linux-kernel - Re: [PATCH] kdb: Add message about CONFIG_DEBUG

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Message-ID: <4F6A17F0.8060204@windriver.com>
Date:	Wed, 21 Mar 2012 13:03:28 -0500
From:	Jason Wessel <jason.wessel@...driver.com>
To:	Tim Bird <tim.bird@...sony.com>
CC:	"kgdb-bugreport@...ts.sourceforge.net" 
	<kgdb-bugreport@...ts.sourceforge.net>,
	linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kdb: Add message about CONFIG_DEBUG_RODATA on failure
 to install breakpoint


On 03/20/2012 04:55 PM, Jason Wessel wrote:
> 

> Obviously we are not going to go down  the horrible hack route, so I
> thought I might look at how the kprobe implementation works, because
> they  do deal with read-only  pages.  They created a function called
> text_poke() that is called from arch_arm_probe().
>
> It might be possible to take a short cut and use the
> arch_arm_probe() directly.  Ultimately I would like to consider just
> using kprobes instead for things like single stepping etc..., but it
> still has a few problems with atomic reservations.  This work had
> been shelved in back 2010, in favor of merging kdb.  I am not sure
> if anyone wants to take a look at it, but I do think it might
> warrant some experimentation.


To follow up on this and move to closure, I did some investigation and
concluded it is possible to use the kprobes API to make use of the
text_poke() function.

I sent a patch series out for review with the implementation.

https://lkml.org/lkml/2012/3/21/375

Cheers,
Jason.

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