linux-kernel - Re: [PATCH v3 4/4] printk/nmi: Increase the size of NMI buffer and make it configurable

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Message-ID: <alpine.LNX.2.00.1512120024370.9922@cbobk.fhfr.pm>
Date:	Sat, 12 Dec 2015 00:26:11 +0100 (CET)
From:	Jiri Kosina <jikos@...nel.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Petr Mladek <pmladek@...e.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Daniel Thompson <daniel.thompson@...aro.org>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"adi-buildroot-devel@...ts.sourceforge.net" 
	<adi-buildroot-devel@...ts.sourceforge.net>,
	Cris <linux-cris-kernel@...s.com>,
	Linux MIPS Mailing List <linux-mips@...ux-mips.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	linux-s390 <linux-s390@...r.kernel.org>,
	Linux-sh list <linux-sh@...r.kernel.org>,
	sparclinux <sparclinux@...r.kernel.org>
Subject: Re: [PATCH v3 4/4] printk/nmi: Increase the size of NMI buffer and
 make it configurable

On Fri, 11 Dec 2015, Russell King - ARM Linux wrote:

> I'm personally happy with the existing code, and I've been wondering why
> there's this effort to apply further cleanups - to me, the changelogs
> don't seem to make that much sense, unless we want to start using
> printk() extensively in NMI functions - using the generic nmi backtrace
> code surely gets us something that works across all architectures...

It is already being used extensively, and not only for all-CPU backtraces. 
For starters, please consider

- WARN_ON(in_nmi())
- BUG_ON(in_nmi())
- anything being printed out from MCE handlers

-- 
Jiri Kosina
SUSE Labs

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