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McKenney" , "Nathan Chancellor" , "Nick Desaulniers" , "Bill Wendling" , "Justin Stitt" , , , , , Subject: Re: [PATCH v2 5/6] ARM: rust: Enable Rust support for ARMv4T From: "Gary Guo" To: "Karl Mehltretter" , "Russell King" , "Miguel Ojeda" X-Mailer: aerc 0.22.0 References: <20261008053746.49631-1-kmehltretter@gmail.com> <20261008053746.49631-6-kmehltretter@gmail.com> In-Reply-To: <20261008053746.49631-6-kmehltretter@gmail.com> X-ClientProxiedBy: BE1P281CA0174.DEUP281.PROD.OUTLOOK.COM (2603:10a6:b10:66::20) To LOAP265MB8560.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:4ab::19) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LOAP265MB8560:EE_|LO4P265MB6089:EE_ X-MS-Office365-Filtering-Correlation-Id: eaeb9e78-3b02-47c4-94a0-08df251bc7e5 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|1800799024|23010399003|366016|6133799003|18002099003|22082099003|10067099003|3023799007|4143699003|5023799004|56012099006; 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Kernels that > contain an ARMv4T CPU are excluded from Rust for that reason. > > Nothing else in the Rust code depends on ARMv5. Use rustc's > armv4t-unknown-linux-gnueabi target for these kernels. Like the C code, > the Rust code of a combined ARMv4T and ARMv5 kernel is then built for > ARMv4T. > > ARMv4 (StrongARM, FA526) stays excluded. It has no bx and rustc has no > target for it. > > Tested in QEMU sx1 (OMAP310, ARM925T) with omap1_defconfig. The Rust > samples, all Rust KUnit suites and the doctests pass with the current > and with the minimum tool versions. > > at91_dt_defconfig combines ARMv4T and ARMv5 and is built for ARMv4T. > That kernel passes the same tests on a Microchip SAM9X75 Curiosity > board (ARM926EJ-S). > > Assisted-by: LLM > Signed-off-by: Karl Mehltretter > --- > Documentation/rust/arch-support.rst | 8 ++++---- > arch/arm/Kconfig | 2 +- > arch/arm/Makefile | 1 + > 3 files changed, 6 insertions(+), 5 deletions(-) > > diff --git a/Documentation/rust/arch-support.rst b/Documentation/rust/arc= h-support.rst > index d6d1bef44c8f..3f39cf55b6f4 100644 > --- a/Documentation/rust/arch-support.rst > +++ b/Documentation/rust/arch-support.rst > @@ -12,15 +12,15 @@ which uses ``libclang``. > Below is a general summary of architectures that currently work. Level o= f > support corresponds to ``S`` values in the ``MAINTAINERS`` file. > =20 > -=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D > +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > Architecture Level of support Constraints > -=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D > -``arm`` Maintained ARMv5TE, ARMv6K and ARMv7, Little Endia= n only. > +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > +``arm`` Maintained ARMv4T, ARMv5TE, ARMv6K and ARMv7, Litt= le Endian only. Can we say "ARMv4T or above" or something similar? Best, Gary > ``arm64`` Maintained Little Endian only. > ``loongarch`` Maintained \- > ``riscv`` Maintained ``riscv64`` and LLVM/Clang only. > ``s390`` Maintained ``CONFIG_EXPOLINE`` must be disabled. > ``um`` Maintained \- > ``x86`` Maintained ``x86_64`` only. > -=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D > +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D