linux-kernel - Re: [PATCH] livepatch: make klp

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Date:   Wed, 8 Mar 2017 12:31:34 +0100 (CET)
From:   Miroslav Benes <mbenes@...e.cz>
To:     Jiri Kosina <jikos@...nel.org>
cc:     Josh Poimboeuf <jpoimboe@...hat.com>, Jessica Yu <jeyu@...hat.com>,
        Petr Mladek <pmladek@...e.com>, live-patching@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] livepatch: make klp_mutex proper part of API

On Wed, 8 Mar 2017, Jiri Kosina wrote:

> From: Jiri Kosina <jkosina@...e.cz>
> 
> klp_mutex is shared between core.c and transition.c, and as such would 
> rather be properly located in livepatch.h so that we don't have to play 
> 'extern' games from .c sources.
> 
> This also silences sparse warning (wrongly) suggesting that klp_mutex 
> should be defined static.
> 
> Signed-off-by: Jiri Kosina <jkosina@...e.cz>
> ---
>  include/linux/livepatch.h     | 2 ++
>  kernel/livepatch/transition.c | 2 --
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/livepatch.h b/include/linux/livepatch.h
> index 194991ef9347..4efa89f95dd7 100644
> --- a/include/linux/livepatch.h
> +++ b/include/linux/livepatch.h
> @@ -138,6 +138,8 @@ struct klp_patch {
>  	     func->old_name || func->new_func || func->old_sympos; \
>  	     func++)
>  
> +extern struct mutex klp_mutex;
> +
>  int klp_register_patch(struct klp_patch *);
>  int klp_unregister_patch(struct klp_patch *);
>  int klp_enable_patch(struct klp_patch *);
> diff --git a/kernel/livepatch/transition.c b/kernel/livepatch/transition.c
> index 0ab7abd53b0b..14f7ce64b002 100644
> --- a/kernel/livepatch/transition.c
> +++ b/kernel/livepatch/transition.c
> @@ -28,8 +28,6 @@
>  #define MAX_STACK_ENTRIES  100
>  #define STACK_ERR_BUF_SIZE 128
>  
> -extern struct mutex klp_mutex;
> -

A nit, but could you also include "linux/livepatch.h" in transition.c to 
make the dependency explicit (and not through patch.h or transition.h)?

Anyway, not a big deal and you can add my

Acked-by: Miroslav Benes <mbenes@...e.cz>

Miroslav