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mm: remove devmap related functions and page table bits

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Now that DAX and all other reference counts to ZONE_DEVICE pages are
managed normally there is no need for the special devmap PTE/PMD/PUD page
table bits.  So drop all references to these, freeing up a software
defined page table bit on architectures supporting it.

Link: https://lkml.kernel.org/r/6389398c32cc9daa3dfcaa9f79c7972525d310ce.1750323463.git-series.apopple@nvidia.com
Signed-off-by: Alistair Popple <apopple@nvidia.com>
Acked-by: Will Deacon <will@kernel.org> # arm64
Acked-by: David Hildenbrand <david@redhat.com>
Suggested-by: Chunyan Zhang <zhang.lyra@gmail.com>
Reviewed-by: Björn Töpel <bjorn@rivosinc.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Cc: Balbir Singh <balbirs@nvidia.com>
Cc: Björn Töpel <bjorn@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Deepak Gupta <debug@rivosinc.com>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Inki Dae <m.szyprowski@samsung.com>
Cc: John Groves <john@groves.net>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Alistair Popple
2025-06-19 18:58:03 +10:00
committed by Andrew Morton
parent 28dc88c39e
commit d438d27341
25 changed files with 17 additions and 319 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
arch/riscv/include/asm/pgtable.h
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@@ -409,13 +409,6 @@ static inline int pte_special(pte_t pte)
return pte_val(pte) & _PAGE_SPECIAL;
}
#ifdef CONFIG_ARCH_HAS_PTE_DEVMAP
static inline int pte_devmap(pte_t pte)
{
return pte_val(pte) & _PAGE_DEVMAP;
}
#endif
/* static inline pte_t pte_rdprotect(pte_t pte) */
static inline pte_t pte_wrprotect(pte_t pte)
@@ -457,11 +450,6 @@ static inline pte_t pte_mkspecial(pte_t pte)
return __pte(pte_val(pte) | _PAGE_SPECIAL);
}
static inline pte_t pte_mkdevmap(pte_t pte)
{
return __pte(pte_val(pte) | _PAGE_DEVMAP);
}
static inline pte_t pte_mkhuge(pte_t pte)
{
return pte;
@@ -790,11 +778,6 @@ static inline pmd_t pmd_mkdirty(pmd_t pmd)
return pte_pmd(pte_mkdirty(pmd_pte(pmd)));
}
static inline pmd_t pmd_mkdevmap(pmd_t pmd)
{
return pte_pmd(pte_mkdevmap(pmd_pte(pmd)));
}
#ifdef CONFIG_ARCH_SUPPORTS_PMD_PFNMAP
static inline bool pmd_special(pmd_t pmd)
{
@@ -946,11 +929,6 @@ static inline pud_t pud_mkhuge(pud_t pud)
return pud;
}
static inline pud_t pud_mkdevmap(pud_t pud)
{
return pte_pud(pte_mkdevmap(pud_pte(pud)));
}
static inline int pudp_set_access_flags(struct vm_area_struct *vma,
unsigned long address, pud_t *pudp,
pud_t entry, int dirty)