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From: Linus Torvalds <torvalds@linux-foundation.org>
To: Josh Triplett <josh@joshtriplett.org>
Cc: Christian Brauner <christian.brauner@ubuntu.com>,
	Nick Desaulniers <ndesaulniers@google.com>,
	alex.gaynor@gmail.com, Greg KH <gregkh@linuxfoundation.org>,
	geofft@ldpreload.com, jbaublitz@redhat.com,
	Masahiro Yamada <masahiroy@kernel.org>,
	Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	LKML <linux-kernel@vger.kernel.org>,
	clang-built-linux <clang-built-linux@googlegroups.com>,
	Kees Cook <keescook@chromium.org>
Subject: Re: Linux kernel in-tree Rust support
Date: Fri, 10 Jul 2020 16:54:11 -0700
Message-ID: <CAHk-=wipXqemHbVnK1kQsFzGOOZ8FUXn3PKrZb5WC=KkgAjRRw@mail.gmail.com> (raw)
In-Reply-To: <20200710225934.GA16881@localhost>

On Fri, Jul 10, 2020 at 3:59 PM Josh Triplett <josh@joshtriplett.org> wrote:
>
> As I recall, Greg's biggest condition for initial introduction of this
> was to do the same kind of "turn this Kconfig option on and turn an
> option under it off" trick that LTO uses, so that neither "make
> allnoconfig" nor "make allyesconfig" would require Rust until we've had
> plenty of time to experiment with it.

No, please make it a "is rust available" automatic config option. The
exact same way we already do the compiler versions and check for
various availability of compiler flags at config time.

See init/Kconfig for things like

  config LD_IS_LLD
          def_bool $(success,$(LD) -v | head -n 1 | grep -q LLD)

and the rust support should be similar. Something like

  config RUST_IS_AVAILABLE
          def_bool $(success,$(RUST) ..sometest..)

because I _don't_ want us to be in the situation where any new rust
support isn't even build-tested by default.

Quite the reverse. I'd want the first rust driver (or whatever) to be
introduced in such a simple format that failures will be obvious and
simple.

The _worst_ situation to be in is that s (small) group of people start
testing their very special situation, and do bad and crazy things
because "nobody else cares, it's hidden".

No, thank you.

             Linus

  reply index

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-09 18:41 Nick Desaulniers
2020-07-09 20:52 ` Miguel Ojeda
2020-07-10  5:36 ` Josh Triplett
2020-07-10  6:28 ` Greg KH
2020-07-10 12:50   ` Christian Brauner
2020-07-10 16:10     ` Kees Cook
     [not found]       ` <CAFRnB2WNo45J8h3-ncopLKENvcO0rf7J3xsy_eRKwFSpDD-5sQ@mail.gmail.com>
2020-07-10 23:05         ` Kees Cook
2020-07-10 22:59     ` Josh Triplett
2020-07-10 23:54       ` Linus Torvalds [this message]
2020-07-11 21:03         ` Josh Triplett
2020-07-28 20:40           ` Pavel Machek
2020-07-29  6:34             ` Josh Triplett
2020-07-11 17:13 ` Geoffrey Thomas
2020-07-12 12:31 ` Adrian Bunk
2020-07-12 19:39   ` Josh Triplett
2020-07-12 20:33     ` Linus Torvalds
2020-07-12 20:45     ` Adrian Bunk
2020-07-14  8:27       ` David Laight
2020-07-16 13:06     ` Arnd Bergmann
2020-07-16 23:12       ` Josh Triplett
2020-07-19 18:19       ` Adrian Bunk
2020-07-20 14:46         ` David Laight
2020-08-23 21:02     ` Adrian Bunk
2020-08-23 21:54       ` Geoffrey Thomas
2020-07-13 18:11 ` Eric W. Biederman
2020-07-13 21:33   ` Josh Triplett

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