To avoid pid rollover confusion the kernel needs to work with
struct pid * instead of pid_t. Currently there is not an iterator
that walks through all of the tasks of a given pid type starting
with a struct pid. This prevents us replacing some pid_t instances
with struct pid. So this patch adds do_each_pid_task which walks
through the set of task for a given pid type starting with a struct pid.
Signed-off-by: Eric W. Biederman <[email protected]>
---
include/linux/pid.h | 13 +++++++++++++
1 files changed, 13 insertions(+), 0 deletions(-)
diff --git a/include/linux/pid.h b/include/linux/pid.h
index 93da7e2..4007114 100644
--- a/include/linux/pid.h
+++ b/include/linux/pid.h
@@ -118,4 +118,17 @@ #define while_each_task_pid(who, type, t
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; }) ); \
+ }
+
#endif /* _LINUX_PID_H */
--
1.4.2.rc3.g7e18e-dirty
-
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