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=-13.3 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_IN_DEF_DKIM_WL 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 9F6C7C433E0 for ; Mon, 15 Jun 2020 17:54:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 72D6E206D7 for ; Mon, 15 Jun 2020 17:54:59 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="BXZKUDKZ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731231AbgFORy6 (ORCPT ); Mon, 15 Jun 2020 13:54:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41590 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728585AbgFORy5 (ORCPT ); Mon, 15 Jun 2020 13:54:57 -0400 Received: from mail-yb1-xb43.google.com (mail-yb1-xb43.google.com [IPv6:2607:f8b0:4864:20::b43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7F48EC061A0E for ; Mon, 15 Jun 2020 10:54:57 -0700 (PDT) Received: by mail-yb1-xb43.google.com with SMTP id 187so9442639ybq.2 for ; Mon, 15 Jun 2020 10:54:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=Dk7BygnFYGnzkx1IWPE/dcxGzhkldsM5n8DQWmVEnpQ=; b=BXZKUDKZ+FdY1u9DiY8vCq4SXoTi/jPf87ajorWN7GgJBESLuSwhHVibfq0ePdJWNC wWbFZzC8SPgu6ear8yczsNS+7nDL0eRUstfQGLsM2N4RiI4qX57blIAOu81O9uSFG04U N9mVWQ4hJFsaPcvlV6hYlgqlqb+qzCaM1Ga0q10zhVGIob9ZuPUsmpC17uaP3iiVWNtc YtCn13RejSqAIr2HC8la9IDCTfoN4ZwXWV0vJ7XCIPq/xdUNRDz0U8q+95K5rawD2gQy LPUtutgbjQ1PHWsWmrUWvEX7ZCDiCI3VRKNfJDQxQKsPfzoRQL6Q5/Lp9kUWmYBZ2J4c kQCA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=Dk7BygnFYGnzkx1IWPE/dcxGzhkldsM5n8DQWmVEnpQ=; b=JSheLhE77pAet9RAPKBRH7QVZs/4saZgOmFbfMvAmHuAV/q0TimfUVxk78EXEzF2Zp Thn05nFJjI90WNaZn2xWFz4mbGJAhZ+bnUukFbfpLiK1Scx3Q7+VCoM5BGRvGZ0giF4G l378Jy+tQO0LNplSsc6kLHUgV0+0rAYVtHFDV+vF/DVKvwuWnxpujerT7aQvpC34Dwcq cPnzOrdg7IV/z947ZLX9MrfOd8TbkdRjNjShU8eqeqYlDEqorbmut3BHTyeF0pxz5pft pEuX7320R0M+CKC5/G99N90E5dVC3x8lPvY3HzTNb2voqSS3Z64/BWD83rfDtLtfrUnh S93g== X-Gm-Message-State: AOAM531byEci5aw5S+3hRqtccAhyPmXHWHMWBnDw4e5BgI2n+3+faEJn g3N5ny0XaQr+tc1JSialnQjaUhPVeu5sL/OiHiVxMw== X-Google-Smtp-Source: ABdhPJxD3gXDRu/pSIAsFwvwh2W7/wJ4rMNdhjPfQri1swBGjCuO+BcaMIBnpIe6X6t1v7QPoJvWZosfnadSmDnYqIo= X-Received: by 2002:a25:941:: with SMTP id u1mr48736662ybm.274.1592243696339; Mon, 15 Jun 2020 10:54:56 -0700 (PDT) MIME-Version: 1.0 References: <20200615062520.GK12456@shao2-debian> In-Reply-To: From: Eric Dumazet Date: Mon, 15 Jun 2020 10:54:45 -0700 Message-ID: Subject: Re: net/sched/sch_fq.c:966:12: warning: stack frame size of 1400 bytes in function 'fq_dump' To: Nick Desaulniers Cc: kernel test robot , kbuild-all@lists.01.org, clang-built-linux , LKML Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jun 15, 2020 at 10:44 AM Nick Desaulniers wrote: > > On Mon, Jun 15, 2020 at 9:17 AM 'Eric Dumazet' via Clang Built Linux > wrote: > > > > On Sun, Jun 14, 2020 at 11:26 PM kernel test robot wrote: > > > > > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master > > > head: 96144c58abe7ff767e754b5b80995f7b8846d49b > > > commit: 39d010504e6b4485d7ceee167743620dd33f4417 net_sched: sch_fq: add horizon attribute > > > date: 6 weeks ago > > > :::::: branch date: 3 hours ago > > > :::::: commit date: 6 weeks ago > > > config: arm-randconfig-r006-20200614 (attached as .config) > > > compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project c669a1ed6386d57a75a602b53266466dae1e1d84) > > > reproduce (this is a W=1 build): > > > wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross > > > chmod +x ~/bin/make.cross > > > # install arm cross compiling tool for clang build > > > # apt-get install binutils-arm-linux-gnueabi > > > git checkout 39d010504e6b4485d7ceee167743620dd33f4417 > > > # save the attached .config to linux build tree > > > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm > > > > > > If you fix the issue, kindly add following tag as appropriate > > > Reported-by: kernel test robot > > > > > > All warnings (new ones prefixed by >>, old ones prefixed by <<): > > > > > > >> net/sched/sch_fq.c:966:12: warning: stack frame size of 1400 bytes in function 'fq_dump' [-Wframe-larger-than=] > > > static int fq_dump(struct Qdisc *sch, struct sk_buff *skb) > > > ^ > > > > > > This looks like a bug in CLANG on ARM, there is no way fq_dump() could > > consume so much stack space. > > You can use > https://github.com/ClangBuiltLinux/frame-larger-than > to help debug these. You might be surprised who's doing larger stack > allocations than expected. What is wrong with scripts/checkstack.pl ? > > > > > > > > > > 1 warning generated. > > > > > > # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=39d010504e6b4485d7ceee167743620dd33f4417 > > > git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git > > > git remote update linus > > > git checkout 39d010504e6b4485d7ceee167743620dd33f4417 > > > vim +/fq_dump +966 net/sched/sch_fq.c > > > > > > afe4fd062416b1 Eric Dumazet 2013-08-29 965 > > > afe4fd062416b1 Eric Dumazet 2013-08-29 @966 static int fq_dump(struct Qdisc *sch, struct sk_buff *skb) > > > afe4fd062416b1 Eric Dumazet 2013-08-29 967 { > > > afe4fd062416b1 Eric Dumazet 2013-08-29 968 struct fq_sched_data *q = qdisc_priv(sch); > > > 48872c11b77271 Eric Dumazet 2018-11-11 969 u64 ce_threshold = q->ce_threshold; > > > 39d010504e6b44 Eric Dumazet 2020-05-01 970 u64 horizon = q->horizon; > > > afe4fd062416b1 Eric Dumazet 2013-08-29 971 struct nlattr *opts; > > > afe4fd062416b1 Eric Dumazet 2013-08-29 972 > > > ae0be8de9a53cd Michal Kubecek 2019-04-26 973 opts = nla_nest_start_noflag(skb, TCA_OPTIONS); > > > afe4fd062416b1 Eric Dumazet 2013-08-29 974 if (opts == NULL) > > > afe4fd062416b1 Eric Dumazet 2013-08-29 975 goto nla_put_failure; > > > afe4fd062416b1 Eric Dumazet 2013-08-29 976 > > > 65c5189a2b57b9 Eric Dumazet 2013-11-15 977 /* TCA_FQ_FLOW_DEFAULT_RATE is not used anymore */ > > > 65c5189a2b57b9 Eric Dumazet 2013-11-15 978 > > > 48872c11b77271 Eric Dumazet 2018-11-11 979 do_div(ce_threshold, NSEC_PER_USEC); > > > 39d010504e6b44 Eric Dumazet 2020-05-01 980 do_div(horizon, NSEC_PER_USEC); > > > 48872c11b77271 Eric Dumazet 2018-11-11 981 > > > afe4fd062416b1 Eric Dumazet 2013-08-29 982 if (nla_put_u32(skb, TCA_FQ_PLIMIT, sch->limit) || > > > afe4fd062416b1 Eric Dumazet 2013-08-29 983 nla_put_u32(skb, TCA_FQ_FLOW_PLIMIT, q->flow_plimit) || > > > afe4fd062416b1 Eric Dumazet 2013-08-29 984 nla_put_u32(skb, TCA_FQ_QUANTUM, q->quantum) || > > > afe4fd062416b1 Eric Dumazet 2013-08-29 985 nla_put_u32(skb, TCA_FQ_INITIAL_QUANTUM, q->initial_quantum) || > > > afe4fd062416b1 Eric Dumazet 2013-08-29 986 nla_put_u32(skb, TCA_FQ_RATE_ENABLE, q->rate_enable) || > > > 76a9ebe811fb3d Eric Dumazet 2018-10-15 987 nla_put_u32(skb, TCA_FQ_FLOW_MAX_RATE, > > > 76a9ebe811fb3d Eric Dumazet 2018-10-15 988 min_t(unsigned long, q->flow_max_rate, ~0U)) || > > > f52ed89971adbe Eric Dumazet 2013-11-15 989 nla_put_u32(skb, TCA_FQ_FLOW_REFILL_DELAY, > > > f52ed89971adbe Eric Dumazet 2013-11-15 990 jiffies_to_usecs(q->flow_refill_delay)) || > > > 06eb395fa9856b Eric Dumazet 2015-02-04 991 nla_put_u32(skb, TCA_FQ_ORPHAN_MASK, q->orphan_mask) || > > > 77879147a3481b Eric Dumazet 2016-09-19 992 nla_put_u32(skb, TCA_FQ_LOW_RATE_THRESHOLD, > > > 77879147a3481b Eric Dumazet 2016-09-19 993 q->low_rate_threshold) || > > > 48872c11b77271 Eric Dumazet 2018-11-11 994 nla_put_u32(skb, TCA_FQ_CE_THRESHOLD, (u32)ce_threshold) || > > > 583396f4ca4d6e Eric Dumazet 2020-03-16 995 nla_put_u32(skb, TCA_FQ_BUCKETS_LOG, q->fq_trees_log) || > > > 39d010504e6b44 Eric Dumazet 2020-05-01 996 nla_put_u32(skb, TCA_FQ_TIMER_SLACK, q->timer_slack) || > > > 39d010504e6b44 Eric Dumazet 2020-05-01 997 nla_put_u32(skb, TCA_FQ_HORIZON, (u32)horizon) || > > > 39d010504e6b44 Eric Dumazet 2020-05-01 998 nla_put_u8(skb, TCA_FQ_HORIZON_DROP, q->horizon_drop)) > > > afe4fd062416b1 Eric Dumazet 2013-08-29 999 goto nla_put_failure; > > > afe4fd062416b1 Eric Dumazet 2013-08-29 1000 > > > d59b7d8059ddc4 Yang Yingliang 2014-03-12 1001 return nla_nest_end(skb, opts); > > > afe4fd062416b1 Eric Dumazet 2013-08-29 1002 > > > afe4fd062416b1 Eric Dumazet 2013-08-29 1003 nla_put_failure: > > > afe4fd062416b1 Eric Dumazet 2013-08-29 1004 return -1; > > > afe4fd062416b1 Eric Dumazet 2013-08-29 1005 } > > > afe4fd062416b1 Eric Dumazet 2013-08-29 1006 > > > > > > :::::: The code at line 966 was first introduced by commit > > > :::::: afe4fd062416b158a8a8538b23adc1930a9b88dc pkt_sched: fq: Fair Queue packet scheduler > > > > > > :::::: TO: Eric Dumazet > > > :::::: CC: David S. Miller > > > > > > --- > > > 0-DAY CI Kernel Test Service, Intel Corporation > > > https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org > > > _______________________________________________ > > > kbuild mailing list -- kbuild@lists.01.org > > > To unsubscribe send an email to kbuild-leave@lists.01.org > > > > -- > > You received this message because you are subscribed to the Google Groups "Clang Built Linux" group. > > To unsubscribe from this group and stop receiving emails from it, send an email to clang-built-linux+unsubscribe@googlegroups.com. > > To view this discussion on the web visit https://groups.google.com/d/msgid/clang-built-linux/CANn89i%2Bs%3DoFTq6KFhT0z1CReQPZCGoEPShEFHVvXAmC9sUDH7g%40mail.gmail.com. > > > > -- > Thanks, > ~Nick Desaulniers