linux-kernel - Re: [PATCH 01/32] do_fork(): Rename 'stack

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Date:	Fri, 13 Mar 2015 16:04:58 -0700
From:	josh@...htriplett.org
To:	Alex Dowad <alexinbeijing@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Rik van Riel <riel@...hat.com>,
	Vladimir Davydov <vdavydov@...allels.com>
Subject: Re: [PATCH 01/32] do_fork(): Rename 'stack_size' argument to
 reflect actual use

On Fri, Mar 13, 2015 at 08:04:16PM +0200, Alex Dowad wrote:
> The 'stack_size' argument is never used to pass a stack size. It's only used when
> forking a kernel thread, in which case it is an argument which should be passed
> to the 'main' function which the kernel thread executes. Hence, rename it to
> 'kthread_arg'.

That's not the only use of stack_size.  Take a look at the clone2 system
call (very minimally documented in the clone manpage) and the
implementation of copy_thread on ia64, which does use stack_size in the
non-kthread path.

- Josh Triplett
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