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

From: Vitaly Kuznetsov
Date: Fri Feb 10 2017 - 09:42:24 EST

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.

BTW, I just occured to me that I should've probably put the TSC reading
code to mshyperv.h and use it from both vDSO and read_hv_clock_tsc() --
what do you thing?