Re: [Qemu-devel] question: about exec/poison.h

[Peter Xu <peterx@redhat.com>]

On Mon, Nov 30, 2015 at 09:06:45AM +0100, Markus Armbruster wrote:
> Peter Xu <peterx@redhat.com> writes:
> 
> > Hi, all,
> >
> > I met one problem when trying to add a new public function in dump.h
> > named "dump_state_get_global" and using it in hmp.c. What I got is
> > something like:
> >
> > In file included from /root/git/qemu/hmp.c:35:0:
> > /root/git/qemu/include/sysemu/dump.h:26:34: error: attempt to use
> > poisoned "TARGET_PAGE_BITS"
> >      (((unsigned long long)(X) >> TARGET_PAGE_BITS) - ARCH_PFN_OFFSET)
> >
> > I did a quick look on the poison.h file, seeing that it should be
> > used to avoid using arch-depentent macros in arch-independent
> > codes. That's cool. However, that's also problem to me.
> >
> > The problem is: First of all, dump itself is arch
> > dependent. Meanwhile, hmp.c is not. Also, what I am trying to add is
> > arch indepentent too (just like hmp.c). Now if I include "dump.h" in
> > hmp.c to use that function, I may encounter the error message.
> >
> > I got one idea, which is to split dump.h into two header files:
> > dump.h and dump-arch-indep.h (the latter name could be of course
> > shorter). So that I can move arch independent declarations into that
> > new header file and use it in hmp.h. Not sure whether this is the
> > good one to go.
> >
> > Does anyone have suggestion on what I should do?
> 
> What would the contents of an arch-independent dump.h be?  If it's
> interesting, keeping it in its own header probably makes sense.  If not,
> perhaps we can find an existing header to use.  Can't say more than that
> without seeing the actual contents.

Hi, Markus,

It's related to dump detach support patch set. Then I think I could
first leverage an existing header and post the patch first.

Thanks for the reply.
Peter