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=-4.2 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,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 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 31CD3C433FE for ; Mon, 7 Dec 2020 18:03:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0EB352389E for ; Mon, 7 Dec 2020 18:03:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726000AbgLGSDi (ORCPT ); Mon, 7 Dec 2020 13:03:38 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45312 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725774AbgLGSDi (ORCPT ); Mon, 7 Dec 2020 13:03:38 -0500 Received: from mail-ot1-x330.google.com (mail-ot1-x330.google.com [IPv6:2607:f8b0:4864:20::330]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 288E8C061749 for ; Mon, 7 Dec 2020 10:02:58 -0800 (PST) Received: by mail-ot1-x330.google.com with SMTP id w3so12680155otp.13 for ; Mon, 07 Dec 2020 10:02:58 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=2gKa2VMXYOhra4nPv0+tKTjCDtRbDIgbb+Ar/ivqWFg=; b=uZ1bZWBqjFPSWXiVQoVRI5V9bl91BujbXNaw+2I2qWcfZ4JllAzColhQthlRB5nkEX z0JxjXlf2jh5ztW+pHTtb19jGfNfcWnqmtLRyEmWNx2dBRgwYpYtsf1eCm02tTq9Qx4m GAe3bQKJ+8vE4WBKml/VAvxrkDfYSdeCyQUCtdJwFi0aS6fq4vywSFY1qkntAeLiC6bX 0EAvbxw9mEBNScuZ3OXbUMEmq/FhbrkA7TDh/8X6R+YqvYVkBhdmeVmjH8A00bbfbHU+ mqsDK4hXeIHVe7AIm7hNmlJih5IZNQp7GQ6qvBmPFBe6Nc6FqfxauCRu8CcZIWPNSZxK ZI4g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=2gKa2VMXYOhra4nPv0+tKTjCDtRbDIgbb+Ar/ivqWFg=; b=o3La5ULTY3WCHUZFq+Cb7GnHQlaL/UtT6laVArNAC13h1ddg6b1CYmG0SdWcKu7ZbI ntr3Dn++AcZ4FtmtAbZvxO7JHiJ+iEdva+EVv5Udo8E3oot0pik+1yNd5ErEAiF0BKSV HveyJlIxhq/WNlFBPhfvEuMoceLyqB1lWavvmOqSHfWTEysQ5LFFJuR6z/c4eJSCY+P/ CI5ih3K8dcrqeSOqP2esDjBCpPQdeDD4XeHuQFCyHWJy3lLxdaZU/rmApnIKYuqFL35p 1MuhQM5knHvlK0mOo+bvrSkiudNGN4r1fwVLWsfVibCsvB62MjU8hKoPxmam6568KlQf QA5w== X-Gm-Message-State: AOAM530PD3O0eI8k9ABgO3hzpqrWIfSW3CRlihSHVVSED1qfofXedCHv DSOfd1Z6KXrM/eS/0F3JTU2/qL7nbNM= X-Google-Smtp-Source: ABdhPJzQ0Q9pcpzU/RWY3KTUC+nHnrE/1WZxWki4drkkgltbtYhYhU3EAuq7Cv7mr/tblxSSua/PZA== X-Received: by 2002:a9d:3a24:: with SMTP id j33mr13809109otc.259.1607364176909; Mon, 07 Dec 2020 10:02:56 -0800 (PST) Received: from Davids-MacBook-Pro.local ([8.48.134.51]) by smtp.googlemail.com with ESMTPSA id l5sm2066181ooo.2.2020.12.07.10.02.55 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 07 Dec 2020 10:02:56 -0800 (PST) Subject: Re: Latest libbpf fails to load programs compiled with old LLVM To: Alexei Starovoitov , =?UTF-8?Q?Toke_H=c3=b8iland-J=c3=b8rgensen?= Cc: Andrii Nakryiko , Yonghong Song , bpf 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> From: David Ahern Message-ID: <82dc6d2b-95b6-ab50-8bdb-6e90cfb32059@gmail.com> Date: Mon, 7 Dec 2020 11:02:54 -0700 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.16; rv:78.0) Gecko/20100101 Thunderbird/78.5.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org 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?