linux-kernel - Re: [PATCH V4] kernel, add bug_on

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Message-ID: <20141028124425.GD3274@tassilo.jf.intel.com>
Date:	Tue, 28 Oct 2014 05:44:25 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Prarit Bhargava <prarit@...hat.com>, linux-kernel@...r.kernel.org,
	Jonathan Corbet <corbet@....net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"H. Peter Anvin" <hpa@...or.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Fabian Frederick <fabf@...net.be>,
	isimatu.yasuaki@...fujitsu.com, linux-doc@...r.kernel.org,
	kexec@...ts.infradead.org, linux-api@...r.kernel.org,
	jason.wessel@...driver.com
Subject: Re: [PATCH V4] kernel, add bug_on_warn

> > I suppose ... but that would mean I would have to explain to an end user the
> > elaborate process of enabling kdb, inserting a break point, etc.  The whole
> > purpose of this is to let an end user panic on WARN() easily.
> > 
> > Asking an end user to enable kdb is magnitudes worse than asking them to
> > recompile a kernel.
> 
> Agreed. Asking a customer to setup and run kdb and put breakpoints is much
> more pain than simply asking to reboot kernel with a command line option.

If you have a command line option to execute kdb commands you still
would only have a command line option, just a slightly longer one.

kdb="on, bp warn_slowpath_common sr c, go" 

But it would be a generic facility instead of a special purpose hack.

-Andi

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