Messages in this thread | | | Date | Tue, 28 Sep 2021 06:39:29 +0200 | From | Greg KH <> | Subject | Re: [RFC PATCH 06/13] x86/uintr: Introduce uintr receiver syscalls |
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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
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