From: "Russell King (Oracle)" <linux@armlinux.org.uk>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Xie Yuanbin <xieyuanbin1@huawei.com>,
arnd@arndb.de, linux-arm-kernel@lists.infradead.org,
linux-rt-devel@lists.linux.dev, tglx@linutronix.de
Subject: Re: [PATCH 4/5] ARM: Disable jump-label on PREEMPT_RT.
Date: Thu, 30 Oct 2025 10:38:10 +0000 [thread overview]
Message-ID: <aQNAEtIoU9sEx3LF@shell.armlinux.org.uk> (raw)
In-Reply-To: <20251030075558.sUBj8_6U@linutronix.de>
On Thu, Oct 30, 2025 at 08:55:58AM +0100, Sebastian Andrzej Siewior wrote:
> Arm64 and X86 replaced the stop_machine() logic with something else that
> does not affect latency in that magnitude. If Arm could something
> similar then fine but until then I don't see a way around it.
"If Arm could". For 32-bit, Arm Ltd isn't going to do anything, it's
old as far as they're concerned. It's up to those participating in the
kernel community to maintain and look after the code.
Thus, if there is a desire for something other than stop_machine() then
it is up to those who care about the issue to do something about it,
rather than expecting someone else to do something for them.
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!
next prev parent reply other threads:[~2025-10-30 10:38 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-29 15:59 [PATCH 0/5] ARM: Remaining PREEMPT_RT bits Sebastian Andrzej Siewior
2025-10-29 15:59 ` [PATCH 1/5] ARM: mm: fault: Move harden_branch_predictor() before interrupts are enabled Sebastian Andrzej Siewior
2025-10-29 15:59 ` [PATCH 2/5] ARM: mm: fault: Enable interrupts before invoking __do_user_fault() Sebastian Andrzej Siewior
2025-10-29 15:59 ` [PATCH 3/5] ARM: Disable FAST_GUP on PREEMPT_RT if HIGHPTE is also enabled Sebastian Andrzej Siewior
2025-10-30 15:15 ` Arnd Bergmann
2025-10-30 15:24 ` Sebastian Andrzej Siewior
2025-10-29 15:59 ` [PATCH 4/5] ARM: Disable jump-label on PREEMPT_RT Sebastian Andrzej Siewior
2025-10-30 2:39 ` Xie Yuanbin
2025-10-30 7:23 ` Sebastian Andrzej Siewior
2025-10-30 7:45 ` Xie Yuanbin
2025-10-30 7:55 ` Sebastian Andrzej Siewior
2025-10-30 9:46 ` Steven Rostedt
2025-10-30 9:56 ` Sebastian Andrzej Siewior
2025-10-30 10:05 ` Steven Rostedt
2025-10-30 10:38 ` Russell King (Oracle) [this message]
2025-10-30 11:10 ` Sebastian Andrzej Siewior
2025-10-30 15:24 ` Arnd Bergmann
2025-10-30 15:28 ` Sebastian Andrzej Siewior
2025-10-29 15:59 ` [PATCH 5/5] ARM: Allow to enable RT Sebastian Andrzej Siewior
2025-10-30 15:18 ` Arnd Bergmann
2025-10-30 15:22 ` Sebastian Andrzej Siewior
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