From: Thomas Gleixner <tglx@kernel.org>
To: Mark Rutland <mark.rutland@arm.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
"Mathieu Desnoyers" <mathieu.desnoyers@efficios.com>,
"Andrè Almeida" <andrealmeid@igalia.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>,
"Davidlohr Bueso" <dave@stgolabs.net>,
"Arnd Bergmann" <arnd@arndb.de>,
"Liam R . Howlett" <Liam.Howlett@oracle.com>,
"Uros Bizjak" <ubizjak@gmail.com>,
"Thomas Weißschuh" <linux@weissschuh.net>
Subject: Re: [patch V3 06/14] x86: Select ARCH_MEMORY_ORDER_TOS
Date: Mon, 30 Mar 2026 21:48:50 +0200 [thread overview]
Message-ID: <87mrzp9jz1.ffs@tglx> (raw)
In-Reply-To: <acp71dXQLRc27mUV@J2N7QTR9R3>
On Mon, Mar 30 2026 at 14:34, Mark Rutland wrote:
> On Mon, Mar 30, 2026 at 02:02:31PM +0200, Thomas Gleixner wrote:
>> The generic unsafe_atomic_store_release_user() implementation does:
>>
>> if (!IS_ENABLED(CONFIG_ARCH_MEMORY_ORDER_TOS))
>> smp_mb();
>> unsafe_put_user();
>>
>> As x86 implements Total Store Order (TOS) which means stores imply release,
>> select ARCH_MEMORY_ORDER_TOS to avoid the unnecessary smp_mb().
>>
>> Signed-off-by: Thomas Gleixner <tglx@kernel.org>
>> Reviewed-by: André Almeida <andrealmeid@igalia.com>
>> ---
>> V3: Rename to TOS - Peter
>
> As on the last patch, shouldn't that be TSO?
Duh. Yes. My dyslexia seems to get worse.
next prev parent reply other threads:[~2026-03-30 19:48 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-30 12:01 [patch V3 00/14] futex: Address the robust futex unlock race for real Thomas Gleixner
2026-03-30 12:02 ` [patch V3 01/14] futex: Move futex task related data into a struct Thomas Gleixner
2026-03-30 12:02 ` [patch V3 02/14] futex: Make futex_mm_init() void Thomas Gleixner
2026-03-30 12:02 ` [patch V3 03/14] futex: Move futex related mm_struct data into a struct Thomas Gleixner
2026-03-30 15:23 ` Alexander Kuleshov
2026-03-30 12:02 ` [patch V3 04/14] futex: Provide UABI defines for robust list entry modifiers Thomas Gleixner
2026-03-30 12:02 ` [patch V3 05/14] uaccess: Provide unsafe_atomic_store_release_user() Thomas Gleixner
2026-03-30 13:33 ` Mark Rutland
2026-03-30 12:02 ` [patch V3 06/14] x86: Select ARCH_MEMORY_ORDER_TOS Thomas Gleixner
2026-03-30 13:34 ` Mark Rutland
2026-03-30 19:48 ` Thomas Gleixner [this message]
2026-03-30 12:02 ` [patch V3 07/14] futex: Cleanup UAPI defines Thomas Gleixner
2026-03-30 12:02 ` [patch V3 08/14] futex: Add support for unlocking robust futexes Thomas Gleixner
2026-03-30 12:02 ` [patch V3 09/14] futex: Add robust futex unlock IP range Thomas Gleixner
2026-03-30 12:02 ` [patch V3 10/14] futex: Provide infrastructure to plug the non contended robust futex unlock race Thomas Gleixner
2026-03-30 12:02 ` [patch V3 11/14] x86/vdso: Prepare for robust futex unlock support Thomas Gleixner
2026-03-30 12:03 ` [patch V3 12/14] x86/vdso: Implement __vdso_futex_robust_try_unlock() Thomas Gleixner
2026-03-30 12:03 ` [patch V3 13/14] Documentation: futex: Add a note about robust list race condition Thomas Gleixner
2026-03-30 12:03 ` [patch V3 14/14] selftests: futex: Add tests for robust release operations Thomas Gleixner
2026-03-30 13:45 ` [patch V3 00/14] futex: Address the robust futex unlock race for real Mark Rutland
2026-03-30 13:51 ` Peter Zijlstra
2026-03-30 19:36 ` Thomas Gleixner
2026-03-31 14:12 ` Mark Rutland
2026-03-31 12:59 ` André Almeida
2026-03-31 13:03 ` Sebastian Andrzej Siewior
2026-03-31 14:13 ` Mark Rutland
2026-03-31 15:22 ` Thomas Gleixner
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