/* * mm_init.c - Memory initialisation verification and debugging * * Copyright 2008 IBM Corporation, 2008 * Author Mel Gorman <mel@csn.ul.ie> * */#include <linux/kernel.h>#include <linux/init.h>#include <linux/kobject.h>#include <linux/module.h>#include "internal.h"#ifdef CONFIG_DEBUG_MEMORY_INITint mminit_loglevel;#ifndef SECTIONS_SHIFT#define SECTIONS_SHIFT	0#endif/* The zonelists are simply reported, validation is manual. */void mminit_verify_zonelist(void){	int nid;	if (mminit_loglevel < MMINIT_VERIFY)		return;	for_each_online_node(nid) {		pg_data_t *pgdat = NODE_DATA(nid);		struct zone *zone;		struct zoneref *z;		struct zonelist *zonelist;		int i, listid, zoneid;		BUG_ON(MAX_ZONELISTS > 2);		for (i = 0; i < MAX_ZONELISTS * MAX_NR_ZONES; i++) {			/* Identify the zone and nodelist */			zoneid = i % MAX_NR_ZONES;			listid = i / MAX_NR_ZONES;			zonelist = &pgdat->node_zonelists[listid];			zone = &pgdat->node_zones[zoneid];			if (!populated_zone(zone))				continue;			/* Print information about the zonelist */			printk(KERN_DEBUG "mminit::zonelist %s %d:%s = ",				listid > 0 ? "thisnode" : "general", nid,				zone->name);			/* Iterate the zonelist */			for_each_zone_zonelist(zone, z, zonelist, zoneid) {#ifdef CONFIG_NUMA				printk(KERN_CONT "%d:%s ",					zone->node, zone->name);#else				printk(KERN_CONT "0:%s ", zone->name);#endif /* CONFIG_NUMA */			}			printk(KERN_CONT "\n");		}	}}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",		SECTIONS_SHIFT,		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);	return 0;}early_param("mminit_loglevel", set_mminit_loglevel);#endif /* CONFIG_DEBUG_MEMORY_INIT */struct kobject *mm_kobj;EXPORT_SYMBOL_GPL(mm_kobj);static int __init mm_sysfs_init(void){	mm_kobj = kobject_create_and_add("mm", kernel_kobj);	if (!mm_kobj)		return -ENOMEM;	return 0;}__initcall(mm_sysfs_init);