Re: [Qemu-devel] [PATCH 1/1] Add usb option in machine options.

[Alexander Graf]

On 06/15/2012 02:46 PM, Li Zhang wrote:
> On Fri, Jun 15, 2012 at 7:09 PM, Andreas Färber<address@hidden>  wrote:
> > You don't seem to be getting what I'm saying: As discussed in great
> > lengths for how to access a passed-in device tree for ARM, the code
> > checking this option (i.e., in spapr.c) is expected to call
> > qemu_opt_get() itself, instead of saving its value globally in vl.c. For
> > example:
> >
> > machine_opts = qemu_opts_find(qemu_find_opts("machine"), 0);
> > usb_opt = qemu_opt_get(machine_opts, "usb");
> > if (strcmp(usb_opt, "off") != 0) {
> >     // set up OHCI
> > }
> I see.
> I  just thought if every machine has the same code, it can be done in vl.c.
> Isn't  the global variable good ?

No, global variables are always bad :). If you see code duplication, 
just throw the interesting bit into a static inline function in a header 
and have the users call that.


Alex