linux-kernel - Re: [PATCH v5 1/4] printk/nmi: generic solution for safe printk in NMI

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Message-ID: <20170428135810.gljrbuwgrypu5jkn@hirez.programming.kicks-ass.net>
Date:   Fri, 28 Apr 2017 15:58:10 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Russell King <rmk+kernel@....linux.org.uk>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Jiri Kosina <jkosina@...e.com>, Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Chris Metcalf <cmetcalf@...hip.com>,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-arm-kernel@...ts.infradead.org,
        adi-buildroot-devel@...ts.sourceforge.net,
        linux-cris-kernel@...s.com, linux-mips@...ux-mips.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        Jan Kara <jack@...e.cz>, Ralf Baechle <ralf@...ux-mips.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        David Miller <davem@...emloft.net>
Subject: Re: [PATCH v5 1/4] printk/nmi: generic solution for safe printk in
 NMI

On Fri, Apr 28, 2017 at 03:44:23PM +0200, Petr Mladek wrote:
> On Fri 2017-04-28 11:02:26, Peter Zijlstra wrote:
> > On Thu, Apr 27, 2017 at 03:38:19PM +0200, Petr Mladek wrote:
> > > Also we need to look for alternatives. There is a chance
> > > to create crashdump and get the ftrace messages from it.
> > > Also this might be scenario when we might need to suggest
> > > the early_printk() patchset from Peter Zijlstra.
> > 
> > I'd be happy to repost those. I still carry them in my tree.
> 
> You do not need to if they are still the same as
> https://lkml.kernel.org/r/20161018170830.405990950@infradead.org

More or less, I think I fixed an intermediate compile fail reported by
you and the 0-day thing and I wrote a few comments in the last patch.

They live here fwiw:

  git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git debug/tmp

> I rather do not promise anything but I would like to look at them
> within next few weeks (after the merge window).

Sure, I'll post them again during/after the merge window.