Remove follow_pfn now that the last user is gone.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
include/linux/mm.h | 2 --
mm/memory.c | 36 ++----------------------------------
mm/nommu.c | 21 ---------------------
3 files changed, 2 insertions(+), 57 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 0436b919f1c7fc..9cd2c69f913601 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2393,8 +2393,6 @@ int
copy_page_range(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma);
int follow_pte(struct mm_struct *mm, unsigned long address,
pte_t **ptepp, spinlock_t **ptlp);
-int follow_pfn(struct vm_area_struct *vma, unsigned long address,
- unsigned long *pfn);
int follow_phys(struct vm_area_struct *vma, unsigned long address,
unsigned int flags, unsigned long *prot, resource_size_t *phys);
int generic_access_phys(struct vm_area_struct *vma, unsigned long addr,
diff --git a/mm/memory.c b/mm/memory.c
index f2bc6dd15eb830..d7f09d5aae6e53 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -5880,8 +5880,8 @@ int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
* Only IO mappings and raw PFN mappings are allowed. The mmap semaphore
* should be taken for read.
*
- * KVM uses this function. While it is arguably less bad than ``follow_pfn``,
- * it is not a good general-purpose API.
+ * KVM uses this function. While it is arguably less bad than the historic
+ * ``follow_pfn``, it is not a good general-purpose API.
*
* Return: zero on success, -ve otherwise.
*/
@@ -5923,38 +5923,6 @@ int follow_pte(struct mm_struct *mm, unsigned long address,
}
EXPORT_SYMBOL_GPL(follow_pte);
-/**
- * follow_pfn - look up PFN at a user virtual address
- * @vma: memory mapping
- * @address: user virtual address
- * @pfn: location to store found PFN
- *
- * Only IO mappings and raw PFN mappings are allowed.
- *
- * This function does not allow the caller to read the permissions
- * of the PTE. Do not use it.
- *
- * Return: zero and the pfn at @pfn on success, -ve otherwise.
- */
-int follow_pfn(struct vm_area_struct *vma, unsigned long address,
- unsigned long *pfn)
-{
- int ret = -EINVAL;
- spinlock_t *ptl;
- pte_t *ptep;
-
- if (!(vma->vm_flags & (VM_IO | VM_PFNMAP)))
- return ret;
-
- ret = follow_pte(vma->vm_mm, address, &ptep, &ptl);
- if (ret)
- return ret;
- *pfn = pte_pfn(ptep_get(ptep));
- pte_unmap_unlock(ptep, ptl);
- return 0;
-}
-EXPORT_SYMBOL(follow_pfn);
-
#ifdef CONFIG_HAVE_IOREMAP_PROT
int follow_phys(struct vm_area_struct *vma,
unsigned long address, unsigned int flags,
diff --git a/mm/nommu.c b/mm/nommu.c
index 5ec8f44e7ce976..38d3ecc30c3ba9 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -110,27 +110,6 @@ unsigned int kobjsize(const void *objp)
return page_size(page);
}
-/**
- * follow_pfn - look up PFN at a user virtual address
- * @vma: memory mapping
- * @address: user virtual address
- * @pfn: location to store found PFN
- *
- * Only IO mappings and raw PFN mappings are allowed.
- *
- * Returns zero and the pfn at @pfn on success, -ve otherwise.
- */
-int follow_pfn(struct vm_area_struct *vma, unsigned long address,
- unsigned long *pfn)
-{
- if (!(vma->vm_flags & (VM_IO | VM_PFNMAP)))
- return -EINVAL;
-
- *pfn = address >> PAGE_SHIFT;
- return 0;
-}
-EXPORT_SYMBOL(follow_pfn);
-
void vfree(const void *addr)
{
kfree(addr);
--
2.39.2
