cregit-Linux how code gets into the kernel

Release 4.12 include/asm-generic/pgtable-nop4d-hack.h

#ifndef _PGTABLE_NOP4D_HACK_H

#define _PGTABLE_NOP4D_HACK_H

#ifndef __ASSEMBLY__
#include <asm-generic/5level-fixup.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
 * without casting.
 */


typedef struct { pgd_t pgd; } pud_t;


#define PUD_SHIFT	PGDIR_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
 * setup: the pud is never bad, and a pud always exists (as it's folded
 * into the pgd entry)
 */

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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Kirill A. Shutemov10100.00%1100.00%
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#define pud_ERROR(pud) (pgd_ERROR((pud).pgd)) #define pgd_populate(mm, pgd, pud) do { } while (0) /* * (puds 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_pud((pud_t *)(pgdptr), (pud_t) { pgdval })
static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address) { return (pud_t *)pgd; }

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Kirill A. Shutemov23100.00%1100.00%
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#define pud_val(x) (pgd_val((x).pgd)) #define __pud(x) ((pud_t) { __pgd(x) }) #define pgd_page(pgd) (pud_page((pud_t){ pgd })) #define pgd_page_vaddr(pgd) (pud_page_vaddr((pud_t){ pgd })) /* * allocating and freeing a pud is trivial: the 1-entry pud is * inside the pgd, 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 /* _PGTABLE_NOP4D_HACK_H */

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Kirill A. Shutemov218100.00%1100.00%
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