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=-6.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 184ABC33CAA for ; Mon, 20 Jan 2020 13:07:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E0B3322314 for ; Mon, 20 Jan 2020 13:07:49 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="LgVUSukG" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729273AbgATNHs (ORCPT ); Mon, 20 Jan 2020 08:07:48 -0500 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:35120 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728600AbgATNGs (ORCPT ); Mon, 20 Jan 2020 08:06:48 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1579525607; 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: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=kMzta49FGi59zAWBh6JcpPryK5CAVyLgor/XGDFTJFQ=; b=LgVUSukG3ik0ak2C5mNhG38qBjx0MO9+6zi17Yu3mLqiV9pl8sjWXbLPSAdDZjXKLpwLN2 g8rGo8iCyrU+YS7o/jpxkfTCO2sZLdXNHz+USbnTMom2HDCQY8l9yBLvtKQQ3w1LmAH1C1 9VBOUYigCWUYRIcYseq5P814EgXDog0= Received: from mail-lj1-f198.google.com (mail-lj1-f198.google.com [209.85.208.198]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-291-DZwfZR8MPriuVpQfiw-yuw-1; Mon, 20 Jan 2020 08:06:46 -0500 X-MC-Unique: DZwfZR8MPriuVpQfiw-yuw-1 Received: by mail-lj1-f198.google.com with SMTP id g5so7538087ljj.22 for ; Mon, 20 Jan 2020 05:06:46 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:from:to:cc:date:message-id:in-reply-to :references:user-agent:mime-version:content-transfer-encoding; bh=kMzta49FGi59zAWBh6JcpPryK5CAVyLgor/XGDFTJFQ=; b=fqvuUmIdT9nVah8FxkGCPgJsNsfM694hOXUZGKN2hJVh49iU9cBP7dl6ExRaDdC6/c mP/5xkwjQQIqB7Sv7unQzYoISw8j+bmwkohAopp6oa8DcPR8G563FNdQ+nWifhOLLIdI iKU5Ej+VCCB529vGBAlPPzHBu68bSKfMm/sqL7hdmMi2oSIhRLajAznT/q+kKjBJ6Gi5 J9SBIL0uRQFKiUCPIn9rnXXpff4Xp9c13dn/v4MFCmn2Qu58vhz487zAu+TRk4f5hNy+ RWgmOiM9G5vmb78a4CYFJ9oEQ0zS3/7Vf8RtSPbF84L2AifZFbnRMiF27kuk+xhkMBfZ 2R+Q== X-Gm-Message-State: APjAAAXAjdHAfrzVJzhrYIgDO7ttkBhDuu7nti+lycHvk7CVuf18W/p4 n+unZccuPyjAbeu+TuiMKT2U5TeEfS3XUWw6dymSf1IF6IZU1xXnbgMQpnRn4krmLnKIhN8H1S0 B0n67+jbT3D2OOnv9fADuig== X-Received: by 2002:a05:651c:1a8:: with SMTP id c8mr13483664ljn.207.1579525604694; Mon, 20 Jan 2020 05:06:44 -0800 (PST) X-Google-Smtp-Source: APXvYqzo6PPrjA+yEC25WheWBME+LbIJh05BG+CMwVRxmNLaLUKATUm84PPo4NGjn917QF32fT66dg== X-Received: by 2002:a05:651c:1a8:: with SMTP id c8mr13483642ljn.207.1579525604292; Mon, 20 Jan 2020 05:06:44 -0800 (PST) Received: from alrua-x1.borgediget.toke.dk ([85.204.121.218]) by smtp.gmail.com with ESMTPSA id e8sm19898063ljb.45.2020.01.20.05.06.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Jan 2020 05:06:43 -0800 (PST) Received: by alrua-x1.borgediget.toke.dk (Postfix, from userid 1000) id 6CD9C1804D6; Mon, 20 Jan 2020 14:06:42 +0100 (CET) Subject: [PATCH bpf-next v5 02/11] tools/bpf/runqslower: Fix override option for VMLINUX_BTF From: =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= To: Alexei Starovoitov Cc: Daniel Borkmann , Martin KaFai Lau , Song Liu , Yonghong Song , Andrii Nakryiko , Doug Ledford , Jason Gunthorpe , "David S. Miller" , Jakub Kicinski , Jesper Dangaard Brouer , John Fastabend , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Shuah Khan , netdev@vger.kernel.org, bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, linux-kselftest@vger.kernel.org, clang-built-linux@googlegroups.com Date: Mon, 20 Jan 2020 14:06:42 +0100 Message-ID: <157952560237.1683545.17771785178857224877.stgit@toke.dk> In-Reply-To: <157952560001.1683545.16757917515390545122.stgit@toke.dk> References: <157952560001.1683545.16757917515390545122.stgit@toke.dk> User-Agent: StGit/0.21 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org From: Toke Høiland-Jørgensen The runqslower tool refuses to build without a file to read vmlinux BTF from. The build fails with an error message to override the location by setting the VMLINUX_BTF variable if autodetection fails. However, the Makefile doesn't actually work with that override - the error message is still emitted. Fix this by including the value of VMLINUX_BTF in the expansion, and only emitting the error message if the *result* is empty. Also permit running 'make clean' even though no VMLINUX_BTF is set. Fixes: 9c01546d26d2 ("tools/bpf: Add runqslower tool to tools/bpf") Signed-off-by: Toke Høiland-Jørgensen --- tools/bpf/runqslower/Makefile | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) diff --git a/tools/bpf/runqslower/Makefile b/tools/bpf/runqslower/Makefile index cff2fbcd29a8..3242ab874ac0 100644 --- a/tools/bpf/runqslower/Makefile +++ b/tools/bpf/runqslower/Makefile @@ -10,13 +10,9 @@ CFLAGS := -g -Wall # Try to detect best kernel BTF source KERNEL_REL := $(shell uname -r) -ifneq ("$(wildcard /sys/kernel/btf/vmlinux)","") -VMLINUX_BTF := /sys/kernel/btf/vmlinux -else ifneq ("$(wildcard /boot/vmlinux-$(KERNEL_REL))","") -VMLINUX_BTF := /boot/vmlinux-$(KERNEL_REL) -else -$(error "Can't detect kernel BTF, use VMLINUX_BTF to specify it explicitly") -endif +VMLINUX_BTF_PATHS := /sys/kernel/btf/vmlinux /boot/vmlinux-$(KERNEL_REL) +VMLINUX_BTF_PATH := $(or $(VMLINUX_BTF),$(firstword \ + $(wildcard $(VMLINUX_BTF_PATHS)))) abs_out := $(abspath $(OUTPUT)) ifeq ($(V),1) @@ -67,9 +63,14 @@ $(OUTPUT): $(call msg,MKDIR,$@) $(Q)mkdir -p $(OUTPUT) -$(OUTPUT)/vmlinux.h: $(VMLINUX_BTF) | $(OUTPUT) $(BPFTOOL) +$(OUTPUT)/vmlinux.h: $(VMLINUX_BTF_PATH) | $(OUTPUT) $(BPFTOOL) $(call msg,GEN,$@) - $(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@ + $(Q)if [ ! -e "$(VMLINUX_BTF_PATH)" ] ; then \ + echo "Couldn't find kernel BTF; set VMLINUX_BTF to" \ + "specify its location." >&2; \ + exit 1;\ + fi + $(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF_PATH) format c > $@ $(OUTPUT)/libbpf.a: | $(OUTPUT) $(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC) \