mmu_notifier_range_update_to_read_only() was originally introduced in
commit c6d23413f81b ("mm/mmu_notifier:
mmu_notifier_range_update_to_read_only() helper") as an optimisation
for device drivers that know a range has only been mapped
read-only. However there are no users of this feature so remove it. As
it is the only user of the struct mmu_notifier_range.vma field remove
that also.
Signed-off-by: Alistair Popple <apopple@xxxxxxxxxx>
---
include/linux/mmu_notifier.h | 2 --
mm/mmu_notifier.c | 10 ----------
2 files changed, 12 deletions(-)
diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h
index d6c06e140277..252e44afcc70 100644
--- a/include/linux/mmu_notifier.h
+++ b/include/linux/mmu_notifier.h
@@ -269,7 +269,6 @@ extern struct lockdep_map __mmu_notifier_invalidate_range_start_map;
#endif
struct mmu_notifier_range {
- struct vm_area_struct *vma;
struct mm_struct *mm;
unsigned long start;
unsigned long end;
@@ -519,7 +518,6 @@ static inline void mmu_notifier_range_init(struct mmu_notifier_range *range,
unsigned long start,
unsigned long end)
{
- range->vma = vma;
range->event = event;
range->mm = mm;
range->start = start;
diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c
index f45ff1b7626a..50c0dde1354f 100644
--- a/mm/mmu_notifier.c
+++ b/mm/mmu_notifier.c
@@ -1120,13 +1120,3 @@ void mmu_notifier_synchronize(void)
synchronize_srcu(&srcu);
}
EXPORT_SYMBOL_GPL(mmu_notifier_synchronize);
-
-bool
-mmu_notifier_range_update_to_read_only(const struct mmu_notifier_range *range)
-{
- if (!range->vma || range->event != MMU_NOTIFY_PROTECTION_VMA)
- return false;
- /* Return true if the vma still have the read flag set. */
- return range->vma->vm_flags & VM_READ;
-}
-EXPORT_SYMBOL_GPL(mmu_notifier_range_update_to_read_only);
--
2.35.1
