Re: [RFC PATCH 06/13] x86/uintr: Introduce uintr receiver syscalls

[Greg KH]

On Mon, Sep 27, 2021 at 04:20:25PM -0700, Sohil Mehta wrote:
> On 9/23/2021 5:26 AM, Greg KH wrote:
> > On Mon, Sep 13, 2021 at 01:01:25PM -0700, Sohil Mehta wrote:
> > > +
> > > +/* User Posted Interrupt Descriptor (UPID) */
> > > +struct uintr_upid {
> > > +	struct {
> > > +		u8 status;	/* bit 0: ON, bit 1: SN, bit 2-7: reserved */
> > > +		u8 reserved1;	/* Reserved */
> > > +		u8 nv;		/* Notification vector */
> > > +		u8 reserved2;	/* Reserved */
> > What are these "reserved" for?
> 
> 
> The UPID is an architectural data structure defined by the hardware. The
> reserved fields are defined by the hardware (likely to keep the structure
> size as 16 bytes).

Then those values must be set to 0, right?  I think I missed the part of
the code that set them, hopefully it's somewhere...

thanks,

greg k-h