mm: verify the page links and memory model
[sfrench/cifs-2.6.git] / mm / mm_init.c
index c01d8dfec8177423f16fd9ec976eaf9e6f44f146..e16990d629e66849a1d2780325356fd4dd1d45da 100644 (file)
@@ -7,9 +7,80 @@
  */
 #include <linux/kernel.h>
 #include <linux/init.h>
+#include "internal.h"
 
 int __meminitdata mminit_loglevel;
 
+void __init mminit_verify_pageflags_layout(void)
+{
+       int shift, width;
+       unsigned long or_mask, add_mask;
+
+       shift = 8 * sizeof(unsigned long);
+       width = shift - SECTIONS_WIDTH - NODES_WIDTH - ZONES_WIDTH;
+       mminit_dprintk(MMINIT_TRACE, "pageflags_layout_widths",
+               "Section %d Node %d Zone %d Flags %d\n",
+               SECTIONS_WIDTH,
+               NODES_WIDTH,
+               ZONES_WIDTH,
+               NR_PAGEFLAGS);
+       mminit_dprintk(MMINIT_TRACE, "pageflags_layout_shifts",
+               "Section %d Node %d Zone %d\n",
+#ifdef SECTIONS_SHIFT
+               SECTIONS_SHIFT,
+#else
+               0,
+#endif
+               NODES_SHIFT,
+               ZONES_SHIFT);
+       mminit_dprintk(MMINIT_TRACE, "pageflags_layout_offsets",
+               "Section %lu Node %lu Zone %lu\n",
+               (unsigned long)SECTIONS_PGSHIFT,
+               (unsigned long)NODES_PGSHIFT,
+               (unsigned long)ZONES_PGSHIFT);
+       mminit_dprintk(MMINIT_TRACE, "pageflags_layout_zoneid",
+               "Zone ID: %lu -> %lu\n",
+               (unsigned long)ZONEID_PGOFF,
+               (unsigned long)(ZONEID_PGOFF + ZONEID_SHIFT));
+       mminit_dprintk(MMINIT_TRACE, "pageflags_layout_usage",
+               "location: %d -> %d unused %d -> %d flags %d -> %d\n",
+               shift, width, width, NR_PAGEFLAGS, NR_PAGEFLAGS, 0);
+#ifdef NODE_NOT_IN_PAGE_FLAGS
+       mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags",
+               "Node not in page flags");
+#endif
+
+       if (SECTIONS_WIDTH) {
+               shift -= SECTIONS_WIDTH;
+               BUG_ON(shift != SECTIONS_PGSHIFT);
+       }
+       if (NODES_WIDTH) {
+               shift -= NODES_WIDTH;
+               BUG_ON(shift != NODES_PGSHIFT);
+       }
+       if (ZONES_WIDTH) {
+               shift -= ZONES_WIDTH;
+               BUG_ON(shift != ZONES_PGSHIFT);
+       }
+
+       /* Check for bitmask overlaps */
+       or_mask = (ZONES_MASK << ZONES_PGSHIFT) |
+                       (NODES_MASK << NODES_PGSHIFT) |
+                       (SECTIONS_MASK << SECTIONS_PGSHIFT);
+       add_mask = (ZONES_MASK << ZONES_PGSHIFT) +
+                       (NODES_MASK << NODES_PGSHIFT) +
+                       (SECTIONS_MASK << SECTIONS_PGSHIFT);
+       BUG_ON(or_mask != add_mask);
+}
+
+void __meminit mminit_verify_page_links(struct page *page, enum zone_type zone,
+                       unsigned long nid, unsigned long pfn)
+{
+       BUG_ON(page_to_nid(page) != nid);
+       BUG_ON(page_zonenum(page) != zone);
+       BUG_ON(page_to_pfn(page) != pfn);
+}
+
 static __init int set_mminit_loglevel(char *str)
 {
        get_option(&str, &mminit_loglevel);