linux-kernel - Re: [PATCH 1/2] x86/tsc: Avoid a double call if TSC initializes earlier.

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Message-ID: <a2d372a3-a7cc-34ae-679d-cf71d243ee04@cn.fujitsu.com>
Date:   Mon, 30 Jul 2018 17:53:44 +0800
From:   Dou Liyang <douly.fnst@...fujitsu.com>
To:     Peter Zijlstra <peterz@...radead.org>
CC:     <linux-kernel@...r.kernel.org>, <x86@...nel.org>,
        <tglx@...utronix.de>, <mingo@...hat.com>, <hpa@...or.com>,
        Pavel Tatashin <pasha.tatashin@...cle.com>
Subject: Re: [PATCH 1/2] x86/tsc: Avoid a double call if TSC initializes
 earlier.

Hi Peter,

At 07/30/2018 05:34 PM, Peter Zijlstra wrote:
> On Mon, Jul 30, 2018 at 03:54:20PM +0800, Dou Liyang wrote:
>> static_branch_enable(&__use_tsc) may be called twice in common case, that
>> is redundant.
> 
> It is also really not a problem...
> 

Yes, right. Just avoid the second useless setting.

Thanks,
	dou

> 
>