mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-11-09 11:00:49 +01:00
Mike Rapoport
974b9b2c68
All architectures define pte_index() as (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1) and all architectures define pte_offset_kernel() as an entry in the array of PTEs indexed by the pte_index(). For the most architectures the pte_offset_kernel() implementation relies on the availability of pmd_page_vaddr() that converts a PMD entry value to the virtual address of the page containing PTEs array. Let's move x86 definitions of the PTE accessors to the generic place in <linux/pgtable.h> and then simply drop the respective definitions from the other architectures. The architectures that didn't provide pmd_page_vaddr() are updated to have that defined. The generic implementation of pte_offset_kernel() can be overridden by an architecture and alpha makes use of this because it has special ordering requirements for its version of pte_offset_kernel(). [[email protected]: v2] Link: http://lkml.kernel.org/r/[email protected] [[email protected]: update] Link: http://lkml.kernel.org/r/[email protected] [[email protected]: update] Link: http://lkml.kernel.org/r/[email protected] [[email protected]: fix x86 warning] [[email protected]: fix powerpc build] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Mike Rapoport <[email protected]> Signed-off-by: Stephen Rothwell <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Brian Cain <[email protected]> Cc: Catalin Marinas <[email protected]> Cc: Chris Zankel <[email protected]> Cc: "David S. Miller" <[email protected]> Cc: Geert Uytterhoeven <[email protected]> Cc: Greentime Hu <[email protected]> Cc: Greg Ungerer <[email protected]> Cc: Guan Xuetao <[email protected]> Cc: Guo Ren <[email protected]> Cc: Heiko Carstens <[email protected]> Cc: Helge Deller <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Ley Foon Tan <[email protected]> Cc: Mark Salter <[email protected]> Cc: Matthew Wilcox <[email protected]> Cc: Matt Turner <[email protected]> Cc: Max Filippov <[email protected]> Cc: Michael Ellerman <[email protected]> Cc: Michal Simek <[email protected]> Cc: Nick Hu <[email protected]> Cc: Paul Walmsley <[email protected]> Cc: Richard Weinberger <[email protected]> Cc: Rich Felker <[email protected]> Cc: Russell King <[email protected]> Cc: Stafford Horne <[email protected]> Cc: Thomas Bogendoerfer <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Tony Luck <[email protected]> Cc: Vincent Chen <[email protected]> Cc: Vineet Gupta <[email protected]> Cc: Will Deacon <[email protected]> Cc: Yoshinori Sato <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Linus Torvalds <[email protected]>
67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _PGTABLE_NOPUD_H
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#define _PGTABLE_NOPUD_H
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#ifndef __ASSEMBLY__
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#include <asm-generic/pgtable-nop4d.h>
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#define __PAGETABLE_PUD_FOLDED 1
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/*
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* Having the pud type consist of a p4d gets the size right, and allows
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* us to conceptually access the p4d entry that this pud is folded into
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* without casting.
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*/
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typedef struct { p4d_t p4d; } pud_t;
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#define PUD_SHIFT P4D_SHIFT
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#define PTRS_PER_PUD 1
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#define PUD_SIZE (1UL << PUD_SHIFT)
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#define PUD_MASK (~(PUD_SIZE-1))
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/*
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* The "p4d_xxx()" functions here are trivial for a folded two-level
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* setup: the pud is never bad, and a pud always exists (as it's folded
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* into the p4d entry)
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*/
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static inline int p4d_none(p4d_t p4d) { return 0; }
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static inline int p4d_bad(p4d_t p4d) { return 0; }
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static inline int p4d_present(p4d_t p4d) { return 1; }
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static inline void p4d_clear(p4d_t *p4d) { }
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#define pud_ERROR(pud) (p4d_ERROR((pud).p4d))
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#define p4d_populate(mm, p4d, pud) do { } while (0)
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#define p4d_populate_safe(mm, p4d, pud) do { } while (0)
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/*
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* (puds are folded into p4ds 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_p4d(p4dptr, p4dval) set_pud((pud_t *)(p4dptr), (pud_t) { p4dval })
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static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
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{
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return (pud_t *)p4d;
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}
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#define pud_offset pud_offset
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#define pud_val(x) (p4d_val((x).p4d))
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#define __pud(x) ((pud_t) { __p4d(x) })
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#define p4d_page(p4d) (pud_page((pud_t){ p4d }))
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#define p4d_page_vaddr(p4d) (pud_page_vaddr((pud_t){ p4d }))
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/*
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* allocating and freeing a pud is trivial: the 1-entry pud is
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* inside the p4d, so has no extra memory associated with it.
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*/
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#define pud_alloc_one(mm, address) NULL
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#define pud_free(mm, x) do { } while (0)
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#define pud_free_tlb(tlb, x, a) do { } while (0)
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#undef pud_addr_end
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#define pud_addr_end(addr, end) (end)
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#endif /* __ASSEMBLY__ */
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#endif /* _PGTABLE_NOPUD_H */
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