From: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Subject: include/linux/pid.h: use for_each_thread() in do_each_pid_thread()
while_each_pid_thread() is using while_each_thread(), which is unsafe
under RCU lock according to commit 0c740d0afc3bff0a ("introduce
for_each_thread() to replace the buggy while_each_thread()"). Use
for_each_thread() in do_each_pid_thread() which is safe under RCU lock.
Link: http://lkml.kernel.org/r/201702011947.DBD56740.OMVHOLOtSJFFFQ@xxxxxxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/1486041779-4401-2-git-send-email-penguin-kernel@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/pid.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff -puN include/linux/pid.h~pid-use-for_each_thread-in-do_each_pid_thread include/linux/pid.h
--- a/include/linux/pid.h~pid-use-for_each_thread-in-do_each_pid_thread
+++ a/include/linux/pid.h
@@ -191,10 +191,10 @@ pid_t pid_vnr(struct pid *pid);
#define do_each_pid_thread(pid, type, task) \
do_each_pid_task(pid, type, task) { \
struct task_struct *tg___ = task; \
- do {
+ for_each_thread(tg___, task) {
#define while_each_pid_thread(pid, type, task) \
- } while_each_thread(tg___, task); \
+ } \
task = tg___; \
} while_each_pid_task(pid, type, task)
#endif /* _LINUX_PID_H */
_
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