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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 72DD4EC01A5 for ; Mon, 23 Mar 2026 08:49:20 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 5F6736B0005; Mon, 23 Mar 2026 04:49:19 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 5CD7C6B0088; Mon, 23 Mar 2026 04:49:19 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4E3CA6B0089; Mon, 23 Mar 2026 04:49:19 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id 3E7F46B0005 for ; Mon, 23 Mar 2026 04:49:19 -0400 (EDT) Received: from smtpin22.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id 7E9DC1B8F20 for ; Mon, 23 Mar 2026 08:49:18 +0000 (UTC) X-FDA: 84576703596.22.DC9E0D2 Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf15.hostedemail.com (Postfix) with ESMTP id E4E8EA0006 for ; Mon, 23 Mar 2026 08:49:16 +0000 (UTC) Authentication-Results: imf15.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=QAcTk4zT; spf=pass (imf15.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1774255756; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=gzHVV/snRVT3xSp7+iZyrt5RenaPsY5kBShH+YWbrEM=; b=5G4r9f0J6znH7YLmkSklRLaO98V9FLXFBpDrcaNDxZ2UHF0JCABZU1hmdC7mNKdQR7NHDG Rl00au/kLsj55/Ano3P/s5G+N7wBmvYRR6Gnqwrnl+iX0APOER+a4lR2mcQGLk73v8x197 sb7p+cKYAS8uUeGLumswfe5RGA+ar0A= ARC-Authentication-Results: i=1; imf15.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=QAcTk4zT; spf=pass (imf15.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1774255756; a=rsa-sha256; cv=none; b=zIa2uOAhlkcxij86N41TTQk01TFbWTR7NJJuwYXqf3oJKp36dYpW8nmaAZDEvDCbnih/Eb j23+g/TsrpCtI9WQBJQMwUhfztbtlspPl0cmK2kn3pG/+yAxtK9Suxjm9DUDQCaMIS0gxS WCCNRIteuD7rdZ189m0bUb4kHJbkK8Y= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 426CC60051; Mon, 23 Mar 2026 08:49:16 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 61046C4CEF7; Mon, 23 Mar 2026 08:49:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774255756; bh=DZF/jGQWrlgdVsuqiaHeoRfMY53sc41gnfhL+qN9Jjo=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=QAcTk4zTb8b194gajG4acCAncrYK7ufNrmC8eZSvuFkEWYUKm/lkN/1L3B68vW+nX 6vMCwhVFH6BvDWe9HEZWJrXLiOB7V0mUNJRQz6w84Eq/IEUD1RiBLfIM8C6x8z46i/ wUGu1cGmH7Vq8Itfo92SF393/jsvzOMqx+cfLlq/9zDQfuydMjc1XGiCbal7NBOaKg bv8YSpBs9h+Yf3WNyJaE/61CcybP+Mc8xw8g4/9ojFi3unijlmqWvrf2gY7b6uKvfe PC9xrL6LmY3h2g/+O3uZwkSGSEcLDercf9YzDUhngS13/8iMVOPUl6o66YW9+z3oP3 tdr+FccQyc6+A== Message-ID: <6b04c1a1-74e7-42e8-8523-a40802e5dacc@kernel.org> Date: Mon, 23 Mar 2026 09:49:11 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 13/15] mm/sparse: move sparse_init_one_section() to internal.h To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Oscar Salvador , Axel Rasmussen , Yuanchu Xie , Wei Xu , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Sidhartha Kumar , linux-mm@kvack.org, linux-cxl@vger.kernel.org, linux-riscv@lists.infradead.org References: <20260320-sparsemem_cleanups-v2-0-096addc8800d@kernel.org> <20260320-sparsemem_cleanups-v2-13-096addc8800d@kernel.org> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzS5EYXZpZCBIaWxk ZW5icmFuZCAoQ3VycmVudCkgPGRhdmlkQGtlcm5lbC5vcmc+wsGQBBMBCAA6AhsDBQkmWAik AgsJBBUKCQgCFgICHgUCF4AWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaYJt/AIZAQAKCRBN 3hD3AP+DWriiD/9BLGEKG+N8L2AXhikJg6YmXom9ytRwPqDgpHpVg2xdhopoWdMRXjzOrIKD g4LSnFaKneQD0hZhoArEeamG5tyo32xoRsPwkbpIzL0OKSZ8G6mVbFGpjmyDLQCAxteXCLXz ZI0VbsuJKelYnKcXWOIndOrNRvE5eoOfTt2XfBnAapxMYY2IsV+qaUXlO63GgfIOg8RBaj7x 3NxkI3rV0SHhI4GU9K6jCvGghxeS1QX6L/XI9mfAYaIwGy5B68kF26piAVYv/QZDEVIpo3t7 /fjSpxKT8plJH6rhhR0epy8dWRHk3qT5tk2P85twasdloWtkMZ7FsCJRKWscm1BLpsDn6EQ4 jeMHECiY9kGKKi8dQpv3FRyo2QApZ49NNDbwcR0ZndK0XFo15iH708H5Qja/8TuXCwnPWAcJ DQoNIDFyaxe26Rx3ZwUkRALa3iPcVjE0//TrQ4KnFf+lMBSrS33xDDBfevW9+Dk6IISmDH1R HFq2jpkN+FX/PE8eVhV68B2DsAPZ5rUwyCKUXPTJ/irrCCmAAb5Jpv11S7hUSpqtM/6oVESC 3z/7CzrVtRODzLtNgV4r5EI+wAv/3PgJLlMwgJM90Fb3CB2IgbxhjvmB1WNdvXACVydx55V7 LPPKodSTF29rlnQAf9HLgCphuuSrrPn5VQDaYZl4N/7zc2wcWM7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: <20260320-sparsemem_cleanups-v2-13-096addc8800d@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Queue-Id: E4E8EA0006 X-Rspamd-Server: rspam08 X-Stat-Signature: uy6d4ooxs6o8a8d6xpwtf15pu1zi691k X-HE-Tag: 1774255756-398935 X-HE-Meta: U2FsdGVkX1+eDg/wL4VvUty4vZteVq6M+Yc1J8OhfvEpuBX5eosjGcSdPHtC8RtA9FQz1vr7E3kNi3SQJR6p3X6T1BmTOLp7FCLpo82EBQwbLwD07QaA49StxF4baDL4mWB389S0Bg++hR5kZWHANrWGILjiF5oOWzFPOXN7X7d1abFxffvFL204nXX8P4yMDFYzKstTK2yw4lH8ti1OjT6sLD2WKZcmlKP3mOB6wuyOXFx1M1qFI7+Et9EHK+hzQs3wlpO5n9BqXrg9Dom4muY2+cdh1JxxwrKfWSD/n2pzDimTyAUaka+N8N1Ha89FrhyWLy1jfzBiNYCob9Ata+TXuoQjktSwL1uy7lKdojr+1bYssodXlQFcrrtpJ8z8TBHfLXXMAsF68tMiUx64tU6zg8BOZ5glELEgZBR/iQ1p0abpQgapCRuBqqSsNY+mXDgAwtXFvOVZObysNN/pN+Iwqy+EtP3bcyEhV9LA8jIeNVJYNDuUmo7Z2rE5of+wJ2f13NbkesAEhSA15YfLOV14UIwO5RtKTEbKsILza0ywJuhACVkmSLsP8ln6XLaoyOJ1+5dqrj4crjvrmo80+arLZIZqvIe63GR3Tbcl3W3CejpnEpRvV2LhYRcaceZbRigUl2wZ5l8ZttdVR1PUXVXZTBNYhQjvv9hKj2vYnLnDjqRTHnSipkBKSRO/XxeHyXVPXKlZnD74B2Hqd6orY0Oby0XTmcwDjFHGEUgffvBJ8X+3D8rim00Q7yToANycgOrGdlH/I0QizupcaBZPsFgSJjlf5KvF96sYetPOi+ZSYOJnB5R4LrMndKAWlP54H6MzVtpILsUURyq/M91QwnW741KFjQGQEd+EAaWa4i1B7kEZpAXDfP11+zPm2CrR+etJO6iaN0IpztJIRcZizdnhloQuKiUvmFvsuPuQOLUNf0AlKVd0ng9kD9Q6/nPv Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 3/20/26 23:13, David Hildenbrand (Arm) wrote: > While at it, convert the BUG_ON to a VM_WARN_ON_ONCE, avoid long lines, and > merge sparse_encode_mem_map() into its only caller > sparse_init_one_section(). > > Clarify the comment a bit, pointing at page_to_pfn(). > > Reviewed-by: Lorenzo Stoakes (Oracle) > Reviewed-by: Mike Rapoport (Microsoft) > Signed-off-by: David Hildenbrand (Arm) > --- > include/linux/mmzone.h | 2 +- > mm/internal.h | 22 ++++++++++++++++++++++ > mm/sparse.c | 24 ------------------------ > 3 files changed, 23 insertions(+), 25 deletions(-) > > diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h > index b694c69dee04..dcbbf36ed88c 100644 > --- a/include/linux/mmzone.h > +++ b/include/linux/mmzone.h > @@ -2008,7 +2008,7 @@ struct mem_section { > /* > * This is, logically, a pointer to an array of struct > * pages. However, it is stored with some other magic. > - * (see sparse.c::sparse_init_one_section()) > + * (see sparse_init_one_section()) > * > * Additionally during early boot we encode node id of > * the location of the section here to guide allocation. > diff --git a/mm/internal.h b/mm/internal.h > index 5f5c45d80aca..2f188f7702f7 100644 > --- a/mm/internal.h > +++ b/mm/internal.h > @@ -965,6 +965,28 @@ void memmap_init_range(unsigned long, int, unsigned long, unsigned long, > */ > #ifdef CONFIG_SPARSEMEM > void sparse_init(void); > + > +static inline void sparse_init_one_section(struct mem_section *ms, > + unsigned long pnum, struct page *mem_map, > + struct mem_section_usage *usage, unsigned long flags) > +{ > + unsigned long coded_mem_map; > + > + BUILD_BUG_ON(SECTION_MAP_LAST_BIT > PFN_SECTION_SHIFT); > + > + /* > + * We encode the start PFN of the section into the mem_map such that > + * page_to_pfn() on !CONFIG_SPARSEMEM_VMEMMAP can simply subtract it > + * from the page pointer to obtain the PFN. > + */ > + coded_mem_map = (unsigned long)(mem_map - section_nr_to_pfn(pnum)); > + VM_WARN_ON(coded_mem_map & ~SECTION_MAP_MASK); > + > + ms->section_mem_map &= ~SECTION_MAP_MASK; > + ms->section_mem_map |= coded_mem_map; > + ms->section_mem_map |= flags | SECTION_HAS_MEM_MAP; > + ms->usage = usage; The following fixup on top: >From 66ec42c610feb3b84c405222f3f39ba0776549c6 Mon Sep 17 00:00:00 2001 From: "David Hildenbrand (Arm)" Date: Mon, 23 Mar 2026 09:48:21 +0100 Subject: [PATCH] fixup: mm/sparse: move sparse_init_one_section() to internal.h Signed-off-by: David Hildenbrand (Arm) --- mm/internal.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/internal.h b/mm/internal.h index 2f188f7702f7..969e58e5b3db 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -980,7 +980,7 @@ static inline void sparse_init_one_section(struct mem_section *ms, * from the page pointer to obtain the PFN. */ coded_mem_map = (unsigned long)(mem_map - section_nr_to_pfn(pnum)); - VM_WARN_ON(coded_mem_map & ~SECTION_MAP_MASK); + VM_WARN_ON_ONCE(coded_mem_map & ~SECTION_MAP_MASK); ms->section_mem_map &= ~SECTION_MAP_MASK; ms->section_mem_map |= coded_mem_map; -- 2.43.0 -- Cheers, David