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Date:   Tue, 18 Oct 2022 11:17:37 -0700
From:   Christoph Hellwig <hch@infradead.org>
To:     Mike Snitzer <snitzer@kernel.org>
Cc:     Linus Torvalds <torvalds@linux-foundation.org>,
        dm-devel@redhat.com, linux-block@vger.kernel.org,
        Alasdair G Kergon <agk@redhat.com>,
        Genjian Zhang <zhanggenjian@kylinos.cn>,
        Jiangshan Yi <yijiangshan@kylinos.cn>,
        Jilin Yuan <yuanjilin@cdjrlc.com>,
        Mikulas Patocka <mpatocka@redhat.com>,
        Milan Broz <gmazyland@gmail.com>,
        Nathan Huckleberry <nhuck@google.com>,
        Nikos Tsironis <ntsironis@arrikto.com>,
        Shaomin Deng <dengshaomin@cdjrlc.com>
Subject: Re: [git pull] device mapper changes for 6.1
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On Tue, Oct 18, 2022 at 12:20:50PM -0400, Mike Snitzer wrote:
> 
> - Enhance DM ioctl interface to allow returning an error string to
>   userspace. Depends on exporting is_vmalloc_or_module_addr() to allow
>   DM core to conditionally free memory allocated with kasprintf().

That really does not sound like a good idea at all.  And it does not
seem to have any MM or core maintainer signoffs.