From mboxrd@z Thu Jan 1 00:00:00 1970 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 ACDB6186E58; Fri, 2 Jan 2026 06:59:35 +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=1767337176; cv=none; b=NyfnD/ybUBVsxCBV0lRVZ/AkY5fJ/uBL0wXiQ4utIXLmHQ3Ws1TAJz94MTSZAc0dEjRqFUp/86PU5U6NL84dGz+Ly8YB+xqriR6qHGP5Xar7ITi+lQkrej0oZaN05HLAK0G+Nd59YN+vcxaxDQLlForVNi0nDY4zPnTCvaKT2aU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767337176; c=relaxed/simple; bh=6UamW9ypeYvnLArvWXDR1zXy9G1XczNWSIs66XcI5UY=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=JILajEJeZ35MRLyMg7Iw0q+IpK4NlAevAUYR+NtsUQHsxl5tORiTn6hhbxSBkuBqg0qGKIcwyXY9u7IwTHEmL3BzB7mLspJyK+U8mnn4ZyRITrANbJ7LTsH5OKh2cP6mc5dr7G0DnBZkdbDVoTtC1iLJBXqrDAT8Ygd/3FZWYLU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=JURDexdX; 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="JURDexdX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 09B4AC116B1; Fri, 2 Jan 2026 06:59:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1767337175; bh=6UamW9ypeYvnLArvWXDR1zXy9G1XczNWSIs66XcI5UY=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=JURDexdXezRaYfVCWbUaXW3lzvXlm31RIqEgAxJWeFjD7mvppUL+nB5Q6DW/syoE7 9KCN3XX0+IFrZ6lXHKvj23Zbubf1juMpQoyVR3R5K+W0wTXoTePytdymIvKf7/FuUt b7F7Op6aP4W0iuoMzjx2QqloKghcV05PUK7YhWlqmCDHRezSFJ5+E+XxOvd9U94KrO yMpXKhnr9xm6zugptlmyDIWLkIzbYaeb0b/lyAP5EPPZjPoSkHAZCyI/7qGe07Bh3c ZF/OMYqQXU+WaQeAzqytLFSZafleWXTxSNL1jQdGV6O5YweZiL0UFX3Jm+OycztA8g kFuOhUi2qJ56g== Date: Fri, 2 Jan 2026 08:59:12 +0200 From: Mike Rapoport To: Andrew Morton Cc: Alex Shi , Alexander Gordeev , Andreas Larsson , Borislav Petkov , Brian Cain , "Christophe Leroy (CS GROUP)" , Catalin Marinas , "David S. Miller" , Dave Hansen , David Hildenbrand , Dinh Nguyen , Geert Uytterhoeven , Guo Ren , Heiko Carstens , Helge Deller , Huacai Chen , Ingo Molnar , Johannes Berg , John Paul Adrian Glaubitz , Jonathan Corbet , "Liam R. Howlett" , Lorenzo Stoakes , Magnus Lindholm , Matt Turner , Max Filippov , Michael Ellerman , Michal Hocko , Michal Simek , Muchun Song , Oscar Salvador , Palmer Dabbelt , Pratyush Yadav , Richard Weinberger , Russell King , Stafford Horne , Suren Baghdasaryan , Thomas Bogendoerfer , Thomas Gleixner , Vasily Gorbik , Vineet Gupta , Vlastimil Babka , Will Deacon , x86@kernel.org, linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-cxl@vger.kernel.org, linux-doc@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, linux-openrisc@vger.kernel.org, linux-parisc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-um@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, loongarch@lists.linux.dev, sparclinux@vger.kernel.org Subject: Re: [PATCH 00/28] arch, mm: consolidate hugetlb early reservation Message-ID: References: <20251228124001.3624742-1-rppt@kernel.org> <20251231172714.a7fe44e856c14fdc8fe1cb43@linux-foundation.org> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251231172714.a7fe44e856c14fdc8fe1cb43@linux-foundation.org> On Wed, Dec 31, 2025 at 05:27:14PM -0800, Andrew Morton wrote: > On Sun, 28 Dec 2025 14:39:30 +0200 Mike Rapoport wrote: > > > Order in which early memory reservation for hugetlb happens depends on > > architecture, on configuration options and on command line parameters. > > > > Some architectures rely on the core MM to call hugetlb_bootmem_alloc() > > while others call it very early to allow pre-allocation of HVO-style > > vmemmap. > > > > When hugetlb_cma is supported by an architecture it is initialized during > > setup_arch() and then later hugetlb_init code needs to understand did it > > happen or not. > > > > To make everything consistent and unified, both reservation of hugetlb > > memory from bootmem and creation of CMA areas for hugetlb must be called > > from core MM initialization and it would have been a simple change. > > However, HVO-style pre-initialization ordering requirements slightly > > complicate things and for HVO pre-init to work sparse and memory map should > > be initialized after hugetlb reservations. > > > > This required pulling out the call to free_area_init() out of setup_arch() > > path and moving it MM initialization and this is what the first 23 patches > > do. > > > > These changes are deliberately split into per-arch patches that change how > > the zone limits are calculated for each architecture and the patches 22 and > > 23 just remove the calls to free_area_init() and sprase_init() from arch/*. > > > > Patch 24 is a simple cleanup for MIPS. > > > > Patches 25 and 26 actually consolidate hugetlb reservations and patches 27 > > and 28 perform some aftermath cleanups. > > Thanks for the diligence - this can't have been the most exciting thing > to work on! > > > I tried to trim the distribution list and although it's still quite long > > if you feel that someone was wrongly excluded please add them back. > > I'll add these to mm.git's mm-new branch for some testing. I'll > suppress the usual email storm because 41 * 28 is a lot of emails ;) kbuild reported failures on some configurations so I'm anyway going to send a lot of emails for v2 :) -- Sincerely yours, Mike.