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mm/mm_init: defer sparse_init() until after zone initialization

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free_area_init() is responsible for initializing pgdat and zone state. 
Calling sparse_init() from there mixes in later vmemmap and struct page
setup, which makes the initialization flow less clear.

Defer sparse_init(), sparse_vmemmap_init_nid_late(), and memmap_init()
until after free_area_init() completes, when zone initialization is fully
done.  This keeps free_area_init() focused on zone setup and ensures that
sparse_init() runs with the relevant zone state already available.

This is also a prerequisite for later hugetlb vmemmap changes that need
zone information during early sparse vmemmap setup.

Link: https://lore.kernel.org/20260612035903.2468601-9-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: Oscar Salvador (SUSE) <osalvador@kernel.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Frank van der Linden <fvdl@google.com>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: "Ritesh Harjani (IBM)" <ritesh.list@gmail.com>
Cc: Usama Arif <usama.arif@linux.dev>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Muchun Song
2026-06-12 11:58:52 +08:00
committed by Andrew Morton
parent 8e4ee7b1bd
commit ee6192a2c4
1 changed files with 7 additions and 5 deletions
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12
mm/mm_init.c
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@@ -1821,7 +1821,6 @@ static void __init free_area_init(void)
bool descending;
arch_zone_limits_init(max_zone_pfn);
sparse_init();
start_pfn = PHYS_PFN(memblock_start_of_DRAM());
descending = arch_has_descending_max_zone_pfns();
@@ -1910,11 +1909,7 @@ static void __init free_area_init(void)
}
}
for_each_node_state(nid, N_MEMORY)
sparse_vmemmap_init_nid_late(nid);
calc_nr_kernel_pages();
memmap_init();
/* disable hash distribution for systems with a single node */
fixup_hashdist();
@@ -2686,10 +2681,17 @@ void __init __weak mem_init(void)
void __init mm_core_init_early(void)
{
int nid;
hugetlb_cma_reserve();
hugetlb_bootmem_alloc();
free_area_init();
sparse_init();
for_each_node_state(nid, N_MEMORY)
sparse_vmemmap_init_nid_late(nid);
memmap_init();
}
/*