From: Davidlohr Bueso <dave@xxxxxxxxxxxx>
... and use mm locking wrappers -- no change is semantics.
Signed-off-by: Davidlohr Bueso <dbueso@xxxxxxx>
---
kernel/exit.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/kernel/exit.c b/kernel/exit.c
index 42ca71a44c9a..a9540f157eb2 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -495,6 +495,7 @@ static void exit_mm(void)
{
struct mm_struct *mm = current->mm;
struct core_state *core_state;
+ DEFINE_RANGE_LOCK_FULL(mmrange);
mm_release(current, mm);
if (!mm)
@@ -507,12 +508,12 @@ static void exit_mm(void)
* will increment ->nr_threads for each thread in the
* group with ->mm != NULL.
*/
- down_read(&mm->mmap_sem);
+ mm_read_lock(mm, &mmrange);
core_state = mm->core_state;
if (core_state) {
struct core_thread self;
- up_read(&mm->mmap_sem);
+ mm_read_unlock(mm, &mmrange);
self.task = current;
self.next = xchg(&core_state->dumper.next, &self);
@@ -530,14 +531,14 @@ static void exit_mm(void)
freezable_schedule();
}
__set_current_state(TASK_RUNNING);
- down_read(&mm->mmap_sem);
+ mm_read_lock(mm, &mmrange);
}
mmgrab(mm);
BUG_ON(mm != current->active_mm);
/* more a memory barrier than a real lock */
task_lock(current);
current->mm = NULL;
- up_read(&mm->mmap_sem);
+ mm_read_unlock(mm, &mmrange);
enter_lazy_tlb(mm, current);
task_unlock(current);
mm_update_next_owner(mm);
--
2.13.6
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