From nobody Sun Feb 8 11:44:56 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 E9A5122AE65; Sun, 11 Jan 2026 08:25:10 +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=1768119911; cv=none; b=KhWBpBSZGoF/7L0thZ2eVyPMJ5nsgk3vH5uXxIHfkoVYuaAd1N4D61UklFlQWTCo46G69dpMPqT754m8f6agwC8DWBmWLDvPoxHjTAL7unUh24iq9xy3X7mCSze2B3NKH3wW4+D0gtcYmYcZD0aPhnxHvCJX5lNV8NzeC0PFSKw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768119911; c=relaxed/simple; bh=XLJkxze/zRljNiS2gjyXo20G7bby5TmrPlX4304F60E=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=EXwBSbVhhzHHr9ckpi0G1LRKfBTbW4Ocz5b2aL1f3EmV3gIhJLl0vS7i2eCJBWKGtv8EoKABOhzw4i+PC4CZVOh/pYUfbcc0RUnEHMiiZ2pXdMY6KGHcvRsSPYmHmwNKWvvpJcw1MGPv/RKwfD6HDLwOo7BZnsCseCY1dJG9du4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=NJT6JCU7; 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="NJT6JCU7" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F417AC4CEF7; Sun, 11 Jan 2026 08:24:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768119910; bh=XLJkxze/zRljNiS2gjyXo20G7bby5TmrPlX4304F60E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NJT6JCU7l1lxqyEUTX5FYSwW/ezRfbB5BhOsON2tIsFgcB6KzvRLR+VnOfjUnNUli 1Df8EMUsXpuMWNMEAA9p52WCryPzuB9RbNl4/dSrDVNn62F060YueIkx8RUqzMLl6f BhWB9bOPubZIrl7G5M3hr3fwWW14Tf1pPvDElI9X6i/zDAFVSfmNKdnay9gRKvt/PL Xp0l0kOl1v0LyjjDmg+r8L2t3wr9KtSAMNHGmCC+QweHEL3NWWYl1TRj4kT+Dh+ak9 au2MTE1nA096UC962hgd53ExdFcUsGJJZA+dyB8GHK3x3h15Sno3iINFa4dPcVEyf+ kN9pkH6svLtFQ== 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 15/29] powerpc: introduce arch_zone_limits_init() Date: Sun, 11 Jan 2026 10:20:49 +0200 Message-ID: <20260111082105.290734-16-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. Signed-off-by: Mike Rapoport (Microsoft) Reviewed-by: Ritesh Harjani (IBM) --- arch/powerpc/mm/mem.c | 22 ++++++++++++---------- 1 file changed, 12 insertions(+), 10 deletions(-) diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c index 3ddbfdbfa941..03c05ec56041 100644 --- a/arch/powerpc/mm/mem.c +++ b/arch/powerpc/mm/mem.c @@ -221,13 +221,23 @@ static int __init mark_nonram_nosave(void) * anyway) will take a first dip into ZONE_NORMAL and get otherwise served= by * ZONE_DMA. */ -static unsigned long max_zone_pfns[MAX_NR_ZONES]; +void __init arch_zone_limits_init(unsigned long *max_zone_pfns) +{ +#ifdef CONFIG_ZONE_DMA + max_zone_pfns[ZONE_DMA] =3D min((zone_dma_limit >> PAGE_SHIFT) + 1, max_l= ow_pfn); +#endif + max_zone_pfns[ZONE_NORMAL] =3D max_low_pfn; +#ifdef CONFIG_HIGHMEM + max_zone_pfns[ZONE_HIGHMEM] =3D max_pfn; +#endif +} =20 /* * paging_init() sets up the page tables - in fact we've already done this. */ void __init paging_init(void) { + unsigned long max_zone_pfns[MAX_NR_ZONES] =3D { 0 }; unsigned long long total_ram =3D memblock_phys_mem_size(); phys_addr_t top_of_ram =3D memblock_end_of_DRAM(); int zone_dma_bits; @@ -259,15 +269,7 @@ void __init paging_init(void) =20 zone_dma_limit =3D DMA_BIT_MASK(zone_dma_bits); =20 -#ifdef CONFIG_ZONE_DMA - max_zone_pfns[ZONE_DMA] =3D min(max_low_pfn, - 1UL << (zone_dma_bits - PAGE_SHIFT)); -#endif - max_zone_pfns[ZONE_NORMAL] =3D max_low_pfn; -#ifdef CONFIG_HIGHMEM - max_zone_pfns[ZONE_HIGHMEM] =3D max_pfn; -#endif - + arch_zone_limits_init(max_zone_pfns); free_area_init(max_zone_pfns); =20 mark_nonram_nosave(); --=20 2.51.0