android/lowmemorykiller: Ignore tasks with freed mm
A killed task can stay in the task list long after its
memory has been returned to the system, therefore
ignore any tasks whose mm struct has been freed.
Change-Id: I76394b203b4ab2312437c839976f0ecb7b6dde4e
CRs-fixed: 450383
Signed-off-by: Liam Mark <lmark@codeaurora.org>
diff --git a/kernel/exit.c b/kernel/exit.c
index d8bd3b42..6096e80 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -639,6 +639,7 @@
{
struct mm_struct *mm = tsk->mm;
struct core_state *core_state;
+ int mm_released;
mm_release(tsk, mm);
if (!mm)
@@ -683,7 +684,10 @@
enter_lazy_tlb(mm, current);
task_unlock(tsk);
mm_update_next_owner(mm);
- mmput(mm);
+
+ mm_released = mmput(mm);
+ if (mm_released)
+ set_tsk_thread_flag(tsk, TIF_MM_RELEASED);
}
/*