Re: [Qemu-devel] [Qemu-ppc] [PATCH 4/4] ppc: remove excessive logging

[Riku Voipio <riku.voipio@iki.fi>]

On Sat, Jul 12, 2014 at 04:06:09PM +0200, Joakim Tjernlund wrote:
> Alexander Graf <agraf@suse.de> wrote on 2014/07/12 12:41:05:
> > 
> > On 12.07.14 12:40, Peter Maydell wrote:
> > > On 12 July 2014 10:39, Alexander Graf <agraf@suse.de> wrote:
> > >> On 12.07.14 10:58, Peter Maydell wrote:
> > >>> On 12 July 2014 01:39, Alexander Graf <agraf@suse.de> wrote:
> > >>>> What do the other platforms do on illegal instructions during user 
> mode?
> > >>>> Any way we can get consistency across the board?
> > >>> Mostly it looks like they just silently generate the SIGILL.
> > >>> Consistency has never been our strong point :-)
> > >>
> > >> That means this patch brings things towards consistency? It's 
> certainly good
> > >> for me then :)
> > > No, this just removes one use of this logging. If you
> > > wanted consistency we should remove all of them...
 
> > Agreed :)
 
> So can I infer from this discussion that you will apply the patch?

I think Peter and Alex suggest that the EXCP_DUMP() loggings should be
removed from all cases in PPC code where TARGET_SIGILL is risen. Your
patch removes just once case, and that would make PPC code become
internally inconsistent where some SIGILLs are logged and others aren't.

Even more dramatically, we remove the whole EXCP_DUMP and users since none
of the other archs output anything for SIGFPE/SIGSEGV either. After all,
the Linux kernel (ppc or others) doesn't output anything either. And
it is the behaviour of linux we try to match.

Riku