From: Thomas Gleixner <tglx@kernel.org>
To: Florian Weimer <fweimer@redhat.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
"Mathieu Desnoyers" <mathieu.desnoyers@efficios.com>,
"André Almeida" <andrealmeid@igalia.com>,
"Sebastian Andrzej Siewior" <bigeasy@linutronix.de>,
"Carlos O'Donell" <carlos@redhat.com>,
"Peter Zijlstra" <peterz@infradead.org>,
"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 8/8] x86/vdso: Implement __vdso_futex_robust_try_unlock()
Date: Wed, 18 Mar 2026 23:08:26 +0100 [thread overview]
Message-ID: <87fr5wn63p.ffs@tglx> (raw)
In-Reply-To: <87zf46m6j1.ffs@tglx>
On Tue, Mar 17 2026 at 23:32, Thomas Gleixner wrote:
> On Tue, Mar 17 2026 at 11:37, Florian Weimer wrote:
> Something like the below compiled but untested delta diff which includes
> also the other unrelated feedback fixups?
The more I look into it, the more I regret that we allowed mixed mode in
the first place. Which way I turn it around the code becomes more
horrible than it really should be.
If I understand it correctly then the only real world use case is the
x86 emulator for ARM64. That made me think about possible options to
keep the insanity restricted.
1) Delegate the problem to the ARM64 people :)
2) Make that mixed size mode depend on a config option
3) Require that such a use case issues a prctl to switch into that
special case mode.
or a combination of those.
Andre?
next prev parent reply other threads:[~2026-03-18 22:08 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
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 [this message]
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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