linux-kernel - Re: [PATCH] x86, cpu: trivial printk formatting fixes

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Date:	Sat, 01 Nov 2014 10:17:53 -0700
From:	Joe Perches <joe@...ches.com>
To:	Steven Honeyman <stevenhoneyman@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Jiri Kosina <trivial@...nel.org>,
	x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86, cpu: trivial printk formatting fixes

On Sat, 2014-11-01 at 15:44 +0000, Steven Honeyman wrote:
> A 2 line printk makes dmesg output messy, because the second line does not get a timestamp.
> For example:
[]
> diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
[]
> @@ -487,10 +487,8 @@ static void init_intel(struct cpuinfo_x86 *c)
>  
>  		rdmsrl(MSR_IA32_ENERGY_PERF_BIAS, epb);
>  		if ((epb & 0xF) == ENERGY_PERF_BIAS_PERFORMANCE) {
> -			printk_once(KERN_WARNING "ENERGY_PERF_BIAS:"
> -				" Set to 'normal', was 'performance'\n"
> -				"ENERGY_PERF_BIAS: View and update with"
> -				" x86_energy_perf_policy(8)\n");
> +			pr_info_once("ENERGY_PERF_BIAS: Set to 'normal', was 'performance'\n");
> +			pr_info_once("ENERGY_PERF_BIAS: View and update with x86_energy_perf_policy(8)\n");

This changes the logging level.

You should either mention why in the changelog
or use pr_warn_once


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