linux-kernel - Re: [PATCH 2/4] powerpc: Prepare to support kernel handling of IOMMU map/unmap

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Date:	Sun, 16 Jun 2013 14:31:20 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Alexey Kardashevskiy <aik@...abs.ru>
Cc:	linuxppc-dev@...ts.ozlabs.org,
	David Gibson <david@...son.dropbear.id.au>,
	Alexander Graf <agraf@...e.de>,
	Paul Mackerras <paulus@...ba.org>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, kvm-ppc@...r.kernel.org,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH 2/4] powerpc: Prepare to support kernel handling of
 IOMMU map/unmap

On Sun, 2013-06-16 at 14:26 +1000, Benjamin Herrenschmidt wrote:
> > +int realmode_get_page(struct page *page)
> > +{
> > +     if (PageCompound(page))
> > +             return -EAGAIN;
> > +
> > +     get_page(page);
> > +
> > +     return 0;
> > +}

Shouldn't it be get_page_unless_zero ?

Cheers,
Ben.

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