linux-kernel - Re: [PATCH RFC 0/3] drivers/char: remove /dev/kmem for good

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Message-ID: <20210322111824.59bac299@gandalf.local.home>
Date:   Mon, 22 Mar 2021 11:18:24 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        "Alexander A. Klimov" <grandmaster@...klimov.de>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Andrew Lunn <andrew@...n.ch>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrey Zhizhikin <andrey.zhizhikin@...ca-geosystems.com>,
        Arnd Bergmann <arnd@...db.de>,
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        Yoshinori Sato <ysato@...rs.sourceforge.jp>
Subject: Re: [PATCH RFC 0/3] drivers/char: remove /dev/kmem for good

On Mon, 22 Mar 2021 11:08:47 +0100
David Hildenbrand <david@...hat.com> wrote:

> 
> Wonder if "echo c > /proc/sysrq-trigger" already existed and would have 
> worked back then. :)
> 
> 

Looks like sysrq-c was added in 2005:

commit 86b1ae38c0a62 ("kdump: sysrq trigger mechanism for kexec based crashdumps")

Thus the answer is "No, it would not have worked back then".

-- Steve