linux-kernel - Re: [PATCH 3/6] x86/smpboot: Remove initial

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Message-ID: <bee3389fbdfbfacaa219e0c3987b9e1f24ca47c2.camel@infradead.org>
Date:   Thu, 23 Feb 2023 08:27:07 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Brian Gerst <brgerst@...il.com>, linux-kernel@...r.kernel.org,
        x86@...nel.org
Cc:     Usama Arif <usama.arif@...edance.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH 3/6] x86/smpboot: Remove initial_stack on 64-bit

On Thu, 2023-02-23 at 08:05 +0000, David Woodhouse wrote:
> 
> 
> Aren't all CPUs taking this .Linit_cpu0_data path for non-parallel
> startup, not just cpu0? I think you want something more like
> 
> .Linit_cpuN_data:
> 	orl	$0x0fffffff, %edx
> 	leaq	__per_cpu_offset(%rip), %rbx
> 	movq	(%rbx,%rdx,8), %rdx
> 	jmp	.Lsetup_cpu
>  

Er, nope. Forget that. More coffee...

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