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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E96A3E8784E for ; Tue, 3 Feb 2026 17:17:54 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 206B16B00A8; Tue, 3 Feb 2026 12:17:54 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 1DDA46B00AA; Tue, 3 Feb 2026 12:17:54 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0DE0C6B00AB; Tue, 3 Feb 2026 12:17:54 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id F12296B00A8 for ; Tue, 3 Feb 2026 12:17:53 -0500 (EST) Received: from smtpin13.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id 8339216032C for ; Tue, 3 Feb 2026 17:17:53 +0000 (UTC) X-FDA: 84403802826.13.8ECE327 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.21]) by imf21.hostedemail.com (Postfix) with ESMTP id 0989D1C0011 for ; Tue, 3 Feb 2026 17:17:50 +0000 (UTC) Authentication-Results: imf21.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=gesjHoji; dmarc=pass (policy=none) header.from=intel.com; spf=pass (imf21.hostedemail.com: domain of andriy.shevchenko@linux.intel.com designates 198.175.65.21 as permitted sender) smtp.mailfrom=andriy.shevchenko@linux.intel.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1770139071; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=NS0E6bgKyqTLFJJmkBS+9m2uVKsOfGKpeowXk4rUFgs=; b=7YYA6UGYhf/A96swf7kT1Jr7d+VO5hDe+SkNnCZ0sggEJ9w7t7huQtPMJKoPtSdIpDaZO7 n657bve8lDBdG/RdYzqUQrhOb3QALKOkr6L6rj1QeZmG8j/SgDFW4sZffInkNBAno37851 Co4UQjvf4IzqNV2QwvoRvpMK613MTTk= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1770139071; a=rsa-sha256; cv=none; b=CmG9jfXPX3LEN7n7EJ+5s711Q4iYAQKGD9Ked+8s7Gy5AGMC16Xe+v3bmWEVhjZBdh+WN7 ZRFTPg2adhwx8cq13ZJddf6C/KXA3arCpLHNk7EoeNGD6Fvf6vErG5of+T9YHB9ihYuWTp gWZ5d1DtqAqiO+n3z0AmrKtDszlUHU4= ARC-Authentication-Results: i=1; imf21.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=gesjHoji; dmarc=pass (policy=none) header.from=intel.com; spf=pass (imf21.hostedemail.com: domain of andriy.shevchenko@linux.intel.com designates 198.175.65.21 as permitted sender) smtp.mailfrom=andriy.shevchenko@linux.intel.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1770139071; x=1801675071; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=v0lDm9YgstKw6NIqXo1gHAVbHj1ebjoVADNi9DqILIA=; b=gesjHojijbZWQeZak5LT1E6TZIMNchNGFlOlACAnxxGgqDu0YFfX6VuW WLwKrdjChxHaQKjH6i8ToCC9G3MFGQqoSKelVn7gwPKSSvGd+5WMIdXk7 DRMhazmP3HkqGTlVECo6VE4BqCsnxIQkVS0CQFf5JWC2JVN0OTKCCZBGl HH+vDie9lM1cuKvZXLl1DJREppjxXIPdSRcVv/tVmlhv9l4+Hb1RyAzgH 7/v6b/K5e5/Kk79TaRFEabi7AHE8q5ZMtRYnVHamw+Mw0Myr22tBCwZ1L qPmJte8Uy8DSxC5BsvWOANjwLAHc4s45Qa0EJtXJ47QpUiR+zSexLBZys g==; X-CSE-ConnectionGUID: I0eegEHOSPKoyGe0bOSvWA== X-CSE-MsgGUID: VQ32HcUvR66j83c94JHZdQ== X-IronPort-AV: E=McAfee;i="6800,10657,11691"; a="71221773" X-IronPort-AV: E=Sophos;i="6.21,271,1763452800"; d="scan'208";a="71221773" Received: from orviesa002.jf.intel.com ([10.64.159.142]) by orvoesa113.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Feb 2026 09:17:48 -0800 X-CSE-ConnectionGUID: eFiBkPDwTYek2C7bzla/Yg== X-CSE-MsgGUID: ifUYzvaAT5KqOvbUgYsovw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,271,1763452800"; d="scan'208";a="240590627" Received: from pgcooper-mobl3.ger.corp.intel.com (HELO localhost) ([10.245.245.99]) by orviesa002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Feb 2026 09:17:44 -0800 Date: Tue, 3 Feb 2026 19:17:41 +0200 From: Andy Shevchenko To: Arnd Bergmann Cc: kernel test robot , Arnd Bergmann , Steven Rostedt , Masami Hiramatsu , Simon Horman , Jeff Layton , Anna Schumaker , Chuck Lever , llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev, Mathieu Desnoyers , Andrew Morton , Linux Memory Management List , Randy Dunlap , Yury Norov , Joel Fernandes , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: Re: [PATCH] tracing: remove __printf() attribute on __ftrace_vbprintk() Message-ID: References: <20260202095834.1328352-1-arnd@kernel.org> <202602032036.FQK7gJvV-lkp@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Organization: Intel Finland Oy - BIC 0357606-4 - c/o Alberga Business Park, 6 krs, Bertel Jungin Aukio 5, 02600 Espoo X-Rspamd-Queue-Id: 0989D1C0011 X-Stat-Signature: a5owftbiz8euohqhu5akmt7bq91dcpuk X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1770139070-182525 X-HE-Meta: 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 llvjGb5O isYW+XIv3GZidXqUeVV55BgzayybOBaT2y+ZVUix50+izVAMLsR2tsNowLkgF5IKBsyOfBG8FRDhO4A1fSxUylRHj5yzCB3xA/lv91pAo1usSSq3cGd1ze+Wu5depYerFxeB/Nfb51YKus6N9sgzNq6NS8PDdAfBMREDgv9Boeu1H2VeK6gIqhcbLvhtjb/gfeW5BQazQzb3PLpPmAPgrZd2CErb5gW7Xm2t/BxlG0/NZzP35XNdzVpIPw2DEM/0X+r9zBZc8uAkY4ZEcDjQ3AhGQVakjTzeSZtMh5aKOYk37GUr0/chTAkTtZ733rp98gYDdyXPKngQrjQK853L+c+z/gbS75EdwePd5/s/U8LPwwcNQ5FK8Z6cRyjEVFQIwyllXT/u4/soOiiM7Hu8lm1hWvUEBhK6BXjrna4qrFcwfGFA= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Feb 03, 2026 at 04:56:03PM +0100, Arnd Bergmann wrote: > On Tue, Feb 3, 2026, at 15:58, Andy Shevchenko wrote: > > On Tue, Feb 03, 2026 at 08:12:57PM +0800, kernel test robot wrote: > > > >> kernel test robot noticed the following build warnings: > > > > Yeah, you need to go for the full stack of these calls and mark the > > bottom one with __diag() to avoid these warnings. That's my understanding > > and what BPF people required. Chasing this one-by-one would produce > > unneeded churn. > > From what I can tell, I can just move the printf attribute > to the __ftrace_vbprintk() definition to make this bit work. Ah, that's cool! ... > There are unrelated warnings for BPF that I managed to > shut up the same way, doing BPF rejected such an approach, see lore discussions in the past (patches from me). Here some pointers (but not all of them): 20251208141618.2805983-1-andriy.shevchenko@linux.intel.com 202512090407.VxRO6xAS-lkp@intel.com 20251210131234.3185985-1-andriy.shevchenko@linux.intel.com 20251216122514.7ee70d5f@canb.auug.org.au 20251215202430.c35c2d29c4f9ff614d2ab534@linux-foundation.org -- With Best Regards, Andy Shevchenko