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To:     Rasmus Villemoes <linux@rasmusvillemoes.dk>,
        Juergen Gross <jgross@suse.com>, Petr Mladek <pmladek@suse.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Jani Nikula <jani.nikula@linux.intel.com>,
        Jonathan Corbet <corbet@lwn.net>,
        metux IT consult Enrico Weigelt <lkml@metux.net>,
        linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20190827211244.7210-1-uwe@kleine-koenig.org>
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 kC8vBDJg
Subject: Re: [PATCH v2] vsprintf: introduce %dE for error constants
Message-ID: <002dc2a7-40a3-f52a-c8fa-5dbb42e6dd7b@kleine-koenig.org>
Date:   Thu, 29 Aug 2019 19:39:45 +0200
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From: =?UTF-8?Q?Uwe_Kleine-K=c3=b6nig?= <uwe@kleine-koenig.org>
To: Rasmus Villemoes <linux@rasmusvillemoes.dk>,
 Juergen Gross <jgross@suse.com>, Petr Mladek <pmladek@suse.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
 Steven Rostedt <rostedt@goodmis.org>,
 Andrew Morton <akpm@linux-foundation.org>,
 Jani Nikula <jani.nikula@linux.intel.com>, Jonathan Corbet <corbet@lwn.net>,
 metux IT consult Enrico Weigelt <lkml@metux.net>, linux-doc@vger.kernel.org,
 linux-kernel@vger.kernel.org
Message-ID: <002dc2a7-40a3-f52a-c8fa-5dbb42e6dd7b@kleine-koenig.org>
Subject: Re: [PATCH v2] vsprintf: introduce %dE for error constants
References: <20190827211244.7210-1-uwe@kleine-koenig.org>
 <20190828113216.p2yiha4xyupkbcbs@pathway.suse.cz>
 <74303921-aa95-9962-2254-27e556af54f4@kleine-koenig.org>
 <20190829081249.3zvvsa4ggb5pfozl@pathway.suse.cz>
 <45cd5b50-9854-fce7-5f08-f7660abb8691@suse.com>
 <a83449cf-3a4a-f3e0-210a-dc7c39505355@rasmusvillemoes.dk>
In-Reply-To: <a83449cf-3a4a-f3e0-210a-dc7c39505355@rasmusvillemoes.dk>

--MJLe7gzwVY30ZGetLwRlxf7hE96HGZ1Ol
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On 8/29/19 11:09 AM, Rasmus Villemoes wrote:
> On 29/08/2019 10.27, Juergen Gross wrote:
>> On 29.08.19 10:12, Petr Mladek wrote:
>>> On Wed 2019-08-28 21:18:37, Uwe Kleine-K=C3=B6nig=C2=A0 wrote:
>>>>
>>>> I'd like to postpone the discussion about "how" until we agreed abou=
t
>>>> the "if at all".
>>>
>>> It seems that all people like this feature.
>>
>> Hmm, what about already existing format strings conatining "%dE"?
>>
>> Yes, I could find only one (drivers/staging/speakup/speakup_bns.c), bu=
t
>> nevertheless...
>=20
> Indeed, Uwe still needs to respond to how he wants to handle that. I

This is indeed bad and I didn't expect that. I just took a quick look
and this string is indeed used as sprintf format string.

> still prefer making it %pE, both because it's easier to convert integer=
s
> to ERR_PTRs than having to worry about the type of PTR_ERR() being long=

> and not int, and because alphanumerics after %p have been ignored for a=

> long time (10 years?) whether or not those characters have been
> recognized as a %p extension, so nobody relies on %pE putting an E afte=
r
> the %p output. It also keeps the non-standard extensions in the same
> "namespace", so to speak.
>=20
> Oh, 'E' is taken, well, make it 'e' then.

I like having %pe to print error valued pointers. Then maybe we could
have both %de for ints and %pe for pointers. :-)

Best regards
Uwe


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