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 <ebiederm at xmission.com> --- 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