On Fri, 3 Mar 2017, Stephen Hemminger wrote:
> static inline u64 hv_read_tsc_page(const struct ms_hyperv_tsc_page *tsc_pg)
> {
> u64 scale, offset, cur_tsc;
> u32 start;
>
> /*
>* The protocol for reading Hyper-V TSC page is specified in Hypervisor
>* Top-Level
Minor coding comments
> diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
> index d324dce..4ff25436 100644
> --- a/arch/x86/include/asm/mshyperv.h
> +++ b/arch/x86/include/asm/mshyperv.h
> @@ -178,6 +178,56 @@ void hyperv_cleanup(void);
> #endif
> #ifdef
As a preparation to making Hyper-V TSC page suitable for vDSO move
the TSC page reading logic to asm/mshyperv.h. While on it, do the
following
- Document the reading algorithm.
- Simplify the code a bit.
- Add explicit READ_ONCE() to not rely on 'volatile'.
- Add explicit barriers to prevent
