diff options
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/page_alloc.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index b54c5cbf020..5a234b64f3a 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -4187,10 +4187,23 @@ int __meminit __early_pfn_to_nid(unsigned long pfn) { unsigned long start_pfn, end_pfn; int i, nid; + /* + * NOTE: The following SMP-unsafe globals are only used early in boot + * when the kernel is running single-threaded. + */ + static unsigned long __meminitdata last_start_pfn, last_end_pfn; + static int __meminitdata last_nid; + + if (last_start_pfn <= pfn && pfn < last_end_pfn) + return last_nid; for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) - if (start_pfn <= pfn && pfn < end_pfn) + if (start_pfn <= pfn && pfn < end_pfn) { + last_start_pfn = start_pfn; + last_end_pfn = end_pfn; + last_nid = nid; return nid; + } /* This is a memory hole */ return -1; } |