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To: Alexey Kardashevskiy <aik@ozlabs.ru>, linuxppc-dev@lists.ozlabs.org
From: Michael Ellerman <mpe@ellerman.id.au>
Cc: Alexey Kardashevskiy <aik@ozlabs.ru>, Paul Mackerras <paulus@samba.org>,
 linux-kernel@vger.kernel.org
Subject: Re: [kernel] powerpc: Make vmalloc_to_phys() public
Message-Id: <20160125054603.5D55B140326@ozlabs.org>
Date: Mon, 25 Jan 2016 16:46:03 +1100 (AEDT)
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On Thu, 2016-21-01 at 07:35:08 UTC, Alexey Kardashevskiy wrote:
> This makes vmalloc_to_phys() public as there will be another user
> (in-kernel VFIO acceleration) for it soon.
> 
> As a part of future little optimization, this changes the helper to call
> vmalloc_to_pfn() instead of vmalloc_to_page() as the size of the
> struct page may not be power-of-two aligned which will make gcc use
> multiply instructions instead of shifts.

You should also mention why you need to export it, presumably because whatever
new user you have in mind can be built as a module.

Acked-by: Michael Ellerman <mpe@ellerman.id.au>

cheers