linux-kernel - Re: [PATCH] x86/Xen: streamline (and fix) PV CPU enumeration

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Date:   Wed, 27 Mar 2019 13:07:19 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Jan Beulich <JBeulich@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Juergen Gross <jgross@...e.com>
Cc:     xen-devel <xen-devel@...ts.xenproject.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/Xen: streamline (and fix) PV CPU enumeration

On 3/27/19 11:12 AM, Jan Beulich wrote:
> -
> -static void __init xen_filter_cpu_maps(void)
> +static void __init _get_smp_config(unsigned int early)
>  {
>  	int i, rc;
>  	unsigned int subtract = 0;
>  
> -	if (!xen_initial_domain())
> +	if (early)
>  		return;
>  
>  	num_processors = 0;


Is there a reason to set_cpu_possible() here (not in the diff, but in
this routine)? This will be called from setup_arch() before
prefill_possible_map(), which will clear and then re-initialize
__cpu_possible_mask.



-boris