The patch titled
pid: simplify pid iterators
has been added to the -mm tree. Its filename is
simplify-pid-iterators.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: pid: simplify pid iterators
From: Oleg Nesterov <oleg@xxxxxxxxxx>
I think it is hardly possible to read the current do_each_task_pid(). The
new version is much simpler and makes the code smaller.
Only the do_each_task_pid change is tested, the do_each_pid_task isn't.
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
include/linux/pid.h | 59 ++++++++++++++++--------------------------
1 files changed, 23 insertions(+), 36 deletions(-)
diff -puN include/linux/pid.h~simplify-pid-iterators include/linux/pid.h
--- a/include/linux/pid.h~simplify-pid-iterators
+++ a/include/linux/pid.h
@@ -101,42 +101,29 @@ static inline pid_t pid_nr(struct pid *p
return nr;
}
-#define pid_next(task, type) \
- ((task)->pids[(type)].node.next)
-#define pid_next_task(task, type) \
- hlist_entry(pid_next(task, type), struct task_struct, \
- pids[(type)].node)
-
-
-/* We could use hlist_for_each_entry_rcu here but it takes more arguments
- * than the do_each_task_pid/while_each_task_pid. So we roll our own
- * to preserve the existing interface.
- */
-#define do_each_task_pid(who, type, task) \
- if ((task = find_task_by_pid_type(type, who))) { \
- prefetch(pid_next(task, type)); \
- do {
-
-#define while_each_task_pid(who, type, task) \
- } while (pid_next(task, type) && ({ \
- task = pid_next_task(task, type); \
- rcu_dereference(task); \
- prefetch(pid_next(task, type)); \
- 1; }) ); \
- }
-
-#define do_each_pid_task(pid, type, task) \
- if ((task = pid_task(pid, type))) { \
- prefetch(pid_next(task, type)); \
- do {
-
-#define while_each_pid_task(pid, type, task) \
- } while (pid_next(task, type) && ({ \
- task = pid_next_task(task, type); \
- rcu_dereference(task); \
- prefetch(pid_next(task, type)); \
- 1; }) ); \
- }
+#define do_each_task_pid(who, type, task) \
+ do { \
+ struct hlist_node *pos___; \
+ struct pid *pid___ = find_pid(who); \
+ if (pid___ != NULL) \
+ hlist_for_each_entry_rcu((task), pos___, \
+ &pid___->tasks[type], pids[type].node) {
+
+#define while_each_task_pid(who, type, task) \
+ } \
+ } while (0)
+
+
+#define do_each_pid_task(pid, type, task) \
+ do { \
+ struct hlist_node *pos___; \
+ if (pid != NULL) \
+ hlist_for_each_entry_rcu((task), pos___, \
+ &pid->tasks[type], pids[type].node) {
+
+#define while_each_pid_task(pid, type, task) \
+ } \
+ } while (0)
#endif /* _LINUX_PID_H */
_
Patches currently in -mm which might be from oleg@xxxxxxxxxx are
sys_getppid-oopses-on-debug-kernel-v2.patch
pid-implement-transfer_pid-and-use-it-to-simplify-de_thread.patch
pid-remove-temporary-debug-code-in-attach_pid.patch
rtmutex-clean-up-and-remove-some-extra-spinlocks.patch
rtmutex-clean-up-and-remove-some-extra-spinlocks-more.patch
elf_core_dump-dont-take-tasklist_lock.patch
elf_fdpic_core_dump-dont-take-tasklist_lock.patch
has_stopped_jobs-cleanup.patch
__dequeue_signal-cleanup.patch
simplify-pid-iterators.patch
pidhash-temporary-debug-checks.patch
-
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