linux-kernel - Re: [PATCH v2] clocksource/drivers/riscv: Get rid of clocksource_arch

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Date:   Fri, 20 Jan 2023 14:09:35 +0000
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     Prabhakar <prabhakar.csengg@...il.com>
CC:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        <linux-riscv@...ts.infradead.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-renesas-soc@...r.kernel.org>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Samuel Holland <samuel@...lland.org>
Subject: Re: [PATCH v2] clocksource/drivers/riscv: Get rid of
 clocksource_arch_init() callback

On Thu, Dec 29, 2022 at 10:46:01PM +0000, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> 
> Having a clocksource_arch_init() callback always sets vdso_clock_mode to
> VDSO_CLOCKMODE_ARCHTIMER if GENERIC_GETTIMEOFDAY is enabled, this is
> required for the riscv-timer.
> 
> This works for platforms where just riscv-timer clocksource is present.
> On platforms where other clock sources are available we want them to
> register with vdso_clock_mode set to VDSO_CLOCKMODE_NONE.
> 
> On the Renesas RZ/Five SoC OSTM block can be used as clocksource [0], to
> avoid multiple clock sources being registered as VDSO_CLOCKMODE_ARCHTIMER
> move setting of vdso_clock_mode in the riscv-timer driver instead of doing
> this in clocksource_arch_init() callback as done similarly for ARM/64
> architecture.
> 
> [0] drivers/clocksource/renesas-ostm.c
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> Tested-by: Samuel Holland <samuel@...lland.org>
> ---
> RFC -> v2
> * Dropped vdso_default static global variable

> * Used IS_ENABLED() macro

Not sure it really makes much difference here either way, but increased
coverage is always good I suppose.

rv32 is the user for the !GENERIC_GETTIMEOFDAY patch IIRC and nothing
seemed obviously amiss there to me either.

Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>


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