linux-kernel - Re: [PATCH] printk: inject caller information into the body of message

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Message-ID: <20180524022143.GB23443@jagdpanzerIV>
Date:   Thu, 24 May 2018 11:21:43 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Petr Mladek <pmladek@...e.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        syzkaller <syzkaller@...glegroups.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Fengguang Wu <fengguang.wu@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] printk: inject caller information into the body of
 message

On (05/18/18 15:08), Dmitry Vyukov wrote:
[..]
> >> What consoles do support it?
> >> We are interested at least in qemu console, GCE console and Android
> >> phone consoles. But it would be pity if this can't be used on various
> >> development boards too.
> >
> > Only the netconsole is able to show the extended (dict)
> > information at the moment. Search for CON_EXTENDED flag.
> 
> Then we won't be able to use it. And we can't pipe from devkmsg_read
> in user-space, because we need this to work when kernel is broken in
> various ways...

Hmm. Well, basically, any console that has CON_EXTENDED bit set; which
is, probably, only netconsole at this point. Do you use slow serial
consoles?

OK, seems like extended printk records won't make you happy after all :)

	-ss