On Thu, May 30, 2019 at 03:15:13PM +0100, Vincenzo Frascino wrote:
> --- /dev/null
> +++ b/include/vdso/datapage.h
> @@ -0,0 +1,91 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef __VDSO_DATAPAGE_H
> +#define __VDSO_DATAPAGE_H
> +
> +#ifdef __KERNEL__
> +
> +#ifndef __ASSEMBLY__
> +
> +#include <linux/bits.h>
> +#include <linux/time.h>
> +#include <linux/types.h>
> +
> +#define VDSO_BASES   (CLOCK_TAI + 1)
> +#define VDSO_HRES    (BIT(CLOCK_REALTIME)            | \
> +                      BIT(CLOCK_MONOTONIC)           | \
> +                      BIT(CLOCK_BOOTTIME)            | \
> +                      BIT(CLOCK_TAI))
> +#define VDSO_COARSE  (BIT(CLOCK_REALTIME_COARSE)     | \
> +                      BIT(CLOCK_MONOTONIC_COARSE))
> +#define VDSO_RAW     (BIT(CLOCK_MONOTONIC_RAW))
> +
> +#define CS_HRES_COARSE       0
> +#define CS_RAW               1

CS_HRES_COARSE seems like a confusing name choice to me.  What you
really mean is not RAW.

How about CS_ADJ to indicate that its updated by adjtime?
CS_XTIME might be another option.

Huw.

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