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authorArnd Bergmann <arnd@arndb.de>2018-03-09 23:11:26 +0100
committerArnd Bergmann <arnd@arndb.de>2018-03-16 10:56:10 +0100
commit1a8429132e1d2ada3832db5b4a0802c49affb750 (patch)
tree4653a5067340d1701596e1756651d59eca7b07b9 /mm
parente05a959f4b9ae8d9693a8a7347d42d9e45edb3b6 (diff)
mm: remove blackfin MPU support
The CONFIG_MPU option was only defined on blackfin, and that architecture is now being removed, so the respective code can be simplified. A lot of other microcontrollers have an MPU, but I suspect that if we want to bring that support back, we'd do it differently anyway. Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'mm')
-rw-r--r--mm/nommu.c20
1 files changed, 0 insertions, 20 deletions
diff --git a/mm/nommu.c b/mm/nommu.c
index ebb6e618dade..838a8fdec5c2 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -663,22 +663,6 @@ static void put_nommu_region(struct vm_region *region)
}
/*
- * update protection on a vma
- */
-static void protect_vma(struct vm_area_struct *vma, unsigned long flags)
-{
-#ifdef CONFIG_MPU
- struct mm_struct *mm = vma->vm_mm;
- long start = vma->vm_start & PAGE_MASK;
- while (start < vma->vm_end) {
- protect_page(mm, start, flags);
- start += PAGE_SIZE;
- }
- update_protections(mm);
-#endif
-}
-
-/*
* add a VMA into a process's mm_struct in the appropriate place in the list
* and tree and add to the address space's page tree also if not an anonymous
* page
@@ -695,8 +679,6 @@ static void add_vma_to_mm(struct mm_struct *mm, struct vm_area_struct *vma)
mm->map_count++;
vma->vm_mm = mm;
- protect_vma(vma, vma->vm_flags);
-
/* add the VMA to the mapping */
if (vma->vm_file) {
mapping = vma->vm_file->f_mapping;
@@ -757,8 +739,6 @@ static void delete_vma_from_mm(struct vm_area_struct *vma)
struct mm_struct *mm = vma->vm_mm;
struct task_struct *curr = current;
- protect_vma(vma, 0);
-
mm->map_count--;
for (i = 0; i < VMACACHE_SIZE; i++) {
/* if the vma is cached, invalidate the entire cache */