linux-kernel - Re: [PATCH] jump_label: don't export section tags

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Date:   Fri, 10 Feb 2017 14:01:01 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Jason Baron <jbaron@...mai.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Mel Gorman <mgorman@...e.de>, Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH] jump_label: don't export section tags

On Fri, 10 Feb 2017 19:29:44 +0200
"Michael S. Tsirkin" <mst@...hat.com> wrote:

> These are supplied by the linker and only used by jump_label.c.
> This trivial patch moves them out of jump_label.h.
> 
> Cc: Jason Baron <jbaron@...mai.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Borislav Petkov <bp@...en8.de>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Mel Gorman <mgorman@...e.de>
> Cc: Ingo Molnar <mingo@...nel.org>
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
>  include/linux/jump_label.h | 3 ---
>  kernel/jump_label.c        | 4 ++++
>  2 files changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/include/linux/jump_label.h b/include/linux/jump_label.h
> index 48ed83f..21701da 100644
> --- a/include/linux/jump_label.h
> +++ b/include/linux/jump_label.h
> @@ -132,9 +132,6 @@ static __always_inline bool static_key_true(struct static_key *key)
>  	return !arch_static_branch(key, true);
>  }
>  
> -extern const struct jump_entry __start___jump_table[];
> -extern const struct jump_entry __stop___jump_table[];
> -
>  extern void jump_label_init(void);
>  extern void jump_label_lock(void);
>  extern void jump_label_unlock(void);
> diff --git a/kernel/jump_label.c b/kernel/jump_label.c
> index a9b8cf5..6eaa84c 100644
> --- a/kernel/jump_label.c
> +++ b/kernel/jump_label.c
> @@ -18,6 +18,10 @@
>  
>  #ifdef HAVE_JUMP_LABEL
>  
> +/* Supplied by a linker script */

This is common practice and obvious to anyone that does a git grep. I
don't really think the comment is necessary.

But the change itself is fine.

Reviewed-by: Steven Rostedt (VMware) <rostedt@...dmis.org>

-- Steve

> +extern struct jump_entry __start___jump_table[];
> +extern struct jump_entry __stop___jump_table[];
> +
>  /* mutex to protect coming/going of the the jump_label table */
>  static DEFINE_MUTEX(jump_label_mutex);
>