From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mike Snitzer <snitzer@redhat.com>
Subject: Re: dm: ioctl: use kvfree
Date: Mon, 11 Apr 2016 11:17:15 -0400
Message-ID: <20160411151714.GB25938@redhat.com>
References: <1460387677-19948-1-git-send-email-sudipm.mukherjee@gmail.com>
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To: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Cc: Alasdair Kergon <agk@redhat.com>, Shaohua Li <shli@kernel.org>, linux-kernel@vger.kernel.org, dm-devel@redhat.com, linux-raid@vger.kernel.org
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On Mon, Apr 11 2016 at 11:14am -0400,
Sudip Mukherjee <sudipm.mukherjee@gmail.com> wrote:

> We can use kvfree() instead of calling kfree() and vfree() based on
> if-else and param_flags. kvfree() will check the type of address and
> will call the respective function to free it.
> Additionally we can also remove the use of DM_PARAMS_KMALLOC and
> DM_PARAMS_VMALLOC.
> 
> Signed-off-by: Sudip Mukherjee <sudip.mukherjee@codethink.co.uk>

Have you actually tested htis?  Last time I looked to do this it exposed
crashes.  I don't have time to dig into this again right now but this is
_not_ as simple as this patch implies.