From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.10]) (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 DD0B212C54D for ; Sun, 13 Oct 2024 09:55:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.10 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728813350; cv=none; b=OH+Eea1PBo2h8KLgpluEU4GaC/B3U8Q85mNg7fLvKsr7t1ZAHFK8J92jRwucCD9Ma+kWU6jzd8P/cN/57Z9yTni+lL2EK8AJ6Q7b1dCyiCl2hxo6vVjsmQJsGIcDHA7my6Y3DwFxBvmnbjOqh/GpTk/Z1zOyINBTmP/an5JGPyc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728813350; c=relaxed/simple; bh=YHPZ9HiYk7Nmr2TKI3svodLUHbz2SvWcrN7V2Xi/ln8=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=LjkDUDVQ+THH6f3KLJZPvV286LOQKqFMYHExyhLQkYFFvXl9zNTSo1h13nLA1F0SpRY4YACbPX6YH4nVU9hmgVMU4Yq/VPX6JqEhE440+AdbM5g3SMeF/+aBjQeGshFcR74qREERhUxbkp9Lfxvu+dyiYDY+rfGOk3iLpLkistg= 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=ikUsBYN7; arc=none smtp.client-ip=198.175.65.10 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="ikUsBYN7" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1728813349; x=1760349349; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=YHPZ9HiYk7Nmr2TKI3svodLUHbz2SvWcrN7V2Xi/ln8=; b=ikUsBYN7fjDc5gt6+ZbEWE0rbqQk7Hd+7JRPoL00Nj58bbNgULKTGrxz hBcLhSjsR48r7kCoLha8xjqbVWmas0tOb8VgWtQYSk+cbWS9vrwfB9hsR XFHGXRnK6a+jS0NydA55D7ji0yu40SrL0O0Ik9WONoHoAtXrwL+wpZKEG JfFB0P0NwgZQ2Pxr3rPTExF3AltGbLfLMdh9nRGj/zECNsxmquziKWH+x EUL9TPE9p0l2lv/kI3AFcJysOg72A9uvQZ70kFrSShuUfRh8vZCQ9+FcF VhPTzZ5J7Rase9q+F5EQXSP0EoUG3JrDAPwHh+99Zld00eocGeXi6XiFO g==; X-CSE-ConnectionGUID: p6yMxEfmQv+OFA9VlWFMIw== X-CSE-MsgGUID: okX6Q+1LS6aA/0v2Y5s7kA== X-IronPort-AV: E=McAfee;i="6700,10204,11222"; a="45646581" X-IronPort-AV: E=Sophos;i="6.11,199,1725346800"; d="scan'208";a="45646581" Received: from fmviesa001.fm.intel.com ([10.60.135.141]) by orvoesa102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Oct 2024 02:55:47 -0700 X-CSE-ConnectionGUID: 5QuhQ/mXQVaASKUyPZhk6Q== X-CSE-MsgGUID: lRhOdtMGSBKWB5HRI+PRKg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.11,200,1725346800"; d="scan'208";a="108051969" Received: from lkp-server01.sh.intel.com (HELO a48cf1aa22e8) ([10.239.97.150]) by fmviesa001.fm.intel.com with ESMTP; 13 Oct 2024 02:55:42 -0700 Received: from kbuild by a48cf1aa22e8 with local (Exim 4.96) (envelope-from ) id 1szvK8-000EGp-1L; Sun, 13 Oct 2024 09:55:40 +0000 Date: Sun, 13 Oct 2024 17:54:43 +0800 From: kernel test robot To: Ankur Arora , linux-kernel@vger.kernel.org Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev, peterz@infradead.org, tglx@linutronix.de, paulmck@kernel.org, mingo@kernel.org, bigeasy@linutronix.de, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, frederic@kernel.org, ankur.a.arora@oracle.com, efault@gmx.de Subject: Re: [PATCH 1/7] sched: warn for high latency with TIF_NEED_RESCHED_LAZY Message-ID: <202410131726.Gi9qvUP8-lkp@intel.com> References: <20241009165411.3426937-2-ankur.a.arora@oracle.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20241009165411.3426937-2-ankur.a.arora@oracle.com> Hi Ankur, kernel test robot noticed the following build errors: [auto build test ERROR on paulmck-rcu/dev] [also build test ERROR on powerpc/next powerpc/fixes tip/sched/core linus/master v6.12-rc2 next-20241011] [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/Ankur-Arora/sched-warn-for-high-latency-with-TIF_NEED_RESCHED_LAZY/20241010-005819 base: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev patch link: https://lore.kernel.org/r/20241009165411.3426937-2-ankur.a.arora%40oracle.com patch subject: [PATCH 1/7] sched: warn for high latency with TIF_NEED_RESCHED_LAZY config: x86_64-kexec (https://download.01.org/0day-ci/archive/20241013/202410131726.Gi9qvUP8-lkp@intel.com/config) compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241013/202410131726.Gi9qvUP8-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/202410131726.Gi9qvUP8-lkp@intel.com/ All errors (new ones prefixed by >>): >> kernel/sched/core.c:5528:27: error: call to undeclared function 'tif_need_resched_lazy'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] 5528 | if ((!need_resched() && !tif_need_resched_lazy()) || !latency_warn_ms) | ^ kernel/sched/core.c:5528:27: note: did you mean 'tif_need_resched'? include/linux/thread_info.h:182:29: note: 'tif_need_resched' declared here 182 | static __always_inline bool tif_need_resched(void) | ^ 1 error generated. vim +/tif_need_resched_lazy +5528 kernel/sched/core.c 5517 5518 #ifdef CONFIG_SCHED_DEBUG 5519 static u64 cpu_resched_latency(struct rq *rq) 5520 { 5521 int latency_warn_ms = READ_ONCE(sysctl_resched_latency_warn_ms); 5522 u64 resched_latency, now = rq_clock(rq); 5523 static bool warned_once; 5524 5525 if (sysctl_resched_latency_warn_once && warned_once) 5526 return 0; 5527 > 5528 if ((!need_resched() && !tif_need_resched_lazy()) || !latency_warn_ms) 5529 return 0; 5530 5531 if (system_state == SYSTEM_BOOTING) 5532 return 0; 5533 5534 if (!rq->last_seen_need_resched_ns) { 5535 rq->last_seen_need_resched_ns = now; 5536 rq->ticks_without_resched = 0; 5537 return 0; 5538 } 5539 5540 rq->ticks_without_resched++; 5541 resched_latency = now - rq->last_seen_need_resched_ns; 5542 if (resched_latency <= latency_warn_ms * NSEC_PER_MSEC) 5543 return 0; 5544 5545 warned_once = true; 5546 5547 return resched_latency; 5548 } 5549 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki