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From: Linus Torvalds <torvalds@linux-foundation.org>
To: Florian Weimer <fweimer@redhat.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	Segher Boessenkool <segher@kernel.crashing.org>,
	Will Deacon <will@kernel.org>, paulmck <paulmck@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Alan Stern <stern@rowland.harvard.edu>,
	Andrea Parri <parri.andrea@gmail.com>,
	Boqun Feng <boqun.feng@gmail.com>,
	Nicholas Piggin <npiggin@gmail.com>,
	David Howells <dhowells@redhat.com>,
	j alglave <j.alglave@ucl.ac.uk>,
	luc maranget <luc.maranget@inria.fr>, akiyks <akiyks@gmail.com>,
	linux-toolchains <linux-toolchains@vger.kernel.org>,
	linux-arch <linux-arch@vger.kernel.org>
Subject: Re: [RFC PATCH] LKMM: Add ctrl_dep() macro for control dependency
Date: Fri, 1 Oct 2021 09:35:47 -0700	[thread overview]
Message-ID: <CAHk-=wgexLqNnngLPts=wXrRcoP_XHO03iPJbsAg8HYuJbbAvw@mail.gmail.com> (raw)
In-Reply-To: <871r54ww2k.fsf@oldenburg.str.redhat.com>

On Fri, Oct 1, 2021 at 9:26 AM Florian Weimer <fweimer@redhat.com> wrote:
>
> Will any conditional branch do, or is it necessary that it depends in
> some way on the data read?

The condition needs to be dependent on the read.

(Easy way to see it: if the read isn't related to the conditional or
write data/address, the read could just be delayed to after the
condition and the store had been done).

               Linus

  reply	other threads:[~2021-10-01 16:36 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-28 21:15 [RFC PATCH] LKMM: Add ctrl_dep() macro for control dependency Mathieu Desnoyers
2021-09-29 12:06 ` Marco Elver
2021-10-01 15:45   ` Mathieu Desnoyers
2021-10-01 16:20     ` Linus Torvalds
2021-10-01 17:28       ` Mathieu Desnoyers
2021-10-01 18:18         ` Linus Torvalds
2021-09-29 12:28 ` Florian Weimer
2021-09-29 17:41   ` Segher Boessenkool
2021-09-29 19:46     ` Florian Weimer
2021-10-01 16:13     ` Mathieu Desnoyers
2021-10-01 16:26       ` Florian Weimer
2021-10-01 16:35         ` Linus Torvalds [this message]
2021-10-10 14:02           ` Florian Weimer
2021-10-14  0:01             ` Paul E. McKenney
2021-10-14  2:14               ` Alan Stern
2021-10-14 16:14                 ` Paul E. McKenney
2021-10-14 15:58               ` Florian Weimer
2021-10-14 16:23                 ` Paul E. McKenney
2021-10-14 18:19                   ` Florian Weimer
2021-10-14 21:09                     ` Paul E. McKenney
2021-10-14 22:36                       ` Linus Torvalds
2021-09-30 13:28   ` Mathieu Desnoyers
2021-09-29 14:47 ` Linus Torvalds
2021-09-29 14:54   ` Linus Torvalds
2021-09-29 19:50     ` Mathieu Desnoyers
2021-09-29 20:13       ` Mathieu Desnoyers
2021-09-29 19:27   ` Mathieu Desnoyers
2021-09-29 22:14     ` Linus Torvalds
2021-09-29 21:47 ` Segher Boessenkool
2021-09-29 23:57   ` Paul E. McKenney
2021-10-01 15:28     ` Mathieu Desnoyers
2021-10-01 22:53       ` Paul E. McKenney
2021-10-01 19:10     ` Segher Boessenkool
2021-10-01 22:50       ` Paul E. McKenney
2021-10-02 14:29       ` Alan Stern

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