From: Paul Mackerras <paulus@ozlabs.org>
To: Michael Ellerman <mpe@ellerman.id.au>
Cc: Alexey Kardashevskiy <aik@ozlabs.ru>,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: [kernel] powerpc: Make vmalloc_to_phys() public
Date: Mon, 25 Jan 2016 21:06:09 +1100 [thread overview]
Message-ID: <20160125100609.GA24295@fergus.ozlabs.ibm.com> (raw)
In-Reply-To: <20160125054603.5D55B140326@ozlabs.org>
On Mon, Jan 25, 2016 at 04:46:03PM +1100, Michael Ellerman wrote:
> 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.
If I remember correctly, it's the *existing* user in hv-24x7.c that
needs the export.
Paul.
next prev parent reply other threads:[~2016-01-25 10:06 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-21 7:35 [PATCH kernel] powerpc: Make vmalloc_to_phys() public Alexey Kardashevskiy
2016-01-25 5:46 ` [kernel] " Michael Ellerman
2016-01-25 6:21 ` Anshuman Khandual
2016-01-25 10:06 ` Paul Mackerras [this message]
2016-01-27 3:19 ` Alexey Kardashevskiy
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