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mm: mark early-init static variables with __meminitdata

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Static variables defined inside __meminit functions should also be marked
with __meminitdata, so that their storage is placed in the .init.data
section and reclaimed with free_initmem(), thereby reducing permanent .bss
memory usage when CONFIG_MEMORY_HOTPLUG is disabled.

Link: https://lkml.kernel.org/r/20260321120847.8159-1-pilgrimtao@gmail.com
Signed-off-by: Kaitao Cheng <chengkaitao@kylinos.cn>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kaitao Cheng
2026-03-21 20:08:47 +08:00
committed by Andrew Morton
parent 4fb61d95ad
commit c4a9439a5a
2 changed files with 2 additions and 2 deletions
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2
mm/mm_init.c
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@@ -812,7 +812,7 @@ void __meminit reserve_bootmem_region(phys_addr_t start,
static bool __meminit
overlap_memmap_init(unsigned long zone, unsigned long *pfn)
{
static struct memblock_region *r;
static struct memblock_region *r __meminitdata;
if (mirrored_kernelcore && zone == ZONE_MOVABLE) {
if (!r || *pfn >= memblock_region_memory_end_pfn(r)) {

2
mm/sparse-vmemmap.c
View File

@@ -62,7 +62,7 @@ void * __meminit vmemmap_alloc_block(unsigned long size, int node)
if (slab_is_available()) {
gfp_t gfp_mask = GFP_KERNEL|__GFP_RETRY_MAYFAIL|__GFP_NOWARN;
int order = get_order(size);
static bool warned;
static bool warned __meminitdata;
struct page *page;
page = alloc_pages_node(node, gfp_mask, order);