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https://github.com/torvalds/linux
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51a1007d41
Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE by stealing one bit from the offset. This reduces the maximum swap space per file: on 32bit to 16 GiB (was 32 GiB). Note that this bit does not conflict with swap PMDs and could also be used in swap PMD context later. While at it, mask the type in __swp_entry(). Link: https://lkml.kernel.org/r/20230113171026.582290-20-david@redhat.com Signed-off-by: David Hildenbrand <david@redhat.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Albert Ou <aou@eecs.berkeley.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
42 lines
1.3 KiB
C
42 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2012 Regents of the University of California
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*/
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#ifndef _ASM_RISCV_PGTABLE_BITS_H
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#define _ASM_RISCV_PGTABLE_BITS_H
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#define _PAGE_ACCESSED_OFFSET 6
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#define _PAGE_PRESENT (1 << 0)
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#define _PAGE_READ (1 << 1) /* Readable */
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#define _PAGE_WRITE (1 << 2) /* Writable */
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#define _PAGE_EXEC (1 << 3) /* Executable */
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#define _PAGE_USER (1 << 4) /* User */
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#define _PAGE_GLOBAL (1 << 5) /* Global */
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#define _PAGE_ACCESSED (1 << 6) /* Set by hardware on any access */
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#define _PAGE_DIRTY (1 << 7) /* Set by hardware on any write */
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#define _PAGE_SOFT (1 << 8) /* Reserved for software */
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#define _PAGE_SPECIAL _PAGE_SOFT
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#define _PAGE_TABLE _PAGE_PRESENT
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/*
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* _PAGE_PROT_NONE is set on not-present pages (and ignored by the hardware) to
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* distinguish them from swapped out pages
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*/
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#define _PAGE_PROT_NONE _PAGE_GLOBAL
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/* Used for swap PTEs only. */
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#define _PAGE_SWP_EXCLUSIVE _PAGE_ACCESSED
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#define _PAGE_PFN_SHIFT 10
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/*
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* when all of R/W/X are zero, the PTE is a pointer to the next level
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* of the page table; otherwise, it is a leaf PTE.
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*/
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#define _PAGE_LEAF (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC)
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#endif /* _ASM_RISCV_PGTABLE_BITS_H */
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