From: Thomas Gleixner <tglx@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: "André Almeida" <andrealmeid@igalia.com>,
LKML <linux-kernel@vger.kernel.org>,
"Mathieu Desnoyers" <mathieu.desnoyers@efficios.com>,
"Sebastian Andrzej Siewior" <bigeasy@linutronix.de>,
"Carlos O'Donell" <carlos@redhat.com>,
"Florian Weimer" <fweimer@redhat.com>,
"Rich Felker" <dalias@aerifal.cx>,
"Torvald Riegel" <triegel@redhat.com>,
"Darren Hart" <dvhart@infradead.org>,
"Ingo Molnar" <mingo@kernel.org>,
"Davidlohr Bueso" <dave@stgolabs.net>,
"Arnd Bergmann" <arnd@arndb.de>,
"Liam R . Howlett" <Liam.Howlett@oracle.com>
Subject: Re: [patch 4/8] futex: Add support for unlocking robust futexes
Date: Wed, 18 Mar 2026 17:03:08 +0100 [thread overview]
Message-ID: <87ldfpm8g3.ffs@tglx> (raw)
In-Reply-To: <20260318144758.GB3739106@noisy.programming.kicks-ass.net>
On Wed, Mar 18 2026 at 15:47, Peter Zijlstra wrote:
> On Wed, Mar 18, 2026 at 09:02:01AM +0100, Peter Zijlstra wrote:
>> So I think we once tried to determine if syscall could be considered to
>> imply memory ordering, and I think the take-away at the time was that we
>> could not assume so.
>>
>> But its been a long time, maybe I misremember.
>
> Ah, it was for the sys_membarrier() thing. And yes, a syscall itself
> does not imply memory ordering for all architectures. And since this
> very much needs release semantics, it is best to be explicit about that.
What a mess...
next prev parent reply other threads:[~2026-03-18 16:03 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-16 17:12 [patch 0/8] futex: Address the robust futex unlock race for real Thomas Gleixner
2026-03-16 17:12 ` [patch 1/8] futex: Move futex task related data into a struct Thomas Gleixner
2026-03-16 17:55 ` Mathieu Desnoyers
2026-03-17 2:24 ` André Almeida
2026-03-17 9:52 ` Thomas Gleixner
2026-03-16 17:13 ` [patch 2/8] futex: Move futex related mm_struct " Thomas Gleixner
2026-03-16 18:00 ` Mathieu Desnoyers
2026-03-16 17:13 ` [patch 3/8] futex: Provide UABI defines for robust list entry modifiers Thomas Gleixner
2026-03-16 18:02 ` Mathieu Desnoyers
2026-03-17 2:38 ` André Almeida
2026-03-17 9:53 ` Thomas Gleixner
2026-03-16 17:13 ` [patch 4/8] futex: Add support for unlocking robust futexes Thomas Gleixner
2026-03-16 18:24 ` Mathieu Desnoyers
2026-03-17 16:17 ` André Almeida
2026-03-17 20:46 ` Peter Zijlstra
2026-03-17 22:40 ` Thomas Gleixner
2026-03-18 8:02 ` Peter Zijlstra
2026-03-18 8:06 ` Florian Weimer
2026-03-18 14:47 ` Peter Zijlstra
2026-03-18 16:03 ` Thomas Gleixner [this message]
2026-03-16 17:13 ` [patch 5/8] futex: Add robust futex unlock IP range Thomas Gleixner
2026-03-16 18:36 ` Mathieu Desnoyers
2026-03-17 19:19 ` André Almeida
2026-03-16 17:13 ` [patch 6/8] futex: Provide infrastructure to plug the non contended robust futex unlock race Thomas Gleixner
2026-03-16 18:35 ` Mathieu Desnoyers
2026-03-16 20:29 ` Thomas Gleixner
2026-03-16 20:52 ` Mathieu Desnoyers
2026-03-16 17:13 ` [patch 7/8] x86/vdso: Prepare for robust futex unlock support Thomas Gleixner
2026-03-16 17:13 ` [patch 8/8] x86/vdso: Implement __vdso_futex_robust_try_unlock() Thomas Gleixner
2026-03-16 19:19 ` Mathieu Desnoyers
2026-03-16 21:02 ` Thomas Gleixner
2026-03-16 22:35 ` Mathieu Desnoyers
2026-03-16 21:14 ` Thomas Gleixner
2026-03-16 21:29 ` Thomas Gleixner
2026-03-17 7:25 ` Thomas Weißschuh
2026-03-17 9:51 ` Thomas Gleixner
2026-03-17 11:17 ` Thomas Weißschuh
2026-03-18 16:17 ` Thomas Gleixner
2026-03-19 7:41 ` Thomas Weißschuh
2026-03-19 8:53 ` Florian Weimer
2026-03-19 9:04 ` Thomas Weißschuh
2026-03-19 9:08 ` Peter Zijlstra
2026-03-19 23:31 ` Thomas Gleixner
2026-03-19 10:36 ` Sebastian Andrzej Siewior
2026-03-19 10:49 ` Thomas Weißschuh
2026-03-19 10:55 ` Sebastian Andrzej Siewior
2026-03-17 8:28 ` Florian Weimer
2026-03-17 9:36 ` Thomas Gleixner
2026-03-17 10:37 ` Florian Weimer
2026-03-17 22:32 ` Thomas Gleixner
2026-03-18 22:08 ` Thomas Gleixner
2026-03-18 22:10 ` Peter Zijlstra
2026-03-19 2:05 ` André Almeida
2026-03-19 7:10 ` Thomas Gleixner
2026-03-17 15:33 ` Uros Bizjak
2026-03-18 8:21 ` Thomas Gleixner
2026-03-18 8:32 ` Uros Bizjak
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