2 * mm_init.c - Memory initialisation verification and debugging
4 * Copyright 2008 IBM Corporation, 2008
5 * Author Mel Gorman <mel@csn.ul.ie>
8 #include <linux/kernel.h>
9 #include <linux/init.h>
12 int __meminitdata mminit_loglevel;
14 void __init mminit_verify_pageflags_layout(void)
17 unsigned long or_mask, add_mask;
19 shift = 8 * sizeof(unsigned long);
20 width = shift - SECTIONS_WIDTH - NODES_WIDTH - ZONES_WIDTH;
21 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_widths",
22 "Section %d Node %d Zone %d Flags %d\n",
27 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_shifts",
28 "Section %d Node %d Zone %d\n",
36 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_offsets",
37 "Section %lu Node %lu Zone %lu\n",
38 (unsigned long)SECTIONS_PGSHIFT,
39 (unsigned long)NODES_PGSHIFT,
40 (unsigned long)ZONES_PGSHIFT);
41 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_zoneid",
42 "Zone ID: %lu -> %lu\n",
43 (unsigned long)ZONEID_PGOFF,
44 (unsigned long)(ZONEID_PGOFF + ZONEID_SHIFT));
45 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_usage",
46 "location: %d -> %d unused %d -> %d flags %d -> %d\n",
47 shift, width, width, NR_PAGEFLAGS, NR_PAGEFLAGS, 0);
48 #ifdef NODE_NOT_IN_PAGE_FLAGS
49 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags",
50 "Node not in page flags");
54 shift -= SECTIONS_WIDTH;
55 BUG_ON(shift != SECTIONS_PGSHIFT);
59 BUG_ON(shift != NODES_PGSHIFT);
63 BUG_ON(shift != ZONES_PGSHIFT);
66 /* Check for bitmask overlaps */
67 or_mask = (ZONES_MASK << ZONES_PGSHIFT) |
68 (NODES_MASK << NODES_PGSHIFT) |
69 (SECTIONS_MASK << SECTIONS_PGSHIFT);
70 add_mask = (ZONES_MASK << ZONES_PGSHIFT) +
71 (NODES_MASK << NODES_PGSHIFT) +
72 (SECTIONS_MASK << SECTIONS_PGSHIFT);
73 BUG_ON(or_mask != add_mask);
76 void __meminit mminit_verify_page_links(struct page *page, enum zone_type zone,
77 unsigned long nid, unsigned long pfn)
79 BUG_ON(page_to_nid(page) != nid);
80 BUG_ON(page_zonenum(page) != zone);
81 BUG_ON(page_to_pfn(page) != pfn);
84 static __init int set_mminit_loglevel(char *str)
86 get_option(&str, &mminit_loglevel);
89 early_param("mminit_loglevel", set_mminit_loglevel);