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 2972CC433FE for ; Mon, 7 Dec 2020 19:00:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D3068238E2 for ; Mon, 7 Dec 2020 19:00:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725917AbgLGTAj (ORCPT ); Mon, 7 Dec 2020 14:00:39 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54228 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725915AbgLGTAj (ORCPT ); Mon, 7 Dec 2020 14:00:39 -0500 Received: from mail-ot1-x332.google.com (mail-ot1-x332.google.com [IPv6:2607:f8b0:4864:20::332]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 35653C061793 for ; Mon, 7 Dec 2020 10:59:53 -0800 (PST) Received: by mail-ot1-x332.google.com with SMTP id i6so7412155otr.2 for ; Mon, 07 Dec 2020 10:59:53 -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=sO70rTXmp2oyDatETg7DesVuEq1X6+/krRSf9vscnwQ=; b=Dw+/2PuOQszPMbMmj8lHMutCOxqVWaouXaTdmrJ6UoBX4pueHAhD2ARU6aK8IZ1FHV 7UybLcFZm4KJVf+LwdKaRJXmLClkqjhqLJKN1v1yCZ7rFtf1HwKcGCu0OYAA7uFc1Na3 LxSoAyvzSY5idzlkzH4klStFxx7JhTfQmaFjjTPHvQhaezdSvQSgKpZqFKNap6htbDg5 Z+XIoH5q9Q6uLya/YxWe19mTmwEe8T1FDKcxiVgOOhYD4veOH14rELKlADkxap/oTJcx efLTXJOu7Qo9zhAzWpBct7MtBB2Cgax81W54gMWcc3ESot4aSX3oIHE2xTS0mCRE7p5R PGYA== 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=sO70rTXmp2oyDatETg7DesVuEq1X6+/krRSf9vscnwQ=; b=lQk1FZcPsUAHUBims3ET5S9ZB/AhYFZ0eUYVHebzVJf+cZzKhGbn6j/9AVAm0GKNf9 bU8MtSjaPdRRCi5QjRsS7PhCg3fwxXZJaFqrQpr2jd790SCwQPx0JhJ0CoGbaRIpw4Qm DuJmAarJhqLh8QKtp0/COyzTNJlXcs5W/1w48fMFb9zXdS3Ong5iMTnUwalEOG4QoxLi Vngmce29Pl7XKLtnlHy0FF+ibcvFsQdZzsG0HbaqNgCEsEBmvxInGxPDyzWFxHlclnrF 91ICvKpI+MSuUV3ELifYkGNmsrfRava1BUbRUVEUXFs+lCMSdpItyS4E/KXMkyI8A0CU kl9A== X-Gm-Message-State: AOAM531UTHTeQn5vpk5jUzfeb1p7CwS1TyYYN63hd2/shXbiP2flIvtT dH7/Pi/FKDPoOdcitsZOvVunKdAH6Fk= X-Google-Smtp-Source: ABdhPJyFmlzaXXi11Vksn3uAeJIXXoiYPuhsopkeg4+m5ne+bZzHUaauJ5VjlTpxbEWZ+fenahN4rQ== X-Received: by 2002:a9d:4588:: with SMTP id x8mr14307439ote.169.1607367592380; Mon, 07 Dec 2020 10:59:52 -0800 (PST) Received: from Davids-MacBook-Pro.local ([8.48.134.51]) by smtp.googlemail.com with ESMTPSA id o21sm1500347otj.1.2020.12.07.10.59.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 07 Dec 2020 10:59:51 -0800 (PST) Subject: Re: Latest libbpf fails to load programs compiled with old LLVM To: Alexei Starovoitov Cc: =?UTF-8?Q?Toke_H=c3=b8iland-J=c3=b8rgensen?= , 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> <82dc6d2b-95b6-ab50-8bdb-6e90cfb32059@gmail.com> From: David Ahern Message-ID: <9d91a663-abd3-603d-de5e-26c572eeac05@gmail.com> Date: Mon, 7 Dec 2020 11:59:47 -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 11:14 AM, Alexei Starovoitov wrote: > 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 your record player seems to be stuck. Could you give it a little bump so it can move on to the next track? Thanks. I do work on other things besides iproute2. > stability and consistency then certainly not. > Your statement has huge impacts on what users can expect from a library and is inconsistent with other libraries I have used. Hence, my request for clarification on your comment about 'changing interfaces, removing functions and features.'