linux-kernel - Re: [PATCH 0/3] Allow to enable PREEMPT

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Message-ID: <20240912071403.KMVCGTA2@linutronix.de>
Date: Thu, 12 Sep 2024 09:14:03 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Mingcong Bai <jeffbai@...c.io>
Cc: Thomas Gleixner <tglx@...utronix.de>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>, Albert Ou <aou@...s.berkeley.edu>,
	Borislav Petkov <bp@...en8.de>,
	Catalin Marinas <catalin.marinas@....com>,
	Clark Williams <williams@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Ingo Molnar <mingo@...hat.com>,
	John Ogness <john.ogness@...utronix.de>,
	Palmer Dabbelt <palmer@...belt.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Petr Mladek <pmladek@...e.com>,
	Sergey Senozhatsky <senozhatsky@...omium.org>,
	Steven Rostedt <rostedt@...dmis.org>, Will Deacon <will@...nel.org>
Subject: Re: [PATCH 0/3] Allow to enable PREEMPT_RT.

On 2024-09-10 10:39:45 [+0800], Mingcong Bai wrote:
> Hi Sebastian,
Hi Mingcong,

> Congratulations, it's been a long time coming!
thank you.

> I'm wondering, for the architectures not included in the enablement this
> time, do we have a readiness checklist/guide for maintainers to refer to?

I don't think there is. The plain PREEMPT should work. Then need to
follow the checklist for forced-threaded interrupts. Generic code such
as GENERIC_ENTRY makes things easier but at least
HAVE_POSIX_CPU_TIMERS_TASK_WORK is needed with kvm enabled if my memory
serves me right. Everything else is part of generic code.

> Thanks in advance.
> Best Regards,
> Mingcong Bai

Sebastian