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Use struct pid parameter in copy_process()

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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 <sukadev@us.ibm.com>
Cc: Cedric Le Goater <clg@fr.ibm.com>
Cc: Dave Hansen <haveblue@us.ibm.com>
Cc: Serge Hallyn <serue@us.ibm.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: <containers@lists.osdl.org>
Acked-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sukadev Bhattiprolu 2007-05-10 22:23:03 -07:00 committed by Linus Torvalds
parent 0e29b24aa6
commit 85868995d9
1 changed files with 6 additions and 5 deletions
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11
kernel/fork.c
View file

@ -956,7 +956,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
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(unsigned long clone_flags,
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);
retval = -EFAULT;
if (clone_flags & CLONE_PARENT_SETTID)
if (put_user(p->pid, parent_tidptr))
@ -1261,7 +1261,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
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(int cpu)
struct task_struct *task;
struct pt_regs regs;
task = copy_process(CLONE_VM, 0, idle_regs(&regs), 0, NULL, NULL, 0);
task = copy_process(CLONE_VM, 0, idle_regs(&regs), 0, NULL, NULL,
&init_struct_pid);
if (!IS_ERR(task))
init_idle(task, cpu);
@ -1375,7 +1376,7 @@ long do_fork(unsigned long clone_flags,
clone_flags |= CLONE_PTRACE;
}
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.