From: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> To: Linus Walleij <linus.walleij@linaro.org> Cc: Wedson Almeida Filho <wedsonaf@google.com>, Peter Zijlstra <peterz@infradead.org>, Miguel Ojeda <ojeda@kernel.org>, Linus Torvalds <torvalds@linux-foundation.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, rust-for-linux <rust-for-linux@vger.kernel.org>, linux-kbuild <linux-kbuild@vger.kernel.org>, Linux Doc Mailing List <linux-doc@vger.kernel.org>, linux-kernel <linux-kernel@vger.kernel.org> Subject: Re: [PATCH 00/13] [RFC] Rust support Date: Wed, 28 Apr 2021 05:10:09 +0200 [thread overview] Message-ID: <CANiq72m9V3dVG59jAoR-OM+7QtJauQgrix3DZkw=oCuaaf3H5w@mail.gmail.com> (raw) In-Reply-To: <CACRpkdYodGnURuaYMBwVAY=8bU0PQoPAvTp34uYksPFmxBsT2A@mail.gmail.com> On Tue, Apr 27, 2021 at 1:13 PM Linus Walleij <linus.walleij@linaro.org> wrote: > > Actually my reply to Wedson brought up a new issue, which is the > quality of learning resources and the lack of an equivalent to > The C Programming Language book. I recall having a similar feeling when initially jumping into individual chapters of The Rust Programming Language book. I think it is intended to be read from cover to cover instead. There are other resources, see [1]. For instance, there is The Embedded Rust Book [2]. Some of those are a WIP, but perhaps others can recommend better finished/published books. In any case, Rust has more features than C, some of them quite unique, and they are routinely used, so it does take some time to learn. [1] https://www.rust-lang.org/learn [2] https://docs.rust-embedded.org/book/ > I think a good starting point would be to either fix Rust support in > GCC or implement some more important ISAs in LLVM, > whichever is easiest. I don't mind having just *one* compiler but > I mind having *a* compiler for every arch we support. > > [...] > > Portability to old systems and ISAs is a virtue in itself > because of the effect it has on code quality, not necessarily > for the support itself. I agree that there are benefits of keeping compiler technology flexible, but one cannot force or expect any project (including the Linux kernel) to maintain all code forever. In the end, we need to balance that adaptability against the benefits of adding Rust. In particular because nowadays LLVM is able to cover the majority of devices that want to run the very latest Linux kernels. Thus those benefits apply to most users. If LLVM only supported, say, x86_64, I would agree that it would not be enough. By contrast, compiler flexibility only matters indirectly to users, and at some point there are diminishing returns to keeping all architectures around. In any case, adding Rust (in particular for "leaf" modules) does not imply that we will lose those architectures any time soon. That would take at least several years, and would require quite a few things to happen at the same time: - That Rust got so widely used in the kernel (because the benefits turned out to be important) that maintainers went as far as wanting to drop C drivers from mainline for Rust equivalents. - That GCC did not get any way to compile Rust (no Rust frontend for GCC, no GCC backend for `rustc`, etc.) and, moreover, that the plans for that had been dropped. - That LLVM did not add support for the missing architectures. The first point is unlikely any time soon. The second point is unlikely, too, given there is funding for that now (and I assume those projects will receive more support if Rust lands in the kernel). The third point is likely, though. Cheers, Miguel
next prev parent reply other threads:[~2021-04-28 3:10 UTC|newest] Thread overview: 201+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-04-14 18:45 ojeda 2021-04-14 18:45 ` [PATCH 01/13] kallsyms: Support "big" kernel symbols (2-byte lengths) ojeda 2021-04-14 19:44 ` Matthew Wilcox 2021-04-14 19:59 ` Miguel Ojeda 2021-04-14 18:45 ` [PATCH 02/13] kallsyms: Increase maximum kernel symbol length to 512 ojeda 2021-04-14 23:48 ` Nick Desaulniers 2021-04-14 18:45 ` [PATCH 03/13] Makefile: Generate CLANG_FLAGS even in GCC builds ojeda 2021-04-14 18:59 ` Nathan Chancellor 2021-04-15 10:18 ` Miguel Ojeda 2021-04-14 23:46 ` Nick Desaulniers 2021-04-15 0:47 ` Miguel Ojeda 2021-04-14 18:45 ` [PATCH 04/13] Kbuild: Rust support ojeda 2021-04-14 23:19 ` Nick Desaulniers 2021-04-15 0:43 ` Miguel Ojeda 2021-04-15 18:03 ` Nick Desaulniers 2021-04-16 12:23 ` Miguel Ojeda 2021-04-17 19:35 ` Masahiro Yamada 2021-04-16 13:38 ` Peter Zijlstra 2021-04-16 17:05 ` Linus Torvalds 2021-04-16 17:47 ` Miguel Ojeda 2021-04-16 18:09 ` Al Viro 2021-04-16 18:57 ` Miguel Ojeda 2021-04-16 20:22 ` Willy Tarreau 2021-04-16 20:34 ` Connor Kuehl 2021-04-16 20:58 ` Willy Tarreau 2021-04-16 21:39 ` Miguel Ojeda 2021-04-16 22:04 ` Willy Tarreau 2021-04-16 22:45 ` Al Viro 2021-04-16 23:46 ` Miguel Ojeda 2021-04-17 4:24 ` Willy Tarreau 2021-04-17 15:38 ` Miguel Ojeda 2021-04-16 21:19 ` Miguel Ojeda 2021-04-16 17:34 ` Miguel Ojeda 2021-04-19 19:58 ` David Sterba 2021-04-19 20:17 ` Matthew Wilcox 2021-04-19 21:03 ` Miguel Ojeda 2021-04-19 20:54 ` Miguel Ojeda 2021-04-14 18:45 ` [PATCH 05/13] Rust: Compiler builtins crate ojeda 2021-04-14 19:19 ` Linus Torvalds 2021-04-14 19:34 ` Miguel Ojeda 2021-04-14 18:45 ` [PATCH 06/13] Rust: Module crate ojeda 2021-04-14 18:45 ` [PATCH 07/13] Rust: Kernel crate ojeda 2021-04-14 19:31 ` Linus Torvalds 2021-04-14 19:50 ` Miguel Ojeda 2021-04-14 18:45 ` [PATCH 08/13] Rust: Export generated symbols ojeda 2021-04-14 18:46 ` [PATCH 09/13] Samples: Rust examples ojeda 2021-04-14 19:34 ` Linus Torvalds 2021-04-14 19:42 ` Miguel Ojeda 2021-04-14 19:49 ` Matthew Wilcox 2021-04-16 11:46 ` Andrej Shadura 2021-04-14 23:24 ` Nick Desaulniers 2021-04-15 7:10 ` Greg Kroah-Hartman 2021-04-15 7:39 ` Nick Desaulniers 2021-04-15 12:42 ` Miguel Ojeda 2021-04-16 13:07 ` Sven Van Asbroeck 2021-04-16 13:20 ` Greg Kroah-Hartman 2021-04-14 18:46 ` [PATCH 10/13] Documentation: Rust general information ojeda 2021-04-14 22:17 ` Nick Desaulniers 2021-04-14 23:34 ` Miguel Ojeda 2021-04-14 18:46 ` [PATCH 11/13] MAINTAINERS: Rust ojeda 2021-04-14 21:55 ` Nick Desaulniers 2021-04-14 22:02 ` Miguel Ojeda 2021-04-14 22:36 ` Nick Desaulniers 2021-04-14 18:46 ` [PATCH 12/13] Rust: add abstractions for Binder (WIP) ojeda 2021-04-14 18:46 ` [PATCH 13/13] Android: Binder IPC in Rust (WIP) ojeda 2021-04-14 19:44 ` [PATCH 00/13] [RFC] Rust support Linus Torvalds 2021-04-14 20:20 ` Miguel Ojeda 2021-04-15 1:38 ` Kees Cook 2021-04-15 8:26 ` David Laight 2021-04-15 18:08 ` Kees Cook 2021-04-15 12:39 ` Miguel Ojeda 2021-04-14 20:09 ` Matthew Wilcox 2021-04-14 20:21 ` Linus Torvalds 2021-04-14 20:35 ` Josh Triplett 2021-04-14 22:08 ` David Laight 2021-04-14 20:29 ` Miguel Ojeda 2021-04-18 15:31 ` Wedson Almeida Filho 2021-04-15 0:22 ` Nick Desaulniers 2021-04-15 10:05 ` Miguel Ojeda 2021-04-15 18:58 ` Peter Zijlstra 2021-04-16 2:22 ` Wedson Almeida Filho 2021-04-16 4:25 ` Al Viro 2021-04-16 5:02 ` Wedson Almeida Filho 2021-04-16 5:39 ` Paul Zimmerman 2021-04-16 7:46 ` Peter Zijlstra 2021-04-16 7:09 ` Peter Zijlstra 2021-04-17 5:23 ` comex 2021-04-17 12:46 ` David Laight 2021-04-17 14:51 ` Paolo Bonzini 2021-04-19 7:32 ` Peter Zijlstra 2021-04-19 7:53 ` Paolo Bonzini 2021-04-19 8:26 ` Peter Zijlstra 2021-04-19 8:35 ` Peter Zijlstra 2021-04-19 9:02 ` Paolo Bonzini 2021-04-19 9:36 ` Peter Zijlstra 2021-04-19 9:40 ` Paolo Bonzini 2021-04-19 11:01 ` Will Deacon 2021-04-19 17:14 ` Linus Torvalds 2021-04-19 18:38 ` Paolo Bonzini 2021-04-19 18:50 ` Linus Torvalds 2021-04-22 10:03 ` Linus Walleij 2021-04-22 14:09 ` David Laight 2021-04-22 15:24 ` Wedson Almeida Filho 2021-04-26 0:18 ` Linus Walleij 2021-04-26 14:26 ` Miguel Ojeda 2021-04-26 14:40 ` Wedson Almeida Filho 2021-04-26 16:03 ` Miguel Ojeda 2021-04-27 10:54 ` Linus Walleij 2021-04-27 11:13 ` Robin Randhawa 2021-04-29 1:52 ` Wedson Almeida Filho 2021-04-26 18:01 ` Miguel Ojeda 2021-04-22 21:28 ` Miguel Ojeda 2021-04-26 0:31 ` Linus Walleij 2021-04-26 18:18 ` Miguel Ojeda 2021-04-27 11:13 ` Linus Walleij 2021-04-28 2:51 ` Kyle Strand 2021-04-28 3:10 ` Miguel Ojeda [this message] 2021-05-04 21:21 ` Linus Walleij 2021-05-04 23:30 ` Miguel Ojeda 2021-05-05 11:34 ` Linus Walleij 2021-05-05 14:17 ` Miguel Ojeda 2021-05-05 15:13 ` Enrico Weigelt, metux IT consult 2021-05-06 12:47 ` Linus Walleij 2021-05-07 18:23 ` Miguel Ojeda 2021-04-16 4:27 ` Boqun Feng 2021-04-16 6:04 ` Nick Desaulniers 2021-04-16 18:47 ` Paul E. McKenney 2021-04-19 20:35 ` Nick Desaulniers 2021-04-19 21:37 ` Paul E. McKenney 2021-04-19 22:03 ` Miguel Ojeda 2021-04-16 20:48 ` Josh Triplett 2021-04-16 8:16 ` Michal Kubecek 2021-04-16 9:29 ` Willy Tarreau 2021-04-16 11:24 ` Peter Zijlstra 2021-04-16 13:07 ` Wedson Almeida Filho 2021-04-16 14:19 ` Peter Zijlstra 2021-04-16 15:04 ` Miguel Ojeda 2021-04-16 15:43 ` Peter Zijlstra 2021-04-16 16:21 ` Miguel Ojeda 2021-04-16 15:33 ` Wedson Almeida Filho 2021-04-16 16:14 ` Willy Tarreau 2021-04-16 17:10 ` Miguel Ojeda 2021-04-16 17:18 ` Peter Zijlstra 2021-04-16 18:08 ` Matthew Wilcox 2021-04-17 11:17 ` Peter Zijlstra 2021-04-17 11:46 ` Willy Tarreau 2021-04-17 14:24 ` Peter Zijlstra 2021-04-17 14:36 ` Willy Tarreau 2021-04-17 13:46 ` David Laight 2021-04-16 17:37 ` Willy Tarreau 2021-04-16 17:46 ` Connor Kuehl 2021-04-20 0:24 ` Nick Desaulniers 2021-04-20 3:47 ` Willy Tarreau 2021-04-20 5:56 ` Greg Kroah-Hartman 2021-04-20 6:16 ` Willy Tarreau 2021-04-29 15:38 ` peter enderborg 2021-04-17 13:53 ` Wedson Almeida Filho 2021-04-17 14:21 ` Willy Tarreau 2021-04-17 15:23 ` Miguel Ojeda 2021-04-18 15:51 ` Wedson Almeida Filho 2021-04-17 12:41 ` David Laight 2021-04-17 13:01 ` Wedson Almeida Filho 2021-04-16 15:03 ` Matthew Wilcox 2021-04-17 13:29 ` Wedson Almeida Filho 2021-04-16 15:58 ` Theodore Ts'o 2021-04-16 16:21 ` Wedson Almeida Filho 2021-04-17 15:11 ` Paolo Bonzini 2021-04-16 14:21 ` Miguel Ojeda 2021-04-17 20:42 ` Richard Weinberger 2021-04-28 18:34 ` Mariusz Ceier 2021-04-28 20:25 ` Nick Desaulniers 2021-04-28 21:21 ` David Laight 2021-04-29 11:14 ` Kajetan Puchalski 2021-04-29 11:25 ` Kajetan Puchalski 2021-04-29 14:06 ` Mariusz Ceier 2021-04-29 14:13 ` Sven Van Asbroeck 2021-04-29 14:26 ` Willy Tarreau 2021-04-29 15:06 ` Al Viro 2021-04-29 16:09 ` Mariusz Ceier 2021-04-30 6:39 ` Thomas Schoebel-Theuer 2021-04-30 8:30 ` David Laight 2021-05-05 13:58 ` Enrico Weigelt, metux IT consult 2021-05-05 14:41 ` Miguel Ojeda 2022-06-20 15:11 ` Olliver Schinagl 2022-06-27 17:44 ` Miguel Ojeda 2022-07-18 6:56 ` Olliver Schinagl 2022-07-20 19:23 ` Miguel Ojeda 2022-07-20 20:21 ` Nicolas Pitre 2022-07-27 7:47 ` Olliver Schinagl 2022-07-27 13:32 ` Nicolas Pitre 2022-07-27 8:05 ` Olliver Schinagl 2022-07-28 10:21 ` Gary Guo 2022-07-28 12:09 ` Greg Kroah-Hartman 2022-07-28 12:28 ` Gary Guo 2022-07-28 20:45 ` Olliver Schinagl 2022-07-29 8:04 ` Greg Kroah-Hartman 2022-07-28 20:43 ` Olliver Schinagl 2021-04-29 5:20 Mariusz Ceier 2021-04-29 5:21 Mariusz Ceier 2021-04-29 8:18 ` David Laight 2021-07-30 23:22 Dillan Jackson
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