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ESMTP id S1727783AbfIPMXp (ORCPT ); Mon, 16 Sep 2019 08:23:45 -0400 Received: from localhost (localhost [127.0.0.1]) by antares.kleine-koenig.org (Postfix) with ESMTP id C47217B4C12; Mon, 16 Sep 2019 14:23:40 +0200 (CEST) Received: from antares.kleine-koenig.org ([127.0.0.1]) by localhost (antares.kleine-koenig.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id T-hIUm7TTi-n; Mon, 16 Sep 2019 14:23:38 +0200 (CEST) Received: from [IPv6:2a02:8071:b5c2:53f8:3192:99d7:1d59:986] (unknown [IPv6:2a02:8071:b5c2:53f8:3192:99d7:1d59:986]) by antares.kleine-koenig.org (Postfix) with ESMTPSA; Mon, 16 Sep 2019 14:23:38 +0200 (CEST) To: Rasmus Villemoes , Andrew Morton , Jonathan Corbet Cc: Andy Shevchenko , Joe Perches , Petr Mladek , Sergey Senozhatsky , Jani Nikula , Linux Kernel Mailing List , linux-doc@vger.kernel.org References: <20190830214655.6625-1-linux@rasmusvillemoes.dk> <20190909203826.22263-1-linux@rasmusvillemoes.dk> From: =?UTF-8?Q?Uwe_Kleine-K=c3=b6nig?= Openpgp: 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KCWhO720RZF6HSmwQqfJza+Z4zN7NGtnDTX9su0ufQkwr34dsy76CDEqNQARAQABiQIlBBgB CgAPBQJUsuKVAhsMBQkJZgGAAAoJEOLc3ZEyZpvWuOQQAJSvLehOMf21aC2RPVhWmCFibOnR qRM4iGypKEERWxagNwjqx8YrL+dsu7o/aWwjG1CvfaHDFQ78CBj/xBGw8XheODpvS3Z/ERGv NivQ8HK0MWIIQZ85U5gj1h0Ls0LBeRkTOPRe6jUmjyzeWnMa/5wXaXsxZKE2n49ai5m+gL9/ 3sBXsBCsWxhVqn+lq7c5GEhxGJHvCDX5TcXdOC63Mcek4hKRbSYGkj1QYJV/WF9cLwvU3XI8 nrGDGX8IWaJr6GxTWCeYs5uWU70cg2TRKHM4SCveZyeizz4YRXYjvZTIent6TUKmxdMLBAC2 gI3H+75QRrflG5po1F+Uhbmd5BHLcAgvMUc58YaXYCwI6fY1/Q9zIpM1CHUPe4lZN5XUIA4S VBYi6Yvx82qA97KZfHsyvLwR56NMl/1b5dbQwl6eoM/JH4GgXDEh0NmPdE/MnQM7svxsB7xp 8kNRLpvtXNxp6SZUcf7u6vIwvlcrYMeDIaxf4dZSAuFwurOQtVP0gERKFSh1oMI+I0wXeMbO pN3/t3AK3zD7ZykqMstza/jYFEK1gNj7UhnvazBhMaMhCEt8rNqr5/dbgvAD/biSZO6wZrn7 hCaye/ulWpSqZSdx+G9GkTn05lsuHu9zfTwY6B0A6nlrqQSR/yWPvSq1Ud6IOZY1alq7ZSag kC8vBDJg Subject: Re: [PATCH v2] printf: add support for printing symbolic error codes Message-ID: <33592303-091c-c480-460f-e2acd89e99be@kleine-koenig.org> Date: Mon, 16 Sep 2019 14:23:34 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20190909203826.22263-1-linux@rasmusvillemoes.dk> Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="TQcAlw0Wou5pUtr3mRmPeP2NWKWcKrlDp" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --TQcAlw0Wou5pUtr3mRmPeP2NWKWcKrlDp Content-Type: multipart/mixed; boundary="B0CQD4VNcAoxu94WxzKYlvww5fCZhKeot"; protected-headers="v1" From: =?UTF-8?Q?Uwe_Kleine-K=c3=b6nig?= To: Rasmus Villemoes , Andrew Morton , Jonathan Corbet Cc: Andy Shevchenko , Joe Perches , Petr Mladek , Sergey Senozhatsky , Jani Nikula , Linux Kernel Mailing List , linux-doc@vger.kernel.org Message-ID: <33592303-091c-c480-460f-e2acd89e99be@kleine-koenig.org> Subject: Re: [PATCH v2] printf: add support for printing symbolic error codes References: <20190830214655.6625-1-linux@rasmusvillemoes.dk> <20190909203826.22263-1-linux@rasmusvillemoes.dk> In-Reply-To: <20190909203826.22263-1-linux@rasmusvillemoes.dk> --B0CQD4VNcAoxu94WxzKYlvww5fCZhKeot Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable Hello Rasmus, On 9/9/19 10:38 PM, Rasmus Villemoes wrote: > It has been suggested several times to extend vsnprintf() to be able > to convert the numeric value of ENOSPC to print "ENOSPC". This is yet > another attempt. Rather than adding another %p extension, simply teach > plain %p to convert ERR_PTRs. While the primary use case is >=20 > if (IS_ERR(foo)) { > pr_err("Sorry, can't do that: %p\n", foo); > return PTR_ERR(foo); > } >=20 > it is also more helpful to get a symbolic error code (or, worst case, > a decimal number) in case an ERR_PTR is accidentally passed to some > %p, rather than the (efault) that check_pointer() would > result in. >=20 > With my embedded hat on, I've made it possible to remove this. >=20 > I've tested that the #ifdeffery in errcode.c is sufficient to make > this compile on arm, arm64, mips, powerpc, s390, x86 - I'm sure the > 0day bot will tell me which ones I've missed. >=20 > The symbols to include have been found by massaging the output of >=20 > find arch include -iname 'errno*.h' | xargs grep -E 'define\s*E' >=20 > In the cases where some common aliasing exists > (e.g. EAGAIN=3DEWOULDBLOCK on all platforms, EDEADLOCK=3DEDEADLK on mos= t), > I've moved the more popular one (in terms of 'git grep -w Efoo | wc) > to the bottom so that one takes precedence. >=20 > Acked-by: Uwe Kleine-K=C3=B6nig > Signed-off-by: Rasmus Villemoes Even with my ack already given I still think having %pE (or %pe) for ints holding an error code is sensible. So I wonder if it would be a good idea to split this patch into one that introduces errcode() and then the patch that teaches vsprintf about emitting its return value for error valued pointers. Then I could rebase my initial patch for %pe on top of your first one. Other than that I wonder how we can go forward from here. So I think it is time for v3 which picks up the few suggestions. Best regards Uwe --B0CQD4VNcAoxu94WxzKYlvww5fCZhKeot-- --TQcAlw0Wou5pUtr3mRmPeP2NWKWcKrlDp Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCgAdFiEEfnIqFpAYrP8+dKQLwfwUeK3K7AkFAl1/fsYACgkQwfwUeK3K 7AnBdQf/SCcetC9S0bW0L2+g/Uy++g+QQ3g1vPF6VisIySs/2hSgye3huiEtlwt+ 7NXBvC1MeTInkqu2NyRUgikTutVG+SDqUg3T1tKwIx7mhJm9Shawsah5QNQn2sNK 4XP22jFnUO9jzbFXcxrDunG/0ZUy2e85GmRuKsh8FNVlJE4i0yKmOhHY3yg3CeVi GQPfvUSGuH9Iu7HQaLVFHGMlDUDV8ovyOEXrjR8sdrbRFHW2u8+CxlUdl6N4lxX0 ptBFpORF5I21e0FMeI3hWMj1qik1yw6jJCDJ/u+Y4zyt9PEY4JNySk0sEWz6k9Nx 5XaUqtsy2vbArWXC9PwEjKFmca9p1g== =Xnhb -----END PGP SIGNATURE----- --TQcAlw0Wou5pUtr3mRmPeP2NWKWcKrlDp--