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From: David Hildenbrand <david@redhat.com>
To: linux-kernel@vger.kernel.org
Subject: [PATCH v1 07/10] powerpc/mm: Prepare maybe_pte_to_page() for
 PG_reserved changes
Date: Thu, 24 Oct 2019 14:09:35 +0200
Message-Id: <20191024120938.11237-8-david@redhat.com>
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Cc: linux-hyperv@vger.kernel.org, Michal Hocko <mhocko@suse.com>,
 =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= <rkrcmar@redhat.com>,
 kvm@vger.kernel.org, David Hildenbrand <david@redhat.com>,
 KarimAllah Ahmed <karahmed@amazon.de>,
 Dave Hansen <dave.hansen@linux.intel.com>,
 Alexander Duyck <alexander.duyck@gmail.com>, Michal Hocko <mhocko@kernel.org>,
 linux-mm@kvack.org, Pavel Tatashin <pavel.tatashin@microsoft.com>,
 Paul Mackerras <paulus@samba.org>, "H. Peter Anvin" <hpa@zytor.com>,
 Wanpeng Li <wanpengli@tencent.com>,
 Alexander Duyck <alexander.h.duyck@linux.intel.com>,
 "K. Y. Srinivasan" <kys@microsoft.com>,
 Dan Williams <dan.j.williams@intel.com>, Kees Cook <keescook@chromium.org>,
 devel@driverdev.osuosl.org, Stefano Stabellini <sstabellini@kernel.org>,
 Stephen Hemminger <sthemmin@microsoft.com>,
 "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
 Joerg Roedel <joro@8bytes.org>, x86@kernel.org,
 YueHaibing <yuehaibing@huawei.com>,
 "Matthew Wilcox \(Oracle\)" <willy@infradead.org>,
 Mike Rapoport <rppt@linux.ibm.com>, Peter Zijlstra <peterz@infradead.org>,
 Ingo Molnar <mingo@redhat.com>, Vlastimil Babka <vbabka@suse.cz>,
 Anthony Yznaga <anthony.yznaga@oracle.com>, Oscar Salvador <osalvador@suse.de>,
 "Isaac J. Manjarres" <isaacm@codeaurora.org>,
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 Anshuman Khandual <anshuman.khandual@arm.com>,
 Haiyang Zhang <haiyangz@microsoft.com>, Sasha Levin <sashal@kernel.org>,
 kvm-ppc@vger.kernel.org, Qian Cai <cai@lca.pw>,
 Alex Williamson <alex.williamson@redhat.com>,
 Mike Rapoport <rppt@linux.vnet.ibm.com>, Borislav Petkov <bp@alien8.de>,
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 linuxppc-dev@lists.ozlabs.org
Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org
Sender: "Linuxppc-dev"
 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

Right now, ZONE_DEVICE memory is always set PG_reserved. We want to
change that.

Rewrite maybe_pte_to_page() to make sure the function produces the
same result once we stop setting ZONE_DEVICE pages PG_reserved.

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Christophe Leroy <christophe.leroy@c-s.fr>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Cc: Allison Randal <allison@lohutok.net>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
 arch/powerpc/mm/pgtable.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c
index e3759b69f81b..613c98fa7dc0 100644
--- a/arch/powerpc/mm/pgtable.c
+++ b/arch/powerpc/mm/pgtable.c
@@ -55,10 +55,12 @@ static struct page *maybe_pte_to_page(pte_t pte)
 =09unsigned long pfn =3D pte_pfn(pte);
 =09struct page *page;
=20
-=09if (unlikely(!pfn_valid(pfn)))
-=09=09return NULL;
-=09page =3D pfn_to_page(pfn);
-=09if (PageReserved(page))
+=09/*
+=09 * We reject any pages that are not online (not managed by the buddy).
+=09 * This includes ZONE_DEVICE pages.
+=09 */
+=09page =3D pfn_to_online_page(pfn);
+=09if (unlikely(!page || PageReserved(page)))
 =09=09return NULL;
 =09return page;
 }
--=20
2.21.0