mirror of
https://github.com/torvalds/linux
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dc4875f0e7
No functional change in this patch. [aneesh.kumar@linux.ibm.com: m68k build error reported by kernel robot] Link: https://lkml.kernel.org/r/87tulxnb2v.fsf@linux.ibm.com Link: https://lkml.kernel.org/r/20210615110859.320299-2-aneesh.kumar@linux.ibm.com Link: https://lore.kernel.org/linuxppc-dev/CAHk-=wi+J+iodze9FtjM3Zi4j4OeS+qqbKxME9QN4roxPEXH9Q@mail.gmail.com/ Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: Hugh Dickins <hughd@google.com> Cc: Joel Fernandes <joel@joelfernandes.org> Cc: Kalesh Singh <kaleshsingh@google.com> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
59 lines
1.7 KiB
C
59 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _PGTABLE_NOP4D_H
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#define _PGTABLE_NOP4D_H
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#ifndef __ASSEMBLY__
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#define __PAGETABLE_P4D_FOLDED 1
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typedef struct { pgd_t pgd; } p4d_t;
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#define P4D_SHIFT PGDIR_SHIFT
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#define PTRS_PER_P4D 1
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#define P4D_SIZE (1UL << P4D_SHIFT)
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#define P4D_MASK (~(P4D_SIZE-1))
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/*
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* The "pgd_xxx()" functions here are trivial for a folded two-level
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* setup: the p4d is never bad, and a p4d always exists (as it's folded
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* into the pgd entry)
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*/
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static inline int pgd_none(pgd_t pgd) { return 0; }
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static inline int pgd_bad(pgd_t pgd) { return 0; }
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static inline int pgd_present(pgd_t pgd) { return 1; }
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static inline void pgd_clear(pgd_t *pgd) { }
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#define p4d_ERROR(p4d) (pgd_ERROR((p4d).pgd))
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#define pgd_populate(mm, pgd, p4d) do { } while (0)
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#define pgd_populate_safe(mm, pgd, p4d) do { } while (0)
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/*
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* (p4ds are folded into pgds so this doesn't get actually called,
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* but the define is needed for a generic inline function.)
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*/
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#define set_pgd(pgdptr, pgdval) set_p4d((p4d_t *)(pgdptr), (p4d_t) { pgdval })
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static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
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{
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return (p4d_t *)pgd;
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}
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#define p4d_val(x) (pgd_val((x).pgd))
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#define __p4d(x) ((p4d_t) { __pgd(x) })
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#define pgd_page(pgd) (p4d_page((p4d_t){ pgd }))
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#define pgd_page_vaddr(pgd) ((unsigned long)(p4d_pgtable((p4d_t){ pgd })))
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/*
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* allocating and freeing a p4d is trivial: the 1-entry p4d is
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* inside the pgd, so has no extra memory associated with it.
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*/
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#define p4d_alloc_one(mm, address) NULL
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#define p4d_free(mm, x) do { } while (0)
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#define p4d_free_tlb(tlb, x, a) do { } while (0)
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#undef p4d_addr_end
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#define p4d_addr_end(addr, end) (end)
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#endif /* __ASSEMBLY__ */
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#endif /* _PGTABLE_NOP4D_H */
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