Re: [PATCH 1/1] vhost: Protect the virtqueue from being cleared whilst still in use

Michael S. Tsirkin
2022-03-08T11:05:36Z

On Tue, Mar 08, 2022 at 09:57:57AM +0100, Greg KH wrote:
> > > And what happens if the mutex is locked _RIGHT_ after you checked it?
> > > You still have a race...
> >
> > No, we miss a warning that one time. Memory is still protected.
>
> Then don't warn on something that doesn't matter. This line can be
> dropped as there's nothing anyone can do about it, right?

I mean, the reason I wanted the warning is because there's a kernel
bug, and it will break userspace. warning is just telling us this.
is the bug reacheable from userspace? if we knew that we won't
need the lock ...

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MST