From: Sukadev Bhattiprolu Modify copy_process() to take a struct pid * parameter instead of a pid_t. This simplifies the code a bit and also avoids having to call find_pid() to convert the pid_t to a struct pid. Changelog: - Fixed Badari Pulavarty's comments and passed in &init_struct_pid from fork_idle(). - Fixed Eric Biederman's comments and simplified this patch and used a new patch to remove the likely(pid) check. Signed-off-by: Sukadev Bhattiprolu Cc: Cedric Le Goater Cc: Dave Hansen Cc: Serge Hallyn Cc: Eric Biederman Cc: Acked-by: Eric W. Biederman Signed-off-by: Andrew Morton --- kernel/fork.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff -puN kernel/fork.c~use-struct-pid-parameter-in-copy_process kernel/fork.c --- a/kernel/fork.c~use-struct-pid-parameter-in-copy_process +++ a/kernel/fork.c @@ -956,7 +956,7 @@ static struct task_struct *copy_process( unsigned long stack_size, int __user *parent_tidptr, int __user *child_tidptr, - int pid) + struct pid *pid) { int retval; struct task_struct *p = NULL; @@ -1023,7 +1023,7 @@ static struct task_struct *copy_process( p->did_exec = 0; delayacct_tsk_init(p); /* Must remain after dup_task_struct() */ copy_flags(clone_flags, p); - p->pid = pid; + p->pid = pid_nr(pid); INIT_LIST_HEAD(&p->children); INIT_LIST_HEAD(&p->sibling); @@ -1254,7 +1254,7 @@ static struct task_struct *copy_process( list_add_tail_rcu(&p->tasks, &init_task.tasks); __get_cpu_var(process_counts)++; } - attach_pid(p, PIDTYPE_PID, find_pid(p->pid)); + attach_pid(p, PIDTYPE_PID, pid); nr_threads++; } @@ -1325,7 +1325,8 @@ struct task_struct * __cpuinit fork_idle struct task_struct *task; struct pt_regs regs; - task = copy_process(CLONE_VM, 0, idle_regs(®s), 0, NULL, NULL, 0); + task = copy_process(CLONE_VM, 0, idle_regs(®s), 0, NULL, NULL, + &init_struct_pid); if (!IS_ERR(task)) init_idle(task, cpu); @@ -1353,7 +1354,7 @@ long do_fork(unsigned long clone_flags, return -EAGAIN; nr = pid->nr; - p = copy_process(clone_flags, stack_start, regs, stack_size, parent_tidptr, child_tidptr, nr); + p = copy_process(clone_flags, stack_start, regs, stack_size, parent_tidptr, child_tidptr, pid); /* * Do this prior waking up the new thread - the thread pointer * might get invalid after that point, if the thread exits quickly. _