forked from Qortal/Brooklyn
2a709f28fa
* 0day explit mitigation * Memory corruption prevention * Privilege escalation prevention * Buffer over flow prevention * File System corruption defense * Thread escape prevention This may very well be the most intensive inclusion to BrooklynR. This will not be part of an x86 suite nor it will be released as tool kit. The security core toolkit will remain part of kernel base.
102 lines
3.1 KiB
C
102 lines
3.1 KiB
C
/*
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* Macros for manipulating and testing flags related to a
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* pageblock_nr_pages number of pages.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation version 2 of the License
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Copyright (C) IBM Corporation, 2006
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*
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* Original author, Mel Gorman
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* Major cleanups and reduction of bit operations, Andy Whitcroft
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*/
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#ifndef PAGEBLOCK_FLAGS_H
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#define PAGEBLOCK_FLAGS_H
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#include <linux/types.h>
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/* Bit indices that affect a whole block of pages */
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enum pageblock_bits {
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PB_migrate,
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PB_migrate_end = PB_migrate + 3 - 1,
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/* 3 bits required for migrate types */
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PB_migrate_skip,/* If set the block is skipped by compaction */
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/*
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* Assume the bits will always align on a word. If this assumption
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* changes then get/set pageblock needs updating.
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*/
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NR_PAGEBLOCK_BITS
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};
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#ifdef CONFIG_HUGETLB_PAGE
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#ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE
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/* Huge page sizes are variable */
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extern unsigned int pageblock_order;
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#else /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */
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/* Huge pages are a constant size */
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#define pageblock_order HUGETLB_PAGE_ORDER
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#endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */
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#else /* CONFIG_HUGETLB_PAGE */
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/* If huge pages are not used, group by MAX_ORDER_NR_PAGES */
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#define pageblock_order (MAX_ORDER-1)
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#endif /* CONFIG_HUGETLB_PAGE */
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#define pageblock_nr_pages (1UL << pageblock_order)
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/* Forward declaration */
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struct page;
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unsigned long get_pfnblock_flags_mask(struct page *page,
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unsigned long pfn,
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unsigned long end_bitidx,
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unsigned long mask);
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void set_pfnblock_flags_mask(struct page *page,
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unsigned long flags,
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unsigned long pfn,
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unsigned long end_bitidx,
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unsigned long mask);
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/* Declarations for getting and setting flags. See mm/page_alloc.c */
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#define get_pageblock_flags_group(page, start_bitidx, end_bitidx) \
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get_pfnblock_flags_mask(page, page_to_pfn(page), \
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end_bitidx, \
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(1 << (end_bitidx - start_bitidx + 1)) - 1)
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#define set_pageblock_flags_group(page, flags, start_bitidx, end_bitidx) \
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set_pfnblock_flags_mask(page, flags, page_to_pfn(page), \
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end_bitidx, \
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(1 << (end_bitidx - start_bitidx + 1)) - 1)
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#ifdef CONFIG_COMPACTION
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#define get_pageblock_skip(page) \
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get_pageblock_flags_group(page, PB_migrate_skip, \
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PB_migrate_skip)
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#define clear_pageblock_skip(page) \
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set_pageblock_flags_group(page, 0, PB_migrate_skip, \
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PB_migrate_skip)
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#define set_pageblock_skip(page) \
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set_pageblock_flags_group(page, 1, PB_migrate_skip, \
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PB_migrate_skip)
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#endif /* CONFIG_COMPACTION */
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#endif /* PAGEBLOCK_FLAGS_H */
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