On 13/12/12 12:06, Alexander Graf wrote:
>
> On 12.12.2012, at 21:12, Christian Borntraeger wrote:
>
>> On 12/12/12 19:31, Alexander Graf wrote:
>> +static inline long do_kvm_notify(struct subchannel_id schid,
>>>> + unsigned long queue_index)
>>>> +{
>>>> + register unsigned long __nr asm("1") = KVM_S390_VIRTIO_CCW_NOTIFY;
>>>> + register struct subchannel_id __schid asm("2") = schid;
>>>
>>> How does the compiler know that the struct fits within a register?
>>>
>>
>> Well it knows that sizeof struct subchannel_id is 4.
>
> How so? The asm/ccwdev.h header simply says
>
> struct subchannel_id;
see original patch:
>>> +#include <asm/cio.h>
>>> +#include <asm/ccwdev.h>
>>> +#include <asm/schid.h>
>>> +
>>> +/*
>>> + * virtio related functions
>>> + */
>>> +
asm/schid.h includes uapi/asm/schid.h and that contains the definition.
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