X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=mm%2Foom_kill.c;h=989f35a2bbb1deafe9d47789e74a9f13d2e72831;hb=e1d30510a9551c1027f242fa72bfea2faa79847b;hp=831340e7ad8b4721a066c7d7d850e9b841ab38ff;hpb=5ffc06ebeaab65d8e08df6953caf8155df2c45f8;p=platform%2Fkernel%2Flinux-starfive.git

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 831340e..989f35a 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -1150,7 +1150,7 @@ SYSCALL_DEFINE2(process_mrelease, int, pidfd, unsigned int, flags)
 	struct task_struct *task;
 	struct task_struct *p;
 	unsigned int f_flags;
-	bool reap = true;
+	bool reap = false;
 	struct pid *pid;
 	long ret = 0;
 
@@ -1177,15 +1177,15 @@ SYSCALL_DEFINE2(process_mrelease, int, pidfd, unsigned int, flags)
 		goto put_task;
 	}
 
-	mm = p->mm;
-	mmgrab(mm);
-
-	/* If the work has been done already, just exit with success */
-	if (test_bit(MMF_OOM_SKIP, &mm->flags))
-		reap = false;
-	else if (!task_will_free_mem(p)) {
-		reap = false;
-		ret = -EINVAL;
+	if (mmget_not_zero(p->mm)) {
+		mm = p->mm;
+		if (task_will_free_mem(p))
+			reap = true;
+		else {
+			/* Error only if the work has not been done already */
+			if (!test_bit(MMF_OOM_SKIP, &mm->flags))
+				ret = -EINVAL;
+		}
 	}
 	task_unlock(p);
 
@@ -1201,7 +1201,8 @@ SYSCALL_DEFINE2(process_mrelease, int, pidfd, unsigned int, flags)
 	mmap_read_unlock(mm);
 
 drop_mm:
-	mmdrop(mm);
+	if (mm)
+		mmput(mm);
 put_task:
 	put_task_struct(task);
 put_pid: