linux-kernel - Re: [PATCH v2 19/20] mips: cevt-r4k: Update the r4k-clockevent frequency in sync with CPU

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Message-ID: <20200508154045.GA22247@alpha.franken.de>
Date:   Fri, 8 May 2020 17:40:46 +0200
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Sergey.Semin@...kalelectronics.ru
Cc:     Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Paul Burton <paulburton@...nel.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Rob Herring <robh+dt@...nel.org>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org,
        afzal mohammed <afzal.mohd.ma@...il.com>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 19/20] mips: cevt-r4k: Update the r4k-clockevent
 frequency in sync with CPU

On Wed, May 06, 2020 at 08:42:37PM +0300, Sergey.Semin@...kalelectronics.ru wrote:
> diff --git a/arch/mips/kernel/cevt-r4k.c b/arch/mips/kernel/cevt-r4k.c
> index 17a9cbb8b3df..f5b72fb7d5ee 100644
> --- a/arch/mips/kernel/cevt-r4k.c
> +++ b/arch/mips/kernel/cevt-r4k.c
> @@ -8,6 +8,7 @@
>   */
>  #include <linux/clockchips.h>
>  #include <linux/interrupt.h>
> +#include <linux/cpufreq.h>
>  #include <linux/percpu.h>
>  #include <linux/smp.h>
>  #include <linux/irq.h>
> @@ -250,6 +251,49 @@ unsigned int __weak get_c0_compare_int(void)
>  	return MIPS_CPU_IRQ_BASE + cp0_compare_irq;
>  }
>  
> +#ifdef CONFIG_CPU_FREQ
> +
> +static unsigned long mips_ref_freq;
> +
> +static int cpufreq_callback(struct notifier_block *nb,
> +			    unsigned long val, void *data)

please prefix function names with r4k_ to make them different from
the other ones you implemented in kernel/time.c. I know they are
static, but keeping different names makes looking at crashes easier.

> +	struct cpufreq_freqs *freq = data;
> +	struct clock_event_device *cd;
> +	unsigned long rate;
> +	int cpu;
> +
> +	if (!mips_ref_freq)
> +		mips_ref_freq = freq->old;

isn't this the same as mips_hpt_frequency ?

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]