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=-2.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 9D503C4361B for ; Mon, 7 Dec 2020 18:15:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5F398238D6 for ; Mon, 7 Dec 2020 18:15:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725994AbgLGSPD (ORCPT ); Mon, 7 Dec 2020 13:15:03 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47076 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725816AbgLGSPC (ORCPT ); Mon, 7 Dec 2020 13:15:02 -0500 Received: from mail-lj1-x22f.google.com (mail-lj1-x22f.google.com [IPv6:2a00:1450:4864:20::22f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2C3B4C061749 for ; Mon, 7 Dec 2020 10:14:22 -0800 (PST) Received: by mail-lj1-x22f.google.com with SMTP id a1so14685785ljq.3 for ; Mon, 07 Dec 2020 10:14:22 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=Q4If43plamllKjhrMKwl+1SOz0Lg20MA17+5IYuyUsg=; b=t8EtgndlDk+OpFR8akB0UTjwPiuO3CAtwUDLdxM+3si5DpECvmHJmxkgKXb3mzw7vE ekFnHDvLMXdGH8GbpF1qzJML3Tvq+h7Ef1JxQYY83+SH8OwHit7Cr3+cLO7I9VR4HZQr jZo0AU+wRad8HL72Io9Q6HGDKIsG53S9ACiK833HcFtphMPiniW8ueWxm5klIyUHvZbx 1VdxrdS9RK1mZ5rYijkMIYlKlhSdSDciwqRvUr2f8b6Wn8ZmD1+n3J+pmObvXhIjTJOd LsRmimXZlhGKPd+MpMu0YZHzC/pyPujhnrXExkOtFTScxqs5C6apRCn+QXw++DwEyhJw HKVA== 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=Q4If43plamllKjhrMKwl+1SOz0Lg20MA17+5IYuyUsg=; b=nfh8WXmvDYpV9xfsVH2+wdvXozQcg95Aiskkgio8tDTBH/Ip6DnaY6MZAuQ7nMNJSn FmGM2Y6e9BDV4tCX0cDBOWVd8yVW/VKsjpPGNFxna+nuhtbGp/yuMyTaJI/djYo1c47Y VOb0/QZgFGbF1ceSDjPWCadqKdQk/lXxUk7FijnU6O6LAqTDA0FYAhuKewhQj9zCanf7 v4GN2AYmTacvzsnYXupMyDZ9V3nY5NjICfkLGHQ5qhjNxSC+bQ8OhLanaTedjpMV6vCm vuree1XJQNA3it6WQxELVopTg1CvSE/lkwK665vyh7knmLRHQrp2ICLgBgTbuJZkkxGa Q+nA== X-Gm-Message-State: AOAM531r6c59VaKv5Xmffn/yC0x/aIpm9hO8ZLXUJFXeTrPiLw2AT0Dh VhTIpLQLo24zgA1FPP9u7E53CcBQHFM5jEcFvcg= X-Google-Smtp-Source: ABdhPJxMLIYo7n0YqkPOv+cksoZ5U7pW9nktcnQBGZY7lM2ChIczzEgN/utkK+55zaYpmqRKswvzmqCjrnvUYWGesV8= X-Received: by 2002:a2e:b4b3:: with SMTP id q19mr1553513ljm.121.1607364860669; Mon, 07 Dec 2020 10:14:20 -0800 (PST) MIME-Version: 1.0 References: <87lfeebwpu.fsf@toke.dk> <10679e62-50a2-4c01-31d2-cb79c01e4cbf@fb.com> <87r1o59aoc.fsf@toke.dk> <6801fcdb-932e-c185-22db-89987099b553@fb.com> <875z5d7ufl.fsf@toke.dk> <878sa9619d.fsf@toke.dk> <82dc6d2b-95b6-ab50-8bdb-6e90cfb32059@gmail.com> In-Reply-To: <82dc6d2b-95b6-ab50-8bdb-6e90cfb32059@gmail.com> From: Alexei Starovoitov Date: Mon, 7 Dec 2020 10:14:09 -0800 Message-ID: Subject: Re: Latest libbpf fails to load programs compiled with old LLVM To: David Ahern Cc: =?UTF-8?B?VG9rZSBIw7hpbGFuZC1Kw7hyZ2Vuc2Vu?= , Andrii Nakryiko , Yonghong Song , bpf Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org On Mon, Dec 7, 2020 at 10:02 AM David Ahern wrote: > > On 12/7/20 9:20 AM, Alexei Starovoitov wrote: > > The user space library is not a kernel. > > The library will change its interface. It will remove functions, features, etc. > > That's what .map is for. > > So any user/package wanting to leverage libbpf can not expect stability > or consistency with its APIs? If you're talking about iproute2 and your own convoluted definition of stability and consistency then certainly not.