Re: [PATCH 2/2] x86/vdso: Add VCLOCK_HVCLOCK vDSO clock read method

From: Thomas Gleixner
Date: Fri Feb 10 2017 - 09:05:13 EST

On Fri, 10 Feb 2017, Vitaly Kuznetsov wrote:

> Stephen Hemminger <sthemmin@xxxxxxxxxxxxx> writes:
> > Why not use existing seqlock's?
> >
> To be honest I don't quite understand how we could use it -- the
> sequence locking here is done against the page updated by the
> hypersior, we're not creating new structures (so I don't understand how
> we could use struct seqcount which we don't have) but I may be
> misunderstanding something.

You can't use seqlock, but you might be able to use seqcount. Though I
doubt it given the 0 check ....