From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.8]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 055FB186A; Sat, 2 May 2026 20:13:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.8 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777752819; cv=none; b=UKirPit0zpHi5ucdSkxHKgUfqu4pbVxaNUEWd8fH8ojQvFGHpVBvt/WgjHEO4AF2iE/Z08q3wQSh8YIEpqAW7M8kpaJsb87nwKcHjseVmaXLx8ZrmI4y+mcu013PyckIb2NRkzCIxTTtEk/g98Ta+ZIF+voQskmpN8o13By25mk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777752819; c=relaxed/simple; bh=crnjOZylKZIdCsLAiD1K+t/o75AuQmjBAF9uVmJ6/5o=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=UEfuUEMsQGWQKIJ1XuXEL3QyLrUyB4mW/LXwpqIJehL77rSuqQSmbp/zFgVvdNzG2VngS/nsLzbs1TEvwTLIh3V9RZh/v8MGwpyilHCpvdIJv4g3euua1eJGrKgjv+dp6ExrQ9+wRXNbFwujWmrXXBswlDDb6w1wJSGVWYJ4krs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=BlFinHHs; arc=none smtp.client-ip=192.198.163.8 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="BlFinHHs" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1777752817; x=1809288817; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=crnjOZylKZIdCsLAiD1K+t/o75AuQmjBAF9uVmJ6/5o=; b=BlFinHHs31+y4IIx2ZXoFv2XkpIGNBvM8yeXBcJ99PzfrPpsHoH52il6 mm1qx33NrrCCzItyuoJjnwLp3MivFqlf1hYBPaD2z510fQhBKqreggrRg /DFYg8T/YyWS3wag8UUQCR3Zeuhm/eByRw3fhfEU3S+p0ybXgcaWtcqAg jhmpuowhWsg5iK+6m5yTS9xgngOTbxlT6s2Om1V6oAcz7Q1D6FI5+3GRu FwEc21gogVe9WECBvlLD6zKpXe+DRuBhzU8G8Q35dwB1b4h63rlfIwnmF cYauIluhs2VAQ5YzH4uMWqL/6YeCmeWjR5nDJklF285+7yPIzqlVghpQu Q==; X-CSE-ConnectionGUID: r6w7MSs8SiSq9+7auoD5lg== X-CSE-MsgGUID: I5HNCs19QhSDKzzr8DdiBw== X-IronPort-AV: E=McAfee;i="6800,10657,11774"; a="96239380" X-IronPort-AV: E=Sophos;i="6.23,212,1770624000"; d="scan'208";a="96239380" Received: from fmviesa008.fm.intel.com ([10.60.135.148]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 May 2026 13:13:36 -0700 X-CSE-ConnectionGUID: bDay5cGyQi2jtSyfmUdwgw== X-CSE-MsgGUID: nhn0Qm00REmj7f1chsBLpQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.23,212,1770624000"; d="scan'208";a="232503192" Received: from lkp-server01.sh.intel.com (HELO 781826d00641) ([10.239.97.150]) by fmviesa008.fm.intel.com with ESMTP; 02 May 2026 13:13:35 -0700 Received: from kbuild by 781826d00641 with local (Exim 4.98.2) (envelope-from ) id 1wJGiS-000000001mX-41Ps; Sat, 02 May 2026 20:13:32 +0000 Date: Sun, 3 May 2026 04:13:21 +0800 From: kernel test robot To: Dmitry Antipov Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev Subject: Re: [RFC PATCH] net: skb: on zero-copy formatted output to skb Message-ID: <202605030443.Enw1fif1-lkp@intel.com> References: <20260423073638.778334-1-dmantipov@yandex.ru> Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260423073638.778334-1-dmantipov@yandex.ru> Hi Dmitry, [This is a private test report for your RFC patch.] kernel test robot noticed the following build warnings: [auto build test WARNING on net-next/main] [also build test WARNING on net/main linus/master v7.1-rc1 next-20260430] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Dmitry-Antipov/net-skb-on-zero-copy-formatted-output-to-skb/20260425-175341 base: net-next/main patch link: https://lore.kernel.org/r/20260423073638.778334-1-dmantipov%40yandex.ru patch subject: [RFC PATCH] net: skb: on zero-copy formatted output to skb config: sparc64-allmodconfig (https://download.01.org/0day-ci/archive/20260503/202605030443.Enw1fif1-lkp@intel.com/config) compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 5bac06718f502014fade905512f1d26d578a18f3) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260503/202605030443.Enw1fif1-lkp@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-kbuild-all/202605030443.Enw1fif1-lkp@intel.com/ All warnings (new ones prefixed by >>): >> net/core/skbuff.c:7001:56: warning: diagnostic behavior may be improved by adding the 'format(printf, 2, 3)' attribute to the declaration of 'skb_printf' [-Wmissing-format-attribute] 7001 | len = vsnprintf(skb_tail_pointer(skb), size, fmt, args); | ^ include/linux/skbuff.h:4295:5: note: 'skb_printf' declared here 4295 | int skb_printf(struct sk_buff *skb, const char *fmt, ...); | ^ 1 warning generated. vim +7001 net/core/skbuff.c 6994 6995 int skb_printf(struct sk_buff *skb, const char *fmt, ...) 6996 { 6997 int len, size = skb_availroom(skb); 6998 va_list args; 6999 7000 va_start(args, fmt); > 7001 len = vsnprintf(skb_tail_pointer(skb), size, fmt, args); 7002 va_end(args); 7003 7004 if (unlikely(len >= size)) 7005 return -ENOSPC; 7006 7007 skb->tail += len; 7008 skb->len += len; 7009 return len; 7010 } 7011 EXPORT_SYMBOL(skb_printf); 7012 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki