linux-kernel - Re: [PATCH 1/4] livepatch: Introduce klp_for_each

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Date:   Mon, 21 Jan 2019 17:34:27 -0500
From:   Joe Lawrence <joe.lawrence@...hat.com>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Jiri Kosina <jikos@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Miroslav Benes <mbenes@...e.cz>,
        Jason Baron <jbaron@...mai.com>,
        Evgenii Shatokhin <eshatokhin@...tuozzo.com>,
        live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] livepatch: Introduce klp_for_each_patch macro

On Wed, Jan 16, 2019 at 05:17:17PM +0100, Petr Mladek wrote:
> There are already macros to iterate over struct klp_func and klp_object.
> 
> Add also klp_for_each_patch(). But make it internal because also
> klp_patches list is internal.
> 
> Suggested-by: Josh Poimboeuf <jpoimboe@...hat.com>
> Signed-off-by: Petr Mladek <pmladek@...e.com>
> ---
>  kernel/livepatch/core.c       | 8 ++++----
>  kernel/livepatch/core.h       | 6 ++++++
>  kernel/livepatch/transition.c | 2 +-
>  3 files changed, 11 insertions(+), 5 deletions(-)
> 
> diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
> index adca5cf07f7e..b716a6289204 100644
> --- a/kernel/livepatch/core.c
> +++ b/kernel/livepatch/core.c
> @@ -554,7 +554,7 @@ static int klp_add_nops(struct klp_patch *patch)
>  	struct klp_patch *old_patch;
>  	struct klp_object *old_obj;
>  
> -	list_for_each_entry(old_patch, &klp_patches, list) {
> +	klp_for_each_patch(old_patch) {
>  		klp_for_each_object(old_patch, old_obj) {
>  			int err;
>  
> @@ -1089,7 +1089,7 @@ void klp_discard_replaced_patches(struct klp_patch *new_patch)
>  {
>  	struct klp_patch *old_patch, *tmp_patch;
>  
> -	list_for_each_entry_safe(old_patch, tmp_patch, &klp_patches, list) {
> +	klp_for_each_patch_safe(old_patch, tmp_patch) {
>  		if (old_patch == new_patch)
>  			return;
>  
> @@ -1133,7 +1133,7 @@ static void klp_cleanup_module_patches_limited(struct module *mod,
>  	struct klp_patch *patch;
>  	struct klp_object *obj;
>  
> -	list_for_each_entry(patch, &klp_patches, list) {
> +	klp_for_each_patch(patch) {
>  		if (patch == limit)
>  			break;
>  
> @@ -1180,7 +1180,7 @@ int klp_module_coming(struct module *mod)
>  	 */
>  	mod->klp_alive = true;
>  
> -	list_for_each_entry(patch, &klp_patches, list) {
> +	klp_for_each_patch(patch) {
>  		klp_for_each_object(patch, obj) {
>  			if (!klp_is_module(obj) || strcmp(obj->name, mod->name))
>  				continue;
> diff --git a/kernel/livepatch/core.h b/kernel/livepatch/core.h
> index e6200f38701f..ec43a40b853f 100644
> --- a/kernel/livepatch/core.h
> +++ b/kernel/livepatch/core.h
> @@ -7,6 +7,12 @@
>  extern struct mutex klp_mutex;
>  extern struct list_head klp_patches;
>  
> +#define klp_for_each_patch_safe(patch, tmp_patch)		\
> +	list_for_each_entry_safe(patch, tmp_patch, &klp_patches, list)
> +
> +#define klp_for_each_patch(patch)	\
> +	list_for_each_entry(patch, &klp_patches, list)
> +
>  void klp_free_patch_start(struct klp_patch *patch);
>  void klp_discard_replaced_patches(struct klp_patch *new_patch);
>  void klp_discard_nops(struct klp_patch *new_patch);
> diff --git a/kernel/livepatch/transition.c b/kernel/livepatch/transition.c
> index 300273819674..a3a6f32c6fd0 100644
> --- a/kernel/livepatch/transition.c
> +++ b/kernel/livepatch/transition.c
> @@ -642,6 +642,6 @@ void klp_force_transition(void)
>  	for_each_possible_cpu(cpu)
>  		klp_update_patch_state(idle_task(cpu));
>  
> -	list_for_each_entry(patch, &klp_patches, list)
> +	klp_for_each_patch(patch)
>  		patch->forced = true;
>  }
> -- 
> 2.13.7
> 

Acked-by: Joe Lawrence <joe.lawrence@...hat.com>

-- Joe