RE: [patch 08/15] x86/vdso: Move VDSO clocksource state tracking to callback

[Michael Kelley]

From: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Sent: Tuesday, January 14, 2020 10:53 AM
> 
> All architectures which use the generic VDSO code have their own storage
> for the VDSO clock mode. That's pointless and just requires duplicate code.
> 
> X86 abuses the function which retrieves the architecture specific clock
> mode storage to mark the clocksource as used in the VDSO. That's silly
> because this is invoked on every tick when the VDSO data is updated.
> 
> Move this functionality to the clocksource::enable() callback so it gets
> invoked once when the clocksource is installed. This allows to make the
> clock mode storage generic.
> 
> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

Reviewed-by: Michael Kelley <mikelley@xxxxxxxxxxxxx>  (Hyper-V parts)