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 56AEF3446DA; Tue, 17 Mar 2026 16:57:34 +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=1773766654; cv=none; b=ChvTtayw8fEWHMEKXkoHD6JolzUSD4lWS8sr/Wu/duMamGszC6tTElAbjMARXR2Q92TDa7vPYV2EVuYzoks+7Qb/DVW0wTsFy8WmcdoBsf46zydKGRfFXeIaM786ZyfYRU8SMqvXU1opXrz0OKn6SPX/BnvLZTpgAWEkiFSKYJc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773766654; c=relaxed/simple; bh=3YI8GLSe1tTWHR4VUkgbO+5WHzisOWZuA3eyf8N2TRo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=d5kN8DIbGeXu8ZxV1vR4oGcautmNOZSipwVq1SjfTwWQziOyYGqm3lyikJn782JfUY8WuSz1fN9Bux2eLWIho4ysMOe8nR3mlZymOkBPYAaYMJQv700Estn+AveNLgYfByUb2QT73LTn5OC+lkgo5/uMxaPBhSa6VAI43odVlDI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=h94nBmRa; 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="h94nBmRa" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 91B4CC4CEF7; Tue, 17 Mar 2026 16:57:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773766654; bh=3YI8GLSe1tTWHR4VUkgbO+5WHzisOWZuA3eyf8N2TRo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=h94nBmRa1lj7MKJ7PA9M7CgVzvxBwAAV9TakhLXrNdY2dP5jXSRsFyt3auwxNmXF/ Cmr9K/op+yjMOSFwzQo17jrSDebrH0kymNXGRAQ34hK8tLDjPuvTMqScgg/doAonCy z0QkvfRf2dThbrwJariFkrc3HxzK8XWonH4NsyuKadivtDbb0U3myTcMY+JfZ89/ZW C8SD3Z7dF3dhm68HtC9CwkUO6aD5ufhtfmV4WytNrOrVNohKLEq7dut2Y66Z/PBBDc ImEFj48erS2Yb/wxd/vaw04/8SLSebStL59JVB2WI8UDMUzaYYHFSPQm7AsE65fHiP rvwNFWh8h8AYw== From: "David Hildenbrand (Arm)" To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, linux-cxl@vger.kernel.org, "David Hildenbrand (Arm)" , Andrew Morton , Oscar Salvador , Axel Rasmussen , Yuanchu Xie , Wei Xu , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko Subject: [PATCH 08/14] mm/sparse: remove sparse_decode_mem_map() Date: Tue, 17 Mar 2026 17:56:46 +0100 Message-ID: <20260317165652.99114-9-david@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260317165652.99114-1-david@kernel.org> References: <20260317165652.99114-1-david@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: 8bit section_deactivate() applies to CONFIG_SPARSEMEM_VMEMMAP only. So we can just use pfn_to_page() (after making sure we have the start PFN of the section), and remove sparse_decode_mem_map(). Signed-off-by: David Hildenbrand (Arm) --- include/linux/memory_hotplug.h | 2 -- mm/sparse.c | 16 +--------------- 2 files changed, 1 insertion(+), 17 deletions(-) diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h index e77ef3d7ff73..815e908c4135 100644 --- a/include/linux/memory_hotplug.h +++ b/include/linux/memory_hotplug.h @@ -308,8 +308,6 @@ extern int sparse_add_section(int nid, unsigned long pfn, struct dev_pagemap *pgmap); extern void sparse_remove_section(unsigned long pfn, unsigned long nr_pages, struct vmem_altmap *altmap); -extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, - unsigned long pnum); extern struct zone *zone_for_pfn_range(enum mmop online_type, int nid, struct memory_group *group, unsigned long start_pfn, unsigned long nr_pages); diff --git a/mm/sparse.c b/mm/sparse.c index 636a4a0f1199..2a1f662245bc 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -274,18 +274,6 @@ static unsigned long sparse_encode_mem_map(struct page *mem_map, unsigned long p return coded_mem_map; } -#ifdef CONFIG_MEMORY_HOTPLUG -/* - * Decode mem_map from the coded memmap - */ -struct page *sparse_decode_mem_map(unsigned long coded_mem_map, unsigned long pnum) -{ - /* mask off the extra low bits of information */ - coded_mem_map &= SECTION_MAP_MASK; - return ((struct page *)coded_mem_map) + section_nr_to_pfn(pnum); -} -#endif /* CONFIG_MEMORY_HOTPLUG */ - static void __meminit sparse_init_one_section(struct mem_section *ms, unsigned long pnum, struct page *mem_map, struct mem_section_usage *usage, unsigned long flags) @@ -758,8 +746,6 @@ static void section_deactivate(unsigned long pfn, unsigned long nr_pages, empty = is_subsection_map_empty(ms); if (empty) { - unsigned long section_nr = pfn_to_section_nr(pfn); - /* * Mark the section invalid so that valid_section() * return false. This prevents code from dereferencing @@ -778,7 +764,7 @@ static void section_deactivate(unsigned long pfn, unsigned long nr_pages, kfree_rcu(ms->usage, rcu); WRITE_ONCE(ms->usage, NULL); } - memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); + memmap = pfn_to_page(SECTION_ALIGN_DOWN(pfn)); } /* -- 2.43.0