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[209.132.180.67]) by mx.google.com with ESMTP id s73si21683693pfs.54.2018.12.06.01.24.27; Thu, 06 Dec 2018 01:24:43 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729321AbeLFJX1 (ORCPT + 99 others); Thu, 6 Dec 2018 04:23:27 -0500 Received: from mail.netline.ch ([148.251.143.178]:55401 "EHLO netline-mail3.netline.ch" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727783AbeLFJX0 (ORCPT ); Thu, 6 Dec 2018 04:23:26 -0500 Received: from localhost (localhost [127.0.0.1]) by netline-mail3.netline.ch (Postfix) with ESMTP id BFB372A604C; Thu, 6 Dec 2018 10:23:23 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at netline-mail3.netline.ch Received: from netline-mail3.netline.ch ([127.0.0.1]) by localhost (netline-mail3.netline.ch [127.0.0.1]) (amavisd-new, port 10024) with LMTP id F3B5h78J3AzK; Thu, 6 Dec 2018 10:23:19 +0100 (CET) Received: from thor (39.1.199.178.dynamic.wline.res.cust.swisscom.ch [178.199.1.39]) by netline-mail3.netline.ch (Postfix) with ESMTPSA id 538792A604B; Thu, 6 Dec 2018 10:23:19 +0100 (CET) Received: from localhost ([::1]) by thor with esmtp (Exim 4.91) (envelope-from ) id 1gUpsN-0003es-2A; Thu, 06 Dec 2018 10:23:19 +0100 Subject: Re: [PATCH 1/2] drm: Only #define DEBUG if CONFIG_DYNAMIC_DEBUG is disabled To: Joe Perches , "Zhang, Jerry(Junwei)" , Christian Koenig , Huang Rui , Maarten Lankhorst , Maxime Ripard , Sean Paul , David Airlie , Chris Wilson Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org References: <20181205165621.5805-1-michel@daenzer.net> <10fca21a-5d7c-fe9e-07f0-6200e9de538e@amd.com> <1586a49594d30b4bf4d88eba0d258e21efd26da2.camel@perches.com> From: =?UTF-8?Q?Michel_D=c3=a4nzer?= Openpgp: preference=signencrypt Autocrypt: addr=michel@daenzer.net; prefer-encrypt=mutual; keydata= mQGiBDsehS8RBACbsIQEX31aYSIuEKxEnEX82ezMR8z3LG8ktv1KjyNErUX9Pt7AUC7W3W0b LUhu8Le8S2va6hi7GfSAifl0ih3k6Bv1Itzgnd+7ZmSrvCN8yGJaHNQfAevAuEboIb+MaVHo 9EMJj4ikOcRZCmQWw7evu/D9uQdtkCnRY9iJiAGxbwCguBHtpoGMxDOINCr5UU6qt+m4O+UD /355ohBBzzyh49lTj0kTFKr0Ozd20G2FbcqHgfFL1dc1MPyigej2gLga2osu2QY0ObvAGkOu WBi3LTY8Zs8uqFGDC4ZAwMPoFy3yzu3ne6T7d/68rJil0QcdQjzzHi6ekqHuhst4a+/+D23h Za8MJBEcdOhRhsaDVGAJSFEQB1qLBACOs0xN+XblejO35gsDSVVk8s+FUUw3TSWJBfZa3Imp V2U2tBO4qck+wqbHNfdnU/crrsHahjzBjvk8Up7VoY8oT+z03sal2vXEonS279xN2B92Tttr AgwosujguFO/7tvzymWC76rDEwue8TsADE11ErjwaBTs8ZXfnN/uAANgPLQjTWljaGVsIERh ZW56ZXIgPG1pY2hlbEBkYWVuemVyLm5ldD6IXgQTEQIAHgUCQFXxJgIbAwYLCQgHAwIDFQID AxYCAQIeAQIXgAAKCRBaga+OatuyAIrPAJ9ykonXI3oQcX83N2qzCEStLNW47gCeLWm/QiPY jqtGUnnSbyuTQfIySkK5AQ0EOx6FRRAEAJZkcvklPwJCgNiw37p0GShKmFGGqf/a3xZZEpjI qNxzshFRFneZze4f5LhzbX1/vIm5+ZXsEWympJfZzyCmYPw86QcFxyZflkAxHx9LeD+89Elx bw6wT0CcLvSv8ROfU1m8YhGbV6g2zWyLD0/naQGVb8e4FhVKGNY2EEbHgFBrAAMGA/0VktFO CxFBdzLQ17RCTwCJ3xpyP4qsLJH0yCoA26rH2zE2RzByhrTFTYZzbFEid3ddGiHOBEL+bO+2 GNtfiYKmbTkj1tMZJ8L6huKONaVrASFzLvZa2dlc2zja9ZSksKmge5BOTKWgbyepEc5qxSju YsYrX5xfLgTZC5abhhztpYhGBBgRAgAGBQI7HoVFAAoJEFqBr45q27IAlscAn2Ufk2d6/3p4 Cuyz/NX7KpL2dQ8WAJ9UD5JEakhfofed8PSqOM7jOO3LCA== Message-ID: <276fbf7f-d33f-83a5-cb88-bd4051dc03ba@daenzer.net> Date: Thu, 6 Dec 2018 10:23:18 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.1 MIME-Version: 1.0 In-Reply-To: <1586a49594d30b4bf4d88eba0d258e21efd26da2.camel@perches.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-CA Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2018-12-06 3:51 a.m., Joe Perches wrote: > On Thu, 2018-12-06 at 10:40 +0800, Zhang, Jerry(Junwei) wrote: >> On 12/6/18 12:56 AM, Michel Dänzer wrote: >>> From: Michel Dänzer >>> >>> The following cases are possible for pr_debug(): >>> >>> 1. CONFIG_DYNAMIC_DEBUG disabled >>> a) DEBUG not defined: pr_debug() translates to no_printk(...), i.e. >>> it never generates any output. >>> b) DEBUG defined: pr_debug() translates to printk(KERN_DEBUG ...), >>> i.e. it generates output which doesn't appear in dmesg by default, >>> can be enabled dynamically. >>> >>> 2. CONFIG_DYNAMIC_DEBUG enabled: pr_debug() translates to >>> dynamic_pr_debug() >>> a) DEBUG not defined: dynamic_pr_debug() generates no output by >>> default, can be enabled dynamically. >>> b) DEBUG defined: dynamic_pr_debug() generates output by default, >>> can be disabled dynamically. >>> >>> The intention for drm_debug_printer() is to generate output which >>> doesn't appear in dmesg by default, but can be enabled dynamically, i.e. >>> cases 1b) and 2a). However, defining DEBUG unconditionally gave us 2b) >>> instead of 2a) with CONFIG_DYNAMIC_DEBUG enabled. >>> >>> Fixes: 79a5ad2fdb3c ("drm: Enable pr_debug() for drm_printer") > > I very much doubt this is a fix. > > Did you read the commit log for this commit? > > It says "make sure it will always produce output" I thought the commit log covered this, suggestions for improvement welcome. Chris' change addressed case 1a), but also took us from 2a) to 2b). But we want 2a). I suspect Chris missed that pr_debug()'s output is visible by default if CONFIG_DYNAMIC_DEBUG and DEBUG are both defined. > And why didn't you cc Chris Wilson, the author of that patch? I used the get_maintainer.pl script. Thanks for adding Chris. P.S. FYI, your e-mail had a very aggressive tone to me, not sure what for. >>> Signed-off-by: Michel Dänzer >> Reviewed-by: Junwei Zhang >> >>> --- >>> drivers/gpu/drm/drm_print.c | 6 ++++-- >>> 1 file changed, 4 insertions(+), 2 deletions(-) >>> >>> diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c >>> index 0e7fc3e7dfb4..ee56e4a1b343 100644 >>> --- a/drivers/gpu/drm/drm_print.c >>> +++ b/drivers/gpu/drm/drm_print.c >>> @@ -23,11 +23,13 @@ >>> * Rob Clark >>> */ >>> >>> -#define DEBUG /* for pr_debug() */ >>> - >>> #include >>> #include >>> #include >>> + >>> +#ifndef CONFIG_DYNAMIC_DEBUG >>> +#define DEBUG /* for pr_debug() */ >>> +#endif >>> #include >>> >>> void __drm_puts_coredump(struct drm_printer *p, const char *str) > > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel > -- Earthling Michel Dänzer | http://www.amd.com Libre software enthusiast | Mesa and X developer