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mm/sparse: remove !CONFIG_SPARSEMEM_VMEMMAP leftovers for CONFIG_MEMORY_HOTPLUG

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CONFIG_MEMORY_HOTPLUG now depends on CONFIG_SPARSEMEM_VMEMMAP.  So let's
remove the !CONFIG_SPARSEMEM_VMEMMAP leftovers that are dead code.

Adjust the comment above fill_subsection_map() accordingly.

Link: https://lkml.kernel.org/r/20260320-sparsemem_cleanups-v2-6-096addc8800d@kernel.org
Signed-off-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Wei Xu <weixugc@google.com>
Cc: Yuanchu Xie <yuanchu@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
David Hildenbrand (Arm)
2026-03-20 23:13:38 +01:00
committed by Andrew Morton
parent 62257a5fb9
commit 119c31caa5
1 changed files with 2 additions and 67 deletions
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69
mm/sparse.c
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@@ -657,7 +657,6 @@ void offline_mem_sections(unsigned long start_pfn, unsigned long end_pfn)
}
}
#ifdef CONFIG_SPARSEMEM_VMEMMAP
static struct page * __meminit populate_section_memmap(unsigned long pfn,
unsigned long nr_pages, int nid, struct vmem_altmap *altmap,
struct dev_pagemap *pgmap)
@@ -729,73 +728,11 @@ static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages)
return rc;
}
#else
static struct page * __meminit populate_section_memmap(unsigned long pfn,
unsigned long nr_pages, int nid, struct vmem_altmap *altmap,
struct dev_pagemap *pgmap)
{
return kvmalloc_node(array_size(sizeof(struct page),
PAGES_PER_SECTION), GFP_KERNEL, nid);
}
static void depopulate_section_memmap(unsigned long pfn, unsigned long nr_pages,
struct vmem_altmap *altmap)
{
kvfree(pfn_to_page(pfn));
}
static void free_map_bootmem(struct page *memmap)
{
unsigned long maps_section_nr, removing_section_nr, i;
unsigned long type, nr_pages;
struct page *page = virt_to_page(memmap);
nr_pages = PAGE_ALIGN(PAGES_PER_SECTION * sizeof(struct page))
>> PAGE_SHIFT;
for (i = 0; i < nr_pages; i++, page++) {
type = bootmem_type(page);
BUG_ON(type == NODE_INFO);
maps_section_nr = pfn_to_section_nr(page_to_pfn(page));
removing_section_nr = bootmem_info(page);
/*
* When this function is called, the removing section is
* logical offlined state. This means all pages are isolated
* from page allocator. If removing section's memmap is placed
* on the same section, it must not be freed.
* If it is freed, page allocator may allocate it which will
* be removed physically soon.
*/
if (maps_section_nr != removing_section_nr)
put_page_bootmem(page);
}
}
static int clear_subsection_map(unsigned long pfn, unsigned long nr_pages)
{
return 0;
}
static bool is_subsection_map_empty(struct mem_section *ms)
{
return true;
}
static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages)
{
return 0;
}
#endif /* CONFIG_SPARSEMEM_VMEMMAP */
/*
* To deactivate a memory region, there are 3 cases to handle across
* two configurations (SPARSEMEM_VMEMMAP={y,n}):
* To deactivate a memory region, there are 3 cases to handle:
*
* 1. deactivation of a partial hot-added section (only possible in
* the SPARSEMEM_VMEMMAP=y case).
* 1. deactivation of a partial hot-added section:
* a) section was present at memory init.
* b) section was hot-added post memory init.
* 2. deactivation of a complete hot-added section.
@@ -803,8 +740,6 @@ static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages)
*
* For 1, when subsection_map does not empty we will not be freeing the
* usage map, but still need to free the vmemmap range.
*
* For 2 and 3, the SPARSEMEM_VMEMMAP={y,n} cases are unified
*/
static void section_deactivate(unsigned long pfn, unsigned long nr_pages,
struct vmem_altmap *altmap)