From nobody Tue Feb 10 15:43:40 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6B4FB28F5; Tue, 11 Feb 2025 00:29:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739233786; cv=none; b=mZEsY0pIpZELOL+PLmbcPYNU7G0zQ464+8vTO6CTEQw/IRqzGfvxD0IQeuqQtLt8hkKUCGR9QlPuP5Gng/xlw1W0OzqnabNQ5dRFKff4D3K0YuUiEHQ3QauNrRlfAk8LI4fIq4dKs/VAcBvFPLPx04J7gBS56MbTZC1sFmKOjRs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739233786; c=relaxed/simple; bh=TMgXkr3cTJRM3MaW/W4X97Rj0sxwJzv7gAxKX00QO1Y=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=HDIdP9XWjoo78VVPsbIFOp4htaQS4rIop0RipvhCcFVByK3Th+j8knk5lpV3bYE20Txq2vOQhlIIoIF8TeLCeAonUKDy8u/UykILaTGqjOfo6LvFQ9LUC1AvXmvkQTAT+f9xfMfUlTug6UPyhEI+JtlshfpQw25bkr/Qy+HCtwk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=AXimKAQK; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="AXimKAQK" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 08730C4CED1; Tue, 11 Feb 2025 00:29:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1739233785; bh=TMgXkr3cTJRM3MaW/W4X97Rj0sxwJzv7gAxKX00QO1Y=; h=From:To:Cc:Subject:Date:From; b=AXimKAQK8gtKAqF7lap7m+Ntcb4qLWi68dQxwb0HERhJcKUxpSG2D5D7e2JKqrRbL OydQbSj9RgWKPQxirB4rLTsB4mH7IYirz2Dmg1OAf6yfRP895vtTSq/drXwSP4W3xA Z3T51AMKiOjD2UrpaaROYee4snilkqPvtzos/YW/u/fjlrpTWyRPY5c25mgApK/+UR vmAcESqUeOn5VaX6uRnNFXh0D0RDt2dLCo3L1B8cr4aQ4ciG2R/Bujqimt5gHKU6QF 3CgihS2mwyoFgYEPrSCuzSZ2lvstbbZwAKac3ZMm0W8AeSUQA1DZkaWPXevsH0tHPT g59OqFsgfFHgQ== From: Masahiro Yamada To: Frank Binns , Matt Coster Cc: linux-kernel@vger.kernel.org, Masahiro Yamada , Arnaldo Carvalho de Melo , Borislav Petkov , Nathan Chancellor , Nicolas Schier , bpf@vger.kernel.org, linux-kbuild@vger.kernel.org Subject: [PATCH] tools: fix annoying "mkdir -p ..." logs when building tools in parallel Date: Tue, 11 Feb 2025 09:29:06 +0900 Message-ID: <20250211002930.1865689-1-masahiroy@kernel.org> X-Mailer: git-send-email 2.43.0 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" When CONFIG_OBJTOOL=3Dy or CONFIG_DEBUG_INFO_BTF=3Dy, parallel builds show awkward "mkdir -p ..." logs. $ make -j16 [ snip ] mkdir -p /home/masahiro/ref/linux/tools/objtool && make O=3D/home/masahir= o/ref/linux subdir=3Dtools/objtool --no-print-directory -C objtool mkdir -p /home/masahiro/ref/linux/tools/bpf/resolve_btfids && make O=3D/h= ome/masahiro/ref/linux subdir=3Dtools/bpf/resolve_btfids --no-print-directo= ry -C bpf/resolve_btfids Defining MAKEFLAGS=3D on the command line wipes out command line switches from the resultant MAKEFLAGS definition, even though the command line switches are active. [1] The first word of $(MAKEFLAGS) is a possibly empty group of characters representing single-letter options that take no argument. However, this breaks if MAKEFLAGS=3D is given on the command line. The tools/ and tools/% targets set MAKEFLAGS=3D on the command line, which breaks the following code in tools/scripts/Makefile.include: short-opts :=3D $(firstword -$(MAKEFLAGS)) If MAKEFLAGS really needs modification, it should be done through the environment variable, as follows: MAKEFLAGS=3D $(MAKE) ... That said, I question whether modifying MAKEFLAGS is necessary here. The only flag we might want to exclude is --no-print-directory, as the tools build system changes the working directory. However, people might find the "Entering/Leaving directory" logs annoying. I simply removed the offending MAKEFLAGS=3D. [1]: https://savannah.gnu.org/bugs/?62469 Fixes: a50e43332756 ("perf tools: Honor parallel jobs") Signed-off-by: Masahiro Yamada Tested-by: Daniel Xu --- Makefile | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-) diff --git a/Makefile b/Makefile index 89628e354ca7..52207bcb1a9d 100644 --- a/Makefile +++ b/Makefile @@ -1421,18 +1421,13 @@ ifneq ($(wildcard $(resolve_btfids_O)),) $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=3D$(resolve_btfids_= O) clean endif =20 -# Clear a bunch of variables before executing the submake -ifeq ($(quiet),silent_) -tools_silent=3Ds -endif - tools/: FORCE $(Q)mkdir -p $(objtree)/tools - $(Q)$(MAKE) LDFLAGS=3D MAKEFLAGS=3D"$(tools_silent) $(filter --j% -j,$(MA= KEFLAGS))" O=3D$(abspath $(objtree)) subdir=3Dtools -C $(srctree)/tools/ + $(Q)$(MAKE) LDFLAGS=3D O=3D$(abspath $(objtree)) subdir=3Dtools -C $(srct= ree)/tools/ =20 tools/%: FORCE $(Q)mkdir -p $(objtree)/tools - $(Q)$(MAKE) LDFLAGS=3D MAKEFLAGS=3D"$(tools_silent) $(filter --j% -j,$(MA= KEFLAGS))" O=3D$(abspath $(objtree)) subdir=3Dtools -C $(srctree)/tools/ $* + $(Q)$(MAKE) LDFLAGS=3D O=3D$(abspath $(objtree)) subdir=3Dtools -C $(srct= ree)/tools/ $* =20 # ------------------------------------------------------------------------= --- # Kernel selftest --=20 2.43.0