diff options
Diffstat (limited to 'mm/page_alloc.c')
| -rw-r--r-- | mm/page_alloc.c | 36 |
1 files changed, 25 insertions, 11 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index c26d3152f9ba..6d863c5afa08 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -6515,29 +6515,42 @@ void __init free_area_init_node(int nid, unsigned long *zones_size, * struct pages which are reserved in memblock allocator and their fields * may be accessed (for example page_to_pfn() on some configuration accesses * flags). We must explicitly zero those struct pages. + * + * This function also addresses a similar issue where struct pages are left + * uninitialized because the physical address range is not covered by + * memblock.memory or memblock.reserved. That could happen when memblock + * layout is manually configured via memmap=. */ void __init zero_resv_unavail(void) { phys_addr_t start, end; unsigned long pfn; u64 i, pgcnt; + phys_addr_t next = 0; /* - * Loop through ranges that are reserved, but do not have reported - * physical memory backing. + * Loop through unavailable ranges not covered by memblock.memory. */ pgcnt = 0; - for_each_resv_unavail_range(i, &start, &end) { - for (pfn = PFN_DOWN(start); pfn < PFN_UP(end); pfn++) { - if (!pfn_valid(ALIGN_DOWN(pfn, pageblock_nr_pages))) { - pfn = ALIGN_DOWN(pfn, pageblock_nr_pages) - + pageblock_nr_pages - 1; - continue; + for_each_mem_range(i, &memblock.memory, NULL, + NUMA_NO_NODE, MEMBLOCK_NONE, &start, &end, NULL) { + if (next < start) { + for (pfn = PFN_DOWN(next); pfn < PFN_UP(start); pfn++) { + if (!pfn_valid(ALIGN_DOWN(pfn, pageblock_nr_pages))) + continue; + mm_zero_struct_page(pfn_to_page(pfn)); + pgcnt++; } - mm_zero_struct_page(pfn_to_page(pfn)); - pgcnt++; } + next = end; } + for (pfn = PFN_DOWN(next); pfn < max_pfn; pfn++) { + if (!pfn_valid(ALIGN_DOWN(pfn, pageblock_nr_pages))) + continue; + mm_zero_struct_page(pfn_to_page(pfn)); + pgcnt++; + } + /* * Struct pages that do not have backing memory. This could be because @@ -6547,7 +6560,8 @@ void __init zero_resv_unavail(void) * this code can be removed. */ if (pgcnt) - pr_info("Reserved but unavailable: %lld pages", pgcnt); + pr_info("Zeroed struct page in unavailable ranges: %lld pages", pgcnt); + } #endif /* CONFIG_HAVE_MEMBLOCK && !CONFIG_FLAT_NODE_MEM_MAP */ |