From 558cb325485aaf655130f140e8ddd25392f6c972 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Mon, 2 Oct 2006 02:17:09 -0700 Subject: [PATCH] [PATCH] pid: add do_each_pid_task 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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/pid.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/include/linux/pid.h b/include/linux/pid.h index 359121086de..8cf9b11ed26 100644 --- a/include/linux/pid.h +++ b/include/linux/pid.h @@ -119,4 +119,17 @@ extern void FASTCALL(free_pid(struct pid *pid)); 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 */ -- 2.20.1