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5e0a760b44
commit 23baf831a3 ("mm, treewide: redefine MAX_ORDER sanely") has
changed the definition of MAX_ORDER to be inclusive. This has caused
issues with code that was not yet upstream and depended on the previous
definition.
To draw attention to the altered meaning of the define, rename MAX_ORDER
to MAX_PAGE_ORDER.
Link: https://lkml.kernel.org/r/20231228144704.14033-2-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
98 lines
2.7 KiB
C
98 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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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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* 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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#define PB_migratetype_bits 3
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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 + PB_migratetype_bits - 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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/*
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* Huge pages are a constant size, but don't exceed the maximum allocation
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* granularity.
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*/
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#define pageblock_order min_t(unsigned int, HUGETLB_PAGE_ORDER, MAX_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_PAGE_ORDER
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#endif /* CONFIG_HUGETLB_PAGE */
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#define pageblock_nr_pages (1UL << pageblock_order)
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#define pageblock_align(pfn) ALIGN((pfn), pageblock_nr_pages)
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#define pageblock_aligned(pfn) IS_ALIGNED((pfn), pageblock_nr_pages)
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#define pageblock_start_pfn(pfn) ALIGN_DOWN((pfn), pageblock_nr_pages)
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#define pageblock_end_pfn(pfn) ALIGN((pfn) + 1, pageblock_nr_pages)
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/* Forward declaration */
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struct page;
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unsigned long get_pfnblock_flags_mask(const struct page *page,
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unsigned long pfn,
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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 mask);
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/* Declarations for getting and setting flags. See mm/page_alloc.c */
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#ifdef CONFIG_COMPACTION
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#define get_pageblock_skip(page) \
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get_pfnblock_flags_mask(page, page_to_pfn(page), \
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(1 << (PB_migrate_skip)))
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#define clear_pageblock_skip(page) \
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set_pfnblock_flags_mask(page, 0, page_to_pfn(page), \
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(1 << PB_migrate_skip))
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#define set_pageblock_skip(page) \
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set_pfnblock_flags_mask(page, (1 << PB_migrate_skip), \
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page_to_pfn(page), \
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(1 << PB_migrate_skip))
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#else
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static inline bool get_pageblock_skip(struct page *page)
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{
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return false;
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}
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static inline void clear_pageblock_skip(struct page *page)
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{
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}
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static inline void set_pageblock_skip(struct page *page)
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{
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}
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#endif /* CONFIG_COMPACTION */
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#endif /* PAGEBLOCK_FLAGS_H */
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