linux-kernel - Re: [PATCH v14 01/11] livepatch: Change unsigned long old_addr -> void *old_func in struct klp

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Date:   Wed, 5 Dec 2018 13:45:07 -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 v14 01/11] livepatch: Change unsigned long old_addr ->
 void *old_func in struct klp_func

On Thu, Nov 29, 2018 at 10:44:21AM +0100, Petr Mladek wrote:
> The address of the to be patched function and new function is stored
> in struct klp_func as:
> 
> 	void *new_func;
> 	unsigned long old_addr;
> 
> The different naming scheme and type is derived from the way how
                                                       ^^^^^^^^^^^
s/the way how/the way

> the addresses are set. @old_addr is assigned at runtime using
> kallsyms-based search. @new_func is statically initialized,
> for example:
> 
>   static struct klp_func funcs[] = {
> 	{
> 		.old_name = "cmdline_proc_show",
> 		.new_func = livepatch_cmdline_proc_show,
> 	}, { }
>   };
> 
> This patch changes unsigned log old_addr -> void *old_func. It removes
                     ^^^^^^^^^^^^
s/unsigned log/unsigned long

> some confusion when these address are later used in the code. It is
> motivated by a followup patch that adds special NOP struct klp_func
> where we want to assign func->new_func = func->old_addr respectively
> func->new_func = func->old_func.
> 
> This patch does not modify the existing behavior.
> 
> Suggested-by: Josh Poimboeuf <jpoimboe@...hat.com>
> Signed-off-by: Petr Mladek <pmladek@...e.com>
> ---

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

-- Joe