linux-kernel - Re: [kernel,v2] powerpc/iommu: Do not call PageTransHuge() on tail pages

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Message-Id: <3w7bcz5ZT4z9s7k@ozlabs.org>
Date:   Thu, 20 Apr 2017 08:04:19 +1000 (AEST)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Alexey Kardashevskiy <aik@...abs.ru>, linuxppc-dev@...ts.ozlabs.org
Cc:     v4.9+@...abs.ru, Alexey Kardashevskiy <aik@...abs.ru>,
        Greg Kurz <groug@...d.org>, stable@...r.kernel.org,
        linux-kernel@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.vnet.ibm.com>, #@...abs.ru
Subject: Re: [kernel,v2] powerpc/iommu: Do not call PageTransHuge() on tail pages

On Tue, 2017-04-11 at 07:54:57 UTC, Alexey Kardashevskiy wrote:
> The CMA pages migration code does not support compound pages at
> the moment so it performs few tests before proceeding to actual page
> migration.
> 
> One of the tests - PageTransHuge() - has VM_BUG_ON_PAGE(PageTail()) as
> it is designed to be called on head pages only. Since we also test for
> PageCompound(), and it contains PageTail() and PageHead(), we can
> simplify the check by leaving just PageCompound() and therefore avoid
> possible VM_BUG_ON_PAGE.
> 
> Fixes: 2e5bbb5461f1 ("KVM: PPC: Book3S HV: Migrate pinned pages out of CMA")
> Cc: stable@...r.kernel.org # v4.9+
> Signed-off-by: Alexey Kardashevskiy <aik@...abs.ru>
> Acked-by: Balbir Singh <bsingharora@...il.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/e889e96e98e8da97bd39e46b725361

cheers