From nobody Sat Feb 7 16:39:29 2026 Received: from mail-dl1-f54.google.com (mail-dl1-f54.google.com [74.125.82.54]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6DC69360735 for ; Wed, 4 Feb 2026 06:27:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.54 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770186472; cv=none; b=Dz8hfpe+hdS+X64e0s+vPXGLmhx00MRZ5S5ZHkpkj8U+jj0omGIBTCIfXmfbbf3b43aBgGkfxpQRey2UuqpEYC4MfwqQVvUfKxhhQmgAOxwJWjjrSByLcQKfgdo3PMYits2kayJ0ACJ/R0L3mVKDaDoqJ8otDDH2CQ+QHcwFng4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770186472; c=relaxed/simple; bh=Nu0j7/QTMwXNybcCccfMDqePArqp9NasPFKFagIBk5w=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=E+9G0TEkOFlfrRcCkcfsue9kkQFBKIuMCi6Z2SWOXGUlygBmgTVO0UP7eKPByO1fiaC841gpUeQOpxj5SouqG9TRN/gsv4OSN1/B/7T9cD1qArTAaA/b7fVnXBj8pmqf7QFBSclJSkgpnfaOwc1IaFzWKrQYNxRVHAO9md6rbUI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=ZClmwnFu; arc=none smtp.client-ip=74.125.82.54 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ZClmwnFu" Received: by mail-dl1-f54.google.com with SMTP id a92af1059eb24-11f1fb91996so4439276c88.1 for ; Tue, 03 Feb 2026 22:27:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1770186471; x=1770791271; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=VL5of/f5KyDAfjTDwdEWFiFC2+YlHapoLTi3UvRqx5s=; b=ZClmwnFu/au/IM/Ca6VES/xt956Tyiezah9C4dD+evB9pdv7cVPgbg9Bx8jyVYA9T8 ZJlzkKSzMke2+JDVLwL18UC2NdPBasn1hiAHuDdJA2126pkGbJQgG/DedOVh754KS2CO EaUebeJWx2VEU97JNchLFbGv+YIEplRmZmTYaoHNAy8JXq8EOGicA/MRmeReH3w3ZnVt EAn5uBFa3BwXwDY/qw7QfGuJ8ZCoOnyNQIzkrWjdmphx7RaxIGp2ejjNHAOkM5Q6StWj j9+M3Zi2DxxPMl+NEkhH1+Laii75YISlfYbQNvkmyeBM0vT//gbPzpNnDRC1VxMXrFKe Kuag== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1770186471; x=1770791271; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=VL5of/f5KyDAfjTDwdEWFiFC2+YlHapoLTi3UvRqx5s=; b=Ve5Y84ZOaR37L9ZjUYJOFUlSU1ZLmDIQNW8azKPgbStX9pD0J+c82mSbnmtJuSREr5 j2t7iZg+bhe+ye+AIpQcAJ85t+RSHSQHJbPZsItUrKNO+KQEDRLE8mK8Bo/0VvBhTLze GHetjT7sGB/rnUNzNBjzMmJFIa1+td38fKLPiQ2niOM04SOBZILlAoLaR/4hghqWQuWr sYXvqSzdRoPJe3DLzart3l5xmIW7SUjWqYcd7fvVsXw/nRhfZHx8zAwWZ+1ZHHHPCDgO roRnOYW1ae8pH7Xo8y36Lu425nf6q3Nsc0+bdxFdW5/zh7BdJEfEw72rdOSDY341WsoV kvlA== X-Forwarded-Encrypted: i=1; AJvYcCUxNAGJ7ra84CTRkVd0C1ltOcXnTqUIYE0W5LPzvpXpf+TwwKEFNnwQckzjPaSgoBC4qRTdP6sIpryLnV0=@vger.kernel.org X-Gm-Message-State: AOJu0YwGDkKHXuE/A8c4dGnHAhMxg1uyIlQCMl7YJcqQFmAI7bAcGLrc 1RKkvqCsk/stLBDzJd9xuVj8Fmy/Mvkf3syXvkCeZqOlypc2UIR6Ody0SGGC4g== X-Gm-Gg: AZuq6aLTtYLmG9x0ZPCFTVCozhp1yE3T5hlVY2jGrXesC3GgbKWz8wx26PG3xiqS025 9P9Q0vgg86OVZ+ApwuYDTemrrOYsReY3WSO9jwsoo0yguVpRW5dt5L0nB8uEToVGdRrAaUd9i5M IzfOmU5fSrJPghaYKtkUVd/YD/FMvkvzU85TAJJQ5AIGVs+5Np+xdrRZka4kYNCYRtrhrVjpiCP G/9ulrdKFM7xm/1tv8NAgpHBcYtUfRNWd/eDjbw59+5+GOXS+0bRgZfTjzKohCXabVZm4PCawCC K5kpnu79yMo8M8TrmGIeqAT2hi3oZIR4H2okKoWQ0j7FmA+4/dlu4iCSXmO0zI13PgZ7t75pem8 GK6NeTrJkvFART/1gKD9Xkruf45/sOvyMISR+dM+yzjdOCJoUILZZrPPI6Ajm340k/ctkxBSqp3 IzBHZ1Bnbkr4h9gdmNNy4UwjyGGVkqtf3fTe/BnTZI0ooAWQVt7QF01JsDDWE= X-Received: by 2002:a17:90b:2889:b0:335:2747:a9b3 with SMTP id 98e67ed59e1d1-3548720a3eamr1376264a91.32.1770179086053; Tue, 03 Feb 2026 20:24:46 -0800 (PST) Received: from li-1a3e774c-28e4-11b2-a85c-acc9f2883e29.in.ibm.com ([129.41.58.2]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-35485eb8d4csm1017430a91.10.2026.02.03.20.24.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Feb 2026 20:24:45 -0800 (PST) From: "Mukesh Kumar Chaurasiya (IBM)" To: 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, 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, nathan@kernel.org, nick.desaulniers+lkml@gmail.com, morbo@google.com, justinstitt@google.com, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, llvm@lists.linux.dev Cc: "Mukesh Kumar Chaurasiya (IBM)" Subject: [PATCH] powerpc: Enable Rust for ppc64le Date: Wed, 4 Feb 2026 09:54:17 +0530 Message-ID: <20260204042417.83903-1-mkchauras@gmail.com> X-Mailer: git-send-email 2.52.0 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 ppc64 only. To support rust a new macro ARCH_STATIC_BRANCH_ASM in powerpc is added to avoid duplication of inline asm between C and Rust. This is inline with commit aecaf181651c '("jump_label: adjust inline asm to be consistent")' 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) --- arch/powerpc/Kconfig | 1 + arch/powerpc/Makefile | 9 +++++---- arch/powerpc/include/asm/jump_label.h | 23 +++++++++++++---------- rust/Makefile | 1 + scripts/generate_rust_target.rs | 24 ++++++++++++++++++++++++ 5 files changed, 44 insertions(+), 14 deletions(-) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 9537a61ebae0..e9b8d761ed52 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -285,6 +285,7 @@ config PPC select HAVE_RSEQ 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_RUST if PPC64 select HAVE_SETUP_PER_CPU_AREA if PPC64 select HAVE_SOFTIRQ_ON_OWN_STACK select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,$(m32-flag) -mstack-p= rotector-guard=3Dtls -mstack-protector-guard-reg=3Dr2 -mstack-protector-gua= rd-offset=3D0) diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile index a58b1029592c..7ad28cf0fd35 100644 --- a/arch/powerpc/Makefile +++ b/arch/powerpc/Makefile @@ -172,10 +172,11 @@ CFLAGS-y +=3D $(CONFIG_TUNE_CPU) =20 asinstr :=3D $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=3D1) =20 -KBUILD_CPPFLAGS +=3D -I $(srctree)/arch/powerpc $(asinstr) -KBUILD_AFLAGS +=3D $(AFLAGS-y) -KBUILD_CFLAGS +=3D $(CC_FLAGS_NO_FPU) -KBUILD_CFLAGS +=3D $(CFLAGS-y) +KBUILD_CPPFLAGS +=3D -I $(srctree)/arch/powerpc $(asinstr) +KBUILD_AFLAGS +=3D $(AFLAGS-y) +KBUILD_CFLAGS +=3D $(CC_FLAGS_NO_FPU) +KBUILD_CFLAGS +=3D $(CFLAGS-y) +KBUILD_RUSTFLAGS +=3D -Ctarget-feature=3D-mma,-vsx,-hard-float,-alt= ivec =20 CHECKFLAGS +=3D -m$(BITS) -D__powerpc__ -D__powerpc$(BITS)__ ifdef CONFIG_CPU_BIG_ENDIAN 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); =20 return false; @@ -34,10 +40,7 @@ static __always_inline bool arch_static_branch_jump(stru= ct static_key *key, bool { asm goto("1:\n\t" "b %l[l_yes] # arch_static_branch_jump\n\t" - ".pushsection __jump_table, \"aw\"\n\t" - ".long 1b - ., %l[l_yes] - .\n\t" - JUMP_ENTRY_TYPE "%c0 - .\n\t" - ".popsection \n\t" + JUMP_TABLE_ENTRY("%c0", "%l[l_yes]") : : "i" (&((char *)key)[branch]) : : l_yes); =20 return false; diff --git a/rust/Makefile b/rust/Makefile index 5d357dce1704..7a6daa822cbc 100644 --- a/rust/Makefile +++ b/rust/Makefile @@ -390,6 +390,7 @@ 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 powerpc64le-linux-gnu BINDGEN_TARGET_um :=3D $(BINDGEN_TARGET_$(SUBARCH)) BINDGEN_TARGET :=3D $(BINDGEN_TARGET_$(SRCARCH)) =20 diff --git a/scripts/generate_rust_target.rs b/scripts/generate_rust_target= .rs index 38b3416bb979..875579b37424 100644 --- a/scripts/generate_rust_target.rs +++ b/scripts/generate_rust_target.rs @@ -256,6 +256,30 @@ fn main() { } } else if cfg.has("LOONGARCH") { panic!("loongarch uses the builtin rustc loongarch64-unknown-none-= softfloat target"); + } else if cfg.has("PPC64") { + ts.push("arch", "powerpc64"); + ts.push( + "data-layout", + if cfg.has("CPU_LITTLE_ENDIAN") { + "e-m:e-Fn32-i64:64-n32:64-S128-v256:256:256-v512:512:512" + } else { + "E-m:e-Fn32-i64:64-n32:64-S128-v256:256:256-v512:512:512" + }, + ); + ts.push("features", "-mma,-altivec,-vsx,-hard-float"); + ts.push( + "llvm-target", + if cfg.has("CPU_LITTLE_ENDIAN") { + "powerpc64le-linux-gnu" + } else { + "powerpc64-linux-gnu" + }, + ); + if cfg.rustc_version_atleast(1, 91, 0) { + ts.push("target-pointer-width", 64); + } else { + ts.push("target-pointer-width", "64"); + } } else { panic!("Unsupported architecture"); } --=20 2.52.0