linux-kernel - Re: [PATCH 2/2] microblaze: allow developer selection of STACKTRACE

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Date:	Wed, 14 Apr 2010 10:44:11 -0500
From:	"Steven J. Magnani" <steve@...idescorp.com>
To:	monstr@...str.eu
Cc:	microblaze-uclinux@...e.uq.edu.au, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] microblaze: allow developer selection of STACKTRACE

On Wed, 2010-04-14 at 17:25 +0200, Michal Simek wrote:
> Steven J. Magnani wrote:
> > Allow the developer to configure STACKTRACE to enable userland access to backtraces in /proc/NN/stack.
> > 
> > Signed-off-by: Steven J. Magnani <steve@...idescorp.com>
> > ---
> > diff -uprN a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
> > --- a/arch/microblaze/Kconfig	2010-04-09 21:52:36.000000000 -0500
> > +++ b/arch/microblaze/Kconfig	2010-04-12 22:16:01.000000000 -0500
> > @@ -136,6 +136,14 @@ config PROC_DEVICETREE
> >  	  an image of the device tree that the kernel copies from Open
> >  	  Firmware or other boot firmware. If unsure, say Y here.
> >  
> > +config PROC_BACKTRACE
> > +	bool "Support for kernel backtraces in /proc/NN/stack"
> > +	default n
> > +	select STACKTRACE
> > +	help
> > +	  This option adds a backtrace of the kernel stack to /proc/NN/stack.
> > +	  If unsure, say N here.
> > +
> 
> Why did you create new Kconfig option? /proc/NN/stack is there when you 
> enable stacktrace support. There is not necessary to enable any new option.
> 
> Or is there any other point which I am missing?

AFAICT STACKTRACE is an embedded option that isn't presented in the
menu. If all you want is /proc/NN/stack without the baggage of kmemleak,
tracing, etc., I didn't see a way to configure it.

This probably belongs somewhere more generic, maybe lib/Kconfig.debug?

Steve


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