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mm/mm_init: drop overlap_memmap_init()

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When ZONE_NORMAL and ZONE_MOVABLE could overlap because kernelcore=mirror
didn't reduce the span of ZONE_NORMAL, initialization of the memory map had
to skip overlapping pages during initialization of ZONE_MOVABLE to avoid
double initialization of the same struct pages.

Since kernelcore=mirror works now the same way as other variants of
kernelcore=/movablecore=, and adjusts the span of ZONE_NORMAL, there can't
be an overlap between ZONE_NORMAL and ZONE_MOVABLE.

Remove overlap_memmap_init().

Co-developed-by: Wei Yang <richard.weiyang@gmail.com>
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Reviewed-by: David Hildenbrand (Arm) <david@kernel.org>
Link: https://patch.msgid.link/20260630072212.624305-3-rppt@kernel.org
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: David Hildenbrand (Arm) <david@kernel.org>
This commit is contained in:
Mike Rapoport (Microsoft) 2026-06-30 10:22:12 +03:00
parent eb0e5b6136
commit f042b69ebb
1 changed files with 0 additions and 24 deletions
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24
mm/mm_init.c
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@ -799,28 +799,6 @@ void __meminit init_deferred_page(unsigned long pfn, int nid)
__init_deferred_page(pfn, nid);
}
/* If zone is ZONE_MOVABLE but memory is mirrored, it is an overlapped init */
static bool __meminit
overlap_memmap_init(unsigned long zone, unsigned long *pfn)
{
static struct memblock_region *r __meminitdata;
if (mirrored_kernelcore && zone == ZONE_MOVABLE) {
if (!r || *pfn >= memblock_region_memory_end_pfn(r)) {
for_each_mem_region(r) {
if (*pfn < memblock_region_memory_end_pfn(r))
break;
}
}
if (*pfn >= memblock_region_memory_base_pfn(r) &&
memblock_is_mirror(r)) {
*pfn = memblock_region_memory_end_pfn(r);
return true;
}
}
return false;
}
/*
* Only struct pages that correspond to ranges defined by memblock.memory
* are zeroed and initialized by going through __init_single_page() during
@ -907,8 +885,6 @@ void __meminit memmap_init_range(unsigned long size, int nid, unsigned long zone
* function. They do not exist on hotplugged memory.
*/
if (context == MEMINIT_EARLY) {
if (overlap_memmap_init(zone, &pfn))
continue;
if (defer_init(nid, pfn, zone_end_pfn)) {
deferred_struct_pages = true;
break;