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

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Message-ID: <mhng-5582a629-6b81-4a32-bcbe-02f2e177fe99@palmer-ri-x1c9>
Date: Wed, 09 Oct 2024 09:47:20 -0700 (PDT)
From: Palmer Dabbelt <palmer@...belt.com>
To: bigeasy@...utronix.de
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 Tue, 17 Sep 2024 03:44:09 PDT (-0700), bigeasy@...utronix.de wrote:
> 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 ;)

Sorry I missed this.  Just in case anyone's curious: I'm not flipping it 
on by default or anything, just adding a CONFIG_PREEMPT_RT=y 
configuration to the list of things I test before pushing to 
for-next or fixes.

>
> Sebastian