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

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Message-ID: <20240917104409.b9nGBsc8@linutronix.de>
Date: Tue, 17 Sep 2024 12:44:09 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Palmer Dabbelt <palmer@...belt.com>
Cc: namcao@...utronix.de, tglx@...utronix.de,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org, x86@...nel.org, hpa@...or.com,
	aou@...s.berkeley.edu, bp@...en8.de,
	Catalin Marinas <catalin.marinas@....com>, williams@...hat.com,
	dave.hansen@...ux.intel.com, mingo@...hat.com,
	john.ogness@...utronix.de, Paul Walmsley <paul.walmsley@...ive.com>,
	pmladek@...e.com, senozhatsky@...omium.org, rostedt@...dmis.org,
	Will Deacon <will@...nel.org>
Subject: Re: [PATCH 3/3] riscv: Allow to enable PREEMPT_RT.

On 2024-09-06 11:48:03 [-0700], Palmer Dabbelt wrote:
> I don't have a test setup yet, but I figure it's a new feature so I'll just
> flip it on as a config post-rc1.  Presumably this just works in the QEMU
> virt board, or is there some wizardry I'll need to copy?

I don't think you want to enable it by default for everyone. The riscv
defconfig sets CONFIG_PREEMPT_NONE=y by default. For testing you need to
flip this to CONFIG_PREEMPT_RT=y and since CONFIG_EXPERT=y is already
set this option is available.
And yes, it works on the virt board and there is no wizardry needed ;)

Sebastian