linux-kernel - Re: [PATCH V6] UBI: Extend UBI layer debug/messaging capabilities

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Date:	Tue, 11 Nov 2014 13:25:32 +0100
From:	Richard Weinberger <richard@....at>
To:	dedekind1@...il.com
CC:	Tanya Brokhman <tlinder@...eaurora.org>,
	linux-mtd@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V6] UBI: Extend UBI layer debug/messaging capabilities

Am 11.11.2014 um 13:03 schrieb Artem Bityutskiy:
> On Tue, 2014-11-11 at 09:15 +0100, Richard Weinberger wrote:
>>> Do we really want the function name in every log message?
>>> IMHO this is not wise except for pure debug logs.
>>
>> BTW: Why UBI-X? This looks odd. Either use UBIX or ubiX.
> 
> How about something like this (untested):
> 
> 
> From: Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>
> Date: Tue, 11 Nov 2014 13:56:34 +0200
> Subject: [PATCH] UBI: clean-up printing helpers
> 
> Let's prefix UBI messages with 'ubiX' instead of 'UBI-X' - this is more
> consistent with the way we name UBI devices.
> 
> Also, commit "32608703 UBI: Extend UBI layer debug/messaging capabilities"
> added the function name print to 'ubi_msg()' - lets revert this change, since
> these messages are supposed to be just informative messages, and not debugging
> messages.

What is the benefit of having the function name still in ubi_warn() and ubi_err()?
e.g.
[   95.511825] ubi0 error: ubi_attach_mtd_dev: mtd0 is already attached to ubi0

If the log message is so cryptic that you need to lookup it in the source to understand it,
we better fix the message.

> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>
> ---
>  drivers/mtd/ubi/ubi.h | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h
> index f80ffab..7a92283 100644
> --- a/drivers/mtd/ubi/ubi.h
> +++ b/drivers/mtd/ubi/ubi.h
> @@ -50,13 +50,13 @@
>  #define UBI_NAME_STR "ubi"
>  
>  /* Normal UBI messages */
> -#define ubi_msg(ubi, fmt, ...) pr_notice("UBI-%d: %s:" fmt "\n", \
> -					 ubi->ubi_num, __func__, ##__VA_ARGS__)
> +#define ubi_msg(ubi, fmt, ...) pr_notice("ubi%d: " fmt "\n", \
> +					 ubi->ubi_num, ##__VA_ARGS__)

We could even use UBI_NAME_STR here. :-)

Thanks,
//richard
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