linux-kernel - Re: [PATCH 1/6] x86: Limit the number of processor bootup messages

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Message-ID: <20091116212216.GA2221@elte.hu>
Date:	Mon, 16 Nov 2009 22:22:16 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Mike Travis <travis@....com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Roland Dreier <rdreier@...co.com>,
	Randy Dunlap <rdunlap@...otime.net>, Tejun Heo <tj@...nel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	David Rientjes <rientjes@...gle.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Jack Steiner <steiner@....com>,
	Frederic Weisbecker <fweisbec@...il.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] x86: Limit the number of processor bootup messages


* Mike Travis <travis@....com> wrote:

> +	if (cpu == 0)
> +		printk(KERN_INFO "CPU0: Thermal monitoring enabled (%s)\n",
> +		       tm2 ? "TM2" : "TM1");

Hm, 'cpu==0 means boot cpu' assumptions are not particularly clean.

> +#ifdef CONFIG_NUMA
> +	if (system_state == SYSTEM_BOOTING) {
> +		static int current_node = -1;
> +		int node = cpu_to_node(cpu);
> +
> +		if (node != current_node) {
> +			if (current_node > (-1))
> +				pr_cont(" Ok.\n");
> +			current_node = node;
> +			pr_info("Booting Node %3d, Processors ", node);
> +		}
> +		pr_cont(" #%d%s", cpu, cpu == (nr_cpu_ids - 1) ? " Ok.\n" : "");
> +	} else
> +#endif
> +		pr_info("Booting Processor %d APIC 0x%x\n", cpu, apicid);

preprocessor directives cutting into if/else branches in an assymetric 
way is being frowned upon. I'd also suggest to put this into a helper 
inline.

Is the SYSTEM_BOOTING check there to not re-print this on CPU hotplug?

	Ingo
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