From patchwork Tue Jul 9 20:41:53 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Brian Norris X-Patchwork-Id: 13728495 X-Patchwork-Delegate: bpf@iogearbox.net Received: from mail-pl1-f181.google.com (mail-pl1-f181.google.com [209.85.214.181]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 518FB189F48 for ; Tue, 9 Jul 2024 20:42:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.181 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720557776; cv=none; b=CDCEA81oC/wMoCmlLynyWiQIFqKH7LkMLsWHeIbZnbEyeqn6Du/NZMa39C394+s9gQVziHMWgD4B8qwuXAHvrUrsIIqqRRCufz3X2wIR0e1nj6VwpbHJTg8ry+//IfSkul/enrObe483YfbY6CdjA16ql/fzKcAwR9ryPIckCeE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720557776; c=relaxed/simple; bh=5hJtb8O8aGVuCzIkuDaH1C7eL8jW1PgUZ7H/z2BPSw8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ouGq+0ibiyp7GcNHrqjAGyrk6vQvmqz3eG+bs3CXCNVkU4qtth3HP70O+ZxjZbXqWt+g97/+VLo0cO9+zNNWyxXItJwV4mXCLLiEdM2NCVHFrLGo914Gkh3S8ofUQUT0xNyg3+6Z9oXkzikQQHX2mIE7A80TMIuvS89qeg5/i4M= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org; spf=pass smtp.mailfrom=chromium.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b=V/rDWky3; arc=none smtp.client-ip=209.85.214.181 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=chromium.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="V/rDWky3" Received: by mail-pl1-f181.google.com with SMTP id d9443c01a7336-1fb1ff21748so29545695ad.3 for ; Tue, 09 Jul 2024 13:42:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1720557775; x=1721162575; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=b2jCXrLvZIYGuyX7wwzQt98iRS81M5D6rZNTDsiflt0=; b=V/rDWky3NVcNl9fX2hZ8HBmQQ5e2kwGhsheuKWUkN5k1uj+eVyIxQBD0YSRh/NH3yx OCWOp7aqImTKs3Io0bdpAkOu7fsPPKWqcrAhGKSXQ157Imf2QrFFcNlkqPxpdyVylnfL /rvFYkwo2j31mpHwdasyzpwb9r+fXyqNdewe0= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1720557775; x=1721162575; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=b2jCXrLvZIYGuyX7wwzQt98iRS81M5D6rZNTDsiflt0=; b=RlVYLLGppYs+q1XOUSqITXH/QHEP9oufmcsSX+VWneaMks448ZPT+n9NO01C6hAHPt dY12t3IPaGqH+dgsNzqCaaHjOOdQXraPY4L1KPRpWpA+xEe2TLsrtyYB1meLPVILiQo5 xnV0Ggb2Qj//A52b0NzP8oUpG/FT30cYqRrqJ6pu99fuv1QLikkbOGy8BFvnnVyzlqPy 7yBrGvJq+2ZkLV+mwoiknr7Y34o+ImzwkJyF4/I4RhAPMoC+Tg+zfoWitoofh9pkvkUy rtEM82R0dZ/icidLyRb19SdkvboUhDZt3f6gDkjDWLLpql/vbCxvW8DslY0sWT2yDkw4 t5vA== X-Forwarded-Encrypted: i=1; AJvYcCVoiA3zN81hR6n1JP2zNm0QNEtg7aRnvGTBNVzIDbbRmwkN7PtB4yLx8gl9m5P6Q8qWlLOGFclA98pNfbW59lr86PYx X-Gm-Message-State: AOJu0YxaTSeHrX3XMqOdFPwpugYEoC1uN80/hbpeNq9jc+I90gCn2JKk Wj5WdioI9WJ3L5ZjLM/ZDAEafsEv2JKVulrRl6zANK69QITykCj9xqfSK6lwSQ== X-Google-Smtp-Source: AGHT+IHjK3RExiQOmuK3iDTX/Upl24GWjmDes7leC1u1b1/8tRoqtQUBfMBlLxfOsmft2g4mqCkU8A== X-Received: by 2002:a17:903:11ce:b0:1fb:365:5e0 with SMTP id d9443c01a7336-1fbb6d25264mr29004165ad.14.1720557774614; Tue, 09 Jul 2024 13:42:54 -0700 (PDT) Received: from localhost ([2620:15c:9d:2:4d59:98c6:8095:9b12]) by smtp.gmail.com with UTF8SMTPSA id d9443c01a7336-1fbb6ab6c53sm20318625ad.153.2024.07.09.13.42.53 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 09 Jul 2024 13:42:54 -0700 (PDT) From: Brian Norris To: Arnaldo Carvalho de Melo , Namhyung Kim , Ian Rogers , Thomas Richter , Josh Poimboeuf , Peter Zijlstra Cc: linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, Masahiro Yamada , Brian Norris , Jiri Olsa Subject: [PATCH v3 3/3] tools build: Correct bpf fixdep dependencies Date: Tue, 9 Jul 2024 13:41:53 -0700 Message-ID: <20240709204203.1481851-4-briannorris@chromium.org> X-Mailer: git-send-email 2.45.2.803.g4e1b14247a-goog In-Reply-To: <20240709204203.1481851-1-briannorris@chromium.org> References: <20240709204203.1481851-1-briannorris@chromium.org> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: bpf@iogearbox.net The dependencies in tools/lib/bpf/Makefile are incorrect. Before we recurse to build $(BPF_IN_STATIC), we need to build its 'fixdep' executable. I can't use the usual shortcut from Makefile.include: : fixdep because its 'fixdep' target relies on $(OUTPUT), and $(OUTPUT) differs in the parent 'make' versus the child 'make' -- so I imitate it via open-coding. I tweak a few $(MAKE) invocations while I'm at it, because 1. I'm adding a new recursive make; and 2. these recursive 'make's print spurious lines about files that are "up to date" (which isn't normally a feature in Kbuild subtargets) or "jobserver not available" (see [1]) I also need to tweak the assignment of the OUTPUT variable, so that relative path builds work. For example, for 'make tools/lib/bpf', OUTPUT is unset, and is usually treated as "cwd" -- but recursive make will change cwd and so OUTPUT has a new meaning. For consistency, I ensure OUTPUT is always an absolute path. And $(Q) gets a backup definition in tools/build/Makefile.include, because Makefile.include is sometimes included without tools/build/Makefile, so the "quiet command" stuff doesn't actually work consistently without it. After this change, top-level builds result in an empty grep result from: $ grep 'cannot find fixdep' $(find tools/ -name '*.cmd') [1] https://www.gnu.org/software/make/manual/html_node/MAKE-Variable.html If we're not using $(MAKE) directly, then we need to use more '+'. Signed-off-by: Brian Norris Acked-by: Jiri Olsa --- Changes in v3: - add Jiri's Acked-by Changes in v2: - also fix libbpf shared library rules - ensure OUTPUT is always set, and always an absolute path - add backup $(Q) definition in tools/build/Makefile.include tools/build/Makefile.include | 12 +++++++++++- tools/lib/bpf/Makefile | 14 ++++++++++++-- 2 files changed, 23 insertions(+), 3 deletions(-) diff --git a/tools/build/Makefile.include b/tools/build/Makefile.include index 8dadaa0fbb43..0e4de83400ac 100644 --- a/tools/build/Makefile.include +++ b/tools/build/Makefile.include @@ -1,8 +1,18 @@ # SPDX-License-Identifier: GPL-2.0-only build := -f $(srctree)/tools/build/Makefile.build dir=. obj +# More than just $(Q), we sometimes want to suppress all command output from a +# recursive make -- even the 'up to date' printout. +ifeq ($(V),1) + Q ?= + SILENT_MAKE = +$(Q)$(MAKE) +else + Q ?= @ + SILENT_MAKE = +$(Q)$(MAKE) --silent +endif + fixdep: - $(Q)$(MAKE) -C $(srctree)/tools/build CFLAGS= LDFLAGS= $(OUTPUT)fixdep + $(SILENT_MAKE) -C $(srctree)/tools/build CFLAGS= LDFLAGS= $(OUTPUT)fixdep fixdep-clean: $(Q)$(MAKE) -C $(srctree)/tools/build clean diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile index 2cf892774346..630369c0091e 100644 --- a/tools/lib/bpf/Makefile +++ b/tools/lib/bpf/Makefile @@ -108,6 +108,8 @@ MAKEOVERRIDES= all: +OUTPUT ?= ./ +OUTPUT := $(abspath $(OUTPUT))/ export srctree OUTPUT CC LD CFLAGS V include $(srctree)/tools/build/Makefile.include @@ -141,7 +143,13 @@ all: fixdep all_cmd: $(CMD_TARGETS) check -$(BPF_IN_SHARED): force $(BPF_GENERATED) +$(SHARED_OBJDIR): + $(Q)mkdir -p $@ + +$(STATIC_OBJDIR): + $(Q)mkdir -p $@ + +$(BPF_IN_SHARED): force $(BPF_GENERATED) | $(SHARED_OBJDIR) @(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \ (diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \ echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true @@ -151,9 +159,11 @@ $(BPF_IN_SHARED): force $(BPF_GENERATED) @(test -f ../../include/uapi/linux/if_xdp.h -a -f ../../../include/uapi/linux/if_xdp.h && ( \ (diff -B ../../include/uapi/linux/if_xdp.h ../../../include/uapi/linux/if_xdp.h >/dev/null) || \ echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/if_xdp.h' differs from latest version at 'include/uapi/linux/if_xdp.h'" >&2 )) || true + $(SILENT_MAKE) -C $(srctree)/tools/build CFLAGS= LDFLAGS= OUTPUT=$(SHARED_OBJDIR) $(SHARED_OBJDIR)fixdep $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(SHARED_OBJDIR) CFLAGS="$(CFLAGS) $(SHLIB_FLAGS)" -$(BPF_IN_STATIC): force $(BPF_GENERATED) +$(BPF_IN_STATIC): force $(BPF_GENERATED) | $(STATIC_OBJDIR) + $(SILENT_MAKE) -C $(srctree)/tools/build CFLAGS= LDFLAGS= OUTPUT=$(STATIC_OBJDIR) $(STATIC_OBJDIR)fixdep $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(STATIC_OBJDIR) $(BPF_HELPER_DEFS): $(srctree)/tools/include/uapi/linux/bpf.h