linux-kernel - Re: [PATCH-next 2/3] sysctl/sysrq: Remove __sysrq

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Date:   Thu, 9 Jan 2020 19:19:03 -0800
From:   Iurii Zaikin <yzaikin@...gle.com>
To:     Dmitry Safonov <dima@...sta.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Vasiliy Khoruzhick <vasilykh@...sta.com>,
        linux-serial@...r.kernel.org, Luis Chamberlain <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Linus FS Devel Mailing List <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH-next 2/3] sysctl/sysrq: Remove __sysrq_enabled copy

> Furthermore, the private copy isn't correct already in case
> sysrq_always_enabled is true. So, remove __sysrq_enabled and use a
> getter-helper for sysrq enabled status.
Since the old way was known to be unreliable, the new way looks like a
great candidate for a KUnit test.

Off topic: I wonder if Magic Sysrq could be extended with reasonable
effort to be triggered by a sequence of keystrokes which would be less
likely to be generated by a noisy serial.