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mm/sparse: move initialization of section metadata to sparse_metadata_init()

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Let's move the code responsible for initializing sparse metadata (usemap,
memmap) into a helper.  Cleanup the variable while at it (e.g.,
"map_count").

Drop the rather obvious code comments.

No functional change intended.

Link: https://lore.kernel.org/20260921-b4-sparsemem_cleanups-v2-3-54d81d65e125@kernel.org
Signed-off-by: David Hildenbrand (Arm) <david@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Oscar Salvador <osalvador@suse.de>
Reviewed-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Kairui Song <kasong@tencent.com>
Cc: Qi Zheng <qi.zheng@linux.dev>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Barry Song <baohua@kernel.org>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Yuanchu Xie <yuanchu@google.com>
Cc: Wei Xu <weixugc@google.com>
Cc: Baoquan He <baoquan.he@linux.dev>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Brendan Jackman <brendan.jackman@linux.dev>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Rafael J. Wysocki <rafael@kernel.org>
Cc: Danilo Krummrich <dakr@kernel.org>
This commit is contained in:
David Hildenbrand (Arm) 2026-09-21 21:58:55 +02:00 committed by Andrew Morton
parent 89e2b6e3d3
commit d8ab71169c
1 changed files with 22 additions and 21 deletions
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43
mm/sparse.c
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@ -255,38 +255,39 @@ static void __init sparse_init_nid(int nid, unsigned long pnum_begin,
}
}
static void __init sparse_metadata_init(void)
{
unsigned long start_section_nr = first_present_section_nr();
int nid_begin = sparse_early_nid(__nr_to_section(start_section_nr));
unsigned long section_nr, nr_sections = 1;
for_each_present_section_nr(start_section_nr + 1, section_nr) {
const int nid = sparse_early_nid(__nr_to_section(section_nr));
if (nid == nid_begin) {
nr_sections++;
continue;
}
sparse_init_nid(nid_begin, start_section_nr, section_nr, nr_sections);
nid_begin = nid;
start_section_nr = section_nr;
nr_sections = 1;
}
sparse_init_nid(nid_begin, start_section_nr, section_nr, nr_sections);
}
/*
* Allocate the accumulated non-linear sections, allocate a mem_map
* for each and record the physical to section mapping.
*/
void __init sparse_init(void)
{
unsigned long pnum_end, pnum_begin, map_count = 1;
int nid_begin;
if (compound_info_has_mask()) {
VM_WARN_ON_ONCE(!IS_ALIGNED((unsigned long) pfn_to_page(0),
MAX_FOLIO_VMEMMAP_ALIGN));
}
pnum_begin = first_present_section_nr();
nid_begin = sparse_early_nid(__nr_to_section(pnum_begin));
for_each_present_section_nr(pnum_begin + 1, pnum_end) {
int nid = sparse_early_nid(__nr_to_section(pnum_end));
if (nid == nid_begin) {
map_count++;
continue;
}
/* Init node with sections in range [pnum_begin, pnum_end) */
sparse_init_nid(nid_begin, pnum_begin, pnum_end, map_count);
nid_begin = nid;
pnum_begin = pnum_end;
map_count = 1;
}
/* cover the last node */
sparse_init_nid(nid_begin, pnum_begin, pnum_end, map_count);
sparse_metadata_init();
sparse_init_subsection_map();
vmemmap_populate_print_last();
}