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asm-generic: introduce <asm-generic/pgtable-nop4d.h>

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Like with pgtable-nopud.h for 4-level paging, this new header is base
for converting an architectures to properly folded p4d_t level.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kirill A. Shutemov 2017-03-09 17:24:06 +03:00 committed by Linus Torvalds
parent 9849a5697d
commit 048456dcf2
3 changed files with 89 additions and 24 deletions
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56
include/asm-generic/pgtable-nop4d.h Normal file
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@ -0,0 +1,56 @@
#ifndef _PGTABLE_NOP4D_H
#define _PGTABLE_NOP4D_H
#ifndef __ASSEMBLY__
#define __PAGETABLE_P4D_FOLDED
typedef struct { pgd_t pgd; } p4d_t;
#define P4D_SHIFT PGDIR_SHIFT
#define PTRS_PER_P4D 1
#define P4D_SIZE (1UL << P4D_SHIFT)
#define P4D_MASK (~(P4D_SIZE-1))
/*
* The "pgd_xxx()" functions here are trivial for a folded two-level
* setup: the p4d is never bad, and a p4d always exists (as it's folded
* into the pgd entry)
*/
static inline int pgd_none(pgd_t pgd) { return 0; }
static inline int pgd_bad(pgd_t pgd) { return 0; }
static inline int pgd_present(pgd_t pgd) { return 1; }
static inline void pgd_clear(pgd_t *pgd) { }
#define p4d_ERROR(p4d) (pgd_ERROR((p4d).pgd))
#define pgd_populate(mm, pgd, p4d) do { } while (0)
/*
* (p4ds are folded into pgds so this doesn't get actually called,
* but the define is needed for a generic inline function.)
*/
#define set_pgd(pgdptr, pgdval) set_p4d((p4d_t *)(pgdptr), (p4d_t) { pgdval })
static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
{
return (p4d_t *)pgd;
}
#define p4d_val(x) (pgd_val((x).pgd))
#define __p4d(x) ((p4d_t) { __pgd(x) })
#define pgd_page(pgd) (p4d_page((p4d_t){ pgd }))
#define pgd_page_vaddr(pgd) (p4d_page_vaddr((p4d_t){ pgd }))
/*
* allocating and freeing a p4d is trivial: the 1-entry p4d is
* inside the pgd, so has no extra memory associated with it.
*/
#define p4d_alloc_one(mm, address) NULL
#define p4d_free(mm, x) do { } while (0)
#define __p4d_free_tlb(tlb, x, a) do { } while (0)
#undef p4d_addr_end
#define p4d_addr_end(addr, end) (end)
#endif /* __ASSEMBLY__ */
#endif /* _PGTABLE_NOP4D_H */

43
include/asm-generic/pgtable-nopud.h
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@ -6,53 +6,54 @@
#ifdef __ARCH_USE_5LEVEL_HACK
#include <asm-generic/pgtable-nop4d-hack.h>
#else
#include <asm-generic/pgtable-nop4d.h>
#define __PAGETABLE_PUD_FOLDED
/*
* Having the pud type consist of a pgd gets the size right, and allows
* us to conceptually access the pgd entry that this pud is folded into
* Having the pud type consist of a p4d gets the size right, and allows
* us to conceptually access the p4d entry that this pud is folded into
* without casting.
*/
typedef struct { pgd_t pgd; } pud_t;
typedef struct { p4d_t p4d; } pud_t;
#define PUD_SHIFT PGDIR_SHIFT
#define PUD_SHIFT P4D_SHIFT
#define PTRS_PER_PUD 1
#define PUD_SIZE (1UL << PUD_SHIFT)
#define PUD_MASK (~(PUD_SIZE-1))
/*
* The "pgd_xxx()" functions here are trivial for a folded two-level
* The "p4d_xxx()" functions here are trivial for a folded two-level
* setup: the pud is never bad, and a pud always exists (as it's folded
* into the pgd entry)
* into the p4d entry)
*/
static inline int pgd_none(pgd_t pgd) { return 0; }
static inline int pgd_bad(pgd_t pgd) { return 0; }
static inline int pgd_present(pgd_t pgd) { return 1; }
static inline void pgd_clear(pgd_t *pgd) { }
#define pud_ERROR(pud) (pgd_ERROR((pud).pgd))
static inline int p4d_none(p4d_t p4d) { return 0; }
static inline int p4d_bad(p4d_t p4d) { return 0; }
static inline int p4d_present(p4d_t p4d) { return 1; }
static inline void p4d_clear(p4d_t *p4d) { }
#define pud_ERROR(pud) (p4d_ERROR((pud).p4d))
#define pgd_populate(mm, pgd, pud) do { } while (0)
#define p4d_populate(mm, p4d, pud) do { } while (0)
/*
* (puds are folded into pgds so this doesn't get actually called,
* (puds are folded into p4ds so this doesn't get actually called,
* but the define is needed for a generic inline function.)
*/
#define set_pgd(pgdptr, pgdval) set_pud((pud_t *)(pgdptr), (pud_t) { pgdval })
#define set_p4d(p4dptr, p4dval) set_pud((pud_t *)(p4dptr), (pud_t) { p4dval })
static inline pud_t * pud_offset(pgd_t * pgd, unsigned long address)
static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
{
return (pud_t *)pgd;
return (pud_t *)p4d;
}
#define pud_val(x) (pgd_val((x).pgd))
#define __pud(x) ((pud_t) { __pgd(x) } )
#define pud_val(x) (p4d_val((x).p4d))
#define __pud(x) ((pud_t) { __p4d(x) })
#define pgd_page(pgd) (pud_page((pud_t){ pgd }))
#define pgd_page_vaddr(pgd) (pud_page_vaddr((pud_t){ pgd }))
#define p4d_page(p4d) (pud_page((pud_t){ p4d }))
#define p4d_page_vaddr(p4d) (pud_page_vaddr((pud_t){ p4d }))
/*
* allocating and freeing a pud is trivial: the 1-entry pud is
* inside the pgd, so has no extra memory associated with it.
* inside the p4d, so has no extra memory associated with it.
*/
#define pud_alloc_one(mm, address) NULL
#define pud_free(mm, x) do { } while (0)

14
include/asm-generic/tlb.h
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@ -270,6 +270,12 @@ static inline void tlb_remove_check_page_size_change(struct mmu_gather *tlb,
__pte_free_tlb(tlb, ptep, address); \
} while (0)
#define pmd_free_tlb(tlb, pmdp, address) \
do { \
__tlb_adjust_range(tlb, address, PAGE_SIZE); \
__pmd_free_tlb(tlb, pmdp, address); \
} while (0)
#ifndef __ARCH_HAS_4LEVEL_HACK
#define pud_free_tlb(tlb, pudp, address) \
do { \
@ -278,11 +284,13 @@ static inline void tlb_remove_check_page_size_change(struct mmu_gather *tlb,
} while (0)
#endif
#define pmd_free_tlb(tlb, pmdp, address) \
#ifndef __ARCH_HAS_5LEVEL_HACK
#define p4d_free_tlb(tlb, pudp, address) \
do { \
__tlb_adjust_range(tlb, address, PAGE_SIZE); \
__pmd_free_tlb(tlb, pmdp, address); \
__tlb_adjust_range(tlb, address, PAGE_SIZE); \
__p4d_free_tlb(tlb, pudp, address); \
} while (0)
#endif
#define tlb_migrate_finish(mm) do {} while (0)