From nobody Wed Dec 17 15:43:03 2025 Received: from mail-pl1-f173.google.com (mail-pl1-f173.google.com [209.85.214.173]) (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 50201189F46 for ; Tue, 9 Jul 2024 20:42:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.173 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720557777; cv=none; b=qQTouuL/jnp02gtOo+l6uN/fuikNg+LC9gatFx+HbZvWvwdZrm92LK7HnNd9lPMPVUm1nxkohvxVMLM5eJ0FeA25j8/kte3fIJ3+1sB5VnjTDL/ERRTNvvXmBmocMjBHGmnH3fqXmlhZ679swnySCtiZGWAQs7kUHdk9uM4+TJA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720557777; c=relaxed/simple; bh=5hJtb8O8aGVuCzIkuDaH1C7eL8jW1PgUZ7H/z2BPSw8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=gv/FqmR41Uc5cd/6LabiTBOJl7kafX9n3vwCaRk03DkuMyvzXm7lVTQFMe2alog3w6WTIK1LwYEIzHA2Nk3qgIBTi/2yjG/SieZO1zO4I/nufDamRn75BWqVZK5EuTSHnpUEZAxXAOPI+X26YjXa4dr/9Dx4eK1QKSEXypDfnjw= 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=209.85.214.173 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-f173.google.com with SMTP id d9443c01a7336-1fb4a332622so21915345ad.2 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=BBKQUB/+10/otM59ZptExoq2T7YjJO9FyamvrC1k7VxS+UQREaEQ/Nurr7U+Uz8pTT 855f140s7174oBKbL6FPPx8qEBddzugDA5iMsGru73/vZuw/GT0+8zu+aIk7SgM+gykQ v49bguLwuOVHmmMoDdl/E2oR5UYufNdvO7zDH7Pcq8ZAuN9Z+TK3Ter7Bbu6BlzvFbdu PfpYHnz6sxgtMfqR8EGbSTiJNohUzNBqJEsk4BZyznB5gxWdgCPsaMWWashjwhYtvRTJ nvddNFSl6bF0fowC9CyM5+z/olQJfG2ScoTX0x19vEtOUKCGVDb3uWYW1gnJyU7TvsTR 6Hzg== X-Forwarded-Encrypted: i=1; AJvYcCUhyyJ5wE3Z0XKLWESWlxbAqN+dyauDmbjHWUCQ5xi4eU9pRCvOS4uswcen2BGLF1Fo2kOHNsrHqBTN32VMWmXSpFdnVXAoA+/iKFln X-Gm-Message-State: AOJu0Yznao3ZebezAd6ueh1ennanVW830VOVZN3OdLLqoqvCNus10ypc /xQ8p2xDvt+/JfdUyB1ldnxiCKVW+Q2CXFjwd9rBJsmBg3I7Iz3ABj1JjYfO3g== 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: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 :=3D -f $(srctree)/tools/build/Makefile.build dir=3D. obj =20 +# More than just $(Q), we sometimes want to suppress all command output fr= om a +# recursive make -- even the 'up to date' printout. +ifeq ($(V),1) + Q ?=3D + SILENT_MAKE =3D +$(Q)$(MAKE) +else + Q ?=3D @ + SILENT_MAKE =3D +$(Q)$(MAKE) --silent +endif + fixdep: - $(Q)$(MAKE) -C $(srctree)/tools/build CFLAGS=3D LDFLAGS=3D $(OUTPUT)fixdep + $(SILENT_MAKE) -C $(srctree)/tools/build CFLAGS=3D LDFLAGS=3D $(OUTPUT)fi= xdep =20 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=3D =20 all: =20 +OUTPUT ?=3D ./ +OUTPUT :=3D $(abspath $(OUTPUT))/ export srctree OUTPUT CC LD CFLAGS V include $(srctree)/tools/build/Makefile.include =20 @@ -141,7 +143,13 @@ all: fixdep =20 all_cmd: $(CMD_TARGETS) check =20 -$(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/linu= x/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' diff= ers 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/l= inux/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' d= iffers from latest version at 'include/uapi/linux/if_xdp.h'" >&2 )) || true + $(SILENT_MAKE) -C $(srctree)/tools/build CFLAGS=3D LDFLAGS=3D OUTPUT=3D$(= SHARED_OBJDIR) $(SHARED_OBJDIR)fixdep $(Q)$(MAKE) $(build)=3Dlibbpf OUTPUT=3D$(SHARED_OBJDIR) CFLAGS=3D"$(CFLAG= S) $(SHLIB_FLAGS)" =20 -$(BPF_IN_STATIC): force $(BPF_GENERATED) +$(BPF_IN_STATIC): force $(BPF_GENERATED) | $(STATIC_OBJDIR) + $(SILENT_MAKE) -C $(srctree)/tools/build CFLAGS=3D LDFLAGS=3D OUTPUT=3D$(= STATIC_OBJDIR) $(STATIC_OBJDIR)fixdep $(Q)$(MAKE) $(build)=3Dlibbpf OUTPUT=3D$(STATIC_OBJDIR) =20 $(BPF_HELPER_DEFS): $(srctree)/tools/include/uapi/linux/bpf.h --=20 2.45.2.803.g4e1b14247a-goog