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Message-ID: <1458304786.3600.4.camel@gmail.com>
Subject: Re: 4.5.0+ panic when setup loop device
From: Mike Galbraith <umgwanakikbuti@gmail.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>,
        Xiong Zhou <jencce.kernel@gmail.com>,
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        Ingo Molnar <mingo@kernel.org>, Borislav Petkov <bp@alien8.de>,
        Andreas Herrmann <aherrmann@suse.com>
Date: Fri, 18 Mar 2016 13:39:46 +0100
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On Fri, 2016-03-18 at 12:55 +0100, Thomas Gleixner wrote:

> Does the patch below fix the wreckage?

Yup, all better.

> diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
> index 643dbdccf4bc..c5ac71276076 100644
> --- a/arch/x86/kernel/smpboot.c
> +++ b/arch/x86/kernel/smpboot.c
> @@ -319,7 +319,7 @@ static void __init smp_init_package_map(void)
>          * might change in the future....
>          */
>         ncpus = boot_cpu_data.x86_max_cores * smp_num_siblings;
> -       __max_logical_packages = DIV_ROUND_UP(nr_cpu_ids, ncpus);
> +       __max_logical_packages = DIV_ROUND_UP(total_cpus, ncpus);
>  
>         /*
>          * Possibly larger than what we need as the number of apic
> ids per