linux-kernel - Re: [PATCH V3b] x86, cpu: trivial printk formatting fixes

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Message-ID: <20141105231032.GG5245@pd.tnic>
Date:	Thu, 6 Nov 2014 00:10:32 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Steven Honeyman <stevenhoneyman@...il.com>
Cc:	Joe Perches <joe@...ches.com>,
	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 V3b] x86, cpu: trivial printk formatting fixes

On Wed, Nov 05, 2014 at 10:52:18PM +0000, Steven Honeyman wrote:
> dmesg (from util-linux) currently has two methods for reading the kernel message ring buffer: /dev/kmsg and syslog(2). Since kernel 3.5.0 kmsg has been the default, which escapes control characters (e.g. new lines) before they are shown.
> 
> This change means that when dmesg is using /dev/kmsg, a 2 line printk makes the output messy, because the second line does not get a timestamp.
> For example:
> 
> [    0.012863] CPU0: Thermal monitoring enabled (TM1)
> [    0.012869] Last level iTLB entries: 4KB 1024, 2MB 1024, 4MB 1024
> Last level dTLB entries: 4KB 1024, 2MB 1024, 4MB 1024, 1GB 4
> [    0.012958] Freeing SMP alternatives memory: 28K (ffffffff81d86000 - ffffffff81d8d000)
> [    0.014961] dmar: Host address width 39
> 
> Because printk.c intentionally escapes control characters, they should not be there in the first place.
> This patch fixes two occurrences of this.
> 
> V2: Revert change to log level, only fix the newline formatting issue
> V3: Expand patch description
> V3b: Fix silly mistake (log level) 
> 
> Signed-off-by: Steven Honeyman <stevenhoneyman@...il.com>

Acked-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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