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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>
37 lines
863 B
C
37 lines
863 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _TOOLS_MMZONE_H
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#define _TOOLS_MMZONE_H
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#include <linux/atomic.h>
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struct pglist_data *first_online_pgdat(void);
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struct pglist_data *next_online_pgdat(struct pglist_data *pgdat);
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#define for_each_online_pgdat(pgdat) \
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for (pgdat = first_online_pgdat(); \
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pgdat; \
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pgdat = next_online_pgdat(pgdat))
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enum zone_type {
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__MAX_NR_ZONES
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};
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#define MAX_NR_ZONES __MAX_NR_ZONES
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#define MAX_ORDER 10
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#define MAX_ORDER_NR_PAGES (1 << MAX_ORDER)
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#define pageblock_order MAX_ORDER
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#define pageblock_nr_pages BIT(pageblock_order)
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#define pageblock_align(pfn) ALIGN((pfn), pageblock_nr_pages)
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#define pageblock_start_pfn(pfn) ALIGN_DOWN((pfn), pageblock_nr_pages)
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struct zone {
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atomic_long_t managed_pages;
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};
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typedef struct pglist_data {
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struct zone node_zones[MAX_NR_ZONES];
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} pg_data_t;
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#endif
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