linux-kernel - Re: [PATCH v4] kdb: Simplify kdb commands registration

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Message-ID: <20210222134750.zc473zz42bz4teu3@maple.lan>
Date:   Mon, 22 Feb 2021 13:47:50 +0000
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Sumit Garg <sumit.garg@...aro.org>
Cc:     kgdb-bugreport@...ts.sourceforge.net,
        Jason Wessel <jason.wessel@...driver.com>,
        Douglas Anderson <dianders@...omium.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] kdb: Simplify kdb commands registration

On Mon, Feb 22, 2021 at 06:33:18PM +0530, Sumit Garg wrote:
> On Mon, 22 Feb 2021 at 17:35, Daniel Thompson
> <daniel.thompson@...aro.org> wrote:
> >
> > On Thu, Feb 18, 2021 at 05:39:58PM +0530, Sumit Garg 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 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.
> >
> > I'm not sure this is the right approach. It's still faking dynamic usage
> > when none of the callers at this stage of the boot actually are dynamic.
> >
> 
> Okay, as an alternative I came across dbg_kmalloc()/dbg_kfree() as well but ...

Last time I traced these functions I concluded that this heap can be
removed if the symbol handling code is refactored a little. I'd be
*seriously* reluctant to add any new callers... which I assume from your
later comments you can live with ;-) .


Daniel.