linux-kernel - Re: [PATCH 09/11] x86/boot: Support parallel startup of secondary CPUs

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Message-ID: <e0ead5eafb83937ca6a9cacd5bcda2a1a862b078.camel@infradead.org>
Date:   Tue, 14 Dec 2021 11:33:10 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        rcu@...r.kernel.org, mimoja@...oja.de, hewenliang4@...wei.com,
        hushiyuan@...wei.com, luolongjun@...wei.com, hejingxian@...wei.com
Subject: Re: [PATCH 09/11] x86/boot: Support parallel startup of secondary
 CPUs

On Thu, 2021-12-09 at 16:50 +0100, Peter Zijlstra wrote:
> On Thu, Dec 09, 2021 at 03:09:36PM +0000, David Woodhouse wrote:
> 
> > +	lock
> > +	btrl	$0, (%rax)
> 
> 
> > +	lock
> > +	btsw	$0, tr_lock
> 
> I find that really weird style, but whatever..

I think it's fairly gratuitous too. There's no reason we can't use btsl
even in .code16. I'll fix it.

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