[PATCH 11/13] huge_memory: Remove dead vmf_insert_pXd code

[Alistair Popple]

Now that DAX is managing page reference counts the same as normal
pages there are no callers for vmf_insert_pXd functions so remove
them.

Signed-off-by: Alistair Popple <apopple at nvidia.com>
---
 include/linux/huge_mm.h |   2 +-
 mm/huge_memory.c        | 165 +-----------------------------------------
 2 files changed, 167 deletions(-)

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 9207d8e..0fb6bff 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -37,8 +37,6 @@ int change_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
 		    pmd_t *pmd, unsigned long addr, pgprot_t newprot,
 		    unsigned long cp_flags);
 
-vm_fault_t vmf_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn, bool write);
-vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn, bool write);
 vm_fault_t dax_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn, bool write);
 vm_fault_t dax_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn, bool write);
 
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 5191f91..de39af4 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1111,97 +1111,6 @@ vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf)
 	return __do_huge_pmd_anonymous_page(vmf, &folio->page, gfp);
 }
 
-static void insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr,
-		pmd_t *pmd, pfn_t pfn, pgprot_t prot, bool write,
-		pgtable_t pgtable)
-{
-	struct mm_struct *mm = vma->vm_mm;
-	pmd_t entry;
-	spinlock_t *ptl;
-
-	ptl = pmd_lock(mm, pmd);
-	if (!pmd_none(*pmd)) {
-		if (write) {
-			if (pmd_pfn(*pmd) != pfn_t_to_pfn(pfn)) {
-				WARN_ON_ONCE(!is_huge_zero_pmd(*pmd));
-				goto out_unlock;
-			}
-			entry = pmd_mkyoung(*pmd);
-			entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma);
-			if (pmdp_set_access_flags(vma, addr, pmd, entry, 1))
-				update_mmu_cache_pmd(vma, addr, pmd);
-		}
-
-		goto out_unlock;
-	}
-
-	entry = pmd_mkhuge(pfn_t_pmd(pfn, prot));
-	if (pfn_t_devmap(pfn))
-		entry = pmd_mkdevmap(entry);
-	if (write) {
-		entry = pmd_mkyoung(pmd_mkdirty(entry));
-		entry = maybe_pmd_mkwrite(entry, vma);
-	}
-
-	if (pgtable) {
-		pgtable_trans_huge_deposit(mm, pmd, pgtable);
-		mm_inc_nr_ptes(mm);
-		pgtable = NULL;
-	}
-
-	set_pmd_at(mm, addr, pmd, entry);
-	update_mmu_cache_pmd(vma, addr, pmd);
-
-out_unlock:
-	spin_unlock(ptl);
-	if (pgtable)
-		pte_free(mm, pgtable);
-}
-
-/**
- * vmf_insert_pfn_pmd - insert a pmd size pfn
- * @vmf: Structure describing the fault
- * @pfn: pfn to insert
- * @write: whether it's a write fault
- *
- * Insert a pmd size pfn. See vmf_insert_pfn() for additional info.
- *
- * Return: vm_fault_t value.
- */
-vm_fault_t vmf_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn, bool write)
-{
-	unsigned long addr = vmf->address & PMD_MASK;
-	struct vm_area_struct *vma = vmf->vma;
-	pgprot_t pgprot = vma->vm_page_prot;
-	pgtable_t pgtable = NULL;
-
-	/*
-	 * If we had pmd_special, we could avoid all these restrictions,
-	 * 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));
-
-	if (addr < vma->vm_start || addr >= vma->vm_end)
-		return VM_FAULT_SIGBUS;
-
-	if (arch_needs_pgtable_deposit()) {
-		pgtable = pte_alloc_one(vma->vm_mm);
-		if (!pgtable)
-			return VM_FAULT_OOM;
-	}
-
-	track_pfn_insert(vma, &pgprot, pfn);
-
-	insert_pfn_pmd(vma, addr, vmf->pmd, pfn, pgprot, write, pgtable);
-	return VM_FAULT_NOPAGE;
-}
-EXPORT_SYMBOL_GPL(vmf_insert_pfn_pmd);
-
 vm_fault_t dax_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn, bool write)
 {
 	struct vm_area_struct *vma = vmf->vma;
@@ -1280,80 +1189,6 @@ static pud_t maybe_pud_mkwrite(pud_t pud, struct vm_area_struct *vma)
 	return pud;
 }
 
-static void insert_pfn_pud(struct vm_area_struct *vma, unsigned long addr,
-		pud_t *pud, pfn_t pfn, bool write)
-{
-	struct mm_struct *mm = vma->vm_mm;
-	pgprot_t prot = vma->vm_page_prot;
-	pud_t entry;
-	spinlock_t *ptl;
-
-	ptl = pud_lock(mm, pud);
-	if (!pud_none(*pud)) {
-		if (write) {
-			if (pud_pfn(*pud) != pfn_t_to_pfn(pfn)) {
-				WARN_ON_ONCE(!is_huge_zero_pud(*pud));
-				goto out_unlock;
-			}
-			entry = pud_mkyoung(*pud);
-			entry = maybe_pud_mkwrite(pud_mkdirty(entry), vma);
-			if (pudp_set_access_flags(vma, addr, pud, entry, 1))
-				update_mmu_cache_pud(vma, addr, pud);
-		}
-		goto out_unlock;
-	}
-
-	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);
-	}
-	set_pud_at(mm, addr, pud, entry);
-	update_mmu_cache_pud(vma, addr, pud);
-
-out_unlock:
-	spin_unlock(ptl);
-}
-
-/**
- * vmf_insert_pfn_pud - insert a pud size pfn
- * @vmf: Structure describing the fault
- * @pfn: pfn to insert
- * @write: whether it's a write fault
- *
- * Insert a pud size pfn. See vmf_insert_pfn() for additional info.
- *
- * Return: vm_fault_t value.
- */
-vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn, bool write)
-{
-	unsigned long addr = vmf->address & PUD_MASK;
-	struct vm_area_struct *vma = vmf->vma;
-	pgprot_t pgprot = vma->vm_page_prot;
-
-	/*
-	 * If we had pud_special, we could avoid all these restrictions,
-	 * 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));
-
-	if (addr < vma->vm_start || addr >= vma->vm_end)
-		return VM_FAULT_SIGBUS;
-
-	track_pfn_insert(vma, &pgprot, pfn);
-
-	insert_pfn_pud(vma, addr, vmf->pud, pfn, write);
-	return VM_FAULT_NOPAGE;
-}
-EXPORT_SYMBOL_GPL(vmf_insert_pfn_pud);
-
 /**
  * dax_insert_pfn_pud - insert a pud size pfn backed by a normal page
  * @vmf: Structure describing the fault
-- 
git-series 0.9.1