Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[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 <linux/kobject.h>
11 #include <linux/module.h>
12 #include "internal.h"
13
14 #ifdef CONFIG_DEBUG_MEMORY_INIT
15 int mminit_loglevel;
16
17 #ifndef SECTIONS_SHIFT
18 #define SECTIONS_SHIFT  0
19 #endif
20
21 /* The zonelists are simply reported, validation is manual. */
22 void mminit_verify_zonelist(void)
23 {
24         int nid;
25
26         if (mminit_loglevel < MMINIT_VERIFY)
27                 return;
28
29         for_each_online_node(nid) {
30                 pg_data_t *pgdat = NODE_DATA(nid);
31                 struct zone *zone;
32                 struct zoneref *z;
33                 struct zonelist *zonelist;
34                 int i, listid, zoneid;
35
36                 BUG_ON(MAX_ZONELISTS > 2);
37                 for (i = 0; i < MAX_ZONELISTS * MAX_NR_ZONES; i++) {
38
39                         /* Identify the zone and nodelist */
40                         zoneid = i % MAX_NR_ZONES;
41                         listid = i / MAX_NR_ZONES;
42                         zonelist = &pgdat->node_zonelists[listid];
43                         zone = &pgdat->node_zones[zoneid];
44                         if (!populated_zone(zone))
45                                 continue;
46
47                         /* Print information about the zonelist */
48                         printk(KERN_DEBUG "mminit::zonelist %s %d:%s = ",
49                                 listid > 0 ? "thisnode" : "general", nid,
50                                 zone->name);
51
52                         /* Iterate the zonelist */
53                         for_each_zone_zonelist(zone, z, zonelist, zoneid) {
54 #ifdef CONFIG_NUMA
55                                 printk(KERN_CONT "%d:%s ",
56                                         zone->node, zone->name);
57 #else
58                                 printk(KERN_CONT "0:%s ", zone->name);
59 #endif /* CONFIG_NUMA */
60                         }
61                         printk(KERN_CONT "\n");
62                 }
63         }
64 }
65
66 void __init mminit_verify_pageflags_layout(void)
67 {
68         int shift, width;
69         unsigned long or_mask, add_mask;
70
71         shift = 8 * sizeof(unsigned long);
72         width = shift - SECTIONS_WIDTH - NODES_WIDTH - ZONES_WIDTH;
73         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_widths",
74                 "Section %d Node %d Zone %d Flags %d\n",
75                 SECTIONS_WIDTH,
76                 NODES_WIDTH,
77                 ZONES_WIDTH,
78                 NR_PAGEFLAGS);
79         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_shifts",
80                 "Section %d Node %d Zone %d\n",
81                 SECTIONS_SHIFT,
82                 NODES_SHIFT,
83                 ZONES_SHIFT);
84         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_offsets",
85                 "Section %lu Node %lu Zone %lu\n",
86                 (unsigned long)SECTIONS_PGSHIFT,
87                 (unsigned long)NODES_PGSHIFT,
88                 (unsigned long)ZONES_PGSHIFT);
89         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_zoneid",
90                 "Zone ID: %lu -> %lu\n",
91                 (unsigned long)ZONEID_PGOFF,
92                 (unsigned long)(ZONEID_PGOFF + ZONEID_SHIFT));
93         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_usage",
94                 "location: %d -> %d unused %d -> %d flags %d -> %d\n",
95                 shift, width, width, NR_PAGEFLAGS, NR_PAGEFLAGS, 0);
96 #ifdef NODE_NOT_IN_PAGE_FLAGS
97         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags",
98                 "Node not in page flags");
99 #endif
100
101         if (SECTIONS_WIDTH) {
102                 shift -= SECTIONS_WIDTH;
103                 BUG_ON(shift != SECTIONS_PGSHIFT);
104         }
105         if (NODES_WIDTH) {
106                 shift -= NODES_WIDTH;
107                 BUG_ON(shift != NODES_PGSHIFT);
108         }
109         if (ZONES_WIDTH) {
110                 shift -= ZONES_WIDTH;
111                 BUG_ON(shift != ZONES_PGSHIFT);
112         }
113
114         /* Check for bitmask overlaps */
115         or_mask = (ZONES_MASK << ZONES_PGSHIFT) |
116                         (NODES_MASK << NODES_PGSHIFT) |
117                         (SECTIONS_MASK << SECTIONS_PGSHIFT);
118         add_mask = (ZONES_MASK << ZONES_PGSHIFT) +
119                         (NODES_MASK << NODES_PGSHIFT) +
120                         (SECTIONS_MASK << SECTIONS_PGSHIFT);
121         BUG_ON(or_mask != add_mask);
122 }
123
124 void __meminit mminit_verify_page_links(struct page *page, enum zone_type zone,
125                         unsigned long nid, unsigned long pfn)
126 {
127         BUG_ON(page_to_nid(page) != nid);
128         BUG_ON(page_zonenum(page) != zone);
129         BUG_ON(page_to_pfn(page) != pfn);
130 }
131
132 static __init int set_mminit_loglevel(char *str)
133 {
134         get_option(&str, &mminit_loglevel);
135         return 0;
136 }
137 early_param("mminit_loglevel", set_mminit_loglevel);
138 #endif /* CONFIG_DEBUG_MEMORY_INIT */
139
140 struct kobject *mm_kobj;
141 EXPORT_SYMBOL_GPL(mm_kobj);
142
143 static int __init mm_sysfs_init(void)
144 {
145         mm_kobj = kobject_create_and_add("mm", kernel_kobj);
146         if (!mm_kobj)
147                 return -ENOMEM;
148
149         return 0;
150 }
151
152 __initcall(mm_sysfs_init);