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From: Thomas Gleixner <tglx@kernel.org>
To: =?utf-8?Q?Andr=C3=A9?= Almeida <andrealmeid@igalia.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>, Sebastian Andrzej
 Siewior <bigeasy@linutronix.de>, Carlos O'Donell <carlos@redhat.com>,
 Peter Zijlstra <peterz@infradead.org>, 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>, LKML <linux-kernel@vger.kernel.org>, Davidlohr Bueso
 <dave@stgolabs.net>, Arnd Bergmann <arnd@arndb.de>, "Liam R . Howlett"
 <Liam.Howlett@oracle.com>, Uros Bizjak <ubizjak@gmail.com>, Thomas
 =?utf-8?Q?Wei=C3=9Fschuh?= <linux@weissschuh.net>
Subject: Re: [patch V4 10/14] futex: Provide infrastructure to plug the non
 contended robust futex unlock race
In-Reply-To: <9d6149b3-d153-4aba-ac66-38ce6b8d8e16@igalia.com>
References: <20260402151131.876492985@kernel.org>
 <20260402151940.282021578@kernel.org>
 <9d6149b3-d153-4aba-ac66-38ce6b8d8e16@igalia.com>
Date: Fri, 29 May 2026 23:14:32 +0200
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On Wed, May 27 2026 at 22:08, Andr=C3=A9 Almeida wrote:
> Em 02/04/2026 12:21, Thomas Gleixner escreveu:
>> +	/*
>> +	 * Avoid dereferencing current->mm if not returning from interrupt.
>> +	 * current->rseq.event is going to be used subsequently, so bringing t=
he
>> +	 * cache line in is not a big deal.
>> +	 */
>> +	if (!current->rseq.event.user_irq)
>> +		return;
>> +
>
> For some reason, this if is always true for aarch64. I had to remove it=20
> in order to make the test work. Any idea why?

No. That looks like a bug on the arm64 side.