linux-kernel - Re: [PATCH v3 2/4] module: Update a comment describing what is protected by module

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Message-ID: <Y01JA8vzY3uVSJeY@alley>
Date:   Mon, 17 Oct 2022 14:22:27 +0200
From:   Petr Mladek <pmladek@...e.com>
To:     Petr Pavlu <petr.pavlu@...e.com>
Cc:     mcgrof@...nel.org, david@...hat.com, linux-modules@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/4] module: Update a comment describing what is
 protected by module_mutex

On Sun 2022-10-16 14:30:29, Petr Pavlu wrote:

> Signed-off-by: Petr Pavlu <petr.pavlu@...e.com>
> ---
>  kernel/module/main.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/kernel/module/main.c b/kernel/module/main.c
> index a12e177ea81f..5288843ca40f 100644
> --- a/kernel/module/main.c
> +++ b/kernel/module/main.c
> @@ -62,10 +62,11 @@
>  
>  /*
>   * Mutex protects:
> - * 1) List of modules (also safely readable with preempt_disable),
> + * 1) list of modules (also safely readable with preempt_disable, delete and add

This is slightly over 80 characters per line ;-)

It is not reported by checkpatch.pl because the longer line sometimes
makes the code better readable. So people asked to make checkpatch.pl
more relaxed and accept lines < 100. But the 80-characters per-line
rule is still there. It should be honored when it does not make things
visibly worse.

> + *    uses RCU list operations).

>   * 2) module_use links,
> - * 3) mod_tree.addr_min/mod_tree.addr_max.
> - * (delete and add uses RCU list operations).
> + * 3) mod_tree.addr_min/mod_tree.addr_max,
> + * 4) list of unloaded_tainted_modules.

Please, mention that this list can be safely read using RCU.
It is similar to the list of modules.

Also it would be nice to mention the commit 99bd9956551b27cb6f
("module: Introduce module unload taint tracking") in the commit
message. It helps to find the related code. Also this is kind
of a followup fix.

>   */
>  DEFINE_MUTEX(module_mutex);
>  LIST_HEAD(modules);

All the above are minor or cosmetic issues. Feel free to use:

Reviewed-by: Petr Mladek <pmladek@...e.com>

Best Regards,
Petr