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 DAAEDC79FB7 for ; Wed, 9 Sep 2026 13:35:12 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id CF6B76B00A2; Wed, 9 Sep 2026 09:35:11 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id CCDDD6B00A3; Wed, 9 Sep 2026 09:35:11 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C0B7F6B00A4; Wed, 9 Sep 2026 09:35:11 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id A37036B00A2 for ; Wed, 9 Sep 2026 09:35:11 -0400 (EDT) Received: from smtpin13.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay07.hostedemail.com (Postfix) with ESMTP id 38DB116019C for ; Wed, 9 Sep 2026 13:35:11 +0000 (UTC) X-FDA: 85194320022.13.94B3671 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf19.hostedemail.com (Postfix) with ESMTP id 62EC91A0006 for ; Wed, 9 Sep 2026 13:35:09 +0000 (UTC) Authentication-Results: imf19.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=JUrQET7B; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf19.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org ARC-Authentication-Results: i=1; imf19.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=JUrQET7B; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf19.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1788960909; b=yU7t5BGvMFhUGroIqvm79JWmawijvIPTUvRM3xaG3DuJH6Uj/8bOG9e9O3/NVvC44zudp6 2YKBwz8QbnkBZ+7uZftC5ug5OzpMMHhIWeROBf8qrPOO113fRYf4ZO+PCWh/WaJuyZV3u4 CyJmB7IDg9x6fOidplCZ0w7LlA1GvAo= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1788960909; 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=L2v3o67HNQ9aSFqTXVM1jpMn5NU+1i04xE3R5tvtAw4=; b=JK+cTpcQlP7hwloLAKwZrvmPVelwpSm1+onSY47/X4a4Xu74y99wvHa72O/ccrkwU13bNk 3IRbdo9D29b6iNt6L11X7kHuwqlqfQ2Ew+a2qDUDxoWzs4/b7tYjp57oWoz2kfzf0YbdPw qnUlpqW6UsM9HbUSblz/aENbMt3cUCI= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 86093423CD; Wed, 9 Sep 2026 13:35:08 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 87FCA1F00A3D; Wed, 9 Sep 2026 13:34:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788960908; bh=L2v3o67HNQ9aSFqTXVM1jpMn5NU+1i04xE3R5tvtAw4=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=JUrQET7Bpep1u4rw0MKmhd9cfkeICsEyAERFh9SEB3R3M+csy30qdNXfG/4GEdFoe ylt75rtuHgs5B902EEQK9MUSQwl8Jvgpfu87L8ifQaEXVvj2lWEQ2sNq5st4BeYXO6 7AFVLyGoIDL0OR6RE1ecN3f0N7liMpHacZoQ20+8IP0J88ZyM2xcWbh3R8Ek+fVCrQ /IOC4FEn+4dlR9VjLohiYugge0+bl+TbMqGUOgEt+goOdwybo2LG51/wecTCLBMqbX UKc1z3AWRQcg9gA+oBnjs1wQEvXxuzHAsQJ5bIom6NyHIAfadkKPvZyItRyn/yduu5 x32FaRXVOo9OQ== From: "David Hildenbrand (Arm)" Date: Wed, 09 Sep 2026 15:33:01 +0200 Subject: [PATCH 08/12] mm/sparse: move __highest_used_section_nr handling MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260909-b4-sparsemem_cleanups-v1-8-008fc8d579fe@kernel.org> References: <20260909-b4-sparsemem_cleanups-v1-0-008fc8d579fe@kernel.org> In-Reply-To: <20260909-b4-sparsemem_cleanups-v1-0-008fc8d579fe@kernel.org> To: Andrew Morton , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Kairui Song , Qi Zheng , Shakeel Butt , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , Baoquan He , Baolin Wang , Brendan Jackman , Johannes Weiner , Zi Yan , Oscar Salvador , Greg Kroah-Hartman , "Rafael J. Wysocki" , Danilo Krummrich , Jan Kiszka , Kieran Bingham Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-cxl@vger.kernel.org, driver-core@lists.linux.dev, linux-fsdevel@vger.kernel.org, "David Hildenbrand (Arm)" X-Mailer: b4 0.16.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2321; i=david@kernel.org; h=from:subject:message-id; bh=ifd00cyRI1HuxOcc2xxWxJxbUrmoY4ieu/5tTBcNKZc=; b=owGbwMvMwCF2/OVpCdfQ3ZWMp9WSGLIWJhj/9Ny1KDloarDGVa1TGt0r2+dIpR+efCbvRNIKL bfLL/nlOkpZGMQ4GGTFFFmCgu8bvHy5rrbajY8ZZg4rE8gQBi5OAZhI7jxGhvXvpFgXTC59Y6Tj FHXihcBi00OJWlFqnZdOrNI6IaKxpoSR4c/7iSYTvC+Glr0wsct6bm6/8hnnuY4O6bVr31hNFeG fygkA X-Developer-Key: i=david@kernel.org; a=openpgp; fpr=1BD9CAAD735C4C3A460DFCCA4DDE10F700FF835A X-Rspam-User: X-Rspamd-Queue-Id: 62EC91A0006 X-Stat-Signature: 5zxq7jmqmsa536mrh3johusqexmcrmpm X-Rspamd-Server: rspam01 X-HE-Tag: 1788960909-461917 X-HE-Meta: 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 JkizDOqT kd2wgTNVfs6J7cthtOYe2rLHMGYjINER/C+1nrBdS4JxKX+tmL0/jgq23unR62gDc25iQqMZoEi0m3b7/7TxQlVRBhou+pC6E6N0eYHvaSe3p3l+6StddGWFbHnRIz06ZNbJG5oqHEUssfZmFBzhIXayiRIinc3YQT/bvvTOmbhC9AUdp0k0IsYD7EpfpuAAUnYjHsZ3Yljrwhx2cX1Moaitkgep2+X2hCwgTSLTepIi7tTtO/b5+2s/jYl9KzaFdehOH56TmGO/IGRh/TyoZrqFd4lsLrrzAKnVY5tJn+Rlq8rGsNDPt4hKCj2pva18d562fu+QNexGUVEI= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Let's move it to sparse_init_one_section(). However, to keep early boot processing working, we also have to initialize it in sparse_sections_init(). Should we use READ_ONCE/WRITE_ONCE with __highest_used_section_nr? Probably, something for another day. Signed-off-by: David Hildenbrand (Arm) --- mm/sparse.c | 5 +++-- mm/sparse.h | 6 +++--- 2 files changed, 6 insertions(+), 5 deletions(-) diff --git a/mm/sparse.c b/mm/sparse.c index 2b41ae36f20b8..2d0f2db34f4cf 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -177,7 +177,7 @@ static inline unsigned long first_present_section_nr(void) void __init sparse_sections_init(void) { - unsigned long pfn, start_pfn, end_pfn; + unsigned long pfn, start_pfn, end_pfn, section_nr; int i, nid; sparse_extreme_init(); @@ -187,9 +187,9 @@ void __init sparse_sections_init(void) mminit_validate_memmodel_limits(&start_pfn, &end_pfn); for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { - unsigned long section_nr = pfn_to_section_nr(pfn); struct mem_section *ms; + section_nr = pfn_to_section_nr(pfn); sparse_index_init(section_nr, nid); ms = __nr_to_section(section_nr); if (ms->section_mem_map) @@ -201,6 +201,7 @@ void __init sparse_sections_init(void) __section_mark_present(ms, section_nr); } } + __highest_used_section_nr = section_nr; } #ifndef CONFIG_SPARSEMEM_VMEMMAP diff --git a/mm/sparse.h b/mm/sparse.h index 7c5d82ceb7142..a3af4967fd5c5 100644 --- a/mm/sparse.h +++ b/mm/sparse.h @@ -97,6 +97,9 @@ static inline void sparse_init_one_section(struct mem_section *ms, BUILD_BUG_ON(SECTION_MAP_LAST_BIT > PFN_SECTION_SHIFT); + if (section_nr > __highest_used_section_nr) + __highest_used_section_nr = section_nr; + /* * 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 @@ -114,9 +117,6 @@ static inline void sparse_init_one_section(struct mem_section *ms, static inline void __section_mark_present(struct mem_section *ms, unsigned long section_nr) { - if (section_nr > __highest_used_section_nr) - __highest_used_section_nr = section_nr; - ms->section_mem_map |= SECTION_MARKED_PRESENT; } -- 2.43.0