From: Stefan Roese <ml@stefan-roese.de>
To: Joakim Tjernlund <joakim.tjernlund@transmode.se>
Cc: Scott Wood <scottwood@freescale.com>, linuxppc-dev@lists.ozlabs.org
Subject: Re: FTrace on MPC8xx
Date: Wed, 13 Apr 2011 17:21:33 +0200 [thread overview]
Message-ID: <201104131721.34123.ml@stefan-roese.de> (raw)
In-Reply-To: <OF32A80193.EF3E454E-ONC1257871.005204A6-C1257871.00523F24@transmode.se>
Hi Joakim,
On Wednesday 13 April 2011 16:58:21 Joakim Tjernlund wrote:
> > This is on a 2.6.38 kernel (2.6.32 fails too). Debugging shows that
> > __copy_tofrom_user() fails with return code 4 (called via
> > ftrace_modify_code()).
> >
> > Before digging deeper: Has anybody tried/tested ftrace on MPC8xx? Any
> > ideas what going wrong here?
>
> Just an idea, remove the usage of dcbX insn, these has been problematic
> before.
I originally tested with 2.6.32. Same problem there. And your 8xx patches with
the dcbX changes are not included in 2.6.32 yet.
> How big was the size to copy_tofrom_user()? Did it mange to copy
> any bytes?
The size in __copy_tofrom_user is 4. And its the first call in
ftrace_modify_code() that fails directly. This works just fine on a PPC440EPx
board.
Best regards,
Stefan
next prev parent reply other threads:[~2011-04-13 15:21 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-13 14:32 FTrace on MPC8xx Stefan Roese
2011-04-13 14:58 ` Joakim Tjernlund
2011-04-13 15:21 ` Stefan Roese [this message]
2011-04-13 15:38 ` Joakim Tjernlund
2011-04-14 15:59 ` Stefan Roese
2011-04-14 16:49 ` Joakim Tjernlund
2011-04-14 19:21 ` Joakim Tjernlund
2011-04-15 7:22 ` Stefan Roese
2011-04-15 8:46 ` Joakim Tjernlund
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