diff options
Diffstat (limited to 'arch/x86_64/mm/numa.c')
-rw-r--r-- | arch/x86_64/mm/numa.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/arch/x86_64/mm/numa.c b/arch/x86_64/mm/numa.c index 994dbaeb33f0..6ef9f9a76235 100644 --- a/arch/x86_64/mm/numa.c +++ b/arch/x86_64/mm/numa.c | |||
@@ -360,3 +360,39 @@ EXPORT_SYMBOL(node_to_cpumask); | |||
360 | EXPORT_SYMBOL(memnode_shift); | 360 | EXPORT_SYMBOL(memnode_shift); |
361 | EXPORT_SYMBOL(memnodemap); | 361 | EXPORT_SYMBOL(memnodemap); |
362 | EXPORT_SYMBOL(node_data); | 362 | EXPORT_SYMBOL(node_data); |
363 | |||
364 | #ifdef CONFIG_DISCONTIGMEM | ||
365 | /* | ||
366 | * Functions to convert PFNs from/to per node page addresses. | ||
367 | * These are out of line because they are quite big. | ||
368 | * They could be all tuned by pre caching more state. | ||
369 | * Should do that. | ||
370 | */ | ||
371 | |||
372 | /* Requires pfn_valid(pfn) to be true */ | ||
373 | struct page *pfn_to_page(unsigned long pfn) | ||
374 | { | ||
375 | int nid = phys_to_nid(((unsigned long)(pfn)) << PAGE_SHIFT); | ||
376 | return (pfn - node_start_pfn(nid)) + NODE_DATA(nid)->node_mem_map; | ||
377 | } | ||
378 | EXPORT_SYMBOL(pfn_to_page); | ||
379 | |||
380 | unsigned long page_to_pfn(struct page *page) | ||
381 | { | ||
382 | return (long)(((page) - page_zone(page)->zone_mem_map) + | ||
383 | page_zone(page)->zone_start_pfn); | ||
384 | } | ||
385 | EXPORT_SYMBOL(page_to_pfn); | ||
386 | |||
387 | int pfn_valid(unsigned long pfn) | ||
388 | { | ||
389 | unsigned nid; | ||
390 | if (pfn >= num_physpages) | ||
391 | return 0; | ||
392 | nid = pfn_to_nid(pfn); | ||
393 | if (nid == 0xff) | ||
394 | return 0; | ||
395 | return pfn >= node_start_pfn(nid) && (pfn) < node_end_pfn(nid); | ||
396 | } | ||
397 | EXPORT_SYMBOL(pfn_valid); | ||
398 | #endif | ||