linux-kernel - Re: [GIT PULL] random number generator fixes for 6.2-rc1, part 2

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Message-ID: <Y6FmLZqcf0nmcEMV@hovoldconsulting.com>
Date:   Tue, 20 Dec 2022 08:37:17 +0100
From:   Johan Hovold <johan@...nel.org>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [GIT PULL] random number generator fixes for 6.2-rc1, part 2

On Tue, Dec 20, 2022 at 03:24:58AM +0100, Jason A. Donenfeld wrote:

> In addition, there is one fix:
> 
> - Check efi_rt_services_supported() before attempting to use an EFI runtime
>   function. This affected EFI systems that disable runtime services yet still
>   boot via EFI (e.g. the reporter's Dell arm64 laptop), as well systems where

Nit: This caused trouble on the Lenovo Thinkpad X13s that we're working
on supporting in mainline (i.e. not Dell).

>   EFI runtime services have been forcibly disabled, such as on PREEMPT_RT. On
>   those machines, a very early and hard to diagnose crash would happen,
>   preventing boot.

Johan