linux-kernel - Re: [PATCH v5] kdb: Simplify kdb commands registration

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Message-ID: <CAD=FV=XQAWoAQ1kkyJ1QzhJgueCj0Lui1m5cxgPQXzThxm1SGw@mail.gmail.com>
Date:   Mon, 1 Mar 2021 10:40:41 -0800
From:   Doug Anderson <dianders@...omium.org>
To:     Sumit Garg <sumit.garg@...aro.org>
Cc:     kgdb-bugreport@...ts.sourceforge.net,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Jason Wessel <jason.wessel@...driver.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5] kdb: Simplify kdb commands registration

Hi,

On Tue, Feb 23, 2021 at 11:08 PM Sumit Garg <sumit.garg@...aro.org> wrote:
>
> Simplify kdb commands registration via using linked list instead of
> static array for commands storage.
>
> Signed-off-by: Sumit Garg <sumit.garg@...aro.org>
> ---
>
> Changes in v5:
> - Introduce new method: kdb_register_table() to register static kdb
>   main and breakpoint command tables instead of using statically
>   allocated commands.
>
> Changes in v4:
> - Fix kdb commands memory allocation issue prior to slab being available
>   with an array of statically allocated commands. Now it works fine with
>   kgdbwait.
> - Fix a misc checkpatch warning.
> - I have dropped Doug's review tag as I think this version includes a
>   major fix that should be reviewed again.
>
> Changes in v3:
> - Remove redundant "if" check.
> - Pick up review tag from Doug.
>
> Changes in v2:
> - Remove redundant NULL check for "cmd_name".
> - Incorporate misc. comment.
>
>  kernel/debug/kdb/kdb_bp.c      |  81 ++++--
>  kernel/debug/kdb/kdb_main.c    | 472 ++++++++++++++++++++-------------
>  kernel/debug/kdb/kdb_private.h |   3 +
>  3 files changed, 343 insertions(+), 213 deletions(-)

This looks good to me, thanks!

Random notes:

* We no longer check for "duplicate" commands for any of these
statically allocated ones, but I guess that's fine.

* Presumably nothing outside of kdb/kgdb itself needs the ability to
allocate commands statically.  The only user I see now is ftrace and
it looks like it runs late enough that it should be fine.

Reviewed-by: Douglas Anderson <dianders@...omium.org>


-Doug