From: Ventura Jack <venturajack85@gmail.com>
To: Martin Uecker <uecker@tugraz.at>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Ralf Jung <post@ralfj.de>,
"Paul E. McKenney" <paulmck@kernel.org>,
Alice Ryhl <aliceryhl@google.com>,
Kent Overstreet <kent.overstreet@linux.dev>,
Gary Guo <gary@garyguo.net>,
airlied@gmail.com, boqun.feng@gmail.com,
david.laight.linux@gmail.com, ej@inai.de,
gregkh@linuxfoundation.org, hch@infradead.org, hpa@zytor.com,
ksummit@lists.linux.dev, linux-kernel@vger.kernel.org,
miguel.ojeda.sandonis@gmail.com, rust-for-linux@vger.kernel.org
Subject: Re: C aggregate passing (Rust kernel policy)
Date: Thu, 27 Feb 2025 07:21:24 -0700 [thread overview]
Message-ID: <CAFJgqgSjRwOUkcC5v6wGcfQ-53oWyWW+wBg3PZ-w7vRweHekpw@mail.gmail.com> (raw)
In-Reply-To: <ed7ef66dbde453035117c3f2acb1daefa5bd19eb.camel@tugraz.at>
On Wed, Feb 26, 2025 at 1:00 PM Martin Uecker <uecker@tugraz.at> wrote:
>
> I think C++ messed up a lot (including time-travel UB, uninitialized
> variables, aliasing ules and much more), but I do not see
> the problem here.
C++26 actually changes the rules of reading uninitialized
variables from being undefined behavior to being
"erroneous behavior", for the purpose of decreasing instances
that can cause UB. Though programmers can still opt-into
the old behavior with UB, on a case by case basis, for the
sake of performance.
Best, VJ.
next prev parent reply other threads:[~2025-02-27 14:21 UTC|newest]
Thread overview: 196+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-22 10:06 Ventura Jack
2025-02-22 14:15 ` Gary Guo
2025-02-22 15:03 ` Ventura Jack
2025-02-22 18:54 ` Kent Overstreet
2025-02-22 19:18 ` Linus Torvalds
2025-02-22 20:00 ` Kent Overstreet
2025-02-22 20:54 ` H. Peter Anvin
2025-02-22 21:22 ` Kent Overstreet
2025-02-22 21:46 ` Linus Torvalds
2025-02-22 22:34 ` Kent Overstreet
2025-02-22 23:56 ` Jan Engelhardt
2025-02-22 22:12 ` David Laight
2025-02-22 22:46 ` Kent Overstreet
2025-02-22 23:50 ` H. Peter Anvin
2025-02-23 0:06 ` Kent Overstreet
2025-02-22 21:22 ` Linus Torvalds
2025-02-23 15:30 ` Ventura Jack
2025-02-23 16:28 ` David Laight
2025-02-24 0:27 ` Gary Guo
2025-02-24 9:57 ` Ventura Jack
2025-02-24 10:31 ` Benno Lossin
2025-02-24 12:21 ` Ventura Jack
2025-02-24 12:47 ` Benno Lossin
2025-02-24 16:57 ` Ventura Jack
2025-02-24 22:03 ` Benno Lossin
2025-02-24 23:04 ` Ventura Jack
2025-02-25 22:38 ` Benno Lossin
2025-02-25 22:47 ` Miguel Ojeda
2025-02-25 23:03 ` Benno Lossin
2025-02-24 12:58 ` Theodore Ts'o
2025-02-24 14:47 ` Miguel Ojeda
2025-02-24 14:54 ` Miguel Ojeda
2025-02-24 16:42 ` Philip Herron
2025-02-25 15:55 ` Ventura Jack
2025-02-25 17:30 ` Arthur Cohen
2025-02-26 11:38 ` Ralf Jung
2025-02-24 15:43 ` Miguel Ojeda
2025-02-24 17:24 ` Kent Overstreet
2025-02-25 16:12 ` Alice Ryhl
2025-02-25 17:21 ` Ventura Jack
2025-02-25 17:36 ` Alice Ryhl
2025-02-25 18:16 ` H. Peter Anvin
2025-02-25 20:21 ` Kent Overstreet
2025-02-25 20:37 ` H. Peter Anvin
2025-02-26 13:03 ` Ventura Jack
2025-02-26 13:53 ` Miguel Ojeda
2025-02-26 14:07 ` Ralf Jung
2025-02-26 14:26 ` James Bottomley
2025-02-26 14:37 ` Ralf Jung
2025-02-26 14:39 ` Greg KH
2025-02-26 14:45 ` James Bottomley
2025-02-26 16:00 ` Steven Rostedt
2025-02-26 16:42 ` James Bottomley
2025-02-26 16:47 ` Kent Overstreet
2025-02-26 16:57 ` Steven Rostedt
2025-02-26 17:41 ` Kent Overstreet
2025-02-26 17:47 ` Steven Rostedt
2025-02-26 22:07 ` Josh Poimboeuf
2025-03-02 12:19 ` David Laight
2025-02-26 17:11 ` Miguel Ojeda
2025-02-26 17:42 ` Kent Overstreet
2025-02-26 12:36 ` Ventura Jack
2025-02-26 13:52 ` Miguel Ojeda
2025-02-26 15:21 ` Ventura Jack
2025-02-26 16:06 ` Ralf Jung
2025-02-26 17:49 ` Miguel Ojeda
2025-02-26 18:36 ` Ventura Jack
2025-02-26 14:14 ` Ralf Jung
2025-02-26 15:40 ` Ventura Jack
2025-02-26 16:10 ` Ralf Jung
2025-02-26 16:50 ` Ventura Jack
2025-02-26 21:39 ` Ralf Jung
2025-02-27 15:11 ` Ventura Jack
2025-02-27 15:32 ` Ralf Jung
2025-02-25 18:54 ` Linus Torvalds
2025-02-25 19:47 ` Kent Overstreet
2025-02-25 20:25 ` Linus Torvalds
2025-02-25 20:55 ` Kent Overstreet
2025-02-25 21:24 ` Linus Torvalds
2025-02-25 23:34 ` Kent Overstreet
2025-02-26 11:57 ` Gary Guo
2025-02-27 14:43 ` Ventura Jack
2025-02-26 14:26 ` Ventura Jack
2025-02-25 22:45 ` Miguel Ojeda
2025-02-26 0:05 ` Miguel Ojeda
2025-02-25 22:42 ` Miguel Ojeda
2025-02-26 14:01 ` Ralf Jung
2025-02-26 13:54 ` Ralf Jung
2025-02-26 17:59 ` Linus Torvalds
2025-02-26 19:01 ` Paul E. McKenney
2025-02-26 20:00 ` Martin Uecker
2025-02-26 21:14 ` Linus Torvalds
2025-02-26 21:21 ` Linus Torvalds
2025-02-26 22:54 ` David Laight
2025-02-27 0:35 ` Paul E. McKenney
2025-02-26 21:26 ` Steven Rostedt
2025-02-26 21:37 ` Steven Rostedt
2025-02-26 21:42 ` Linus Torvalds
2025-02-26 21:56 ` Steven Rostedt
2025-02-26 22:13 ` Steven Rostedt
2025-02-26 22:22 ` Linus Torvalds
2025-02-26 22:35 ` Steven Rostedt
2025-02-26 23:18 ` Linus Torvalds
2025-02-26 23:28 ` Steven Rostedt
2025-02-27 0:04 ` Linus Torvalds
2025-02-27 20:47 ` David Laight
2025-02-27 21:33 ` Steven Rostedt
2025-02-28 21:29 ` Paul E. McKenney
2025-02-27 21:41 ` Paul E. McKenney
2025-02-27 22:20 ` David Laight
2025-02-27 22:40 ` Paul E. McKenney
2025-02-28 7:44 ` Ralf Jung
2025-02-28 15:41 ` Kent Overstreet
2025-02-28 15:46 ` Boqun Feng
2025-02-28 16:04 ` Kent Overstreet
2025-02-28 16:13 ` Boqun Feng
2025-02-28 16:21 ` Kent Overstreet
2025-02-28 16:40 ` Boqun Feng
2025-03-04 18:12 ` Ralf Jung
2025-02-26 22:27 ` Kent Overstreet
2025-02-26 23:16 ` Linus Torvalds
2025-02-27 0:17 ` Kent Overstreet
2025-02-27 0:26 ` comex
2025-02-27 18:33 ` Ralf Jung
2025-02-27 19:15 ` Linus Torvalds
2025-02-27 19:55 ` Kent Overstreet
2025-02-27 20:28 ` Linus Torvalds
2025-02-28 7:53 ` Ralf Jung
2025-03-06 19:16 ` Ventura Jack
2025-02-27 4:18 ` Martin Uecker
2025-02-27 5:52 ` Linus Torvalds
2025-02-27 6:56 ` Martin Uecker
2025-02-27 14:29 ` Steven Rostedt
2025-02-27 17:35 ` Paul E. McKenney
2025-02-27 18:13 ` Kent Overstreet
2025-02-27 19:10 ` Paul E. McKenney
2025-02-27 18:00 ` Ventura Jack
2025-02-27 18:44 ` Ralf Jung
2025-02-27 14:21 ` Ventura Jack [this message]
2025-02-27 15:27 ` H. Peter Anvin
2025-02-28 8:08 ` Ralf Jung
2025-02-28 8:32 ` Martin Uecker
2025-02-26 20:25 ` Kent Overstreet
2025-02-26 20:34 ` Andy Lutomirski
2025-02-26 22:45 ` David Laight
2025-02-22 19:41 ` Miguel Ojeda
2025-02-22 20:49 ` Kent Overstreet
2025-02-26 11:34 ` Ralf Jung
2025-02-26 14:57 ` Ventura Jack
2025-02-26 16:32 ` Ralf Jung
2025-02-26 18:09 ` Ventura Jack
2025-02-26 22:28 ` Ralf Jung
2025-02-26 23:08 ` David Laight
2025-02-27 13:55 ` Ralf Jung
2025-02-27 17:33 ` Ventura Jack
2025-02-27 17:58 ` Ralf Jung
2025-02-27 19:06 ` Ventura Jack
2025-02-27 19:45 ` Ralf Jung
2025-02-27 20:22 ` Kent Overstreet
2025-02-27 22:18 ` David Laight
2025-02-27 23:18 ` Kent Overstreet
2025-02-28 7:38 ` Ralf Jung
2025-02-28 20:48 ` Ventura Jack
2025-02-28 20:41 ` Ventura Jack
2025-02-28 22:13 ` Geoffrey Thomas
2025-03-01 14:19 ` Ventura Jack
2025-03-04 18:24 ` Ralf Jung
2025-03-06 18:49 ` Ventura Jack
2025-02-27 17:58 ` Miguel Ojeda
2025-02-27 19:25 ` Ventura Jack
2025-02-26 19:07 ` Martin Uecker
2025-02-26 19:23 ` Ralf Jung
2025-02-26 20:22 ` Martin Uecker
[not found] <CAFJgqgRZ1w0ONj2wbcczx2=boXYHoLOd=-ke7tHGBAcifSfPUw@mail.gmail.com>
2025-02-25 15:42 ` H. Peter Anvin
2025-02-25 16:45 ` Ventura Jack
[not found] <CANiq72m-R0tOakf=j7BZ78jDHdy=9-fvZbAT8j91Je2Bxy0sFg@mail.gmail.com>
2025-02-18 16:08 ` Rust kernel policy Christoph Hellwig
2025-02-18 18:46 ` Miguel Ojeda
2025-02-18 21:49 ` H. Peter Anvin
2025-02-18 22:54 ` Miguel Ojeda
2025-02-19 0:58 ` H. Peter Anvin
2025-02-19 3:04 ` Boqun Feng
2025-02-19 5:39 ` Greg KH
2025-02-20 12:28 ` Jan Engelhardt
2025-02-20 12:37 ` Greg KH
2025-02-20 13:23 ` H. Peter Anvin
2025-02-20 15:17 ` C aggregate passing (Rust kernel policy) Jan Engelhardt
2025-02-20 16:46 ` Linus Torvalds
2025-02-20 20:34 ` H. Peter Anvin
2025-02-21 8:31 ` HUANG Zhaobin
2025-02-21 18:34 ` David Laight
2025-02-21 19:12 ` Linus Torvalds
2025-02-21 20:07 ` comex
2025-02-21 21:45 ` David Laight
2025-02-22 6:32 ` Willy Tarreau
2025-02-22 6:37 ` Willy Tarreau
2025-02-22 8:41 ` David Laight
2025-02-22 9:11 ` Willy Tarreau
2025-02-21 20:06 ` Jan Engelhardt
2025-02-21 20:23 ` Laurent Pinchart
2025-02-21 20:24 ` Laurent Pinchart
2025-02-21 22:02 ` David Laight
2025-02-21 22:13 ` Bart Van Assche
2025-02-22 5:56 ` comex
2025-02-21 20:26 ` Linus Torvalds
2025-02-21 22:19 ` henrychurchill
2025-02-21 22:52 ` henrychurchill
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