From: Ma Wupeng <[email protected]>
Since only PAT in x86 use follow_phys(), move this to from memory.c to
memtype.c and make it static.
Since config HAVE_IOREMAP_PROT is selected by x86, drop this config macro.
Signed-off-by: Ma Wupeng <[email protected]>
---
arch/x86/mm/pat/memtype.c | 28 ++++++++++++++++++++++++++++
include/linux/mm.h | 2 --
mm/memory.c | 28 ----------------------------
3 files changed, 28 insertions(+), 30 deletions(-)
diff --git a/arch/x86/mm/pat/memtype.c b/arch/x86/mm/pat/memtype.c
index 0904d7e8e126..d8c37aaaf041 100644
--- a/arch/x86/mm/pat/memtype.c
+++ b/arch/x86/mm/pat/memtype.c
@@ -950,6 +950,34 @@ static void free_pfn_range(u64 paddr, unsigned long size)
memtype_free(paddr, paddr + size);
}
+static int follow_phys(struct vm_area_struct *vma,
+ unsigned long address, unsigned int flags,
+ unsigned long *prot, resource_size_t *phys)
+{
+ int ret = -EINVAL;
+ pte_t *ptep, pte;
+ spinlock_t *ptl;
+
+ if (!(vma->vm_flags & (VM_IO | VM_PFNMAP)))
+ goto out;
+
+ if (follow_pte(vma->vm_mm, address, &ptep, &ptl))
+ goto out;
+ pte = ptep_get(ptep);
+
+ if ((flags & FOLL_WRITE) && !pte_write(pte))
+ goto unlock;
+
+ *prot = pgprot_val(pte_pgprot(pte));
+ *phys = (resource_size_t)pte_pfn(pte) << PAGE_SHIFT;
+
+ ret = 0;
+unlock:
+ pte_unmap_unlock(ptep, ptl);
+out:
+ return ret;
+}
+
/*
* track_pfn_copy is called when vma that is covering the pfnmap gets
* copied through copy_page_range().
diff --git a/include/linux/mm.h b/include/linux/mm.h
index f5a97dec5169..75c683f2f5ae 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2375,8 +2375,6 @@ 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,
void *buf, int len, int write);
diff --git a/mm/memory.c b/mm/memory.c
index 15f8b10ea17c..86ad7f1ca3af 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -5802,34 +5802,6 @@ int follow_pfn(struct vm_area_struct *vma, unsigned long address,
EXPORT_SYMBOL(follow_pfn);
#ifdef CONFIG_HAVE_IOREMAP_PROT
-int follow_phys(struct vm_area_struct *vma,
- unsigned long address, unsigned int flags,
- unsigned long *prot, resource_size_t *phys)
-{
- int ret = -EINVAL;
- pte_t *ptep, pte;
- spinlock_t *ptl;
-
- if (!(vma->vm_flags & (VM_IO | VM_PFNMAP)))
- goto out;
-
- if (follow_pte(vma->vm_mm, address, &ptep, &ptl))
- goto out;
- pte = ptep_get(ptep);
-
- if ((flags & FOLL_WRITE) && !pte_write(pte))
- goto unlock;
-
- *prot = pgprot_val(pte_pgprot(pte));
- *phys = (resource_size_t)pte_pfn(pte) << PAGE_SHIFT;
-
- ret = 0;
-unlock:
- pte_unmap_unlock(ptep, ptl);
-out:
- return ret;
-}
-
/**
* generic_access_phys - generic implementation for iomem mmap access
* @vma: the vma to access
--
2.25.1