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Subject: Re: Is iounmap(NULL) safe or not?
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Alexey Khoroshilov <khoroshilov@ispras.ru>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org,
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Date: Sat, 06 May 2017 09:47:26 +0200
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On Sat, 2017-05-06 at 01:50 +0300, Alexey Khoroshilov wrote:
> Could you please clarify if iounmap(NULL) safe or not.
> I guess it would be less errorprone if the answer is architecture independent.

I think it's supposed to be and we should fix ppc.

Cheers,
Ben.