From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Arnd Bergmann <arnd@arndb.de>
Cc: linux-arm-kernel@lists.infradead.org,
linux-rt-devel@lists.linux.dev,
Russell King <linux@armlinux.org.uk>,
Xie Yuanbin <xieyuanbin1@huawei.com>
Subject: Re: [PATCH 3/5] ARM: Disable FAST_GUP on PREEMPT_RT if HIGHPTE is also enabled.
Date: Thu, 30 Oct 2025 16:24:25 +0100 [thread overview]
Message-ID: <20251030152425.TXa7Vocb@linutronix.de> (raw)
In-Reply-To: <324652fe-b5b8-45a6-9c57-096813e9092c@app.fastmail.com>
On 2025-10-30 16:15:42 [+0100], Arnd Bergmann wrote:
> On Wed, Oct 29, 2025, at 16:59, Sebastian Andrzej Siewior wrote:
> > --- a/arch/arm/Kconfig
> > +++ b/arch/arm/Kconfig
> > @@ -105,7 +105,7 @@ config ARM
> > select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE
> > select HAVE_EFFICIENT_UNALIGNED_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && MMU
> > select HAVE_EXIT_THREAD
> > - select HAVE_GUP_FAST if ARM_LPAE
> > + select HAVE_GUP_FAST if ARM_LPAE && !(PREEMPT_RT && HIGHPTE)
> > select HAVE_FUNCTION_ERROR_INJECTION
> > select HAVE_FUNCTION_GRAPH_TRACER
> > select HAVE_FUNCTION_GRAPH_FREGS
>
> I would still prefer the version I posted previous at
>
> https://lore.kernel.org/all/20241210160556.2341497-3-arnd@kernel.org/
>
> disabling HIGHPTE when PREEMPT_RT is enabled.
I did remember that we shifted something I just wasn't sure what it was.
I will update for v2.
> Arnd
Sebastian
next prev parent reply other threads:[~2025-10-30 15:24 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 [this message]
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)
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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