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23baf831a3
MAX_ORDER currently defined as number of orders page allocator supports: user can ask buddy allocator for page order between 0 and MAX_ORDER-1. This definition is counter-intuitive and lead to number of bugs all over the kernel. Change the definition of MAX_ORDER to be inclusive: the range of orders user can ask from buddy allocator is 0..MAX_ORDER now. [kirill@shutemov.name: fix min() warning] Link: https://lkml.kernel.org/r/20230315153800.32wib3n5rickolvh@box [akpm@linux-foundation.org: fix another min_t warning] [kirill@shutemov.name: fixups per Zi Yan] Link: https://lkml.kernel.org/r/20230316232144.b7ic4cif4kjiabws@box.shutemov.name [akpm@linux-foundation.org: fix underlining in docs] Link: https://lore.kernel.org/oe-kbuild-all/202303191025.VRCTk6mP-lkp@intel.com/ Link: https://lkml.kernel.org/r/20230315113133.11326-11-kirill.shutemov@linux.intel.com Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Reviewed-by: Michael Ellerman <mpe@ellerman.id.au> [powerpc] Cc: "Kirill A. Shutemov" <kirill@shutemov.name> Cc: Zi Yan <ziy@nvidia.com> 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_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
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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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