linux-kernel - Re: [PATCH v6 01/19] kernel: Standardize vdso

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Message-ID: <20190610092751.GA11076@merlot.physics.ox.ac.uk>
Date:   Mon, 10 Jun 2019 10:27:52 +0100
From:   Huw Davies <huw@...eweavers.com>
To:     Vincenzo Frascino <vincenzo.frascino@....com>
Cc:     linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-kselftest@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Russell King <linux@...linux.org.uk>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Mark Salyzyn <salyzyn@...roid.com>,
        Peter Collingbourne <pcc@...gle.com>,
        Shuah Khan <shuah@...nel.org>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: Re: [PATCH v6 01/19] kernel: Standardize vdso_datapage

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.