linux-kernel - Re: [PATCH 3/7] MIPS: csrc-r4k: Select HAVE_UNSTABLE_SCHED

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Message-ID: <alpine.DEB.2.21.2406012326580.23854@angie.orcam.me.uk>
Date: Sat, 1 Jun 2024 23:30:03 +0100 (BST)
From: "Maciej W. Rozycki" <macro@...am.me.uk>
To: Jiaxun Yang <jiaxun.yang@...goat.com>
cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>, 
    Serge Semin <fancer.lancer@...il.com>, 
    Daniel Lezcano <daniel.lezcano@...aro.org>, 
    Thomas Gleixner <tglx@...utronix.de>, linux-mips@...r.kernel.org, 
    linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/7] MIPS: csrc-r4k: Select HAVE_UNSTABLE_SCHED_CLOCK if
 64BIT

On Sat, 11 May 2024, Jiaxun Yang wrote:

> csrc-r4k suffers from SMP synchronization overhead.
[...]
> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
> index f1aa1bf11166..fa8ca0287568 100644
> --- a/arch/mips/Kconfig
> +++ b/arch/mips/Kconfig
> @@ -1083,6 +1083,7 @@ config CSRC_IOASIC
>  
>  config CSRC_R4K
>  	select CLOCKSOURCE_WATCHDOG if CPU_FREQ
> +	select HAVE_UNSTABLE_SCHED_CLOCK if 64BIT

 Shouldn't it be:

	select HAVE_UNSTABLE_SCHED_CLOCK if 64BIT && SMP

then?

  Maciej