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=-6.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 C285EC433E2 for ; Thu, 17 Sep 2020 08:12:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7FC142075B for ; Thu, 17 Sep 2020 08:12:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="W9uIpS/P" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726455AbgIQIMd (ORCPT ); Thu, 17 Sep 2020 04:12:33 -0400 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:32442 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726397AbgIQIMO (ORCPT ); Thu, 17 Sep 2020 04:12:14 -0400 X-Greylist: delayed 359 seconds by postgrey-1.27 at vger.kernel.org; Thu, 17 Sep 2020 04:12:14 EDT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1600330332; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=cBI8f1/R2C8gGei3me+pMyZKfvONcZONLHWJofQzyXM=; b=W9uIpS/P8QocwiPUld8fry6/G8olyILp5dCitPa8nkxIGXoFT+92eY3Kfns0/JbeFouUQv b4SGejwEm6wHm1Aubpdn/z7FC9aHl8AlzSMr8dpSmKOZ8xo+eQWp7gyfJ+mefC1+wYqWBM yBuTaGFgTNSsei8MikUMsLXYr3r8HgY= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-420-YfU2mhUcN_Cr4TOEz-iS8g-1; Thu, 17 Sep 2020 04:04:56 -0400 X-MC-Unique: YfU2mhUcN_Cr4TOEz-iS8g-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 05A841018722; Thu, 17 Sep 2020 08:04:55 +0000 (UTC) Received: from krava (ovpn-114-176.ams2.redhat.com [10.36.114.176]) by smtp.corp.redhat.com (Postfix) with SMTP id 4E6941002D69; Thu, 17 Sep 2020 08:04:53 +0000 (UTC) Date: Thu, 17 Sep 2020 10:04:52 +0200 From: Jiri Olsa To: Seth Forshee Cc: Jiri Olsa , Alexei Starovoitov , Daniel Borkmann , netdev@vger.kernel.org, bpf@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: resolve_btfids breaks kernel cross-compilation Message-ID: <20200917080452.GB2411168@krava> References: <20200916194733.GA4820@ubuntu-x1> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200916194733.GA4820@ubuntu-x1> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Sep 16, 2020 at 02:47:33PM -0500, Seth Forshee wrote: > The requirement to build resolve_btfids whenever CONFIG_DEBUG_INFO_BTF > is enabled breaks some cross builds. For example, when building a 64-bit > powerpc kernel on amd64 I get: > > Auto-detecting system features: > ... libelf: [ [32mon[m ] > ... zlib: [ [32mon[m ] > ... bpf: [ [31mOFF[m ] > > BPF API too old > make[6]: *** [Makefile:295: bpfdep] Error 1 > > The contents of tools/bpf/resolve_btfids/feature/test-bpf.make.output: > > In file included from /home/sforshee/src/u-k/unstable/tools/arch/powerpc/include/uapi/asm/bitsperlong.h:11, > from /usr/include/asm-generic/int-ll64.h:12, > from /usr/include/asm-generic/types.h:7, > from /usr/include/x86_64-linux-gnu/asm/types.h:1, > from /home/sforshee/src/u-k/unstable/tools/include/linux/types.h:10, > from /home/sforshee/src/u-k/unstable/tools/include/uapi/linux/bpf.h:11, > from test-bpf.c:3: > /home/sforshee/src/u-k/unstable/tools/include/asm-generic/bitsperlong.h:14:2: error: #error Inconsistent word size. Check asm/bitsperlong.h > 14 | #error Inconsistent word size. Check asm/bitsperlong.h > | ^~~~~ > > This is because tools/arch/powerpc/include/uapi/asm/bitsperlong.h sets > __BITS_PER_LONG based on the predefinied compiler macro __powerpc64__, > which is not defined by the host compiler. What can we do to get cross > builds working again? could you please share the command line and setup? thanks, jirka