linux-kernel - Re: [PATCH v2 sl-b 1/5] mm: Add mem_dump_obj() to print source of memory block

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Date:   Wed, 9 Dec 2020 17:53:06 +0000
From:   Christoph Hellwig <hch@...radead.org>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     Christoph Hellwig <hch@...radead.org>, rcu@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-team@...com, mingo@...nel.org,
        jiangshanlai@...il.com, akpm@...ux-foundation.org,
        mathieu.desnoyers@...icios.com, josh@...htriplett.org,
        tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
        dhowells@...hat.com, edumazet@...gle.com, fweisbec@...il.com,
        oleg@...hat.com, joel@...lfernandes.org, iamjoonsoo.kim@....com,
        andrii@...nel.org, Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org
Subject: Re: [PATCH v2 sl-b 1/5] mm: Add mem_dump_obj() to print source of
 memory block

On Wed, Dec 09, 2020 at 06:57:02AM -0800, Paul E. McKenney wrote:
> On Wed, Dec 09, 2020 at 08:17:10AM +0000, Christoph Hellwig wrote:
> > Your two new exports don't actually seem to get used in modular code
> > at all in this series.
> 
> Indeed, and I either need to remove the exports or make my test code in
> kernel/rcu/rcuscale.o suitable for upstreaming.  Or find the appropriate
> mm/slab selftest location.

I'd rather not export something like this which pokes deep into
internals.  That being said I've been working on off on a
EXPORT_SYMBOL_FOR() that just exports a symbol to one specific module.
Hopefully I'll finish it for the next merge window, and with that
I'd feel much more comfortable with an export.