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2dbb51c49f
There are a number of different views to how much memory is currently active. There is the arch-independent zone-sizing view, the bootmem allocator and memory models view. Architectures register this information at different times and is not necessarily in sync particularly with respect to some SPARSEMEM limitations. This patch introduces mminit_validate_memmodel_limits() which is able to validate and correct PFN ranges with respect to the memory model. It is only SPARSEMEM that currently validates itself. Signed-off-by: Mel Gorman <mel@csn.ul.ie> Cc: Christoph Lameter <cl@linux-foundation.org> Cc: Andy Whitcroft <apw@shadowen.org> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
114 lines
2.8 KiB
C
114 lines
2.8 KiB
C
/* internal.h: mm/ internal definitions
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*
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* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef __MM_INTERNAL_H
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#define __MM_INTERNAL_H
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#include <linux/mm.h>
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static inline void set_page_count(struct page *page, int v)
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{
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atomic_set(&page->_count, v);
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}
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/*
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* Turn a non-refcounted page (->_count == 0) into refcounted with
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* a count of one.
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*/
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static inline void set_page_refcounted(struct page *page)
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{
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VM_BUG_ON(PageTail(page));
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VM_BUG_ON(atomic_read(&page->_count));
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set_page_count(page, 1);
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}
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static inline void __put_page(struct page *page)
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{
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atomic_dec(&page->_count);
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}
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extern void __free_pages_bootmem(struct page *page, unsigned int order);
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/*
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* function for dealing with page's order in buddy system.
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* zone->lock is already acquired when we use these.
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* So, we don't need atomic page->flags operations here.
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*/
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static inline unsigned long page_order(struct page *page)
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{
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VM_BUG_ON(!PageBuddy(page));
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return page_private(page);
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}
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/*
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* FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
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* so all functions starting at paging_init should be marked __init
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* in those cases. SPARSEMEM, however, allows for memory hotplug,
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* and alloc_bootmem_node is not used.
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*/
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#ifdef CONFIG_SPARSEMEM
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#define __paginginit __meminit
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#else
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#define __paginginit __init
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#endif
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/* Memory initialisation debug and verification */
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enum mminit_level {
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MMINIT_WARNING,
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MMINIT_VERIFY,
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MMINIT_TRACE
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};
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#ifdef CONFIG_DEBUG_MEMORY_INIT
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extern int mminit_loglevel;
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#define mminit_dprintk(level, prefix, fmt, arg...) \
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do { \
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if (level < mminit_loglevel) { \
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printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \
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printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \
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} \
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} while (0)
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extern void mminit_verify_pageflags_layout(void);
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extern void mminit_verify_page_links(struct page *page,
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enum zone_type zone, unsigned long nid, unsigned long pfn);
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#else
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static inline void mminit_dprintk(enum mminit_level level,
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const char *prefix, const char *fmt, ...)
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{
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}
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static inline void mminit_verify_pageflags_layout(void)
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{
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}
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static inline void mminit_verify_page_links(struct page *page,
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enum zone_type zone, unsigned long nid, unsigned long pfn)
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{
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}
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#endif /* CONFIG_DEBUG_MEMORY_INIT */
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/* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
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#if defined(CONFIG_SPARSEMEM)
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extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
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unsigned long *end_pfn);
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#else
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static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
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unsigned long *end_pfn)
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{
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}
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#endif /* CONFIG_SPARSEMEM */
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#endif
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