From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 D40CD3CFF49; Wed, 9 Sep 2026 14:22:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788963753; cv=none; b=Dh4OWqKEQN8RzmGnUivd6LAR/3GlBulxds+ZE6ZsHT1nwS+08vErq1+QK+mxssXFgCe19Z0+tPPfsXO3KNjXlNHSR66CIi7qLTKNW5jmBis5B5kcFf4r4sMMs3swdJ1R77dzNrNinR7rEu6PDcgRDC3BCyNSmgFkvebI1NPnzuw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788963753; c=relaxed/simple; bh=xhaQtXKXvGz1RizoQa7SuL6Y+tbxk3SF34NiCq25TtY=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=hu41MpNKw//ubixiRiqUpTfZdDjVmhImrcFGIYBzvlKHvUcwiWIZbaR/E6Wq+tYW/HZecHbTv4gOlu/tGiH4bGkEdrhTNGNOHM2g6T6PBV9IwVm1Wh6AWzOH9SlYki0I6Gv8rsJIWkB3EDqw5XtG0ag+IvwIANav76MW/AJZ0B0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=I3WQzUYy; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="I3WQzUYy" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8CED51F00A3A; Wed, 9 Sep 2026 14:22:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788963752; bh=Pk1B8WY2LVSwCYtQsLVOVpVrwdeq2SzwuwcAh4JLsyY=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=I3WQzUYyylKqYJS5qmsgtV4gCaBjFEJYODcC8Ol3i3kBCe2qTrc5wzzZNNy4kF7ij 8pZMcrWK2JFQFt3KXt2LCmR0gY6JjzAAUj7SLD3O44QFr+LDHBDnSGzjJq2i1A5esv WQ/mxgnq/ZIfTB3Sw6DGSX81V+jiVwk3Xg+uc6Vo5k3b/humXMJcjQ/TwY2F+Shm3v R7yFCwfbbcoXINobG4EEvcVgDaAm1bZ5cKxJ84+SXKZqdc4B1YjEjMydoXY9AXcm2x k9tQ6yabRw+huoALoDMWZNBCDcyVj6/awBwzLz7HZAXgAWaQCg/ZJBXt1SzsvNgMI4 IPvSDHhFEdzjQ== Date: Wed, 9 Sep 2026 15:22:17 +0100 From: "Lorenzo Stoakes (ARM)" To: Miguel Ojeda 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 , =?utf-8?B?QmrDtnJu?= Roy Baron , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , Daniel Almeida , Tamir Duberstein , Alexandre Courbot , Onur =?utf-8?B?w5Z6a2Fu?= , Jonathan Corbet , Randy Dunlap , 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 Subject: Re: [PATCH 20/23] kbuild: rust: parallelise rustc front end Message-ID: References: <20260908-build-speedup-v1-0-5dc1ac01672d@kernel.org> <20260908-build-speedup-v1-20-5dc1ac01672d@kernel.org> Precedence: bulk X-Mailing-List: linux-kbuild@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Tue, Sep 08, 2026 at 11:13:04PM +0200, Miguel Ojeda wrote: > On Tue, Sep 8, 2026 at 10:59 PM Lorenzo Stoakes (ARM) wrote: > > > > A future -j/--jobs option is planned for > > rustc:(rust-lang/compiler-team#1005), so check to see if this available and > > if so use it. > > This is already implemented in nightly as far as I can tell. If it > weren't, we shouldn't add it, even if planned. > > (By the way, could you please add Link tags for those URLs?) Ack, will do. > > > +config RUSTC_HAS_JOBS > > + def_bool $(rustc-option,-j8) > > + > > +config RUSTC_HAS_ZTHREADS > > + def_bool $(rustc-option,-Zthreads=8) > > We can simplify using `RUSTC_VERSION` for these like we do elsewhere. Ack also! > > Cheers, > Miguel -- Cheers, Lorenzo 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 F0AF9C79FB7 for ; Wed, 9 Sep 2026 14:22:48 +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=ns2VWDUzhA8FJBk7B583yVzEJowoTqcvVx9SBoOs6FU=; b=CpPZQGUulu+QYO MJylU/xfxTEMuPdSqMDxQDBLOgdXqxK4lnkxEWGpOZTcmGRpG6JvzimJ/o0YqCUi5mkXwnrEZ/RoG uQCPfTEgRN6sRnrsT7BVpk5z2N46i+CKdU7BELm2lO3eXhmhO5Ptq232cbKfYPPPppZzK8vcs3U9L dix/6NuwzyMlfZ+o0gwH0cYsNLYqpbn6UoQasegYx6Or7IwlnohoK+nrF01azv5RP/LHuUfzKSV6R Z/rRCF6u/ve/SqF/resdNIMFMmjqC/qgOveVpivTDV9AMr7kvWc41D0nmQndZNowC5ff8/p8TexH2 AOPuF1XWYIOBpQb6eBTw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x4JC8-0000000BxEn-1qTu; Wed, 09 Sep 2026 14:22:36 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1x4JC5-0000000BxEK-3Att; Wed, 09 Sep 2026 14:22:34 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id C00466020C; Wed, 9 Sep 2026 14:22:32 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8CED51F00A3A; Wed, 9 Sep 2026 14:22:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788963752; bh=Pk1B8WY2LVSwCYtQsLVOVpVrwdeq2SzwuwcAh4JLsyY=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=I3WQzUYyylKqYJS5qmsgtV4gCaBjFEJYODcC8Ol3i3kBCe2qTrc5wzzZNNy4kF7ij 8pZMcrWK2JFQFt3KXt2LCmR0gY6JjzAAUj7SLD3O44QFr+LDHBDnSGzjJq2i1A5esv WQ/mxgnq/ZIfTB3Sw6DGSX81V+jiVwk3Xg+uc6Vo5k3b/humXMJcjQ/TwY2F+Shm3v R7yFCwfbbcoXINobG4EEvcVgDaAm1bZ5cKxJ84+SXKZqdc4B1YjEjMydoXY9AXcm2x k9tQ6yabRw+huoALoDMWZNBCDcyVj6/awBwzLz7HZAXgAWaQCg/ZJBXt1SzsvNgMI4 IPvSDHhFEdzjQ== Date: Wed, 9 Sep 2026 15:22:17 +0100 From: "Lorenzo Stoakes (ARM)" To: Miguel Ojeda 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 , =?utf-8?B?QmrDtnJu?= Roy Baron , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , Daniel Almeida , Tamir Duberstein , Alexandre Courbot , Onur =?utf-8?B?w5Z6a2Fu?= , Jonathan Corbet , Randy Dunlap , 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 Subject: Re: [PATCH 20/23] kbuild: rust: parallelise rustc front end Message-ID: References: <20260908-build-speedup-v1-0-5dc1ac01672d@kernel.org> <20260908-build-speedup-v1-20-5dc1ac01672d@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: 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="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org T24gVHVlLCBTZXAgMDgsIDIwMjYgYXQgMTE6MTM6MDRQTSArMDIwMCwgTWlndWVsIE9qZWRhIHdy b3RlOgo+IE9uIFR1ZSwgU2VwIDgsIDIwMjYgYXQgMTA6NTnigK9QTSBMb3JlbnpvIFN0b2FrZXMg KEFSTSkgPGxqc0BrZXJuZWwub3JnPiB3cm90ZToKPiA+Cj4gPiBBIGZ1dHVyZSAtai8tLWpvYnMg b3B0aW9uIGlzIHBsYW5uZWQgZm9yCj4gPiBydXN0YzoocnVzdC1sYW5nL2NvbXBpbGVyLXRlYW0j MTAwNSksIHNvIGNoZWNrIHRvIHNlZSBpZiB0aGlzIGF2YWlsYWJsZSBhbmQKPiA+IGlmIHNvIHVz ZSBpdC4KPgo+IFRoaXMgaXMgYWxyZWFkeSBpbXBsZW1lbnRlZCBpbiBuaWdodGx5IGFzIGZhciBh cyBJIGNhbiB0ZWxsLiBJZiBpdAo+IHdlcmVuJ3QsIHdlIHNob3VsZG4ndCBhZGQgaXQsIGV2ZW4g aWYgcGxhbm5lZC4KPgo+IChCeSB0aGUgd2F5LCBjb3VsZCB5b3UgcGxlYXNlIGFkZCBMaW5rIHRh Z3MgZm9yIHRob3NlIFVSTHM/KQoKQWNrLCB3aWxsIGRvLgoKPgo+ID4gK2NvbmZpZyBSVVNUQ19I QVNfSk9CUwo+ID4gKyAgICAgICBkZWZfYm9vbCAkKHJ1c3RjLW9wdGlvbiwtajgpCj4gPiArCj4g PiArY29uZmlnIFJVU1RDX0hBU19aVEhSRUFEUwo+ID4gKyAgICAgICBkZWZfYm9vbCAkKHJ1c3Rj LW9wdGlvbiwtWnRocmVhZHM9OCkKPgo+IFdlIGNhbiBzaW1wbGlmeSB1c2luZyBgUlVTVENfVkVS U0lPTmAgZm9yIHRoZXNlIGxpa2Ugd2UgZG8gZWxzZXdoZXJlLgoKQWNrIGFsc28hCgo+Cj4gQ2hl ZXJzLAo+IE1pZ3VlbAoKLS0KQ2hlZXJzLCBMb3JlbnpvCgpfX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fXwpsaW51eC1yaXNjdiBtYWlsaW5nIGxpc3QKbGludXgt cmlzY3ZAbGlzdHMuaW5mcmFkZWFkLm9yZwpodHRwOi8vbGlzdHMuaW5mcmFkZWFkLm9yZy9tYWls bWFuL2xpc3RpbmZvL2xpbnV4LXJpc2N2Cg==