linux-kernel - Re: [kernel] powerpc: Make vmalloc_to

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Message-Id: <20160125054603.5D55B140326@ozlabs.org>
Date:	Mon, 25 Jan 2016 16:46:03 +1100 (AEDT)
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Alexey Kardashevskiy <aik@...abs.ru>, linuxppc-dev@...ts.ozlabs.org
Cc:	Alexey Kardashevskiy <aik@...abs.ru>,
	Paul Mackerras <paulus@...ba.org>, linux-kernel@...r.kernel.org
Subject: Re: [kernel] powerpc: Make vmalloc_to_phys() public

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@...erman.id.au>

cheers