[PATCH 12/13] mm: Remove pXX_devmap callers

Alistair Popple
2024-06-27T00:55:40Z

The devmap PTE special bit was used to detect mappings of FS DAX
pages. This tracking was required to ensure the generic mm did not
manipulate the page reference counts as FS DAX implemented it's own
reference counting scheme.

Now that FS DAX pages have their references counted the same way as
normal pages this tracking is no longer needed and can be
removed.

Almost all existing uses of pmd_devmap() are paired with a check of
pmd_trans_huge(). As pmd_trans_huge() now returns true for FS DAX pages
dropping the check in these cases doesn't change anything.

However care needs to be taken because pmd_trans_huge() also checks that
a page is not an FS DAX page. This is dealt with either by checking
!vma_is_dax() or relying on the fact that the page pointer was obtained
from a page list. This is possible because zone device pages cannot
appear in any page list due to sharing page->lru with page->pgmap.

Signed-off-by: Alistair Popple <apopple@nvidia.com>
---
arch/powerpc/mm/book3s64/hash_pgtable.c | 3 +-
arch/powerpc/mm/book3s64/pgtable.c | 8 +-
arch/powerpc/mm/book3s64/radix_pgtable.c | 5 +-
arch/powerpc/mm/pgtable.c | 2 +-
fs/dax.c | 5 +-
fs/userfaultfd.c | 2 +-
include/linux/huge_mm.h | 10 +-
include/linux/pgtable.h | 2 +-
mm/gup.c | 164 +-----------------------
mm/hmm.c | 7 +-
mm/huge_memory.c | 61 +--------
mm/khugepaged.c | 2 +-
mm/mapping_dirty_helpers.c | 4 +-
mm/memory.c | 37 +----
mm/migrate_device.c | 2 +-
mm/mprotect.c | 2 +-
mm/mremap.c | 5 +-
mm/page_vma_mapped.c | 5 +-
mm/pgtable-generic.c | 7 +-
mm/userfaultfd.c | 2 +-
mm/vmscan.c | 5 +-
21 files changed, 53 insertions(+), 287 deletions(-)

diff --git a/arch/powerpc/mm/book3s64/hash_pgtable.c b/arch/powerpc/mm/book3s64/hash_pgtable.c
index 988948d..82d3117 100644
--- a/arch/powerpc/mm/book3s64/hash_pgtable.c
+++ b/arch/powerpc/mm/book3s64/hash_pgtable.c
@@ -195,7 +195,7 @@ unsigned long hash__pmd_hugepage_update(struct mm_struct *mm, unsigned long addr
unsigned long old;

#ifdef CONFIG_DEBUG_VM
- WARN_ON(!hash__pmd_trans_huge(*pmdp) && !pmd_devmap(*pmdp));
+ WARN_ON(!hash__pmd_trans_huge(*pmdp));
assert_spin_locked(pmd_lockptr(mm, pmdp));
#endif

@@ -227,7 +227,6 @@ pmd_t hash__pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long addres

VM_BUG_ON(address & ~HPAGE_PMD_MASK);
VM_BUG_ON(pmd_trans_huge(*pmdp));
- VM_BUG_ON(pmd_devmap(*pmdp));

pmd = *pmdp;
pmd_clear(pmdp);
diff --git a/arch/powerpc/mm/book3s64/pgtable.c b/arch/powerpc/mm/book3s64/pgtable.c
index 2975ea0..65dd1fe 100644
--- a/arch/powerpc/mm/book3s64/pgtable.c
+++ b/arch/powerpc/mm/book3s64/pgtable.c
@@ -50,7 +50,7 @@ int pmdp_set_access_flags(struct vm_area_struct *vma, unsigned long address,
{
int changed;
#ifdef CONFIG_DEBUG_VM
- WARN_ON(!pmd_trans_huge(*pmdp) && !pmd_devmap(*pmdp));
+ WARN_ON(!pmd_trans_huge(*pmdp));
assert_spin_locked(pmd_lockptr(vma->vm_mm, pmdp));
#endif
changed = !pmd_same(*(pmdp), entry);
@@ -70,7 +70,6 @@ int pudp_set_access_flags(struct vm_area_struct *vma, unsigned long address,
{
int changed;
#ifdef CONFIG_DEBUG_VM
- WARN_ON(!pud_devmap(*pudp));
assert_spin_locked(pud_lockptr(vma->vm_mm, pudp));
#endif
changed = !pud_same(*(pudp), entry);
@@ -182,7 +181,7 @@ pmd_t pmdp_huge_get_and_clear_full(struct vm_area_struct *vma,
pmd_t pmd;
VM_BUG_ON(addr & ~HPAGE_PMD_MASK);
VM_BUG_ON((pmd_present(*pmdp) && !pmd_trans_huge(*pmdp) &&
- !pmd_devmap(*pmdp)) || !pmd_present(*pmdp));
+ || !pmd_present(*pmdp));
pmd = pmdp_huge_get_and_clear(vma->vm_mm, addr, pmdp);
/*
* if it not a fullmm flush, then we can possibly end up converting
@@ -200,8 +199,7 @@ pud_t pudp_huge_get_and_clear_full(struct vm_area_struct *vma,
pud_t pud;

VM_BUG_ON(addr & ~HPAGE_PMD_MASK);
- VM_BUG_ON((pud_present(*pudp) && !pud_devmap(*pudp)) ||
- !pud_present(*pudp));
+ VM_BUG_ON(!pud_present(*pudp));
pud = pudp_huge_get_and_clear(vma->vm_mm, addr, pudp);
/*
* if it not a fullmm flush, then we can possibly end up converting
diff --git a/arch/powerpc/mm/book3s64/radix_pgtable.c b/arch/powerpc/mm/book3s64/radix_pgtable.c
index 15e88f1..1c195bc 100644
--- a/arch/powerpc/mm/book3s64/radix_pgtable.c
+++ b/arch/powerpc/mm/book3s64/radix_pgtable.c
@@ -1348,7 +1348,7 @@ unsigned long radix__pmd_hugepage_update(struct mm_struct *mm, unsigned long add
unsigned long old;

#ifdef CONFIG_DEBUG_VM
- WARN_ON(!radix__pmd_trans_huge(*pmdp) && !pmd_devmap(*pmdp));
+ WARN_ON(!radix__pmd_trans_huge(*pmdp));
assert_spin_locked(pmd_lockptr(mm, pmdp));
#endif

@@ -1365,7 +1365,7 @@ unsigned long radix__pud_hugepage_update(struct mm_struct *mm, unsigned long add
unsigned long old;

#ifdef CONFIG_DEBUG_VM
- WARN_ON(!pud_devmap(*pudp));
+ WARN_ON(!pud_trans_huge(*pudp));
assert_spin_locked(pud_lockptr(mm, pudp));
#endif

@@ -1383,7 +1383,6 @@ pmd_t radix__pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long addre

VM_BUG_ON(address & ~HPAGE_PMD_MASK);
VM_BUG_ON(radix__pmd_trans_huge(*pmdp));
- VM_BUG_ON(pmd_devmap(*pmdp));
/*
* khugepaged calls this for normal pmd
*/
diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c
index 9e7ba9c..11d3b40 100644
--- a/arch/powerpc/mm/pgtable.c
+++ b/arch/powerpc/mm/pgtable.c
@@ -464,7 +464,7 @@ pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
return NULL;
#endif

- if (pmd_trans_huge(pmd) || pmd_devmap(pmd)) {
+ if (pmd_trans_huge(pmd)) {
if (is_thp)
*is_thp = true;
ret_pte = (pte_t *)pmdp;
diff --git a/fs/dax.c b/fs/dax.c
index 862af24..7edd18c 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -1714,7 +1714,7 @@ static vm_fault_t dax_iomap_pte_fault(struct vm_fault *vmf, pfn_t *pfnp,
* the PTE we need to set up. If so just return and the fault will be
* retried.
*/
- if (pmd_trans_huge(*vmf->pmd) || pmd_devmap(*vmf->pmd)) {
+ if (pmd_trans_huge(*vmf->pmd)) {
ret = VM_FAULT_NOPAGE;
goto unlock_entry;
}
@@ -1835,8 +1835,7 @@ static vm_fault_t dax_iomap_pmd_fault(struct vm_fault *vmf, pfn_t *pfnp,
* the PMD we need to set up. If so just return and the fault will be
* retried.
*/
- if (!pmd_none(*vmf->pmd) && !pmd_trans_huge(*vmf->pmd) &&
- !pmd_devmap(*vmf->pmd)) {
+ if (!pmd_none(*vmf->pmd) && !pmd_trans_huge(*vmf->pmd)) {
ret = 0;
goto unlock_entry;
}
diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
index eee7320..094401f 100644
--- a/fs/userfaultfd.c
+++ b/fs/userfaultfd.c
@@ -319,7 +319,7 @@ static inline bool userfaultfd_must_wait(struct userfaultfd_ctx *ctx,
goto out;

ret = false;
- if (!pmd_present(_pmd) || pmd_devmap(_pmd))
+ if (!pmd_present(_pmd) || vma_is_dax(vmf->vma))
goto out;

if (pmd_trans_huge(_pmd)) {
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 0fb6bff..eb3f444 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -322,8 +322,7 @@ void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
#define split_huge_pmd(__vma, __pmd, __address) \
do { \
pmd_t *____pmd = (__pmd); \
- if (is_swap_pmd(*____pmd) || pmd_trans_huge(*____pmd) \
- || pmd_devmap(*____pmd)) \
+ if (is_swap_pmd(*____pmd) || pmd_trans_huge(*____pmd)) \
__split_huge_pmd(__vma, __pmd, __address, \
false, NULL); \
} while (0)
@@ -338,8 +337,7 @@ void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud,
#define split_huge_pud(__vma, __pud, __address) \
do { \
pud_t *____pud = (__pud); \
- if (pud_trans_huge(*____pud) \
- || pud_devmap(*____pud)) \
+ if (pud_trans_huge(*____pud)) \
__split_huge_pud(__vma, __pud, __address); \
} while (0)

@@ -362,7 +360,7 @@ static inline int is_swap_pmd(pmd_t pmd)
static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
struct vm_area_struct *vma)
{
- if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
+ if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd))
return __pmd_trans_huge_lock(pmd, vma);
else
return NULL;
@@ -370,7 +368,7 @@ static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
struct vm_area_struct *vma)
{
- if (pud_trans_huge(*pud) || pud_devmap(*pud))
+ if (pud_trans_huge(*pud))
return __pud_trans_huge_lock(pud, vma);
else
return NULL;
diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index 18019f0..91e06bb 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -1620,7 +1620,7 @@ static inline int pud_trans_unstable(pud_t *pud)
defined(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD)
pud_t pudval = READ_ONCE(*pud);

- if (pud_none(pudval) || pud_trans_huge(pudval) || pud_devmap(pudval))
+ if (pud_none(pudval) || pud_trans_huge(pudval))
return 1;
if (unlikely(pud_bad(pudval))) {
pud_clear_bad(pud);
diff --git a/mm/gup.c b/mm/gup.c
index ce80ff6..88fb92b 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -699,31 +699,9 @@ static struct page *follow_huge_pud(struct vm_area_struct *vma,
return NULL;

pfn += (addr & ~PUD_MASK) >> PAGE_SHIFT;
-
- if (IS_ENABLED(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD) &&
- pud_devmap(pud)) {
- /*
- * device mapped pages can only be returned if the caller
- * will manage the page reference count.
- *
- * At least one of FOLL_GET | FOLL_PIN must be set, so
- * assert that here:
- */
- if (!(flags & (FOLL_GET | FOLL_PIN)))
- return ERR_PTR(-EEXIST);
-
- if (flags & FOLL_TOUCH)
- touch_pud(vma, addr, pudp, flags & FOLL_WRITE);
-
- ctx->pgmap = get_dev_pagemap(pfn, ctx->pgmap);
- if (!ctx->pgmap)
- return ERR_PTR(-EFAULT);
- }
-
page = pfn_to_page(pfn);

- if (!pud_devmap(pud) && !pud_write(pud) &&
- gup_must_unshare(vma, flags, page))
+ if (!pud_write(pud) && gup_must_unshare(vma, flags, page))
return ERR_PTR(-EMLINK);

ret = try_grab_page(page, flags);
@@ -921,8 +899,7 @@ static struct page *follow_page_pte(struct vm_area_struct *vma,
page = vm_normal_page(vma, address, pte);

/*
- * We only care about anon pages in can_follow_write_pte() and don't
- * have to worry about pte_devmap() because they are never anon.
+ * We only care about anon pages in can_follow_write_pte().
*/
if ((flags & FOLL_WRITE) &&
!can_follow_write_pte(pte, page, vma, flags)) {
@@ -930,18 +907,7 @@ static struct page *follow_page_pte(struct vm_area_struct *vma,
goto out;
}

- if (!page && pte_devmap(pte) && (flags & (FOLL_GET | FOLL_PIN))) {
- /*
- * Only return device mapping pages in the FOLL_GET or FOLL_PIN
- * case since they are only valid while holding the pgmap
- * reference.
- */
- *pgmap = get_dev_pagemap(pte_pfn(pte), *pgmap);
- if (*pgmap)
- page = pte_page(pte);
- else
- goto no_page;
- } else if (unlikely(!page)) {
+ if (unlikely(!page)) {
if (flags & FOLL_DUMP) {
/* Avoid special (like zero) pages in core dumps */
page = ERR_PTR(-EFAULT);
@@ -1025,14 +991,6 @@ static struct page *follow_pmd_mask(struct vm_area_struct *vma,
if (unlikely(is_hugepd(__hugepd(pmd_val(pmdval)))))
return follow_hugepd(vma, __hugepd(pmd_val(pmdval)),
address, PMD_SHIFT, flags, ctx);
- if (pmd_devmap(pmdval)) {
- ptl = pmd_lock(mm, pmd);
- page = follow_devmap_pmd(vma, address, pmd, flags, &ctx->pgmap);
- spin_unlock(ptl);
- if (page)
- return page;
- return no_page_table(vma, flags, address);
- }
if (likely(!pmd_leaf(pmdval)))
return follow_page_pte(vma, address, pmd, flags, &ctx->pgmap);

@@ -2920,7 +2878,7 @@ static int gup_fast_pte_range(pmd_t pmd, pmd_t *pmdp, unsigned long addr,
int *nr)
{
struct dev_pagemap *pgmap = NULL;
- int nr_start = *nr, ret = 0;
+ int ret = 0;
pte_t *ptep, *ptem;

ptem = ptep = pte_offset_map(&pmd, addr);
@@ -2944,16 +2902,7 @@ static int gup_fast_pte_range(pmd_t pmd, pmd_t *pmdp, unsigned long addr,
if (!pte_access_permitted(pte, flags & FOLL_WRITE))
goto pte_unmap;

- if (pte_devmap(pte)) {
- if (unlikely(flags & FOLL_LONGTERM))
- goto pte_unmap;
-
- pgmap = get_dev_pagemap(pte_pfn(pte), pgmap);
- if (unlikely(!pgmap)) {
- gup_fast_undo_dev_pagemap(nr, nr_start, flags, pages);
- goto pte_unmap;
- }
- } else if (pte_special(pte))
+ if (pte_special(pte))
goto pte_unmap;

VM_BUG_ON(!pfn_valid(pte_pfn(pte)));
@@ -3024,91 +2973,6 @@ static int gup_fast_pte_range(pmd_t pmd, pmd_t *pmdp, unsigned long addr,
}
#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */

-#if defined(CONFIG_ARCH_HAS_PTE_DEVMAP) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
-static int gup_fast_devmap_leaf(unsigned long pfn, unsigned long addr,
- unsigned long end, unsigned int flags, struct page **pages, int *nr)
-{
- int nr_start = *nr;
- struct dev_pagemap *pgmap = NULL;
-
- do {
- struct folio *folio;
- struct page *page = pfn_to_page(pfn);
-
- pgmap = get_dev_pagemap(pfn, pgmap);
- if (unlikely(!pgmap)) {
- gup_fast_undo_dev_pagemap(nr, nr_start, flags, pages);
- break;
- }
-
- folio = try_grab_folio(page, 1, flags);
- if (!folio) {
- gup_fast_undo_dev_pagemap(nr, nr_start, flags, pages);
- break;
- }
- folio_set_referenced(folio);
- pages[*nr] = page;
- (*nr)++;
- pfn++;
- } while (addr += PAGE_SIZE, addr != end);
-
- put_dev_pagemap(pgmap);
- return addr == end;
-}
-
-static int gup_fast_devmap_pmd_leaf(pmd_t orig, pmd_t *pmdp, unsigned long addr,
- unsigned long end, unsigned int flags, struct page **pages,
- int *nr)
-{
- unsigned long fault_pfn;
- int nr_start = *nr;
-
- fault_pfn = pmd_pfn(orig) + ((addr & ~PMD_MASK) >> PAGE_SHIFT);
- if (!gup_fast_devmap_leaf(fault_pfn, addr, end, flags, pages, nr))
- return 0;
-
- if (unlikely(pmd_val(orig) != pmd_val(*pmdp))) {
- gup_fast_undo_dev_pagemap(nr, nr_start, flags, pages);
- return 0;
- }
- return 1;
-}
-
-static int gup_fast_devmap_pud_leaf(pud_t orig, pud_t *pudp, unsigned long addr,
- unsigned long end, unsigned int flags, struct page **pages,
- int *nr)
-{
- unsigned long fault_pfn;
- int nr_start = *nr;
-
- fault_pfn = pud_pfn(orig) + ((addr & ~PUD_MASK) >> PAGE_SHIFT);
- if (!gup_fast_devmap_leaf(fault_pfn, addr, end, flags, pages, nr))
- return 0;
-
- if (unlikely(pud_val(orig) != pud_val(*pudp))) {
- gup_fast_undo_dev_pagemap(nr, nr_start, flags, pages);
- return 0;
- }
- return 1;
-}
-#else
-static int gup_fast_devmap_pmd_leaf(pmd_t orig, pmd_t *pmdp, unsigned long addr,
- unsigned long end, unsigned int flags, struct page **pages,
- int *nr)
-{
- BUILD_BUG();
- return 0;
-}
-
-static int gup_fast_devmap_pud_leaf(pud_t pud, pud_t *pudp, unsigned long addr,
- unsigned long end, unsigned int flags, struct page **pages,
- int *nr)
-{
- BUILD_BUG();
- return 0;
-}
-#endif
-
static int gup_fast_pmd_leaf(pmd_t orig, pmd_t *pmdp, unsigned long addr,
unsigned long end, unsigned int flags, struct page **pages,
int *nr)
@@ -3120,13 +2984,7 @@ static int gup_fast_pmd_leaf(pmd_t orig, pmd_t *pmdp, unsigned long addr,
if (!pmd_access_permitted(orig, flags & FOLL_WRITE))
return 0;

- if (pmd_devmap(orig)) {
- if (unlikely(flags & FOLL_LONGTERM))
- return 0;
- return gup_fast_devmap_pmd_leaf(orig, pmdp, addr, end, flags,
- pages, nr);
- }
-
+ // TODO: As a side-effect does this allow long-term pinning of DAX pages?
page = pmd_page(orig);
refs = record_subpages(page, PMD_SIZE, addr, end, pages + *nr);

@@ -3164,13 +3022,7 @@ static int gup_fast_pud_leaf(pud_t orig, pud_t *pudp, unsigned long addr,
if (!pud_access_permitted(orig, flags & FOLL_WRITE))
return 0;

- if (pud_devmap(orig)) {
- if (unlikely(flags & FOLL_LONGTERM))
- return 0;
- return gup_fast_devmap_pud_leaf(orig, pudp, addr, end, flags,
- pages, nr);
- }
-
+ // TODO: FOLL_LONGTERM?
page = pud_page(orig);
refs = record_subpages(page, PUD_SIZE, addr, end, pages + *nr);

@@ -3209,8 +3061,6 @@ static int gup_fast_pgd_leaf(pgd_t orig, pgd_t *pgdp, unsigned long addr,
if (!pgd_access_permitted(orig, flags & FOLL_WRITE))
return 0;

- BUILD_BUG_ON(pgd_devmap(orig));
-
page = pgd_page(orig);
refs = record_subpages(page, PGDIR_SIZE, addr, end, pages + *nr);

diff --git a/mm/hmm.c b/mm/hmm.c
index 26e1905..7f78b0b 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -298,7 +298,6 @@ static int hmm_vma_handle_pte(struct mm_walk *walk, unsigned long addr,
* fall through and treat it like a normal page.
*/
if (!vm_normal_page(walk->vma, addr, pte) &&
- !pte_devmap(pte) &&
!is_zero_pfn(pte_pfn(pte))) {
if (hmm_pte_need_fault(hmm_vma_walk, pfn_req_flags, 0)) {
pte_unmap(ptep);
@@ -351,7 +350,7 @@ static int hmm_vma_walk_pmd(pmd_t *pmdp,
return hmm_pfns_fill(start, end, range, HMM_PFN_ERROR);
}

- if (pmd_devmap(pmd) || pmd_trans_huge(pmd)) {
+ if (pmd_trans_huge(pmd)) {
/*
* No need to take pmd_lock here, even if some other thread
* is splitting the huge pmd we will get that event through
@@ -362,7 +361,7 @@ static int hmm_vma_walk_pmd(pmd_t *pmdp,
* values.
*/
pmd = pmdp_get_lockless(pmdp);
- if (!pmd_devmap(pmd) && !pmd_trans_huge(pmd))
+ if (!pmd_trans_huge(pmd))
goto again;

return hmm_vma_handle_pmd(walk, addr, end, hmm_pfns, pmd);
@@ -429,7 +428,7 @@ static int hmm_vma_walk_pud(pud_t *pudp, unsigned long start, unsigned long end,
return hmm_vma_walk_hole(start, end, -1, walk);
}

- if (pud_leaf(pud) && pud_devmap(pud)) {
+ if (pud_leaf(pud) && vma_is_dax(walk->vma)) {
unsigned long i, npages, pfn;
unsigned int required_fault;
unsigned long *hmm_pfns;
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index de39af4..2e164c3 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1151,8 +1151,6 @@ vm_fault_t dax_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn, bool write)
}

entry = pmd_mkhuge(pfn_t_pmd(pfn, vma->vm_page_prot));
- if (pfn_t_devmap(pfn))
- entry = pmd_mkdevmap(entry);
if (write) {
entry = pmd_mkyoung(pmd_mkdirty(entry));
entry = maybe_pmd_mkwrite(entry, vma);
@@ -1230,8 +1228,6 @@ vm_fault_t dax_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn, bool write)
}

entry = pud_mkhuge(pfn_t_pud(pfn, prot));
- if (pfn_t_devmap(pfn))
- entry = pud_mkdevmap(entry);
if (write) {
entry = pud_mkyoung(pud_mkdirty(entry));
entry = maybe_pud_mkwrite(entry, vma);
@@ -1267,46 +1263,6 @@ void touch_pmd(struct vm_area_struct *vma, unsigned long addr,
update_mmu_cache_pmd(vma, addr, pmd);
}

-struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
- pmd_t *pmd, int flags, struct dev_pagemap **pgmap)
-{
- unsigned long pfn = pmd_pfn(*pmd);
- struct mm_struct *mm = vma->vm_mm;
- struct page *page;
- int ret;
-
- assert_spin_locked(pmd_lockptr(mm, pmd));
-
- if (flags & FOLL_WRITE && !pmd_write(*pmd))
- return NULL;
-
- if (pmd_present(*pmd) && pmd_devmap(*pmd))
- /* pass */;
- else
- return NULL;
-
- if (flags & FOLL_TOUCH)
- touch_pmd(vma, addr, pmd, flags & FOLL_WRITE);
-
- /*
- * device mapped pages can only be returned if the
- * caller will manage the page reference count.
- */
- if (!(flags & (FOLL_GET | FOLL_PIN)))
- return ERR_PTR(-EEXIST);
-
- pfn += (addr & ~PMD_MASK) >> PAGE_SHIFT;
- *pgmap = get_dev_pagemap(pfn, *pgmap);
- if (!*pgmap)
- return ERR_PTR(-EFAULT);
- page = pfn_to_page(pfn);
- ret = try_grab_page(page, flags);
- if (ret)
- page = ERR_PTR(ret);
-
- return page;
-}
-
int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr,
struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma)
@@ -1438,7 +1394,7 @@ int copy_huge_pud(struct mm_struct *dst_mm, struct mm_struct *src_mm,

ret = -EAGAIN;
pud = *src_pud;
- if (unlikely(!pud_trans_huge(pud) && !pud_devmap(pud)))
+ if (unlikely(!pud_trans_huge(pud)))
goto out_unlock;

/*
@@ -2210,8 +2166,7 @@ spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma)
{
spinlock_t *ptl;
ptl = pmd_lock(vma->vm_mm, pmd);
- if (likely(is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) ||
- pmd_devmap(*pmd)))
+ if (likely(is_swap_pmd(*pmd) || pmd_trans_huge(*pmd)))
return ptl;
spin_unlock(ptl);
return NULL;
@@ -2228,7 +2183,7 @@ spinlock_t *__pud_trans_huge_lock(pud_t *pud, struct vm_area_struct *vma)
spinlock_t *ptl;

ptl = pud_lock(vma->vm_mm, pud);
- if (likely(pud_trans_huge(*pud) || pud_devmap(*pud)))
+ if (likely(pud_trans_huge(*pud)))
return ptl;
spin_unlock(ptl);
return NULL;
@@ -2278,7 +2233,7 @@ static void __split_huge_pud_locked(struct vm_area_struct *vma, pud_t *pud,
VM_BUG_ON(haddr & ~HPAGE_PUD_MASK);
VM_BUG_ON_VMA(vma->vm_start > haddr, vma);
VM_BUG_ON_VMA(vma->vm_end < haddr + HPAGE_PUD_SIZE, vma);
- VM_BUG_ON(!pud_trans_huge(*pud) && !pud_devmap(*pud));
+ VM_BUG_ON(!pud_trans_huge(*pud));

count_vm_event(THP_SPLIT_PUD);

@@ -2311,7 +2266,7 @@ void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud,
(address & HPAGE_PUD_MASK) + HPAGE_PUD_SIZE);
mmu_notifier_invalidate_range_start(&range);
ptl = pud_lock(vma->vm_mm, pud);
- if (unlikely(!pud_trans_huge(*pud) && !pud_devmap(*pud)))
+ if (unlikely(!pud_trans_huge(*pud)))
goto out;
__split_huge_pud_locked(vma, pud, range.start);

@@ -2379,8 +2334,7 @@ static void __split_huge_pmd_locked(struct vm_area_struct *vma, pmd_t *pmd,
VM_BUG_ON(haddr & ~HPAGE_PMD_MASK);
VM_BUG_ON_VMA(vma->vm_start > haddr, vma);
VM_BUG_ON_VMA(vma->vm_end < haddr + HPAGE_PMD_SIZE, vma);
- VM_BUG_ON(!is_pmd_migration_entry(*pmd) && !pmd_trans_huge(*pmd)
- && !pmd_devmap(*pmd));
+ VM_BUG_ON(!is_pmd_migration_entry(*pmd) && !pmd_trans_huge(*pmd));

count_vm_event(THP_SPLIT_PMD);

@@ -2603,8 +2557,7 @@ void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
VM_BUG_ON(freeze && !folio);
VM_WARN_ON_ONCE(folio && !folio_test_locked(folio));

- if (pmd_trans_huge(*pmd) || pmd_devmap(*pmd) ||
- is_pmd_migration_entry(*pmd)) {
+ if (pmd_trans_huge(*pmd) || is_pmd_migration_entry(*pmd)) {
/*
* It's safe to call pmd_page when folio is set because it's
* guaranteed that pmd is present.
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 774a97e..d4996ca 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -942,8 +942,6 @@ static int find_pmd_or_thp_or_none(struct mm_struct *mm,
return SCAN_PMD_NULL;
if (pmd_trans_huge(pmde))
return SCAN_PMD_MAPPED;
- if (pmd_devmap(pmde))
- return SCAN_PMD_NULL;
if (pmd_bad(pmde))
return SCAN_PMD_NULL;
return SCAN_SUCCEED;
diff --git a/mm/mapping_dirty_helpers.c b/mm/mapping_dirty_helpers.c
index 2f8829b..208b428 100644
--- a/mm/mapping_dirty_helpers.c
+++ b/mm/mapping_dirty_helpers.c
@@ -129,7 +129,7 @@ static int wp_clean_pmd_entry(pmd_t *pmd, unsigned long addr, unsigned long end,
pmd_t pmdval = pmdp_get_lockless(pmd);

/* Do not split a huge pmd, present or migrated */
- if (pmd_trans_huge(pmdval) || pmd_devmap(pmdval)) {
+ if (pmd_trans_huge(pmdval)) {
WARN_ON(pmd_write(pmdval) || pmd_dirty(pmdval));
walk->action = ACTION_CONTINUE;
}
@@ -152,7 +152,7 @@ static int wp_clean_pud_entry(pud_t *pud, unsigned long addr, unsigned long end,
pud_t pudval = READ_ONCE(*pud);

/* Do not split a huge pud */
- if (pud_trans_huge(pudval) || pud_devmap(pudval)) {
+ if (pud_trans_huge(pudval)) {
WARN_ON(pud_write(pudval) || pud_dirty(pudval));
walk->action = ACTION_CONTINUE;
}
diff --git a/mm/memory.c b/mm/memory.c
index 4f26a1f..bd80198 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -595,16 +595,6 @@ struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
return NULL;
if (is_zero_pfn(pfn))
return NULL;
- if (pte_devmap(pte))
- /*
- * NOTE: New users of ZONE_DEVICE will not set pte_devmap()
- * and will have refcounts incremented on their struct pages
- * when they are inserted into PTEs, thus they are safe to
- * return here. Legacy ZONE_DEVICE pages that set pte_devmap()
- * do not have refcounts. Example of legacy ZONE_DEVICE is
- * MEMORY_DEVICE_FS_DAX type in pmem or virtio_fs drivers.
- */
- return NULL;

print_bad_pte(vma, addr, pte, NULL);
return NULL;
@@ -680,8 +670,6 @@ struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr,
}
}

- if (pmd_devmap(pmd))
- return NULL;
if (is_huge_zero_pmd(pmd))
return NULL;
if (unlikely(pfn > highest_memmap_pfn))
@@ -1223,8 +1211,7 @@ copy_pmd_range(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma,
src_pmd = pmd_offset(src_pud, addr);
do {
next = pmd_addr_end(addr, end);
- if (is_swap_pmd(*src_pmd) || pmd_trans_huge(*src_pmd)
- || pmd_devmap(*src_pmd)) {
+ if (is_swap_pmd(*src_pmd) || pmd_trans_huge(*src_pmd)) {
int err;
VM_BUG_ON_VMA(next-addr != HPAGE_PMD_SIZE, src_vma);
err = copy_huge_pmd(dst_mm, src_mm, dst_pmd, src_pmd,
@@ -1260,7 +1247,7 @@ copy_pud_range(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma,
src_pud = pud_offset(src_p4d, addr);
do {
next = pud_addr_end(addr, end);
- if (pud_trans_huge(*src_pud) || pud_devmap(*src_pud)) {
+ if (pud_trans_huge(*src_pud)) {
int err;

VM_BUG_ON_VMA(next-addr != HPAGE_PUD_SIZE, src_vma);
@@ -1698,7 +1685,7 @@ static inline unsigned long zap_pmd_range(struct mmu_gather *tlb,
pmd = pmd_offset(pud, addr);
do {
next = pmd_addr_end(addr, end);
- if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) || pmd_devmap(*pmd)) {
+ if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd)) {
if (next - addr != HPAGE_PMD_SIZE)
__split_huge_pmd(vma, pmd, addr, false, NULL);
else if (zap_huge_pmd(tlb, vma, pmd, addr)) {
@@ -1740,7 +1727,7 @@ static inline unsigned long zap_pud_range(struct mmu_gather *tlb,
pud = pud_offset(p4d, addr);
do {
next = pud_addr_end(addr, end);
- if (pud_trans_huge(*pud) || pud_devmap(*pud)) {
+ if (pud_trans_huge(*pud)) {
if (next - addr != HPAGE_PUD_SIZE) {
mmap_assert_locked(tlb->mm);
split_huge_pud(vma, pud, addr);
@@ -2326,10 +2313,7 @@ static vm_fault_t insert_pfn(struct vm_area_struct *vma, unsigned long addr,
}

/* Ok, finally just insert the thing.. */
- if (pfn_t_devmap(pfn))
- entry = pte_mkdevmap(pfn_t_pte(pfn, prot));
- else
- entry = pte_mkspecial(pfn_t_pte(pfn, prot));
+ entry = pte_mkspecial(pfn_t_pte(pfn, prot));

if (mkwrite) {
entry = pte_mkyoung(entry);
@@ -2437,8 +2421,6 @@ static bool vm_mixed_ok(struct vm_area_struct *vma, pfn_t pfn)
/* these checks mirror the abort conditions in vm_normal_page */
if (vma->vm_flags & VM_MIXEDMAP)
return true;
- if (pfn_t_devmap(pfn))
- return true;
if (pfn_t_special(pfn))
return true;
if (is_zero_pfn(pfn_t_to_pfn(pfn)))
@@ -2469,8 +2451,7 @@ static vm_fault_t __vm_insert_mixed(struct vm_area_struct *vma,
* than insert_pfn). If a zero_pfn were inserted into a VM_MIXEDMAP
* without pte special, it would there be refcounted as a normal page.
*/
- if (!IS_ENABLED(CONFIG_ARCH_HAS_PTE_SPECIAL) &&
- !pfn_t_devmap(pfn) && pfn_t_valid(pfn)) {
+ if (!IS_ENABLED(CONFIG_ARCH_HAS_PTE_SPECIAL) && pfn_t_valid(pfn)) {
struct page *page;

/*
@@ -2514,8 +2495,6 @@ vm_fault_t dax_insert_pfn(struct vm_area_struct *vma,
if (!pfn_t_valid(pfn_t))
return VM_FAULT_SIGBUS;

- WARN_ON_ONCE(pfn_t_devmap(pfn_t));
-
if (WARN_ON(is_zero_pfn(pfn) && write))
return VM_FAULT_SIGBUS;

@@ -5528,7 +5507,7 @@ static vm_fault_t __handle_mm_fault(struct vm_area_struct *vma,
pud_t orig_pud = *vmf.pud;

barrier();
- if (pud_trans_huge(orig_pud) || pud_devmap(orig_pud)) {
+ if (pud_trans_huge(orig_pud)) {

/*
* TODO once we support anonymous PUDs: NUMA case and
@@ -5569,7 +5548,7 @@ static vm_fault_t __handle_mm_fault(struct vm_area_struct *vma,
pmd_migration_entry_wait(mm, vmf.pmd);
return 0;
}
- if (pmd_trans_huge(vmf.orig_pmd) || pmd_devmap(vmf.orig_pmd)) {
+ if (pmd_trans_huge(vmf.orig_pmd)) {
if (pmd_protnone(vmf.orig_pmd) && vma_is_accessible(vma))
return do_huge_pmd_numa_page(&vmf);

diff --git a/mm/migrate_device.c b/mm/migrate_device.c
index 4fdd8fa..4277516 100644
--- a/mm/migrate_device.c
+++ b/mm/migrate_device.c
@@ -596,7 +596,7 @@ static void migrate_vma_insert_page(struct migrate_vma *migrate,
pmdp = pmd_alloc(mm, pudp, addr);
if (!pmdp)
goto abort;
- if (pmd_trans_huge(*pmdp) || pmd_devmap(*pmdp))
+ if (pmd_trans_huge(*pmdp))
goto abort;
if (pte_alloc(mm, pmdp))
goto abort;
diff --git a/mm/mprotect.c b/mm/mprotect.c
index 8c6cd88..c717c74 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -391,7 +391,7 @@ static inline long change_pmd_range(struct mmu_gather *tlb,
}

_pmd = pmdp_get_lockless(pmd);
- if (is_swap_pmd(_pmd) || pmd_trans_huge(_pmd) || pmd_devmap(_pmd)) {
+ if (is_swap_pmd(_pmd) || pmd_trans_huge(_pmd)) {
if ((next - addr != HPAGE_PMD_SIZE) ||
pgtable_split_needed(vma, cp_flags)) {
__split_huge_pmd(vma, pmd, addr, false, NULL);
diff --git a/mm/mremap.c b/mm/mremap.c
index 5f96bc5..57bb0b9 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -587,7 +587,7 @@ unsigned long move_page_tables(struct vm_area_struct *vma,
new_pud = alloc_new_pud(vma->vm_mm, vma, new_addr);
if (!new_pud)
break;
- if (pud_trans_huge(*old_pud) || pud_devmap(*old_pud)) {
+ if (pud_trans_huge(*old_pud)) {
if (extent == HPAGE_PUD_SIZE) {
move_pgt_entry(HPAGE_PUD, vma, old_addr, new_addr,
old_pud, new_pud, need_rmap_locks);
@@ -609,8 +609,7 @@ unsigned long move_page_tables(struct vm_area_struct *vma,
if (!new_pmd)
break;
again:
- if (is_swap_pmd(*old_pmd) || pmd_trans_huge(*old_pmd) ||
- pmd_devmap(*old_pmd)) {
+ if (is_swap_pmd(*old_pmd) || pmd_trans_huge(*old_pmd)) {
if (extent == HPAGE_PMD_SIZE &&
move_pgt_entry(HPAGE_PMD, vma, old_addr, new_addr,
old_pmd, new_pmd, need_rmap_locks))
diff --git a/mm/page_vma_mapped.c b/mm/page_vma_mapped.c
index ae5cc42..77da636 100644
--- a/mm/page_vma_mapped.c
+++ b/mm/page_vma_mapped.c
@@ -235,8 +235,7 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw)
*/
pmde = pmdp_get_lockless(pvmw->pmd);

- if (pmd_trans_huge(pmde) || is_pmd_migration_entry(pmde) ||
- (pmd_present(pmde) && pmd_devmap(pmde))) {
+ if (pmd_trans_huge(pmde) || is_pmd_migration_entry(pmde)) {
pvmw->ptl = pmd_lock(mm, pvmw->pmd);
pmde = *pvmw->pmd;
if (!pmd_present(pmde)) {
@@ -251,7 +250,7 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw)
return not_found(pvmw);
return true;
}
- if (likely(pmd_trans_huge(pmde) || pmd_devmap(pmde))) {
+ if (likely(pmd_trans_huge(pmde))) {
if (pvmw->flags & PVMW_MIGRATION)
return not_found(pvmw);
if (!check_pmd(pmd_pfn(pmde), pvmw))
diff --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c
index a78a4ad..093c435 100644
--- a/mm/pgtable-generic.c
+++ b/mm/pgtable-generic.c
@@ -139,8 +139,7 @@ pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma, unsigned long address,
{
pmd_t pmd;
VM_BUG_ON(address & ~HPAGE_PMD_MASK);
- VM_BUG_ON(pmd_present(*pmdp) && !pmd_trans_huge(*pmdp) &&
- !pmd_devmap(*pmdp));
+ VM_BUG_ON(pmd_present(*pmdp) && !pmd_trans_huge(*pmdp));
pmd = pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp);
flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
return pmd;
@@ -153,7 +152,7 @@ pud_t pudp_huge_clear_flush(struct vm_area_struct *vma, unsigned long address,
pud_t pud;

VM_BUG_ON(address & ~HPAGE_PUD_MASK);
- VM_BUG_ON(!pud_trans_huge(*pudp) && !pud_devmap(*pudp));
+ VM_BUG_ON(!pud_trans_huge(*pudp));
pud = pudp_huge_get_and_clear(vma->vm_mm, address, pudp);
flush_pud_tlb_range(vma, address, address + HPAGE_PUD_SIZE);
return pud;
@@ -293,7 +292,7 @@ pte_t *__pte_offset_map(pmd_t *pmd, unsigned long addr, pmd_t *pmdvalp)
*pmdvalp = pmdval;
if (unlikely(pmd_none(pmdval) || is_pmd_migration_entry(pmdval)))
goto nomap;
- if (unlikely(pmd_trans_huge(pmdval) || pmd_devmap(pmdval)))
+ if (unlikely(pmd_trans_huge(pmdval)))
goto nomap;
if (unlikely(pmd_bad(pmdval))) {
pmd_clear_bad(pmd);
diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c
index defa510..dfd95e0 100644
--- a/mm/userfaultfd.c
+++ b/mm/userfaultfd.c
@@ -1685,7 +1685,7 @@ ssize_t move_pages(struct userfaultfd_ctx *ctx, unsigned long dst_start,

ptl = pmd_trans_huge_lock(src_pmd, src_vma);
if (ptl) {
- if (pmd_devmap(*src_pmd)) {
+ if (vma_is_dax(src_vma)) {
spin_unlock(ptl);
err = -ENOENT;
break;
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 2e34de9..e8badb4 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3285,7 +3285,7 @@ static unsigned long get_pte_pfn(pte_t pte, struct vm_area_struct *vma, unsigned
if (!pte_present(pte) || is_zero_pfn(pfn))
return -1;

- if (WARN_ON_ONCE(pte_devmap(pte) || pte_special(pte)))
+ if (WARN_ON_ONCE(pte_special(pte)))
return -1;

if (WARN_ON_ONCE(!pfn_valid(pfn)))
@@ -3303,9 +3303,6 @@ static unsigned long get_pmd_pfn(pmd_t pmd, struct vm_area_struct *vma, unsigned
if (!pmd_present(pmd) || is_huge_zero_pmd(pmd))
return -1;

- if (WARN_ON_ONCE(pmd_devmap(pmd)))
- return -1;
-
if (WARN_ON_ONCE(!pfn_valid(pfn)))
return -1;

--
git-series 0.9.1