Fix tsk->exit_state usage

tsk->exit_state can only be 0, EXIT_ZOMBIE, or EXIT_DEAD.  A non-zero test
is the same as tsk->exit_state & (EXIT_ZOMBIE | EXIT_DEAD), so just testing
tsk->exit_state is sufficient.

Signed-off-by: Eugene Teo <eugeneteo@kernel.sg>
Cc: Roland McGrath <roland@redhat.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/proc/array.c b/fs/proc/array.c
index 04b689f..7a34571 100644 (file)
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -146,8 +146,7 @@ static inline const char *get_task_state(struct task_struct *tsk)
                                            TASK_UNINTERRUPTIBLE |
                                            TASK_STOPPED |
                                            TASK_TRACED)) |
-                       (tsk->exit_state & (EXIT_ZOMBIE |
-                                           EXIT_DEAD));
+                                          tsk->exit_state;
        const char **p = &task_state_array[0];
 
        while (state) {

diff --git a/kernel/fork.c b/kernel/fork.c
index a794bfc..240aa66 100644 (file)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -117,7 +117,7 @@ EXPORT_SYMBOL(free_task);
 
 void __put_task_struct(struct task_struct *tsk)
 {
-       WARN_ON(!(tsk->exit_state & (EXIT_DEAD | EXIT_ZOMBIE)));
+       WARN_ON(!tsk->exit_state);
        WARN_ON(atomic_read(&tsk->usage));
        WARN_ON(tsk == current);
 

diff --git a/kernel/sched.c b/kernel/sched.c
index 72a809a..9d45850 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -5279,7 +5279,7 @@ static void migrate_dead(unsigned int dead_cpu, struct task_struct *p)
        struct rq *rq = cpu_rq(dead_cpu);
 
        /* Must be exiting, otherwise would be on tasklist. */
-       BUG_ON(p->exit_state != EXIT_ZOMBIE && p->exit_state != EXIT_DEAD);
+       BUG_ON(!p->exit_state);
 
        /* Cannot have done final schedule yet: would have vanished. */
        BUG_ON(p->state == TASK_DEAD);