Re: [PATCH] hvmloader: Use xen/errno.h rather than the host systems errno.h

[Ian Campbell <ian.campbell@citrix.com>]

On Fri, 2016-02-19 at 11:09 +0000, Andrew Cooper wrote:
> On 19/02/16 11:00, Ian Campbell wrote:
> > On Fri, 2016-02-19 at 10:50 +0000, Andrew Cooper wrote:
> > > On 19/02/16 10:40, Wei Liu wrote:
> > > > On Thu, Feb 18, 2016 at 10:10:09PM +0000, Andrew Cooper wrote:
> > > > > Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
> > > > > ---
> > > > > CC: Jan Beulich <JBeulich@suse.com>
> > > > > CC: Ian Campbell <Ian.Campbell@citrix.com>
> > > > > CC: Ian Jackson <Ian.Jackson@eu.citrix.com>
> > > > > CC: Wei Liu <wei.liu2@citrix.com>
> > > > > CC: Doug Goldstein <cardoe@cardoe.com>
> > > > > ---
> > > > >  tools/firmware/hvmloader/xenbus.c | 2 +-
> > > > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > > > 
> > > > > diff --git a/tools/firmware/hvmloader/xenbus.c
> > > > > b/tools/firmware/hvmloader/xenbus.c
> > > > > index d0ed993..947d865 100644
> > > > > --- a/tools/firmware/hvmloader/xenbus.c
> > > > > +++ b/tools/firmware/hvmloader/xenbus.c
> > > > > @@ -27,7 +27,7 @@
> > > > >  
> > > > >  #include "util.h"
> > > > >  #include "hypercall.h"
> > > > > -#include <errno.h>
> > > > > +#include <xen/errno.h>
> > > > This doesn't seem to compile for me. Xen's error numbers live in a
> > > > different name space.
> > > It compiled fine for me.  HVMLoader should use __XEN_TOOLS__.
> > It shouldn't and doesn't, see 3237645813d7 which stopped setting
> > __XEN_TOOLS__ globally for all of tools/* and consequently removed the
> > -U__XEN_TOOLS__ from hvmloader.
> > 
> > In any case I don't think __XEN_TOOLS__ has any impact on xen/errno.h
> > (which is, perhaps confusingly, xen/include/public/errno.h and not
> > xen/include/xen/errno.h)
> > 
> > For normal userspace uses of __XEN_TOOLS__ you wouldn't want unprefixed
> > Xen
> > errno values added to your namespace anyway -- since you need to deal
> > with
> > OS errno names/values.
> 
> HVMloader is an unhosted 32bit environment, which is why it should not
> be using the hosts errno.h in the first place.

Of course I know this, and it has nothing to do with anything I explained
above.

Ian.

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