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    Subject[PATCH 3/4] pids: sys_setpgid: use change_pid() helper
    Use change_pid() instead of detach_pid() + attach_pid() in sys_setpgid().

    This way task_pgrp() is not NULL in between.

    Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>

    --- 25/kernel/sys.c~3_SETPGRP 2008-02-18 19:15:40.000000000 +0300
    +++ 25/kernel/sys.c 2008-03-20 18:21:17.000000000 +0300
    @@ -972,8 +972,7 @@ asmlinkage long sys_setpgid(pid_t pid, p
    goto out;

    if (task_pgrp(p) != pgrp) {
    - detach_pid(p, PIDTYPE_PGID);
    - attach_pid(p, PIDTYPE_PGID, pgrp);
    + change_pid(p, PIDTYPE_PGID, pgrp);
    set_task_pgrp(p, pid_nr(pgrp));
    }



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