linux-kernel - Re: [PATCH 03/32] arc: copy_thread(): rename 'arg' argument to 'kthread

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Date:	Wed, 25 Mar 2015 11:47:21 +0000
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	Alex Dowad <alexinbeijing@...il.com>,
	"linux-kernel@...t.kernel.org" <linux-kernel@...t.kernel.org>
CC:	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 03/32] arc: copy_thread(): rename 'arg' argument to
 'kthread_arg'

On Friday 13 March 2015 11:35 PM, Alex Dowad wrote:
> The 'arg' argument to copy_thread() is only ever used when forking a new
> kernel thread. Hence, rename it to 'kthread_arg' for clarity (and consistency
> with do_fork() and other arch-specific implementations of copy_thread()).
>
> Signed-off-by: Alex Dowad <alexinbeijing@...il.com>
> ---
>  arch/arc/kernel/process.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/arch/arc/kernel/process.c b/arch/arc/kernel/process.c
> index fdd8971..cf366bd 100644
> --- a/arch/arc/kernel/process.c
> +++ b/arch/arc/kernel/process.c
> @@ -49,7 +49,9 @@ void arch_cpu_idle(void)
>  
>  asmlinkage void ret_from_fork(void);
>  
> -/* Layout of Child kernel mode stack as setup at the end of this function is
> +/* Copy architecture-specific thread state
> + *
> + * Layout of Child kernel mode stack as setup at the end of this function is
>   *
>   * |     ...        |
>   * |     ...        |
> @@ -81,7 +83,7 @@ asmlinkage void ret_from_fork(void);
>   * ------------------  <===== END of PAGE
>   */
>  int copy_thread(unsigned long clone_flags,
> -		unsigned long usp, unsigned long arg,
> +		unsigned long usp, unsigned long kthread_arg,
>  		struct task_struct *p)
>  {
>  	struct pt_regs *c_regs;        /* child's pt_regs */
> @@ -110,9 +112,10 @@ int copy_thread(unsigned long clone_flags,
>  	childksp[1] = (unsigned long)ret_from_fork; /* blink */
>  
>  	if (unlikely(p->flags & PF_KTHREAD)) {
> +		/* kernel thread */

This seems extraneous given that PF_KTHREAD above check makes is obvious that this
is a kernel thread.

>  		memset(c_regs, 0, sizeof(struct pt_regs));
>  
> -		c_callee->r13 = arg; /* argument to kernel thread */
> +		c_callee->r13 = kthread_arg;
>  		c_callee->r14 = usp;  /* function */
>  
>  		return 0;

Applied to for-next after pruning the comment above.

Thx,
-Vineet
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