linux-kernel - Re: [PATCH 2/2] MIPS: Fix deferred console messages during CPU hotplug

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Message-ID: <20100531044144.GA20358@linux-sh.org>
Date:	Mon, 31 May 2010 13:41:45 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Kevin Cernekee <cernekee@...il.com>
Cc:	Ralf Baechle <ralf@...ux-mips.org>, linux-mips@...ux-mips.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] MIPS: Fix deferred console messages during CPU hotplug

On Sun, May 30, 2010 at 12:35:58AM -0700, Kevin Cernekee wrote:
> diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c
> index 6cdca19..bf8923f 100644
> --- a/arch/mips/kernel/smp.c
> +++ b/arch/mips/kernel/smp.c
> @@ -219,6 +220,10 @@ int __cpuinit __cpu_up(unsigned int cpu)
>  
>  	cpu_set(cpu, cpu_online_map);
>  
> +	/* Flush out any buffered log messages from the new CPU */
> +	if (try_acquire_console_sem() == 0)
> +		release_console_sem();
> +
>  	return 0;
>  }
>  
Since this is entirely generic why not just have kernel/printk.c register
a hotcpu notifier and handle this in the CPU_ONLINE case?
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