On Wed, Apr 09, 2014 at 09:49:57PM +0200, Peter Zijlstra wrote:
> Anyway, I'll look over the stuff tomorrow.
That patch was missing useful clues..
Also, I shot __for_each_thread in the head, it seemed useless.
---
include/linux/sched.h | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 7cb07fd26680..6f995bef45d3 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2377,6 +2377,9 @@ extern bool current_is_single_threaded(void);
/*
* Careful: do_each_thread/while_each_thread is a double loop so
* 'break' will not work as expected - use goto instead.
+ *
+ * Deprecated; use for_each_thread() instead; this has serious issues with
+ * g != current and RCU.
*/
#define do_each_thread(g, t) \
for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
@@ -2384,11 +2387,8 @@ extern bool current_is_single_threaded(void);
#define while_each_thread(g, t) \
while ((t = next_thread(t)) != g)
-#define __for_each_thread(signal, t) \
- list_for_each_entry_rcu(t, &(signal)->thread_head, thread_node)
-
#define for_each_thread(p, t) \
- __for_each_thread((p)->signal, t)
+ list_for_each_entry_rcu(t, &(p)->signal->thread_head, thread_node)
/* Careful: this is a double loop, 'break' won't work as expected. */
#define for_each_process_thread(p, t) \
@@ -2421,7 +2421,8 @@ bool same_thread_group(struct task_struct *p1, struct
task_struct *p2)
return p1->signal == p2->signal;
}
-static inline struct task_struct *next_thread(const struct task_struct *p)
+static inline __deprecated
+struct task_struct *next_thread(const struct task_struct *p)
{
return list_entry_rcu(p->thread_group.next,
struct task_struct, thread_group);
--
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