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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 25F74C88E77 for ; Wed, 16 Sep 2026 01:06:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=J+JgsSOvJ4YtuDRImtwPXYRphf4sq/Prc3m4pwEvrdo=; b=lxecdCTVyl7JXS HcXFsrblc3NWOAxMYTo2bXOhzg4EQKFV2qKt616CFuVj6aAByZ995zyVA71XrljucPvRrg1467ALq fgGPDt0BixMGK84lA+FeHaeXTc3HBEIo0UgALOtZu1mJFd+vUO15BGJWowgU887hY/HU3ZZ4hXkmu WaMDnpuk5D9iXv24JPEfVn6dcZ+My1slndjmeM/b2UuRft1buVhPGlA+9cwLsfrUnOrC3FaLPPpZV v0gwMCU0hTThSC71xVRn7D9bBzkOwrJie/EfVkZg7zjfU+6G52HXfsTP47yv091yw2eXbnSZukQts I8fPdjN5xb4EbaYnvmGg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x6e6C-000000088rB-33Wv; Wed, 16 Sep 2026 01:06:10 +0000 Received: from tor.source.kernel.org ([2600:3c04:e001:324:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1x6e6B-000000088qx-1VGx; Wed, 16 Sep 2026 01:06:07 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 0B59260142; Wed, 16 Sep 2026 01:06:06 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A75431F00898; Wed, 16 Sep 2026 01:06:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789520765; bh=XvgNiNkqBk6+kkXqTrzqW7sJYsvtakfLRPDEyhDg7Hw=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=AH7a/Zx22fCnj33kUljdAwOHOUB6dl3lKvMgl39S8dfLFFpjmDAaW7aDoy2lCXff3 Zo5MdcsT9MVBmf7RLpdu82PWxH+JojNmdB3QU8us1QpIAD7fzrNCMEQUBFDPoCmVVH v64SNvGRvvxsBLc8xfHi2oNua4PEqxDdKLcX3VVlpXjL4N84lDvzPXSLk1zwfUBqDC nmtEMH2BW2uTaL8N30L/XGO7Tufc7TIYAa1z299zYRAmx4fX0IqrXdw2LMtGQGZgiC EmB9ZWdwrChtSsjs57wQqaPMI5KKrLLVc4HWuYUtR+CTCpfaRt9iJx0l0wdcqoCnv+ qCNr4m7E8ofTQ== Date: Tue, 15 Sep 2026 18:06:05 -0700 From: Kees Cook To: "Lorenzo Stoakes (ARM)" Cc: Linus Torvalds , Nathan Chancellor , Nicolas Schier , Nick Desaulniers , Bill Wendling , Justin Stitt , Masahiro Yamada , Alexey Gladkov , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Arnd Bergmann , Catalin Marinas , Will Deacon , Mark Rutland , Ard Biesheuvel , Ilias Apalodimas , Josh Poimboeuf , Peter Zijlstra , Miguel Ojeda , Boqun Feng , Gary Guo , =?iso-8859-1?Q?Bj=F6rn?= Roy Baron , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , Daniel Almeida , Tamir Duberstein , Alexandre Courbot , Onur =?iso-8859-1?Q?=D6zkan?= , Jonathan Corbet , Randy Dunlap , "Gustavo A. R. Silva" , linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, linux-riscv@lists.infradead.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-efi@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-doc@vger.kernel.org, Jens Axboe , linux-hardening@vger.kernel.org Subject: Re: [PATCH v2 21/21] kbuild: use pigz for gzip compression if available Message-ID: <202609151758.BA5732348@keescook> References: <20260914-build-speedup-v2-0-39817ec5db23@kernel.org> <20260914-build-speedup-v2-21-39817ec5db23@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20260914-build-speedup-v2-21-39817ec5db23@kernel.org> X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On Mon, Sep 14, 2026 at 10:22:20AM +0100, Lorenzo Stoakes (ARM) wrote: > diff --git a/Makefile b/Makefile > index 790ef23c5e8a..38c0cdc9f591 100644 > --- a/Makefile > +++ b/Makefile > @@ -561,7 +561,7 @@ PERL = perl > PYTHON3 = python3 > CHECK = sparse > BASH = bash > -KGZIP = gzip > +KGZIP := $(if $(shell command -v pigz 2>/dev/null),pigz,gzip) > KBZIP2 = bzip2 > KLZOP = lzop > LZMA = lzma I had another idea that I think solves both my concerns (limits to parallelism, new surprise users) and your concerns (complexity, single-threaded when needed)... how about: Makefile: KPGZIP := $(if $(shell command -v pigz 2>/dev/null),$(PYTHON3) $(abs_srctree)/scripts/jobserver-exec $(abs_srctree)/scripts/parallel-gzip,gzip) and the same scripts/parallel-gzip: #!/bin/sh exec pigz -p ${PARALLELISM:-1} "$@" And then replace the /boot/ KGZIP uses with KPGZIP. Then we don't need to change modules, config_data, new users, nor cmd_gzip, etc, which all continue to use the regular KGZIP and the "use python" part for the KPGZIP case becomes is a 1-time cost? -Kees -- Kees Cook _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv