From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E3F60C3A59E for ; Mon, 2 Sep 2019 15:30:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id ABDD321881 for ; Mon, 2 Sep 2019 15:30:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725999AbfIBPaF (ORCPT ); Mon, 2 Sep 2019 11:30:05 -0400 Received: from antares.kleine-koenig.org ([94.130.110.236]:58484 "EHLO antares.kleine-koenig.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with 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Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <20190830214655.6625-1-linux@rasmusvillemoes.dk> Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="lyMxWj5YLMl1ehhfIWZVH3fGDLILKdhuZ" 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) --lyMxWj5YLMl1ehhfIWZVH3fGDLILKdhuZ Content-Type: multipart/mixed; boundary="75mDmNoyi7OSiABt3vmPiv5DkweSYDggR"; protected-headers="v1" From: =?UTF-8?Q?Uwe_Kleine-K=c3=b6nig?= To: Rasmus Villemoes , Sergey Senozhatsky , Petr Mladek Cc: Andrew Morton , Jani Nikula , Joe Perches , Juergen Gross , linux-kernel@vger.kernel.org Message-ID: <7f744f43-3928-65a8-290b-ad1a45320210@kleine-koenig.org> Subject: Re: [PATCH] printf: add support for printing symbolic error codes References: <20190830214655.6625-1-linux@rasmusvillemoes.dk> In-Reply-To: <20190830214655.6625-1-linux@rasmusvillemoes.dk> --75mDmNoyi7OSiABt3vmPiv5DkweSYDggR Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable Hello Rasmus, On 8/30/19 11:46 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); > } > > 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. Your text suggests that only cases that formerly emitted "(efault)" are affected. I didn't check this but if this is the case, I like your patch.= > With my embedded hat on, I've made it possible to remove this. I wonder if the config item should only be configurable if EXPERT is enabled. > 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 > Signed-off-by: Rasmus Villemoes Apart from the above minor issues: Acked-by: Uwe Kleine-K=C3=B6nig Best regards Uwe --75mDmNoyi7OSiABt3vmPiv5DkweSYDggR-- --lyMxWj5YLMl1ehhfIWZVH3fGDLILKdhuZ Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCgAdFiEEfnIqFpAYrP8+dKQLwfwUeK3K7AkFAl1tNXMACgkQwfwUeK3K 7AkM5Qf/Y+ZcfLOHpRwOgK6BWvtForzv50pG6t6XRcV/pO+iiwWqgaQwKUmfZ/jz Kp3grPXCjFEjD8XQramsD8KEqsjhCTpyA/438mncIe4Ga0aRwH24hXAky9Orz+vG 9YPNbs57QkuoR2fPvKFjGLL7vGXYiPQ7yVuUCdoadbGiPSNI31oSqMqpRbVEduLJ vAETINvV9+NM9ng0mcZAaBatnUtoZVpGdD1xX4Q4p6fxDxUuw8pv+YdSUDt/V8fu u2SeuEds+ZtamJc926GtOTB9BHF1GD3klDb/Qup6O2HyIrlLFCCGck8hg1fsKPvq hifHAo6ocwpTh6+G4EX28K19WskTkw== =DQ45 -----END PGP SIGNATURE----- --lyMxWj5YLMl1ehhfIWZVH3fGDLILKdhuZ--