linux/include/asm-generic/pgtable-nopmd.h
Aneesh Kumar K.V 9cf6fa2458 mm: rename pud_page_vaddr to pud_pgtable and make it return pmd_t *
No functional change in this patch.

[aneesh.kumar@linux.ibm.com: fix]
  Link: https://lkml.kernel.org/r/87wnqtnb60.fsf@linux.ibm.com
[sfr@canb.auug.org.au: another fix]
  Link: https://lkml.kernel.org/r/20210619134410.89559-1-aneesh.kumar@linux.ibm.com

Link: https://lkml.kernel.org/r/20210615110859.320299-1-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>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
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>
2021-07-08 11:48:22 -07:00

72 lines
1.9 KiB
C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _PGTABLE_NOPMD_H
#define _PGTABLE_NOPMD_H
#ifndef __ASSEMBLY__
#include <asm-generic/pgtable-nopud.h>
struct mm_struct;
#define __PAGETABLE_PMD_FOLDED 1
/*
* Having the pmd type consist of a pud gets the size right, and allows
* us to conceptually access the pud entry that this pmd is folded into
* without casting.
*/
typedef struct { pud_t pud; } pmd_t;
#define PMD_SHIFT PUD_SHIFT
#define PTRS_PER_PMD 1
#define PMD_SIZE (1UL << PMD_SHIFT)
#define PMD_MASK (~(PMD_SIZE-1))
/*
* The "pud_xxx()" functions here are trivial for a folded two-level
* setup: the pmd is never bad, and a pmd always exists (as it's folded
* into the pud entry)
*/
static inline int pud_none(pud_t pud) { return 0; }
static inline int pud_bad(pud_t pud) { return 0; }
static inline int pud_present(pud_t pud) { return 1; }
static inline void pud_clear(pud_t *pud) { }
#define pmd_ERROR(pmd) (pud_ERROR((pmd).pud))
#define pud_populate(mm, pmd, pte) do { } while (0)
/*
* (pmds are folded into puds so this doesn't get actually called,
* but the define is needed for a generic inline function.)
*/
#define set_pud(pudptr, pudval) set_pmd((pmd_t *)(pudptr), (pmd_t) { pudval })
static inline pmd_t * pmd_offset(pud_t * pud, unsigned long address)
{
return (pmd_t *)pud;
}
#define pmd_offset pmd_offset
#define pmd_val(x) (pud_val((x).pud))
#define __pmd(x) ((pmd_t) { __pud(x) } )
#define pud_page(pud) (pmd_page((pmd_t){ pud }))
#define pud_pgtable(pud) ((pmd_t *)(pmd_page_vaddr((pmd_t){ pud })))
/*
* allocating and freeing a pmd is trivial: the 1-entry pmd is
* inside the pud, so has no extra memory associated with it.
*/
#define pmd_alloc_one(mm, address) NULL
static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
{
}
#define pmd_free_tlb(tlb, x, a) do { } while (0)
#undef pmd_addr_end
#define pmd_addr_end(addr, end) (end)
#endif /* __ASSEMBLY__ */
#endif /* _PGTABLE_NOPMD_H */