linux-kernel - Re: [PATCH] kprobes: add the "tls" argument for j_do

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Date:	Fri, 22 Apr 2016 13:58:12 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Huang Shijie <shijie.huang@....com>
Cc:	<pmladek@...e.com>, <steve.capper@....com>,
	<linux-kernel@...r.kernel.org>, <masami.hiramatsu.pt@...achi.com>,
	<nd@....com>
Subject: Re: [PATCH] kprobes: add the "tls" argument for j_do_fork

On Thu, 14 Apr 2016 17:16:40 +0800 Huang Shijie <shijie.huang@....com> wrote:

> The patch "3033f14a clone: support passing tls argument via C rather ..."
> added the tls argument for _do_fork(). The patch adds the "tls" argument
> for j_do_fork to make it match  _do_fork().
> 
> ...
>
> --- a/samples/kprobes/jprobe_example.c
> +++ b/samples/kprobes/jprobe_example.c
> @@ -25,7 +25,7 @@
>  /* Proxy routine having the same arguments as actual _do_fork() routine */
>  static long j_do_fork(unsigned long clone_flags, unsigned long stack_start,
>  	      unsigned long stack_size, int __user *parent_tidptr,
> -	      int __user *child_tidptr)
> +	      int __user *child_tidptr, unsigned long tls)
>  {
>  	pr_info("jprobe: clone_flags = 0x%lx, stack_start = 0x%lx "
>  		"stack_size = 0x%lx\n", clone_flags, stack_start, stack_size);

The changelog failed to tell us what are the runtime effects of this
bug.  Please always include this info so that others can decide
which kernel version(s) need fixing.

Thanks.