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mm, page_alloc: Initialize subsection maps for non-NUMA systems

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Subsection maps are only initialized for NUMA systems when
they invoke free_areas_init(). Not initializing the subsection
maps with memory that exists at boot can cause the memmap for
a section to be freed when memory for a subsection within that
section is hot-added and then hot-removed, which is not correct
behavior, as pfn_valid() will always fail for any memory within
the section, since it no longer has a memmap. Thus, initialize
subsection maps for non-NUMA systems as well.

Change-Id: I8a0633f9b8634d9df7bb88bfbb6f4c306a277e0c
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
This commit is contained in:
Isaac J. Manjarres 2021-03-30 00:01:36 -07:00 • committed by Gerrit - the friendly Code Review server
commit d801e75f14
1 changed files with 6 additions and 0 deletions
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6
mm/page_alloc.c
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@ -7032,6 +7032,8 @@ void __init free_area_init_node(int nid, unsigned long *zones_size,
pg_data_t *pgdat = NODE_DATA(nid);
unsigned long start_pfn = 0;
unsigned long end_pfn = 0;
u64 i;
phys_addr_t start, end;
/* pg_data_t should be reset to zero when it's allocated */
WARN_ON(pgdat->nr_zones || pgdat->kswapd_classzone_idx);
@ -7045,6 +7047,10 @@ void __init free_area_init_node(int nid, unsigned long *zones_size,
(u64)start_pfn << PAGE_SHIFT,
end_pfn ? ((u64)end_pfn << PAGE_SHIFT) - 1 : 0);
#else
for_each_mem_range(i, &memblock.memory, NULL, nid, MEMBLOCK_NONE,
&start, &end, NULL)
subsection_map_init((unsigned long)start >> PAGE_SHIFT,
(unsigned long)(end - start) >> PAGE_SHIFT);
start_pfn = node_start_pfn;
#endif
calculate_node_totalpages(pgdat, start_pfn, end_pfn,