Stefan Roese <m...@stefan-roese.de> wrote on 2011/04/13 17:21:33: > > 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.
OK > > > 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. Since the size is only 4 it would not use dcbX anyway(I think). Then is is probably called with the wrong addresses? Jocke _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
