linux-kernel - Re: [PATCH v2] vsprintf: introduce %dE for error constants

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Message-ID: <59bfcf90-f7f8-4d55-b5bf-211f6ca67917@kleine-koenig.org>
Date:   Tue, 27 Aug 2019 23:35:55 +0200
From:   Uwe Kleine-König <uwe@...ine-koenig.org>
To:     Joe Perches <joe@...ches.com>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Enrico Weigelt, metux IT consult" <lkml@...ux.net>
Cc:     Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] vsprintf: introduce %dE for error constants

Hello Joe,

On 8/27/19 11:22 PM, Joe Perches wrote:
> On Tue, 2019-08-27 at 23:12 +0200, Uwe Kleine-König wrote:
>> The new format specifier %dE introduced with this patch pretty-prints
>> the typical negative error values. So
>>
>> 	pr_info("probing failed (%dE)\n", ret);
>>
>> yields
>>
>> 	probing failed (EIO)
>>
>> if ret holds -EIO. This is easier to understand than the for now common
>>
>> 	probing failed (-5)
> 
> I suggest using both outputs like '-5 -EIO'
> rather than a single string

I like it the way it is implemented as it is more flexible. If you want
to see both, you can still do

	pr_info("probing failed (%d %dE)\n", ret, ret);

and people (like me) who think that giving only EIO can still do just that.

Best regards
Uwe



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