linux-kernel - Re: [PATCH] efi: Allow to enable EFI runtime services with PREEMPT

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Date:   Thu, 31 Mar 2022 16:40:15 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Javier Martinez Canillas <javierm@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Peter Jones <pjones@...hat.com>,
        Alexander Larsson <alexl@...hat.com>,
        Al Stone <ahs3@...hat.com>, linux-efi@...r.kernel.org,
        Ard Biesheuvel <ardb@...nel.org>,
        Andrew Halaney <ahalaney@...hat.com>,
        linux-rt-users@...r.kernel.org, Brian Masney <bmasney@...hat.com>,
        Robbie Harwood <rharwood@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] efi: Allow to enable EFI runtime services with PREEMPT_RT

On 2022-03-31 16:25:40 [+0200], Javier Martinez Canillas wrote:
> Hello Sebastian,
Hi Javier,

> Yes, it is but the motivation is to be able to have EFI runtime services
> by default without the need for any kernel command line parameter.

This part wasn't clear. It is not mentioned by the description but now
that I look at Kconfig, it is there.

> In the same vein, I could ask if efi=noruntime wasn't enough instead of
> commit ("efi: Disable runtime services on RT").

No, it is not because it should not lead to any surprise latencies by
default.

Sebastian