linux-kernel - Re: Regression: Spurious "^A" in UML output

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Date:	Thu, 16 Aug 2012 17:03:49 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Joe Perches <joe@...ches.com>
Cc:	uml-devel <user-mode-linux-devel@...ts.sourceforge.net>,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: Regression: Spurious "^A" in UML output

Hi Joe,

On Thu, Aug 16, 2012 at 3:50 PM, Joe Perches <joe@...ches.com> wrote:
> On Thu, 2012-08-16 at 15:17 +0200, Geert Uytterhoeven wrote:
>> In v3.6-rc1 UML, I see spurious "^A" (ASCII 1, SOH) characters in some kernel
>> messages:
>>
>> Calibrating delay loop... 4640.76 BogoMIPS (lpj=23203840)
>> pid_max: default: 32768 minimum: 301
>> Mount-cache hash table entries: 256
>> ^AChecking that host ptys support output SIGIO...Yes
>> ^AChecking that host ptys support SIGIO on close...No, enabling workaround
>> ^AUsing 2.6 host AIO
>> NET: Registered protocol family 16
>> bio: create slab <bio-0> at 0
>> Switching to clocksource itimer
>>
>> This happens for all output using the "printk(UM_KERN_XXX ...)" idiom.
>
> Were these emitted with "KERN_<LEVEL>" string constants
> before this change (not <[0-7]>", but the string text
> KERN_INFO, KERN_WARNING, etc...)?

They were emitted with the "<x>" string constants.

This is used in the userspace part of UML, which runs as a userspace
application on the host. Hence it cannot include kernel header files
directly.

However, now include/linux/kern_levels.h is fairly self-container, perhaps
we should just include that file directly instead of, and get rid of all
DEFINE_STR() users.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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