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SubjectRe: [PATCH 1/1] x86: Hyper-V: Mark the Hyper-V clocksource as being high resolution
On Fri, 3 Jul 2015, K. Y. Srinivasan wrote:
> From: Vivek yadav <vyadav@microsoft.com>
>
> By design, alternative clock sources listed are based on the resolution of
> current clock source. Once you set a high resolution clock,
> only high resolution sources are returned.
> Mark Hyper-V clock source as a high resolution clock source.
>
> Signed-off-by: Vivek yadav <vyadav@microsoft.com>
> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
> ---
> arch/x86/kernel/cpu/mshyperv.c | 3 ++-
> 1 files changed, 2 insertions(+), 1 deletions(-)
>
> diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
> index 9b5d7b5..0e507a0 100644
> --- a/arch/x86/kernel/cpu/mshyperv.c
> +++ b/arch/x86/kernel/cpu/mshyperv.c
> @@ -151,7 +151,8 @@ static struct clocksource hyperv_cs = {
> .rating = 400, /* use this when running on Hyperv*/
> .read = read_hv_clock,
> .mask = CLOCKSOURCE_MASK(64),
> - .flags = CLOCK_SOURCE_IS_CONTINUOUS,
> + .flags = CLOCK_SOURCE_IS_CONTINUOUS |
> + CLOCK_SOURCE_VALID_FOR_HRES,

No, this is wrong. The CLOCK_SOURCE_VALID_FOR_HRES flag is managed by
the core code and set when a clocksource fulfils the criteria.

The changelog above is not explaining what problem you are trying to
solve.

Thanks,

tglx




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