linux-kernel - Re: [PATCH 1/2] mm/vmalloc: Add a safer version of find_vm

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Date:   Wed, 30 Aug 2023 09:09:27 -0400
From:   Joel Fernandes <joel@...lfernandes.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Uladzislau Rezki <urezki@...il.com>,
        Lorenzo Stoakes <lstoakes@...il.com>,
        Zhen Lei <thunder.leizhen@...weicloud.com>,
        "Paul E . McKenney" <paulmck@...nel.org>, rcu@...r.kernel.org,
        Zqiang <qiang.zhang1211@...il.com>, linux-mm@...ck.org
Subject: Re: [PATCH 1/2] mm/vmalloc: Add a safer version of find_vm_area() for debug

Hi Christoph,

On Wed, Aug 30, 2023 at 8:48 AM Christoph Hellwig <hch@...radead.org> wrote:
>
> On Wed, Aug 30, 2023 at 11:03:59AM +0000, Joel Fernandes (Google) wrote:
> > It is unsafe to dump vmalloc area information when trying to do so from
> > some contexts. Add a safer trylock version of the same function to do a
> > best-effort VMA finding and use it from vmalloc_dump_obj().
>
> Seems like 2/2 to actually use this is missing?

1/2 itself uses it.

And then 2/2 is here which does additional improvement courtesy of Zqiang:
https://lore.kernel.org/all/20230830110402.386898-2-joel@joelfernandes.org/

I used git send-email with cc-cmd set to get_maintainer.pl script.

thanks,

 - Joel