linux-kernel - Re: [RFC][v8][PATCH 0/10] Implement clone3() system call

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Date:	Tue, 13 Oct 2009 13:50:15 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, Oren Laadan <orenl@...columbia.edu>,
	serue@...ibm.com, "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>, arnd@...db.de,
	peterz@...radead.org, Louis.Rilling@...labs.com,
	kosaki.motohiro@...fujitsu.com, randy.dunlap@...cle.com,
	linux-api@...r.kernel.org,
	Containers <containers@...ts.linux-foundation.org>,
	sukadev@...ibm.com
Subject: Re: [RFC][v8][PATCH 0/10] Implement clone3() system call

Some userland debugging things and so forth like to look at the clone_flags
argument, so that is kept simpler for them if it stays in a register
(i.e. its own argument) rather than a user pointer fetch for that argument.
Any problem with:

	sys_clone3(unsigned long clone_flags,
		   struct clone_struct __user *cs, pid_t __user *pids)

?

That also has the side benefit that instead of non-ia64 users forever
asking, "Why is it clone3 when there is no clone2?" you can instead pretend
that it follows the "clone3 because it takes three arguments" convention. ;-)

Btw, IMHO "struct foo_struct" is one of the lamest naming conventions ever.
How about "struct clone_args"?

Also, if you were to replace:

		u64 child_stack;

with:

		u64 child_stack_base;
		u64 child_stack_size;

and use in sys_clone3 (for most arch's):

	child_stack_ptr = kcs.child_stack_base + kcs.child_stack_size;

then the same clone3 interface would cover ia64 as well.

Thanks,
Roland
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