linux-kernel - Re: [PATCH] x86: UV: raw

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Date:   Sun, 6 May 2018 12:26:54 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
cc:     linux-kernel@...r.kernel.org,
        Mike Galbraith <umgwanakikbuti@...il.com>, x86@...nel.org,
        Mike Galbraith <mgalbraith@...e.de>
Subject: Re: [PATCH] x86: UV: raw_spinlock conversion

On Fri, 4 May 2018, Sebastian Andrzej Siewior wrote:

> From: Mike Galbraith <umgwanakikbuti@...il.com>
> 
> Shrug.  Lots of hobbyists have a beast in their basement, right?

This hardly qualifies as a proper changelog ...

>  }
> @@ -299,13 +299,17 @@ static int uv_rtc_unset_timer(int cpu, i
>  static u64 uv_read_rtc(struct clocksource *cs)
>  {
>  	unsigned long offset;
> +	u64 cycles;
>  
> +	preempt_disable();
>  	if (uv_get_min_hub_revision_id() == 1)
>  		offset = 0;
>  	else
>  		offset = (uv_blade_processor_id() * L1_CACHE_BYTES) % PAGE_SIZE;
>  
> -	return (u64)uv_read_local_mmr(UVH_RTC | offset);
> +	cycles = (u64)uv_read_local_mmr(UVH_RTC | offset);
> +	preempt_enable();
> +	return cycles;

And how exaclty is this hunk related?

Thanks,

	tglx