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c087a5c324
This reverts one change in commit924bd6a8c9("mm/x86: drop two unnecessary pud_leaf() definitions"). One issue with that is it broke nopmd builds for at least both arm64 and riscv (CONFIG_PGTABLE_LEVELS=2). The other issue is it was overlooked that it's a common change rather than x86 specific (relevant to the commit message of the commit). Normally there's no need for empty definition of pXd_leaf() because of the fallback functions, however this logic may not apply to pgtable-nopmd.h, because that's a header that can even be used by arch *pgtable.h headers, which can use the *_leaf() definitions _before_ the fallback functions are defined. Leave it there to pass PGTABLE_LEVELS=2 builds. Link: https://lkml.kernel.org/r/Ze8vFNV9YSdgC2S7@x1n Fixes:924bd6a8c9("mm/x86: drop two unnecessary pud_leaf() definitions") Signed-off-by: Peter Xu <peterx@redhat.com> Reported-by: kernel test robot <lkp@intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202403090900.OwPqmRuI-lkp@intel.com/ Closes: https://lore.kernel.org/oe-kbuild-all/202403101607.a42gaLOS-lkp@intel.com/ Cc: Jason Gunthorpe <jgg@nvidia.com> Cc: Mike Rapoport (IBM) <rppt@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
74 lines
2.0 KiB
C
74 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _PGTABLE_NOPMD_H
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#define _PGTABLE_NOPMD_H
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#ifndef __ASSEMBLY__
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#include <asm-generic/pgtable-nopud.h>
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struct mm_struct;
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#define __PAGETABLE_PMD_FOLDED 1
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/*
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* Having the pmd type consist of a pud gets the size right, and allows
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* us to conceptually access the pud entry that this pmd is folded into
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* without casting.
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*/
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typedef struct { pud_t pud; } pmd_t;
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#define PMD_SHIFT PUD_SHIFT
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#define PTRS_PER_PMD 1
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#define PMD_SIZE (1UL << PMD_SHIFT)
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#define PMD_MASK (~(PMD_SIZE-1))
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/*
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* The "pud_xxx()" functions here are trivial for a folded two-level
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* setup: the pmd is never bad, and a pmd always exists (as it's folded
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* into the pud entry)
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*/
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static inline int pud_none(pud_t pud) { return 0; }
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static inline int pud_bad(pud_t pud) { return 0; }
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static inline int pud_present(pud_t pud) { return 1; }
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static inline int pud_user(pud_t pud) { return 0; }
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static inline int pud_leaf(pud_t pud) { return 0; }
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static inline void pud_clear(pud_t *pud) { }
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#define pmd_ERROR(pmd) (pud_ERROR((pmd).pud))
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#define pud_populate(mm, pmd, pte) do { } while (0)
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/*
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* (pmds are folded into puds 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_pud(pudptr, pudval) set_pmd((pmd_t *)(pudptr), (pmd_t) { pudval })
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static inline pmd_t * pmd_offset(pud_t * pud, unsigned long address)
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{
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return (pmd_t *)pud;
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}
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#define pmd_offset pmd_offset
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#define pmd_val(x) (pud_val((x).pud))
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#define __pmd(x) ((pmd_t) { __pud(x) } )
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#define pud_page(pud) (pmd_page((pmd_t){ pud }))
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#define pud_pgtable(pud) ((pmd_t *)(pmd_page_vaddr((pmd_t){ pud })))
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/*
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* allocating and freeing a pmd is trivial: the 1-entry pmd is
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* inside the pud, so has no extra memory associated with it.
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*/
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#define pmd_alloc_one(mm, address) NULL
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static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
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{
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}
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#define pmd_free_tlb(tlb, x, a) do { } while (0)
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#undef pmd_addr_end
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#define pmd_addr_end(addr, end) (end)
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#endif /* __ASSEMBLY__ */
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#endif /* _PGTABLE_NOPMD_H */
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