mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-26 12:34:41 +08:00
048456dcf2
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>
68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
#ifndef _PGTABLE_NOPUD_H
|
|
#define _PGTABLE_NOPUD_H
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#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 p4d gets the size right, and allows
|
|
* us to conceptually access the p4d entry that this pud is folded into
|
|
* without casting.
|
|
*/
|
|
typedef struct { p4d_t p4d; } pud_t;
|
|
|
|
#define PUD_SHIFT P4D_SHIFT
|
|
#define PTRS_PER_PUD 1
|
|
#define PUD_SIZE (1UL << PUD_SHIFT)
|
|
#define PUD_MASK (~(PUD_SIZE-1))
|
|
|
|
/*
|
|
* 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 p4d entry)
|
|
*/
|
|
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 p4d_populate(mm, p4d, pud) do { } while (0)
|
|
/*
|
|
* (puds are folded into p4ds so this doesn't get actually called,
|
|
* but the define is needed for a generic inline function.)
|
|
*/
|
|
#define set_p4d(p4dptr, p4dval) set_pud((pud_t *)(p4dptr), (pud_t) { p4dval })
|
|
|
|
static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
|
|
{
|
|
return (pud_t *)p4d;
|
|
}
|
|
|
|
#define pud_val(x) (p4d_val((x).p4d))
|
|
#define __pud(x) ((pud_t) { __p4d(x) })
|
|
|
|
#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 p4d, so has no extra memory associated with it.
|
|
*/
|
|
#define pud_alloc_one(mm, address) NULL
|
|
#define pud_free(mm, x) do { } while (0)
|
|
#define __pud_free_tlb(tlb, x, a) do { } while (0)
|
|
|
|
#undef pud_addr_end
|
|
#define pud_addr_end(addr, end) (end)
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
#endif /* !__ARCH_USE_5LEVEL_HACK */
|
|
#endif /* _PGTABLE_NOPUD_H */
|