linux-kernel - Re: [PATCH v13 07/12] livepatch: Use lists to manage patches, objects and functions

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Message-ID: <20181017203107.lirzlz2sulntauqq@treble>
Date:   Wed, 17 Oct 2018 15:31:07 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Jiri Kosina <jikos@...nel.org>, Miroslav Benes <mbenes@...e.cz>,
        Jason Baron <jbaron@...mai.com>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Evgenii Shatokhin <eshatokhin@...tuozzo.com>,
        live-patching@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jessica Yu <jeyu@...nel.org>
Subject: Re: [PATCH v13 07/12] livepatch: Use lists to manage patches,
 objects and functions

On Mon, Oct 15, 2018 at 02:37:08PM +0200, Petr Mladek wrote:
> +static int klp_init_lists(struct klp_patch *patch)
> +{
> +	struct klp_object *obj;
> +	struct klp_func *func;
> +
> +	INIT_LIST_HEAD(&patch->obj_list);
> +	if (!patch->objs)
> +		return -EINVAL;
> +
> +	klp_for_each_object_static(patch, obj) {
> +		list_add(&obj->node, &patch->obj_list);
> +
> +		INIT_LIST_HEAD(&obj->func_list);
> +		if (!obj->funcs)
> +			return -EINVAL;
> +
> +		klp_for_each_func_static(obj, func)
> +			list_add(&func->node, &obj->func_list);
> +	}
> +
> +	return 0;
> +}

It may be ever-so-slightly better to use list_add_tail() instead of
list_add(), so the list order matches the array order.  I doubt the
ordering really matters, but you never know.  It could for example make
debugging a little easier in some scenarios.

-- 
Josh