linux-kernel - Re: [RFC PATCH v3 4/8] arm64: Handle early CPU boot failures

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Message-ID: <566FFB87.9030208@arm.com>
Date:	Tue, 15 Dec 2015 11:37:43 +0000
From:	"Suzuki K. Poulose" <Suzuki.Poulose@....com>
To:	<linux-arm-kernel@...ts.infradead.org>
CC:	<linux-kernel@...r.kernel.org>, <mark.rutland@....com>,
	<will.deacon@....com>, <catalin.marinas@....com>,
	<marc.zyngier@....com>, James Morse <James.Morse@....com>
Subject: Re: [RFC PATCH v3 4/8] arm64: Handle early CPU boot failures

On 09/12/15 09:57, Suzuki K. Poulose wrote:
> A secondary CPU could fail to come online due to insufficient
> capabilities and could simply die or loop in the kernel.
> e.g, a CPU with no support for the selected kernel PAGE_SIZE
> loops in kernel with MMU turned off.
> or a hotplugged CPU which doesn't have one of the advertised
> system capability will die during the activation.


>   #ifdef CONFIG_HOTPLUG_CPU
> +     update_cpu_boot_status(CPU_KILL_ME);
>       /* Check if we can park ourselves */
>       if (cpu_ops[cpu] && cpu_ops[cpu]->cpu_die)
>               cpu_ops[cpu]->cpu_die(cpu);
>   #endif
> +     update_cpu_boot_status(CPU_STUCK_IN_KERNEL);
> +     __flush_dcache_area(&secondary_data, sizeof(secondary_data));

James pointed out that we don't need the explicit ___flush_dcache_area (which is a left over
from previous version). I have fixed this locally.


Thanks
Suzuki
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