Re: [Intel-gfx] [PATCH v12 07/24] vfio: Block device access via device fd until device is opened

Jason Gunthorpe
2023-06-13T17:19:24Z

On Tue, Jun 13, 2023 at 08:16:47AM -0600, Alex Williamson wrote:

> > Not quite get why bit field is going to be incompatible with smp
> > lockless operations. Could you elaborate a bit? And should I define
> > the access_granted as u8 or "u8:1"?
>
> Perhaps FUD on my part, but load-acquire type operations have specific
> semantics and it's not clear to me that they interest with compiler
> generated bit operations. Thanks,

They won't compile if you target bit ops, you can't take the address
of a bitfield.

Jason