Il 29/05/2013 15:24, Michael S. Tsirkin ha scritto:
> You expect a compiler to pad this structure:
>
> struct foo {
> uint8_t a;
> uint8_t b;
> uint16_t c;
> uint32_t d;
> };
>
> I'm guessing any compiler that decides to waste memory in this way
> will quickly get dropped by users and then we won't worry
> about building QEMU with it.
You know the virtio-pci config structures are padded, but not all of
them are. For example, virtio_balloon_stat is not padded and indeed has
an __attribute__((__packed__)) in the spec.
For this reason I prefer to have the attribute everywhere. So people
don't have to wonder why it's here and not there.
Paolo
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