linux-kernel - Re: [RFC][v6][PATCH 8/9]: Define clone_with

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Date:	Thu, 10 Sep 2009 14:28:37 -0700
From:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-kernel@...r.kernel.org, Oren Laadan <orenl@...columbia.edu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Andrew Morton <akpm@...l.org>, torvalds@...ux-foundation.org,
	mikew@...gle.com, mingo@...e.hu, hpa@...or.com,
	Nathan Lynch <nathanl@...tin.ibm.com>,
	Containers <containers@...ts.linux-foundation.org>,
	sukadev@...ibm.com
Subject: Re: [RFC][v6][PATCH 8/9]: Define clone_with_pids() syscall

Arnd Bergmann [arnd@...db.de] wrote:
| 
| I wonder if we can avoid spreading copies of this function across
| all architectures.
| 
| Would it be possible to define it like this?

Since this is a variant of clone() and clone is listed as a PTREGSCALL(),
I pass in the pt_regs.

arch/x86/kernel/entry_32.S lists clone() under this comment:

/*
 * System calls that need a pt_regs pointer.
 */

Is there a guideline on what system calls use/need pt_regs ?

Thanks,

Suakdev

| 
| asmlinkage long
| clone_with_pids(int flags, unsigned long child_stack_base, int __user *parent_tid_ptr,
|                        int __user *child_tid_ptr, struct pid_set __user *pid_setp)
| {
| 	if (!child_stack_base) {
| 		struct pt_regs *regs;
| 
| 		regs = task_pt_regs(current);
| 		child_stack_base = user_stack_pointer(regs);
| 	}
| 
| 	return do_fork_with_pids(clone_flags, child_stack_base, 0,
| 		parent_tid_ptr, child_tid_ptr, pid_setp);
| }
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