DAX was the only thing that created pmd_devmap and pud_devmap entries
however it no longer does as DAX pages are now refcounted normally and
pXd_trans_huge() returns true for those. Therefore checking both pXd_devmap
and pXd_trans_huge() is redundant and the former can be removed without
changing behaviour as it will always be false.
Signed-off-by: Alistair Popple <apopple@xxxxxxxxxx>
---
fs/dax.c | 5 ++---
include/linux/huge_mm.h | 10 ++++------
include/linux/pgtable.h | 2 +-
mm/hmm.c | 4 ++--
mm/huge_memory.c | 31 +++++++++----------------------
mm/mapping_dirty_helpers.c | 4 ++--
mm/memory.c | 15 ++++++---------
mm/migrate_device.c | 2 +-
mm/mprotect.c | 2 +-
mm/mremap.c | 5 ++---
mm/page_vma_mapped.c | 5 ++---
mm/pagewalk.c | 8 +++-----
mm/pgtable-generic.c | 7 +++----
mm/userfaultfd.c | 4 ++--
mm/vmscan.c | 3 ---
15 files changed, 40 insertions(+), 67 deletions(-)
diff --git a/fs/dax.c b/fs/dax.c
index cf96f3d..e26fb6b 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -1932,7 +1932,7 @@ 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;
}
@@ -2053,8 +2053,7 @@ 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/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 22bc207..f427053 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -370,8 +370,7 @@ 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)
@@ -397,8 +396,7 @@ change_huge_pud(struct mmu_gather *tlb, struct vm_area_struct *vma,
#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)
@@ -421,7 +419,7 @@ 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;
@@ -429,7 +427,7 @@ 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 94d267d..00e4a06 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -1635,7 +1635,7 @@ 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/hmm.c b/mm/hmm.c
index 9e43008..5037f98 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -348,7 +348,7 @@ 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
@@ -359,7 +359,7 @@ 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);
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index a87f7a2..1962b8e 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1400,10 +1400,7 @@ static int insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr,
}
entry = pmd_mkhuge(pfn_t_pmd(pfn, prot));
- if (pfn_t_devmap(pfn))
- entry = pmd_mkdevmap(entry);
- else
- entry = pmd_mkspecial(entry);
+ entry = pmd_mkspecial(entry);
if (write) {
entry = pmd_mkyoung(pmd_mkdirty(entry));
entry = maybe_pmd_mkwrite(entry, vma);
@@ -1443,8 +1440,6 @@ vm_fault_t vmf_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn, bool write)
* but we need to be consistent with PTEs and architectures that
* can't support a 'special' bit.
*/
- BUG_ON(!(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP)) &&
- !pfn_t_devmap(pfn));
BUG_ON((vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP)) ==
(VM_PFNMAP|VM_MIXEDMAP));
BUG_ON((vma->vm_flags & VM_PFNMAP) && is_cow_mapping(vma->vm_flags));
@@ -1537,10 +1532,7 @@ static void insert_pfn_pud(struct vm_area_struct *vma, unsigned long addr,
}
entry = pud_mkhuge(pfn_t_pud(pfn, prot));
- if (pfn_t_devmap(pfn))
- entry = pud_mkdevmap(entry);
- else
- entry = pud_mkspecial(entry);
+ entry = pud_mkspecial(entry);
if (write) {
entry = pud_mkyoung(pud_mkdirty(entry));
entry = maybe_pud_mkwrite(entry, vma);
@@ -1571,8 +1563,6 @@ vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn, bool write)
* but we need to be consistent with PTEs and architectures that
* can't support a 'special' bit.
*/
- BUG_ON(!(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP)) &&
- !pfn_t_devmap(pfn));
BUG_ON((vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP)) ==
(VM_PFNMAP|VM_MIXEDMAP));
BUG_ON((vma->vm_flags & VM_PFNMAP) && is_cow_mapping(vma->vm_flags));
@@ -1799,7 +1789,7 @@ 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;
/*
@@ -2653,8 +2643,7 @@ 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;
@@ -2671,7 +2660,7 @@ 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;
@@ -2723,7 +2712,7 @@ 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);
@@ -2756,7 +2745,7 @@ 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);
@@ -2829,8 +2818,7 @@ 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);
@@ -3047,8 +3035,7 @@ void split_huge_pmd_locked(struct vm_area_struct *vma, unsigned long address,
* require a folio to check the PMD against. Otherwise, there
* is a risk of replacing the wrong folio.
*/
- if (pmd_trans_huge(*pmd) || pmd_devmap(*pmd) ||
- is_pmd_migration_entry(*pmd)) {
+ if (pmd_trans_huge(*pmd) || is_pmd_migration_entry(*pmd)) {
if (folio && folio != pmd_folio(*pmd))
return;
__split_huge_pmd_locked(vma, pmd, address, freeze);
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 a527c70..296ef2c 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -682,8 +682,6 @@ 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))
@@ -1226,8 +1224,7 @@ 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,
@@ -1263,7 +1260,7 @@ 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);
@@ -1788,7 +1785,7 @@ 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)) {
@@ -1830,7 +1827,7 @@ 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);
@@ -6000,7 +5997,7 @@ 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
@@ -6041,7 +6038,7 @@ 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 6771893..49c3984 100644
--- a/mm/migrate_device.c
+++ b/mm/migrate_device.c
@@ -599,7 +599,7 @@ 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 1444878..4aec7b2 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -376,7 +376,7 @@ static inline long change_pmd_range(struct mmu_gather *tlb,
goto next;
_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 cff7f55..e9cfb0b 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -633,7 +633,7 @@ 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);
@@ -655,8 +655,7 @@ 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 32679be..614150d 100644
--- a/mm/page_vma_mapped.c
+++ b/mm/page_vma_mapped.c
@@ -241,8 +241,7 @@ 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)) {
@@ -257,7 +256,7 @@ 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/pagewalk.c b/mm/pagewalk.c
index 0dfb9c2..cca170f 100644
--- a/mm/pagewalk.c
+++ b/mm/pagewalk.c
@@ -143,8 +143,7 @@ static int walk_pmd_range(pud_t *pud, unsigned long addr, unsigned long end,
* We are ONLY installing, so avoid unnecessarily
* splitting a present huge page.
*/
- if (pmd_present(*pmd) &&
- (pmd_trans_huge(*pmd) || pmd_devmap(*pmd)))
+ if (pmd_present(*pmd) && pmd_trans_huge(*pmd))
continue;
}
@@ -210,8 +209,7 @@ static int walk_pud_range(p4d_t *p4d, unsigned long addr, unsigned long end,
* We are ONLY installing, so avoid unnecessarily
* splitting a present huge page.
*/
- if (pud_present(*pud) &&
- (pud_trans_huge(*pud) || pud_devmap(*pud)))
+ if (pud_present(*pud) && pud_trans_huge(*pud))
continue;
}
@@ -872,7 +870,7 @@ struct folio *folio_walk_start(struct folio_walk *fw,
* TODO: FW_MIGRATION support for PUD migration entries
* once there are relevant users.
*/
- if (!pud_present(pud) || pud_devmap(pud) || pud_special(pud)) {
+ if (!pud_present(pud) || pud_special(pud)) {
spin_unlock(ptl);
goto not_found;
} else if (!pud_leaf(pud)) {
diff --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c
index 5a882f2..567e2d0 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 cc6dc18..38e88b1 100644
--- a/mm/userfaultfd.c
+++ b/mm/userfaultfd.c
@@ -794,8 +794,8 @@ static __always_inline ssize_t mfill_atomic(struct userfaultfd_ctx *ctx,
* (This includes the case where the PMD used to be THP and
* changed back to none after __pte_alloc().)
*/
- if (unlikely(!pmd_present(dst_pmdval) || pmd_trans_huge(dst_pmdval) ||
- pmd_devmap(dst_pmdval))) {
+ if (unlikely(!pmd_present(dst_pmdval) ||
+ pmd_trans_huge(dst_pmdval))) {
err = -EEXIST;
break;
}
diff --git a/mm/vmscan.c b/mm/vmscan.c
index b7b4b7f..463d045 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3402,9 +3402,6 @@ 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 (!pmd_young(pmd) && !mm_has_notifiers(vma->vm_mm))
return -1;
--
git-series 0.9.1
