linux-kernel - Re: [PATCH v9 13/14] module: Move kdb

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Message-ID: <a87aac32-52b1-3d56-6331-1c241fea032f@csgroup.eu>
Date:   Wed, 2 Mar 2022 20:56:23 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Aaron Tomlin <atomlin@...hat.com>,
        Daniel Thompson <daniel.thompson@...aro.org>
CC:     "mcgrof@...nel.org" <mcgrof@...nel.org>,
        "pmladek@...e.com" <pmladek@...e.com>,
        "cl@...ux.com" <cl@...ux.com>, "mbenes@...e.cz" <mbenes@...e.cz>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "jeyu@...nel.org" <jeyu@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-modules@...r.kernel.org" <linux-modules@...r.kernel.org>,
        "void@...ifault.com" <void@...ifault.com>,
        "atomlin@...mlin.com" <atomlin@...mlin.com>,
        "allen.lkml@...il.com" <allen.lkml@...il.com>,
        "joe@...ches.com" <joe@...ches.com>,
        "msuchanek@...e.de" <msuchanek@...e.de>,
        "oleksandr@...alenko.name" <oleksandr@...alenko.name>,
        "jason.wessel@...driver.com" <jason.wessel@...driver.com>
Subject: Re: [PATCH v9 13/14] module: Move kdb_modules list out of core code



Le 02/03/2022 à 21:31, Aaron Tomlin a écrit :
> On Wed 2022-03-02 16:19 +0000, Daniel Thompson wrote:
>> On Mon, Feb 28, 2022 at 11:43:21PM +0000, Aaron Tomlin wrote:
>>> No functional change.
>>>
>>> This patch migrates kdb_modules list to core kdb code
>>> since the list of added/or loaded modules is no longer
>>> private.
>>>
>>> Reviewed-by: Christophe Leroy <christophe.leroy@...roup.eu>
>>> Signed-off-by: Aaron Tomlin <atomlin@...hat.com>
>>> ---
>>>   kernel/debug/kdb/kdb_main.c    | 5 +++++
>>>   kernel/debug/kdb/kdb_private.h | 4 ----
>>>   kernel/module/main.c           | 4 ----
>>>   3 files changed, 5 insertions(+), 8 deletions(-)
>>>
>>> diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
>>> index 0852a537dad4..5369bf45c5d4 100644
>>> --- a/kernel/debug/kdb/kdb_main.c
>>> +++ b/kernel/debug/kdb/kdb_main.c
>>> @@ -59,6 +59,11 @@ EXPORT_SYMBOL(kdb_grepping_flag);
>>>   int kdb_grep_leading;
>>>   int kdb_grep_trailing;
>>>   
>>> +#ifdef CONFIG_MODULES
>>> +extern struct list_head modules;
>>> +static struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */
> 
> Hi Daniel,
> 
>> If modules is no longer static then why do we kdb_modules at all?
>> kdb_modules is used exactly once and it can now simply be replaced
>> with &modules.
> 
> In my opinion, I would prefer to avoid an explicit include of "internal.h"
> in kernel/module. By definition it should be reserved for internal use to
> kernel/module only. Please keep to the above logic.
> 
> Christophe, Luis,
> 
> Thoughts?
> 

Do we really want to hide the 'struct list_head modules' from external 
world ?

Otherwise we could declare it in include/linux/module.h ?

Christophe