* [merged mm-stable] mm-remove-devmap-related-functions-and-page-table-bits.patch removed from -mm tree
@ 2025-07-10 5:45 Andrew Morton
0 siblings, 0 replies; only message in thread
From: Andrew Morton @ 2025-07-10 5:45 UTC (permalink / raw)
To: mm-commits, zhang.lyra, willy, will, m.szyprowski,
lorenzo.stoakes, john, jhubbard, jgg, hch, gerald.schaefer, debug,
david, dan.j.williams, bjorn, bjorn, balbirs, apopple, akpm
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain, Size: 31233 bytes --]
The quilt patch titled
Subject: mm: remove devmap related functions and page table bits
has been removed from the -mm tree. Its filename was
mm-remove-devmap-related-functions-and-page-table-bits.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: Alistair Popple <apopple@nvidia.com>
Subject: mm: remove devmap related functions and page table bits
Date: Thu, 19 Jun 2025 18:58:03 +1000
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>
---
Documentation/mm/arch_pgtable_helpers.rst | 6 -
arch/arm64/Kconfig | 1
arch/arm64/include/asm/pgtable-prot.h | 1
arch/arm64/include/asm/pgtable.h | 24 ------
arch/loongarch/Kconfig | 1
arch/loongarch/include/asm/pgtable-bits.h | 6 -
arch/loongarch/include/asm/pgtable.h | 19 -----
arch/powerpc/Kconfig | 1
arch/powerpc/include/asm/book3s/64/hash-4k.h | 6 -
arch/powerpc/include/asm/book3s/64/hash-64k.h | 7 -
arch/powerpc/include/asm/book3s/64/pgtable.h | 53 --------------
arch/powerpc/include/asm/book3s/64/radix.h | 14 ---
arch/riscv/Kconfig | 1
arch/riscv/include/asm/pgtable-64.h | 16 ----
arch/riscv/include/asm/pgtable-bits.h | 1
arch/riscv/include/asm/pgtable.h | 22 -----
arch/x86/Kconfig | 1
arch/x86/include/asm/pgtable.h | 51 -------------
arch/x86/include/asm/pgtable_types.h | 5 -
include/linux/mm.h | 7 -
include/linux/pgtable.h | 19 -----
mm/Kconfig | 4 -
mm/debug_vm_pgtable.c | 59 ----------------
mm/hmm.c | 3
mm/madvise.c | 8 +-
25 files changed, 17 insertions(+), 319 deletions(-)
--- a/arch/arm64/include/asm/pgtable.h~mm-remove-devmap-related-functions-and-page-table-bits
+++ a/arch/arm64/include/asm/pgtable.h
@@ -190,7 +190,6 @@ static inline pteval_t __phys_to_pte_val
#define pte_user(pte) (!!(pte_val(pte) & PTE_USER))
#define pte_user_exec(pte) (!(pte_val(pte) & PTE_UXN))
#define pte_cont(pte) (!!(pte_val(pte) & PTE_CONT))
-#define pte_devmap(pte) (!!(pte_val(pte) & PTE_DEVMAP))
#define pte_tagged(pte) ((pte_val(pte) & PTE_ATTRINDX_MASK) == \
PTE_ATTRINDX(MT_NORMAL_TAGGED))
@@ -372,11 +371,6 @@ static inline pmd_t pmd_mkcont(pmd_t pmd
return __pmd(pmd_val(pmd) | PMD_SECT_CONT);
}
-static inline pte_t pte_mkdevmap(pte_t pte)
-{
- return set_pte_bit(pte, __pgprot(PTE_DEVMAP | PTE_SPECIAL));
-}
-
#ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
static inline int pte_uffd_wp(pte_t pte)
{
@@ -653,14 +647,6 @@ static inline pmd_t pmd_mkhuge(pmd_t pmd
return __pmd((pmd_val(pmd) & ~mask) | val);
}
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-#define pmd_devmap(pmd) pte_devmap(pmd_pte(pmd))
-#endif
-static inline pmd_t pmd_mkdevmap(pmd_t pmd)
-{
- return pte_pmd(set_pte_bit(pmd_pte(pmd), __pgprot(PTE_DEVMAP)));
-}
-
#ifdef CONFIG_ARCH_SUPPORTS_PMD_PFNMAP
#define pmd_special(pte) (!!((pmd_val(pte) & PTE_SPECIAL)))
static inline pmd_t pmd_mkspecial(pmd_t pmd)
@@ -1302,16 +1288,6 @@ static inline int pmdp_set_access_flags(
return __ptep_set_access_flags(vma, address, (pte_t *)pmdp,
pmd_pte(entry), dirty);
}
-
-static inline int pud_devmap(pud_t pud)
-{
- return 0;
-}
-
-static inline int pgd_devmap(pgd_t pgd)
-{
- return 0;
-}
#endif
#ifdef CONFIG_PAGE_TABLE_CHECK
--- a/arch/arm64/include/asm/pgtable-prot.h~mm-remove-devmap-related-functions-and-page-table-bits
+++ a/arch/arm64/include/asm/pgtable-prot.h
@@ -17,7 +17,6 @@
#define PTE_SWP_EXCLUSIVE (_AT(pteval_t, 1) << 2) /* only for swp ptes */
#define PTE_DIRTY (_AT(pteval_t, 1) << 55)
#define PTE_SPECIAL (_AT(pteval_t, 1) << 56)
-#define PTE_DEVMAP (_AT(pteval_t, 1) << 57)
/*
* PTE_PRESENT_INVALID=1 & PTE_VALID=0 indicates that the pte's fields should be
--- a/arch/arm64/Kconfig~mm-remove-devmap-related-functions-and-page-table-bits
+++ a/arch/arm64/Kconfig
@@ -44,7 +44,6 @@ config ARM64
select ARCH_HAS_NONLEAF_PMD_YOUNG if ARM64_HAFT
select ARCH_HAS_PREEMPT_LAZY
select ARCH_HAS_PTDUMP
- select ARCH_HAS_PTE_DEVMAP
select ARCH_HAS_PTE_SPECIAL
select ARCH_HAS_HW_PTE_YOUNG
select ARCH_HAS_SETUP_DMA_OPS
--- a/arch/loongarch/include/asm/pgtable-bits.h~mm-remove-devmap-related-functions-and-page-table-bits
+++ a/arch/loongarch/include/asm/pgtable-bits.h
@@ -22,7 +22,6 @@
#define _PAGE_PFN_SHIFT 12
#define _PAGE_SWP_EXCLUSIVE_SHIFT 23
#define _PAGE_PFN_END_SHIFT 48
-#define _PAGE_DEVMAP_SHIFT 59
#define _PAGE_PRESENT_INVALID_SHIFT 60
#define _PAGE_NO_READ_SHIFT 61
#define _PAGE_NO_EXEC_SHIFT 62
@@ -36,7 +35,6 @@
#define _PAGE_MODIFIED (_ULCAST_(1) << _PAGE_MODIFIED_SHIFT)
#define _PAGE_PROTNONE (_ULCAST_(1) << _PAGE_PROTNONE_SHIFT)
#define _PAGE_SPECIAL (_ULCAST_(1) << _PAGE_SPECIAL_SHIFT)
-#define _PAGE_DEVMAP (_ULCAST_(1) << _PAGE_DEVMAP_SHIFT)
/* We borrow bit 23 to store the exclusive marker in swap PTEs. */
#define _PAGE_SWP_EXCLUSIVE (_ULCAST_(1) << _PAGE_SWP_EXCLUSIVE_SHIFT)
@@ -76,8 +74,8 @@
#define __READABLE (_PAGE_VALID)
#define __WRITEABLE (_PAGE_DIRTY | _PAGE_WRITE)
-#define _PAGE_CHG_MASK (_PAGE_MODIFIED | _PAGE_SPECIAL | _PAGE_DEVMAP | _PFN_MASK | _CACHE_MASK | _PAGE_PLV)
-#define _HPAGE_CHG_MASK (_PAGE_MODIFIED | _PAGE_SPECIAL | _PAGE_DEVMAP | _PFN_MASK | _CACHE_MASK | _PAGE_PLV | _PAGE_HUGE)
+#define _PAGE_CHG_MASK (_PAGE_MODIFIED | _PAGE_SPECIAL | _PFN_MASK | _CACHE_MASK | _PAGE_PLV)
+#define _HPAGE_CHG_MASK (_PAGE_MODIFIED | _PAGE_SPECIAL | _PFN_MASK | _CACHE_MASK | _PAGE_PLV | _PAGE_HUGE)
#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_NO_READ | \
_PAGE_USER | _CACHE_CC)
--- a/arch/loongarch/include/asm/pgtable.h~mm-remove-devmap-related-functions-and-page-table-bits
+++ a/arch/loongarch/include/asm/pgtable.h
@@ -409,9 +409,6 @@ static inline int pte_special(pte_t pte)
static inline pte_t pte_mkspecial(pte_t pte) { pte_val(pte) |= _PAGE_SPECIAL; return pte; }
#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
-static inline int pte_devmap(pte_t pte) { return !!(pte_val(pte) & _PAGE_DEVMAP); }
-static inline pte_t pte_mkdevmap(pte_t pte) { pte_val(pte) |= _PAGE_DEVMAP; return pte; }
-
#define pte_accessible pte_accessible
static inline unsigned long pte_accessible(struct mm_struct *mm, pte_t a)
{
@@ -540,17 +537,6 @@ static inline pmd_t pmd_mkyoung(pmd_t pm
return pmd;
}
-static inline int pmd_devmap(pmd_t pmd)
-{
- return !!(pmd_val(pmd) & _PAGE_DEVMAP);
-}
-
-static inline pmd_t pmd_mkdevmap(pmd_t pmd)
-{
- pmd_val(pmd) |= _PAGE_DEVMAP;
- return pmd;
-}
-
static inline struct page *pmd_page(pmd_t pmd)
{
if (pmd_trans_huge(pmd))
@@ -606,11 +592,6 @@ static inline long pmd_protnone(pmd_t pm
#define pmd_leaf(pmd) ((pmd_val(pmd) & _PAGE_HUGE) != 0)
#define pud_leaf(pud) ((pud_val(pud) & _PAGE_HUGE) != 0)
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-#define pud_devmap(pud) (0)
-#define pgd_devmap(pgd) (0)
-#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
-
/*
* We provide our own get_unmapped area to cope with the virtual aliasing
* constraints placed on us by the cache architecture.
--- a/arch/loongarch/Kconfig~mm-remove-devmap-related-functions-and-page-table-bits
+++ a/arch/loongarch/Kconfig
@@ -25,7 +25,6 @@ config LOONGARCH
select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
select ARCH_HAS_PREEMPT_LAZY
- select ARCH_HAS_PTE_DEVMAP
select ARCH_HAS_PTE_SPECIAL
select ARCH_HAS_SET_MEMORY
select ARCH_HAS_SET_DIRECT_MAP
--- a/arch/powerpc/include/asm/book3s/64/hash-4k.h~mm-remove-devmap-related-functions-and-page-table-bits
+++ a/arch/powerpc/include/asm/book3s/64/hash-4k.h
@@ -168,12 +168,6 @@ extern pmd_t hash__pmdp_huge_get_and_cle
extern int hash__has_transparent_hugepage(void);
#endif
-static inline pmd_t hash__pmd_mkdevmap(pmd_t pmd)
-{
- BUG();
- return pmd;
-}
-
#endif /* !__ASSEMBLY__ */
#endif /* _ASM_POWERPC_BOOK3S_64_HASH_4K_H */
--- a/arch/powerpc/include/asm/book3s/64/hash-64k.h~mm-remove-devmap-related-functions-and-page-table-bits
+++ a/arch/powerpc/include/asm/book3s/64/hash-64k.h
@@ -259,7 +259,7 @@ static inline void mark_hpte_slot_valid(
*/
static inline int hash__pmd_trans_huge(pmd_t pmd)
{
- return !!((pmd_val(pmd) & (_PAGE_PTE | H_PAGE_THP_HUGE | _PAGE_DEVMAP)) ==
+ return !!((pmd_val(pmd) & (_PAGE_PTE | H_PAGE_THP_HUGE)) ==
(_PAGE_PTE | H_PAGE_THP_HUGE));
}
@@ -281,11 +281,6 @@ extern pmd_t hash__pmdp_huge_get_and_cle
extern int hash__has_transparent_hugepage(void);
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
-static inline pmd_t hash__pmd_mkdevmap(pmd_t pmd)
-{
- return __pmd(pmd_val(pmd) | (_PAGE_PTE | H_PAGE_THP_HUGE | _PAGE_DEVMAP));
-}
-
#endif /* __ASSEMBLY__ */
#endif /* _ASM_POWERPC_BOOK3S_64_HASH_64K_H */
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h~mm-remove-devmap-related-functions-and-page-table-bits
+++ a/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -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_de
}
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
--- a/arch/powerpc/include/asm/book3s/64/radix.h~mm-remove-devmap-related-functions-and-page-table-bits
+++ a/arch/powerpc/include/asm/book3s/64/radix.h
@@ -264,7 +264,7 @@ static inline int radix__p4d_bad(p4d_t p
static inline int radix__pmd_trans_huge(pmd_t pmd)
{
- return (pmd_val(pmd) & (_PAGE_PTE | _PAGE_DEVMAP)) == _PAGE_PTE;
+ return (pmd_val(pmd) & _PAGE_PTE) == _PAGE_PTE;
}
static inline pmd_t radix__pmd_mkhuge(pmd_t pmd)
@@ -274,7 +274,7 @@ static inline pmd_t radix__pmd_mkhuge(pm
static inline int radix__pud_trans_huge(pud_t pud)
{
- return (pud_val(pud) & (_PAGE_PTE | _PAGE_DEVMAP)) == _PAGE_PTE;
+ return (pud_val(pud) & _PAGE_PTE) == _PAGE_PTE;
}
static inline pud_t radix__pud_mkhuge(pud_t pud)
@@ -315,16 +315,6 @@ static inline int radix__has_transparent
}
#endif
-static inline pmd_t radix__pmd_mkdevmap(pmd_t pmd)
-{
- return __pmd(pmd_val(pmd) | (_PAGE_PTE | _PAGE_DEVMAP));
-}
-
-static inline pud_t radix__pud_mkdevmap(pud_t pud)
-{
- return __pud(pud_val(pud) | (_PAGE_PTE | _PAGE_DEVMAP));
-}
-
struct vmem_altmap;
struct dev_pagemap;
extern int __meminit radix__vmemmap_create_mapping(unsigned long start,
--- a/arch/powerpc/Kconfig~mm-remove-devmap-related-functions-and-page-table-bits
+++ a/arch/powerpc/Kconfig
@@ -149,7 +149,6 @@ config PPC
select ARCH_HAS_PMEM_API
select ARCH_HAS_PREEMPT_LAZY
select ARCH_HAS_PTDUMP
- select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
select ARCH_HAS_PTE_SPECIAL
select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
select ARCH_HAS_SET_MEMORY
--- a/arch/riscv/include/asm/pgtable-64.h~mm-remove-devmap-related-functions-and-page-table-bits
+++ a/arch/riscv/include/asm/pgtable-64.h
@@ -397,24 +397,8 @@ static inline struct page *pgd_page(pgd_
p4d_t *p4d_offset(pgd_t *pgd, unsigned long address);
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-static inline int pte_devmap(pte_t pte);
static inline pte_t pmd_pte(pmd_t pmd);
static inline pte_t pud_pte(pud_t 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
#endif /* _ASM_RISCV_PGTABLE_64_H */
--- a/arch/riscv/include/asm/pgtable-bits.h~mm-remove-devmap-related-functions-and-page-table-bits
+++ a/arch/riscv/include/asm/pgtable-bits.h
@@ -19,7 +19,6 @@
#define _PAGE_SOFT (3 << 8) /* Reserved for software */
#define _PAGE_SPECIAL (1 << 8) /* RSW: 0x1 */
-#define _PAGE_DEVMAP (1 << 9) /* RSW, devmap */
#define _PAGE_TABLE _PAGE_PRESENT
/*
--- a/arch/riscv/include/asm/pgtable.h~mm-remove-devmap-related-functions-and-page-table-bits
+++ a/arch/riscv/include/asm/pgtable.h
@@ -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
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 pm
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)
--- a/arch/riscv/Kconfig~mm-remove-devmap-related-functions-and-page-table-bits
+++ a/arch/riscv/Kconfig
@@ -46,7 +46,6 @@ config RISCV
select ARCH_HAS_PREEMPT_LAZY
select ARCH_HAS_PREPARE_SYNC_CORE_CMD
select ARCH_HAS_PTDUMP if MMU
- select ARCH_HAS_PTE_DEVMAP if 64BIT && MMU
select ARCH_HAS_PTE_SPECIAL
select ARCH_HAS_SET_DIRECT_MAP if MMU
select ARCH_HAS_SET_MEMORY if MMU
--- a/arch/x86/include/asm/pgtable.h~mm-remove-devmap-related-functions-and-page-table-bits
+++ a/arch/x86/include/asm/pgtable.h
@@ -301,16 +301,15 @@ static inline bool pmd_leaf(pmd_t pte)
}
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-/* NOTE: when predicate huge page, consider also pmd_devmap, or use pmd_leaf */
static inline int pmd_trans_huge(pmd_t pmd)
{
- return (pmd_val(pmd) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE;
+ return (pmd_val(pmd) & _PAGE_PSE) == _PAGE_PSE;
}
#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
static inline int pud_trans_huge(pud_t pud)
{
- return (pud_val(pud) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE;
+ return (pud_val(pud) & _PAGE_PSE) == _PAGE_PSE;
}
#endif
@@ -320,24 +319,6 @@ static inline int has_transparent_hugepa
return boot_cpu_has(X86_FEATURE_PSE);
}
-#ifdef CONFIG_ARCH_HAS_PTE_DEVMAP
-static inline int pmd_devmap(pmd_t pmd)
-{
- return !!(pmd_val(pmd) & _PAGE_DEVMAP);
-}
-
-#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
-static inline int pud_devmap(pud_t pud)
-{
- return !!(pud_val(pud) & _PAGE_DEVMAP);
-}
-#else
-static inline int pud_devmap(pud_t pud)
-{
- return 0;
-}
-#endif
-
#ifdef CONFIG_ARCH_SUPPORTS_PMD_PFNMAP
static inline bool pmd_special(pmd_t pmd)
{
@@ -361,12 +342,6 @@ static inline pud_t pud_mkspecial(pud_t
return pud_set_flags(pud, _PAGE_SPECIAL);
}
#endif /* CONFIG_ARCH_SUPPORTS_PUD_PFNMAP */
-
-static inline int pgd_devmap(pgd_t pgd)
-{
- return 0;
-}
-#endif
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
@@ -527,11 +502,6 @@ static inline pte_t pte_mkspecial(pte_t
return pte_set_flags(pte, _PAGE_SPECIAL);
}
-static inline pte_t pte_mkdevmap(pte_t pte)
-{
- return pte_set_flags(pte, _PAGE_SPECIAL|_PAGE_DEVMAP);
-}
-
/* See comments above mksaveddirty_shift() */
static inline pmd_t pmd_mksaveddirty(pmd_t pmd)
{
@@ -603,11 +573,6 @@ static inline pmd_t pmd_mkwrite_shstk(pm
return pmd_set_flags(pmd, _PAGE_DIRTY);
}
-static inline pmd_t pmd_mkdevmap(pmd_t pmd)
-{
- return pmd_set_flags(pmd, _PAGE_DEVMAP);
-}
-
static inline pmd_t pmd_mkhuge(pmd_t pmd)
{
return pmd_set_flags(pmd, _PAGE_PSE);
@@ -673,11 +638,6 @@ static inline pud_t pud_mkdirty(pud_t pu
return pud_mksaveddirty(pud);
}
-static inline pud_t pud_mkdevmap(pud_t pud)
-{
- return pud_set_flags(pud, _PAGE_DEVMAP);
-}
-
static inline pud_t pud_mkhuge(pud_t pud)
{
return pud_set_flags(pud, _PAGE_PSE);
@@ -1008,13 +968,6 @@ static inline int pte_present(pte_t a)
return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
}
-#ifdef CONFIG_ARCH_HAS_PTE_DEVMAP
-static inline int pte_devmap(pte_t a)
-{
- return (pte_flags(a) & _PAGE_DEVMAP) == _PAGE_DEVMAP;
-}
-#endif
-
#define pte_accessible pte_accessible
static inline bool pte_accessible(struct mm_struct *mm, pte_t a)
{
--- a/arch/x86/include/asm/pgtable_types.h~mm-remove-devmap-related-functions-and-page-table-bits
+++ a/arch/x86/include/asm/pgtable_types.h
@@ -34,7 +34,6 @@
#define _PAGE_BIT_UFFD_WP _PAGE_BIT_SOFTW2 /* userfaultfd wrprotected */
#define _PAGE_BIT_SOFT_DIRTY _PAGE_BIT_SOFTW3 /* software dirty tracking */
#define _PAGE_BIT_KERNEL_4K _PAGE_BIT_SOFTW3 /* page must not be converted to large */
-#define _PAGE_BIT_DEVMAP _PAGE_BIT_SOFTW4
#ifdef CONFIG_X86_64
#define _PAGE_BIT_SAVED_DIRTY _PAGE_BIT_SOFTW5 /* Saved Dirty bit (leaf) */
@@ -121,11 +120,9 @@
#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
#define _PAGE_NX (_AT(pteval_t, 1) << _PAGE_BIT_NX)
-#define _PAGE_DEVMAP (_AT(u64, 1) << _PAGE_BIT_DEVMAP)
#define _PAGE_SOFTW4 (_AT(pteval_t, 1) << _PAGE_BIT_SOFTW4)
#else
#define _PAGE_NX (_AT(pteval_t, 0))
-#define _PAGE_DEVMAP (_AT(pteval_t, 0))
#define _PAGE_SOFTW4 (_AT(pteval_t, 0))
#endif
@@ -154,7 +151,7 @@
#define _COMMON_PAGE_CHG_MASK (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT | \
_PAGE_SPECIAL | _PAGE_ACCESSED | \
_PAGE_DIRTY_BITS | _PAGE_SOFT_DIRTY | \
- _PAGE_DEVMAP | _PAGE_CC | _PAGE_UFFD_WP)
+ _PAGE_CC | _PAGE_UFFD_WP)
#define _PAGE_CHG_MASK (_COMMON_PAGE_CHG_MASK | _PAGE_PAT)
#define _HPAGE_CHG_MASK (_COMMON_PAGE_CHG_MASK | _PAGE_PSE | _PAGE_PAT_LARGE)
--- a/arch/x86/Kconfig~mm-remove-devmap-related-functions-and-page-table-bits
+++ a/arch/x86/Kconfig
@@ -101,7 +101,6 @@ config X86
select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
select ARCH_HAS_PMEM_API if X86_64
select ARCH_HAS_PREEMPT_LAZY
- select ARCH_HAS_PTE_DEVMAP if X86_64
select ARCH_HAS_PTE_SPECIAL
select ARCH_HAS_HW_PTE_YOUNG
select ARCH_HAS_NONLEAF_PMD_YOUNG if PGTABLE_LEVELS > 2
--- a/Documentation/mm/arch_pgtable_helpers.rst~mm-remove-devmap-related-functions-and-page-table-bits
+++ a/Documentation/mm/arch_pgtable_helpers.rst
@@ -30,8 +30,6 @@ PTE Page Table Helpers
+---------------------------+--------------------------------------------------+
| pte_protnone | Tests a PROT_NONE PTE |
+---------------------------+--------------------------------------------------+
-| pte_devmap | Tests a ZONE_DEVICE mapped PTE |
-+---------------------------+--------------------------------------------------+
| pte_soft_dirty | Tests a soft dirty PTE |
+---------------------------+--------------------------------------------------+
| pte_swp_soft_dirty | Tests a soft dirty swapped PTE |
@@ -104,8 +102,6 @@ PMD Page Table Helpers
+---------------------------+--------------------------------------------------+
| pmd_protnone | Tests a PROT_NONE PMD |
+---------------------------+--------------------------------------------------+
-| pmd_devmap | Tests a ZONE_DEVICE mapped PMD |
-+---------------------------+--------------------------------------------------+
| pmd_soft_dirty | Tests a soft dirty PMD |
+---------------------------+--------------------------------------------------+
| pmd_swp_soft_dirty | Tests a soft dirty swapped PMD |
@@ -177,8 +173,6 @@ PUD Page Table Helpers
+---------------------------+--------------------------------------------------+
| pud_write | Tests a writable PUD |
+---------------------------+--------------------------------------------------+
-| pud_devmap | Tests a ZONE_DEVICE mapped PUD |
-+---------------------------+--------------------------------------------------+
| pud_mkyoung | Creates a young PUD |
+---------------------------+--------------------------------------------------+
| pud_mkold | Creates an old PUD |
--- a/include/linux/mm.h~mm-remove-devmap-related-functions-and-page-table-bits
+++ a/include/linux/mm.h
@@ -2704,13 +2704,6 @@ static inline pud_t pud_mkspecial(pud_t
}
#endif /* CONFIG_ARCH_SUPPORTS_PUD_PFNMAP */
-#ifndef CONFIG_ARCH_HAS_PTE_DEVMAP
-static inline int pte_devmap(pte_t pte)
-{
- return 0;
-}
-#endif
-
extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr,
spinlock_t **ptl);
static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr,
--- a/include/linux/pgtable.h~mm-remove-devmap-related-functions-and-page-table-bits
+++ a/include/linux/pgtable.h
@@ -1643,21 +1643,6 @@ static inline int pud_write(pud_t pud)
}
#endif /* pud_write */
-#if !defined(CONFIG_ARCH_HAS_PTE_DEVMAP) || !defined(CONFIG_TRANSPARENT_HUGEPAGE)
-static inline int pmd_devmap(pmd_t pmd)
-{
- return 0;
-}
-static inline int pud_devmap(pud_t pud)
-{
- return 0;
-}
-static inline int pgd_devmap(pgd_t pgd)
-{
- return 0;
-}
-#endif
-
#if !defined(CONFIG_TRANSPARENT_HUGEPAGE) || \
!defined(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD)
static inline int pud_trans_huge(pud_t pud)
@@ -1912,8 +1897,8 @@ typedef unsigned int pgtbl_mod_mask;
* - It should contain a huge PFN, which points to a huge page larger than
* PAGE_SIZE of the platform. The PFN format isn't important here.
*
- * - It should cover all kinds of huge mappings (e.g., pXd_trans_huge(),
- * pXd_devmap(), or hugetlb mappings).
+ * - It should cover all kinds of huge mappings (i.e. pXd_trans_huge()
+ * or hugetlb mappings).
*/
#ifndef pgd_leaf
#define pgd_leaf(x) false
--- a/mm/debug_vm_pgtable.c~mm-remove-devmap-related-functions-and-page-table-bits
+++ a/mm/debug_vm_pgtable.c
@@ -348,12 +348,6 @@ static void __init pud_advanced_tests(st
vaddr &= HPAGE_PUD_MASK;
pud = pfn_pud(args->pud_pfn, args->page_prot);
- /*
- * Some architectures have debug checks to make sure
- * huge pud mapping are only found with devmap entries
- * For now test with only devmap entries.
- */
- pud = pud_mkdevmap(pud);
set_pud_at(args->mm, vaddr, args->pudp, pud);
flush_dcache_page(page);
pudp_set_wrprotect(args->mm, vaddr, args->pudp);
@@ -366,7 +360,6 @@ static void __init pud_advanced_tests(st
WARN_ON(!pud_none(pud));
#endif /* __PAGETABLE_PMD_FOLDED */
pud = pfn_pud(args->pud_pfn, args->page_prot);
- pud = pud_mkdevmap(pud);
pud = pud_wrprotect(pud);
pud = pud_mkclean(pud);
set_pud_at(args->mm, vaddr, args->pudp, pud);
@@ -384,7 +377,6 @@ static void __init pud_advanced_tests(st
#endif /* __PAGETABLE_PMD_FOLDED */
pud = pfn_pud(args->pud_pfn, args->page_prot);
- pud = pud_mkdevmap(pud);
pud = pud_mkyoung(pud);
set_pud_at(args->mm, vaddr, args->pudp, pud);
flush_dcache_page(page);
@@ -693,53 +685,6 @@ static void __init pmd_protnone_tests(st
static void __init pmd_protnone_tests(struct pgtable_debug_args *args) { }
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
-#ifdef CONFIG_ARCH_HAS_PTE_DEVMAP
-static void __init pte_devmap_tests(struct pgtable_debug_args *args)
-{
- pte_t pte = pfn_pte(args->fixed_pte_pfn, args->page_prot);
-
- pr_debug("Validating PTE devmap\n");
- WARN_ON(!pte_devmap(pte_mkdevmap(pte)));
-}
-
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-static void __init pmd_devmap_tests(struct pgtable_debug_args *args)
-{
- pmd_t pmd;
-
- if (!has_transparent_hugepage())
- return;
-
- pr_debug("Validating PMD devmap\n");
- pmd = pfn_pmd(args->fixed_pmd_pfn, args->page_prot);
- WARN_ON(!pmd_devmap(pmd_mkdevmap(pmd)));
-}
-
-#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
-static void __init pud_devmap_tests(struct pgtable_debug_args *args)
-{
- pud_t pud;
-
- if (!has_transparent_pud_hugepage())
- return;
-
- pr_debug("Validating PUD devmap\n");
- pud = pfn_pud(args->fixed_pud_pfn, args->page_prot);
- WARN_ON(!pud_devmap(pud_mkdevmap(pud)));
-}
-#else /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
-static void __init pud_devmap_tests(struct pgtable_debug_args *args) { }
-#endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
-#else /* CONFIG_TRANSPARENT_HUGEPAGE */
-static void __init pmd_devmap_tests(struct pgtable_debug_args *args) { }
-static void __init pud_devmap_tests(struct pgtable_debug_args *args) { }
-#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
-#else
-static void __init pte_devmap_tests(struct pgtable_debug_args *args) { }
-static void __init pmd_devmap_tests(struct pgtable_debug_args *args) { }
-static void __init pud_devmap_tests(struct pgtable_debug_args *args) { }
-#endif /* CONFIG_ARCH_HAS_PTE_DEVMAP */
-
static void __init pte_soft_dirty_tests(struct pgtable_debug_args *args)
{
pte_t pte = pfn_pte(args->fixed_pte_pfn, args->page_prot);
@@ -1333,10 +1278,6 @@ static int __init debug_vm_pgtable(void)
pte_protnone_tests(&args);
pmd_protnone_tests(&args);
- pte_devmap_tests(&args);
- pmd_devmap_tests(&args);
- pud_devmap_tests(&args);
-
pte_soft_dirty_tests(&args);
pmd_soft_dirty_tests(&args);
pte_swap_soft_dirty_tests(&args);
--- a/mm/hmm.c~mm-remove-devmap-related-functions-and-page-table-bits
+++ a/mm/hmm.c
@@ -405,8 +405,7 @@ again:
return 0;
}
-#if defined(CONFIG_ARCH_HAS_PTE_DEVMAP) && \
- defined(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD)
+#if defined(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD)
static inline unsigned long pud_to_hmm_pfn_flags(struct hmm_range *range,
pud_t pud)
{
--- a/mm/Kconfig~mm-remove-devmap-related-functions-and-page-table-bits
+++ a/mm/Kconfig
@@ -1117,9 +1117,6 @@ config ARCH_HAS_CURRENT_STACK_POINTER
register alias named "current_stack_pointer", this config can be
selected.
-config ARCH_HAS_PTE_DEVMAP
- bool
-
config ARCH_HAS_ZONE_DMA_SET
bool
@@ -1137,7 +1134,6 @@ config ZONE_DEVICE
depends on MEMORY_HOTPLUG
depends on MEMORY_HOTREMOVE
depends on SPARSEMEM_VMEMMAP
- depends on ARCH_HAS_PTE_DEVMAP
select XARRAY_MULTI
help
--- a/mm/madvise.c~mm-remove-devmap-related-functions-and-page-table-bits
+++ a/mm/madvise.c
@@ -1069,7 +1069,7 @@ static int guard_install_pud_entry(pud_t
pud_t pudval = pudp_get(pud);
/* If huge return >0 so we abort the operation + zap. */
- return pud_trans_huge(pudval) || pud_devmap(pudval);
+ return pud_trans_huge(pudval);
}
static int guard_install_pmd_entry(pmd_t *pmd, unsigned long addr,
@@ -1078,7 +1078,7 @@ static int guard_install_pmd_entry(pmd_t
pmd_t pmdval = pmdp_get(pmd);
/* If huge return >0 so we abort the operation + zap. */
- return pmd_trans_huge(pmdval) || pmd_devmap(pmdval);
+ return pmd_trans_huge(pmdval);
}
static int guard_install_pte_entry(pte_t *pte, unsigned long addr,
@@ -1189,7 +1189,7 @@ static int guard_remove_pud_entry(pud_t
pud_t pudval = pudp_get(pud);
/* If huge, cannot have guard pages present, so no-op - skip. */
- if (pud_trans_huge(pudval) || pud_devmap(pudval))
+ if (pud_trans_huge(pudval))
walk->action = ACTION_CONTINUE;
return 0;
@@ -1201,7 +1201,7 @@ static int guard_remove_pmd_entry(pmd_t
pmd_t pmdval = pmdp_get(pmd);
/* If huge, cannot have guard pages present, so no-op - skip. */
- if (pmd_trans_huge(pmdval) || pmd_devmap(pmdval))
+ if (pmd_trans_huge(pmdval))
walk->action = ACTION_CONTINUE;
return 0;
_
Patches currently in -mm which might be from apopple@nvidia.com are
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2025-07-10 5:45 [merged mm-stable] mm-remove-devmap-related-functions-and-page-table-bits.patch removed from -mm tree Andrew Morton
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