mm: remove mm_init compilation dependency on CONFIG_DEBUG_MEMORY_INIT
[linux-2.6.git] / mm / mm_init.c
1 /*
2  * mm_init.c - Memory initialisation verification and debugging
3  *
4  * Copyright 2008 IBM Corporation, 2008
5  * Author Mel Gorman <mel@csn.ul.ie>
6  *
7  */
8 #include <linux/kernel.h>
9 #include <linux/init.h>
10 #include "internal.h"
11
12 #ifdef CONFIG_DEBUG_MEMORY_INIT
13 int __meminitdata mminit_loglevel;
14
15 /* The zonelists are simply reported, validation is manual. */
16 void mminit_verify_zonelist(void)
17 {
18         int nid;
19
20         if (mminit_loglevel < MMINIT_VERIFY)
21                 return;
22
23         for_each_online_node(nid) {
24                 pg_data_t *pgdat = NODE_DATA(nid);
25                 struct zone *zone;
26                 struct zoneref *z;
27                 struct zonelist *zonelist;
28                 int i, listid, zoneid;
29
30                 BUG_ON(MAX_ZONELISTS > 2);
31                 for (i = 0; i < MAX_ZONELISTS * MAX_NR_ZONES; i++) {
32
33                         /* Identify the zone and nodelist */
34                         zoneid = i % MAX_NR_ZONES;
35                         listid = i / MAX_NR_ZONES;
36                         zonelist = &pgdat->node_zonelists[listid];
37                         zone = &pgdat->node_zones[zoneid];
38                         if (!populated_zone(zone))
39                                 continue;
40
41                         /* Print information about the zonelist */
42                         printk(KERN_DEBUG "mminit::zonelist %s %d:%s = ",
43                                 listid > 0 ? "thisnode" : "general", nid,
44                                 zone->name);
45
46                         /* Iterate the zonelist */
47                         for_each_zone_zonelist(zone, z, zonelist, zoneid) {
48 #ifdef CONFIG_NUMA
49                                 printk(KERN_CONT "%d:%s ",
50                                         zone->node, zone->name);
51 #else
52                                 printk(KERN_CONT "0:%s ", zone->name);
53 #endif /* CONFIG_NUMA */
54                         }
55                         printk(KERN_CONT "\n");
56                 }
57         }
58 }
59
60 void __init mminit_verify_pageflags_layout(void)
61 {
62         int shift, width;
63         unsigned long or_mask, add_mask;
64
65         shift = 8 * sizeof(unsigned long);
66         width = shift - SECTIONS_WIDTH - NODES_WIDTH - ZONES_WIDTH;
67         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_widths",
68                 "Section %d Node %d Zone %d Flags %d\n",
69                 SECTIONS_WIDTH,
70                 NODES_WIDTH,
71                 ZONES_WIDTH,
72                 NR_PAGEFLAGS);
73         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_shifts",
74                 "Section %d Node %d Zone %d\n",
75 #ifdef SECTIONS_SHIFT
76                 SECTIONS_SHIFT,
77 #else
78                 0,
79 #endif
80                 NODES_SHIFT,
81                 ZONES_SHIFT);
82         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_offsets",
83                 "Section %lu Node %lu Zone %lu\n",
84                 (unsigned long)SECTIONS_PGSHIFT,
85                 (unsigned long)NODES_PGSHIFT,
86                 (unsigned long)ZONES_PGSHIFT);
87         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_zoneid",
88                 "Zone ID: %lu -> %lu\n",
89                 (unsigned long)ZONEID_PGOFF,
90                 (unsigned long)(ZONEID_PGOFF + ZONEID_SHIFT));
91         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_usage",
92                 "location: %d -> %d unused %d -> %d flags %d -> %d\n",
93                 shift, width, width, NR_PAGEFLAGS, NR_PAGEFLAGS, 0);
94 #ifdef NODE_NOT_IN_PAGE_FLAGS
95         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags",
96                 "Node not in page flags");
97 #endif
98
99         if (SECTIONS_WIDTH) {
100                 shift -= SECTIONS_WIDTH;
101                 BUG_ON(shift != SECTIONS_PGSHIFT);
102         }
103         if (NODES_WIDTH) {
104                 shift -= NODES_WIDTH;
105                 BUG_ON(shift != NODES_PGSHIFT);
106         }
107         if (ZONES_WIDTH) {
108                 shift -= ZONES_WIDTH;
109                 BUG_ON(shift != ZONES_PGSHIFT);
110         }
111
112         /* Check for bitmask overlaps */
113         or_mask = (ZONES_MASK << ZONES_PGSHIFT) |
114                         (NODES_MASK << NODES_PGSHIFT) |
115                         (SECTIONS_MASK << SECTIONS_PGSHIFT);
116         add_mask = (ZONES_MASK << ZONES_PGSHIFT) +
117                         (NODES_MASK << NODES_PGSHIFT) +
118                         (SECTIONS_MASK << SECTIONS_PGSHIFT);
119         BUG_ON(or_mask != add_mask);
120 }
121
122 void __meminit mminit_verify_page_links(struct page *page, enum zone_type zone,
123                         unsigned long nid, unsigned long pfn)
124 {
125         BUG_ON(page_to_nid(page) != nid);
126         BUG_ON(page_zonenum(page) != zone);
127         BUG_ON(page_to_pfn(page) != pfn);
128 }
129
130 static __init int set_mminit_loglevel(char *str)
131 {
132         get_option(&str, &mminit_loglevel);
133         return 0;
134 }
135 early_param("mminit_loglevel", set_mminit_loglevel);
136 #endif /* CONFIG_DEBUG_MEMORY_INIT */