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

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Message-ID: <alpine.LSU.2.21.1812031339170.22317@pobox.suse.cz>
Date:   Mon, 3 Dec 2018 14:24:21 +0100 (CET)
From:   Miroslav Benes <mbenes@...e.cz>
To:     Petr Mladek <pmladek@...e.com>
cc:     Jiri Kosina <jikos@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        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
Subject: Re: [PATCH v14 01/11] livepatch: Change unsigned long old_addr ->
 void *old_func in struct klp_func

On Thu, 29 Nov 2018, 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
> 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
> 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>
> ---
>  include/linux/livepatch.h     |  4 ++--
>  kernel/livepatch/core.c       |  6 +++---
>  kernel/livepatch/patch.c      | 18 ++++++++++--------
>  kernel/livepatch/patch.h      |  2 +-
>  kernel/livepatch/transition.c |  4 ++--
>  5 files changed, 18 insertions(+), 16 deletions(-)

kernel/livepatch/patch.h also mentions old_addr in a comment.

You can add

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

with that fixed.

Miroslav