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-rw-r--r--mm/memblock.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/mm/memblock.c b/mm/memblock.c
index 5a88d6d24d79..4a62f7774b65 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -735,6 +735,40 @@ int __init_memblock memblock_add(phys_addr_t base, phys_addr_t size)
}
/**
+ * memblock_validate_numa_coverage - check if amount of memory with
+ * no node ID assigned is less than a threshold
+ * @threshold_bytes: maximal number of pages that can have unassigned node
+ * ID (in bytes).
+ *
+ * A buggy firmware may report memory that does not belong to any node.
+ * Check if amount of such memory is below @threshold_bytes.
+ *
+ * Return: true on success, false on failure.
+ */
+bool __init_memblock memblock_validate_numa_coverage(unsigned long threshold_bytes)
+{
+ unsigned long nr_pages = 0;
+ unsigned long start_pfn, end_pfn, mem_size_mb;
+ int nid, i;
+
+ /* calculate lose page */
+ for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) {
+ if (nid == NUMA_NO_NODE)
+ nr_pages += end_pfn - start_pfn;
+ }
+
+ if ((nr_pages << PAGE_SHIFT) >= threshold_bytes) {
+ mem_size_mb = memblock_phys_mem_size() >> 20;
+ pr_err("NUMA: no nodes coverage for %luMB of %luMB RAM\n",
+ (nr_pages << PAGE_SHIFT) >> 20, mem_size_mb);
+ return false;
+ }
+
+ return true;
+}
+
+
+/**
* memblock_isolate_range - isolate given range into disjoint memblocks
* @type: memblock type to isolate range for
* @base: base of range to isolate