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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

53
arch/powerpc/include/asm/book3s/64/pgtable.h
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@@ -88,7 +88,6 @@
#define _PAGE_SOFT_DIRTY _RPAGE_SW3 /* software: software dirty tracking */
#define _PAGE_SPECIAL _RPAGE_SW2 /* software: special page */
#define _PAGE_DEVMAP _RPAGE_SW1 /* software: ZONE_DEVICE page */
/*
* Drivers request for cache inhibited pte mapping using _PAGE_NO_CACHE
@@ -109,7 +108,7 @@
*/
#define _HPAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \
_PAGE_ACCESSED | H_PAGE_THP_HUGE | _PAGE_PTE | \
_PAGE_SOFT_DIRTY | _PAGE_DEVMAP)
_PAGE_SOFT_DIRTY)
/*
* user access blocked by key
*/
@@ -123,7 +122,7 @@
*/
#define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \
_PAGE_ACCESSED | _PAGE_SPECIAL | _PAGE_PTE | \
_PAGE_SOFT_DIRTY | _PAGE_DEVMAP)
_PAGE_SOFT_DIRTY)
/*
* We define 2 sets of base prot bits, one for basic pages (ie,
@@ -609,24 +608,6 @@ static inline pte_t pte_mkhuge(pte_t pte)
return pte;
}
static inline pte_t pte_mkdevmap(pte_t pte)
{
return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_SPECIAL | _PAGE_DEVMAP));
}
/*
* This is potentially called with a pmd as the argument, in which case it's not
* safe to check _PAGE_DEVMAP unless we also confirm that _PAGE_PTE is set.
* That's because the bit we use for _PAGE_DEVMAP is not reserved for software
* use in page directory entries (ie. non-ptes).
*/
static inline int pte_devmap(pte_t pte)
{
__be64 mask = cpu_to_be64(_PAGE_DEVMAP | _PAGE_PTE);
return (pte_raw(pte) & mask) == mask;
}
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
/* FIXME!! check whether this need to be a conditional */
@@ -1379,36 +1360,6 @@ static inline bool arch_needs_pgtable_deposit(void)
}
extern void serialize_against_pte_lookup(struct mm_struct *mm);
static inline pmd_t pmd_mkdevmap(pmd_t pmd)
{
if (radix_enabled())
return radix__pmd_mkdevmap(pmd);
return hash__pmd_mkdevmap(pmd);
}
static inline pud_t pud_mkdevmap(pud_t pud)
{
if (radix_enabled())
return radix__pud_mkdevmap(pud);
BUG();
return pud;
}
static inline int pmd_devmap(pmd_t pmd)
{
return pte_devmap(pmd_pte(pmd));
}
static inline int pud_devmap(pud_t pud)
{
return pte_devmap(pud_pte(pud));
}
static inline int pgd_devmap(pgd_t pgd)
{
return 0;
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#define __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION