linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Linus Torvalds <torvalds@linux-foundation.org>
To: Alex Gaynor <alex.gaynor@gmail.com>
Cc: Wedson Almeida Filho <wedsonaf@gmail.com>,
	Matthew Wilcox <willy@infradead.org>,
	Kees Cook <keescook@chromium.org>,
	Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>,
	Konstantin Shelekhin <k.shelekhin@yadro.com>,
	ojeda@kernel.org, ark.email@gmail.com, bjorn3_gh@protonmail.com,
	bobo1239@web.de, bonifaido@gmail.com, boqun.feng@gmail.com,
	davidgow@google.com, dev@niklasmohrin.de,
	dsosnowski@dsosnowski.pl, foxhlchen@gmail.com, gary@garyguo.net,
	geofft@ldpreload.com, gregkh@linuxfoundation.org,
	jarkko@kernel.org, john.m.baublitz@gmail.com,
	leseulartichaut@gmail.com, linux-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org, me@kloenk.de, milan@mdaverde.com,
	mjmouse9999@gmail.com, patches@lists.linux.dev,
	rust-for-linux@vger.kernel.org, thesven73@gmail.com,
	viktor@v-gar.de, Andreas Hindborg <andreas.hindborg@wdc.com>
Subject: Re: [PATCH v9 12/27] rust: add `kernel` crate
Date: Mon, 19 Sep 2022 17:15:13 -0700	[thread overview]
Message-ID: <CAHk-=wj6sDFk8ZXSEKUMj-J9zfrMSSO3jhBEaveVaJSUpr=O=w@mail.gmail.com> (raw)
In-Reply-To: <CAHk-=wiyD6KqZN8jFkMHPRPxrbyJEUDRP6+WaH9Q9hjDB5i1zg@mail.gmail.com>

On Mon, Sep 19, 2022 at 4:58 PM Linus Torvalds
<torvalds@linux-foundation.org> wrote:
>
> This is not some kind of "a few special things".
>
> This is things like absolutely _anything_ that allocates memory, or
> takes a lock, or does a number of other things.

Examples of "number of other things" ends up being things like
"accessing user memory", which depending on what you are doing may be
very common too.

And btw, it's not only about the (multiple kinds of) atomic regions.

We have other context rules in the kernel too, like "does floating
point or vector unit calculations". Which you can actually do, but
only in a kernel_fpu_begin/kernel_fpu_end region.

Now, the floating point thing is rare enough that it's probably fine
to just say "no floating point at all in Rust code".  It tends to be
very special code, so you'd write it in C or inline assembly, because
you're doing special things like using the vector unit for crypto
hashes using special CPU instructions.

                  Linus

  reply	other threads:[~2022-09-20  0:15 UTC|newest]

Thread overview: 103+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-05 15:41 [PATCH v9 00/27] Rust support Miguel Ojeda
2022-08-05 15:41 ` [PATCH v9 01/27] kallsyms: use `sizeof` instead of hardcoded size Miguel Ojeda
2022-08-05 16:48   ` Geert Stappers
2022-08-05 18:46     ` Miguel Ojeda
2022-08-05 22:40   ` Konstantin Shelekhin
2022-08-17 19:36     ` Kees Cook
2022-08-18  9:03       ` Konstantin Shelekhin
2022-08-18 16:03         ` Kees Cook
2022-09-27 12:48           ` Miguel Ojeda
2022-08-05 15:41 ` [PATCH v9 02/27] kallsyms: avoid hardcoding buffer size Miguel Ojeda
2022-08-17 19:37   ` Kees Cook
2022-08-18 16:50     ` Geert Stappers
2022-08-05 15:41 ` [PATCH v9 03/27] kallsyms: add static relationship between `KSYM_NAME_LEN{,_BUFFER}` Miguel Ojeda
2022-08-17 19:39   ` Kees Cook
2022-08-17 19:50     ` Boqun Feng
2022-08-17 20:31       ` Kees Cook
2022-08-17 20:45         ` Miguel Ojeda
2022-08-05 15:41 ` [PATCH v9 04/27] kallsyms: support "big" kernel symbols Miguel Ojeda
2022-08-05 15:41 ` [PATCH v9 05/27] kallsyms: increase maximum kernel symbol length to 512 Miguel Ojeda
2022-08-05 15:41 ` [PATCH v9 06/27] rust: add C helpers Miguel Ojeda
2022-08-17 19:44   ` Kees Cook
2022-08-17 20:22     ` Miguel Ojeda
2022-08-17 20:34       ` Kees Cook
2022-08-17 21:44         ` Miguel Ojeda
2022-08-17 23:56           ` Kees Cook
2022-08-18 16:03             ` Miguel Ojeda
2022-08-18 16:08               ` Kees Cook
2022-08-18 17:01                 ` Miguel Ojeda
2022-08-05 15:41 ` [PATCH v9 07/27] rust: import upstream `alloc` crate Miguel Ojeda
2022-08-17 20:07   ` Kees Cook
2022-08-17 21:00     ` Miguel Ojeda
2022-08-05 15:41 ` [PATCH v9 08/27] rust: adapt `alloc` crate to the kernel Miguel Ojeda
2022-08-05 15:41 ` [PATCH v9 09/27] rust: add `compiler_builtins` crate Miguel Ojeda
2022-08-17 20:08   ` Kees Cook
2022-08-22 23:55   ` Nick Desaulniers
2022-08-24 18:38     ` Nick Desaulniers
2022-08-29 17:11       ` Gary Guo
2022-08-05 15:41 ` [PATCH v9 10/27] rust: add `macros` crate Miguel Ojeda
2022-08-05 15:41 ` [PATCH v9 11/27] rust: add `bindings` crate Miguel Ojeda
2022-08-05 15:41 ` [PATCH v9 12/27] rust: add `kernel` crate Miguel Ojeda
2022-08-06 10:24   ` Konstantin Shelekhin
2022-08-06 11:22     ` Miguel Ojeda
2022-08-06 12:15       ` Konstantin Shelekhin
2022-08-06 14:57       ` Matthew Wilcox
2022-09-19 14:07         ` Wedson Almeida Filho
2022-09-19 16:09           ` Linus Torvalds
2022-09-19 17:20             ` Linus Torvalds
2022-09-19 18:05               ` Wedson Almeida Filho
2022-09-19 20:42                 ` Linus Torvalds
2022-09-19 22:35                   ` Wedson Almeida Filho
2022-09-19 23:39                     ` Linus Torvalds
2022-09-19 23:50                       ` Alex Gaynor
2022-09-19 23:58                         ` Linus Torvalds
2022-09-20  0:15                           ` Linus Torvalds [this message]
2022-09-20 15:55                             ` Eric W. Biederman
2022-09-20 22:39                               ` Gary Guo
2022-09-21  6:42                                 ` comex
2022-09-21 14:19                                   ` Boqun Feng
2022-10-03  2:03                                     ` comex
2022-09-20  0:40                           ` Boqun Feng
2022-10-03  4:17                             ` Kyle Strand
2022-09-20  0:41                       ` Wedson Almeida Filho
2022-09-21 11:23       ` Konstantin Shelekhin
2022-09-21 11:46         ` Greg KH
2022-08-05 15:41 ` [PATCH v9 13/27] rust: export generated symbols Miguel Ojeda
2022-08-17 20:11   ` Kees Cook
2022-08-05 15:41 ` [PATCH v9 14/27] vsprintf: add new `%pA` format specifier Miguel Ojeda
2022-08-05 15:42 ` [PATCH v9 15/27] scripts: checkpatch: diagnose uses of `%pA` in the C side as errors Miguel Ojeda
2022-08-05 15:42 ` [PATCH v9 16/27] scripts: checkpatch: enable language-independent checks for Rust Miguel Ojeda
2022-08-17 20:12   ` Kees Cook
2022-08-05 15:42 ` [PATCH v9 17/27] scripts: decode_stacktrace: demangle Rust symbols Miguel Ojeda
2022-08-05 15:42 ` [PATCH v9 18/27] scripts: add `generate_rust_analyzer.py` Miguel Ojeda
2022-08-17 20:13   ` Kees Cook
2022-08-05 15:42 ` [PATCH v9 19/27] scripts: add `generate_rust_target.rs` Miguel Ojeda
2022-08-17 20:14   ` Kees Cook
2022-08-05 15:42 ` [PATCH v9 20/27] scripts: add `rust_is_available.sh` Miguel Ojeda
2022-08-17 20:18   ` Kees Cook
2022-08-17 20:40     ` Miguel Ojeda
2022-08-22 20:09   ` Nick Desaulniers
2022-08-23 12:12     ` Miguel Ojeda
2022-08-23 12:16       ` Miguel Ojeda
2022-08-05 15:42 ` [PATCH v9 21/27] scripts: add `is_rust_module.sh` Miguel Ojeda
2022-08-17 20:19   ` Kees Cook
2022-08-05 15:42 ` [PATCH v9 22/27] rust: add `.rustfmt.toml` Miguel Ojeda
2022-08-17 20:19   ` Kees Cook
2022-08-05 15:42 ` [PATCH v9 23/27] Kbuild: add Rust support Miguel Ojeda
2022-08-17 20:26   ` Kees Cook
2022-08-17 20:56     ` Miguel Ojeda
2022-08-22 22:35   ` Nick Desaulniers
2022-09-12 16:07   ` Masahiro Yamada
2022-09-12 16:18     ` Miguel Ojeda
2022-09-13  6:37       ` Masahiro Yamada
2022-08-05 15:42 ` [PATCH v9 24/27] docs: add Rust documentation Miguel Ojeda
2022-08-05 15:42 ` [PATCH v9 25/27] x86: enable initial Rust support Miguel Ojeda
2022-08-17 20:27   ` Kees Cook
2022-08-05 15:42 ` [PATCH v9 26/27] samples: add first Rust examples Miguel Ojeda
2022-08-06 13:14   ` Konstantin Shelekhin
2022-08-17 21:02     ` Miguel Ojeda
2022-08-18  9:04       ` Konstantin Shelekhin
2022-08-17 20:28   ` Kees Cook
2022-08-05 15:42 ` [PATCH v9 27/27] MAINTAINERS: Rust Miguel Ojeda
2022-08-17 20:28   ` Kees Cook
2022-08-17 20:43     ` Miguel Ojeda

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to='CAHk-=wj6sDFk8ZXSEKUMj-J9zfrMSSO3jhBEaveVaJSUpr=O=w@mail.gmail.com' \
    --to=torvalds@linux-foundation.org \
    --cc=alex.gaynor@gmail.com \
    --cc=andreas.hindborg@wdc.com \
    --cc=ark.email@gmail.com \
    --cc=bjorn3_gh@protonmail.com \
    --cc=bobo1239@web.de \
    --cc=bonifaido@gmail.com \
    --cc=boqun.feng@gmail.com \
    --cc=davidgow@google.com \
    --cc=dev@niklasmohrin.de \
    --cc=dsosnowski@dsosnowski.pl \
    --cc=foxhlchen@gmail.com \
    --cc=gary@garyguo.net \
    --cc=geofft@ldpreload.com \
    --cc=gregkh@linuxfoundation.org \
    --cc=jarkko@kernel.org \
    --cc=john.m.baublitz@gmail.com \
    --cc=k.shelekhin@yadro.com \
    --cc=keescook@chromium.org \
    --cc=leseulartichaut@gmail.com \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=me@kloenk.de \
    --cc=miguel.ojeda.sandonis@gmail.com \
    --cc=milan@mdaverde.com \
    --cc=mjmouse9999@gmail.com \
    --cc=ojeda@kernel.org \
    --cc=patches@lists.linux.dev \
    --cc=rust-for-linux@vger.kernel.org \
    --cc=thesven73@gmail.com \
    --cc=viktor@v-gar.de \
    --cc=wedsonaf@gmail.com \
    --cc=willy@infradead.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).