FTrace on MPC8xx
ml at stefan-roese.de
Thu Apr 14 01:21:33 EST 2011
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
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
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