITTLE_ENDIAN +BINDGEN_TARGET_powerpc :=3D powerpc64le-linux-gnu +endif +else +BINDGEN_TARGET_powerpc :=3D powerpc-linux-gnu +endif + # All warnings are inhibited since GCC builds are very experimental, # many GCC warnings are not supported by Clang, they may only appear in # some configurations, with new GCC versions, etc. --=20 2.52.0