From nobody Sun Feb 8 11:44:55 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 3087F31771B; Sun, 11 Jan 2026 08:23:39 +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=1768119820; cv=none; b=PnznZ8HspZch7rGC9sT+HdnY/hC3ZR43QHrnCTKXKppvPZbFwe/onaS3SoAAAUEra4qEuBFGdFvNSC3XtoSl30U1aFM6F7lllvITLWX6U9FIMLbo0tAfPidb/Lyl+lKuv2R8FOEj+9LMIIyIVULhyVWp1ukvqPiGx7u1aBdBZvQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768119820; c=relaxed/simple; bh=qGV3crV7vYfN1DCsmhF37VWmOXuApg3MmNmGXJVotqE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hysRfwDMTVXirb1mLmXqCLpGuh91pQvPl23KvpMuzpgh0UA8qFhm3fcN+OPUMIucUMLNlM99kDWZmRrY6SUGrTuNwzdsBcnaDapKDHO37OkdvzXJHQzFRVtrxVpw8BVeJKaM7Q0qjktycJp5Ivk90kVr6HdV8hYKw0iD/w8HD8E= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=fxotzz0k; 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="fxotzz0k" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 41A52C4CEF7; Sun, 11 Jan 2026 08:23:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768119819; bh=qGV3crV7vYfN1DCsmhF37VWmOXuApg3MmNmGXJVotqE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fxotzz0k2KwCNp5gWh6cgEcUYH8E0BhaEKKXTdT2pUdivBywvI4T+qXqHxIZASCzv 1gDvHJBccnnzMaLHh7DBlSuaqDoWKk743xL7Oou07E6HNfZWS0zPTWLM4rs5OOguuo GUAoxRtqYBs/qxZg0L3WKkhSzJKWvFzo7bwsjWtl2FO4jLNuQVwJYrxBJFZgt1ghP2 0kdmI1lYTpCBQUUqGWKOjqYFpVyhQUuN851OKnj8uy6V7dRr5kMl9pPSzvbRlL8i0d I2u0gSIfQN5q/tcK4hqFkCMxPsVumAIFJF5vuk9i0Tc/89H6zAhA9SuDwA9yercaDb vOxbNKYOZaN5w== 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 , Klara Modin , "Liam R. Howlett" , Lorenzo Stoakes , Magnus Lindholm , Matt Turner , Max Filippov , Michael Ellerman , Michal Hocko , Michal Simek , Mike Rapoport , Muchun Song , Oscar Salvador , Palmer Dabbelt , Pratyush Yadav , Richard Weinberger , Ritesh Harjani , 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: [PATCH v3 09/29] m68k: introduce arch_zone_limits_init() Date: Sun, 11 Jan 2026 10:20:43 +0200 Message-ID: <20260111082105.290734-10-rppt@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260111082105.290734-1-rppt@kernel.org> References: <20260111082105.290734-1-rppt@kernel.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" From: "Mike Rapoport (Microsoft)" Move calculations of zone limits to a dedicated arch_zone_limits_init() function. Later MM core will use this function as an architecture specific callback during nodes and zones initialization and thus there won't be a need to call free_area_init() from every architecture. Since all variants of m68k add all memory to ZONE_DMA, it is possible to use unified implementation for arch_zone_limits_init() that sets the end of ZONE_DMA to memblock_end_of_DRAM(). Signed-off-by: Mike Rapoport (Microsoft) --- arch/m68k/mm/init.c | 7 ++++++- arch/m68k/mm/mcfmmu.c | 2 +- arch/m68k/mm/motorola.c | 2 +- arch/m68k/mm/sun3mmu.c | 2 +- 4 files changed, 9 insertions(+), 4 deletions(-) diff --git a/arch/m68k/mm/init.c b/arch/m68k/mm/init.c index 488411af1b3f..6b1d9d2434b5 100644 --- a/arch/m68k/mm/init.c +++ b/arch/m68k/mm/init.c @@ -40,6 +40,11 @@ void *empty_zero_page; EXPORT_SYMBOL(empty_zero_page); =20 +void __init arch_zone_limits_init(unsigned long *max_zone_pfns) +{ + max_zone_pfns[ZONE_DMA] =3D PFN_DOWN(memblock_end_of_DRAM()); +} + #ifdef CONFIG_MMU =20 int m68k_virt_to_node_shift; @@ -69,7 +74,7 @@ void __init paging_init(void) high_memory =3D (void *) end_mem; =20 empty_zero_page =3D memblock_alloc_or_panic(PAGE_SIZE, PAGE_SIZE); - max_zone_pfn[ZONE_DMA] =3D end_mem >> PAGE_SHIFT; + arch_zone_limits_init(max_zone_pfn); free_area_init(max_zone_pfn); } =20 diff --git a/arch/m68k/mm/mcfmmu.c b/arch/m68k/mm/mcfmmu.c index 19a75029036c..24a6f7bbd1ce 100644 --- a/arch/m68k/mm/mcfmmu.c +++ b/arch/m68k/mm/mcfmmu.c @@ -73,7 +73,7 @@ void __init paging_init(void) } =20 current->mm =3D NULL; - max_zone_pfn[ZONE_DMA] =3D PFN_DOWN(_ramend); + arch_zone_limits_init(max_zone_pfn); free_area_init(max_zone_pfn); } =20 diff --git a/arch/m68k/mm/motorola.c b/arch/m68k/mm/motorola.c index 62283bc2ed79..d6ccd23caf61 100644 --- a/arch/m68k/mm/motorola.c +++ b/arch/m68k/mm/motorola.c @@ -517,6 +517,6 @@ void __init paging_init(void) if (node_present_pages(i)) node_set_state(i, N_NORMAL_MEMORY); =20 - max_zone_pfn[ZONE_DMA] =3D memblock_end_of_DRAM(); + arch_zone_limits_init(max_zone_pfn); free_area_init(max_zone_pfn); } diff --git a/arch/m68k/mm/sun3mmu.c b/arch/m68k/mm/sun3mmu.c index 1ecf6bdd08bf..fdd69cc4240c 100644 --- a/arch/m68k/mm/sun3mmu.c +++ b/arch/m68k/mm/sun3mmu.c @@ -82,7 +82,7 @@ void __init paging_init(void) current->mm =3D NULL; =20 /* memory sizing is a hack stolen from motorola.c.. hope it works for us= */ - max_zone_pfn[ZONE_DMA] =3D ((unsigned long)high_memory) >> PAGE_SHIFT; + arch_zone_limits_init(max_zone_pfn); =20 /* I really wish I knew why the following change made things better... -= - Sam */ free_area_init(max_zone_pfn); --=20 2.51.0