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Tue, 30 Jul 2019 17:39:50 +0000 Received: from VI1PR05MB4141.eurprd05.prod.outlook.com ([fe80::5c6f:6120:45cd:2880]) by VI1PR05MB4141.eurprd05.prod.outlook.com ([fe80::5c6f:6120:45cd:2880%4]) with mapi id 15.20.2115.005; Tue, 30 Jul 2019 17:39:50 +0000 From: Jason Gunthorpe To: Christoph Hellwig CC: =?iso-8859-1?Q?J=E9r=F4me_Glisse?= , Ben Skeggs , Felix Kuehling , Ralph Campbell , "linux-mm@kvack.org" , "nouveau@lists.freedesktop.org" , "dri-devel@lists.freedesktop.org" , "amd-gfx@lists.freedesktop.org" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH 08/13] mm: remove the mask variable in hmm_vma_walk_hugetlb_entry Thread-Topic: [PATCH 08/13] mm: remove the mask variable in hmm_vma_walk_hugetlb_entry Thread-Index: AQHVRpsBxp87/2vfUUuxY9sZD/Qj2KbjblgA Date: Tue, 30 Jul 2019 17:39:50 +0000 Message-ID: <20190730173946.GK24038@mellanox.com> References: <20190730055203.28467-1-hch@lst.de> <20190730055203.28467-9-hch@lst.de> In-Reply-To: <20190730055203.28467-9-hch@lst.de> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: YT1PR01CA0018.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01::31) To VI1PR05MB4141.eurprd05.prod.outlook.com (2603:10a6:803:4d::16) authentication-results: spf=none (sender IP is ) smtp.mailfrom=jgg@mellanox.com; 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received-spf: None (protection.outlook.com: mellanox.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: xrKcYjxImGp5ANkno0SF7XbwaEl1a2Sx59Jxb3fuxL2Ez23xcyxr5pE7Y3cszYtaFenI4emzitTF/fwwTOXYNfSB7oY2fhDCe81QbgRzb0gBWiS8e9TwMd55bnuWYrNvnMjO2fnYbHwhaQgHeC9f0PW2muzlao6GI0YHNRaHpwqJ+Zm1o7xTulYAbFWony+Ku0hZK4RZIpEygPBIYTTGZihg0zunfTpbPgheZVz+qTZVbGkEZC64prBfqHxxG0OIelI94+MN84YG1A/YfliJEgyvq27Gzf0aM+sIV7GIKlS0a9DEK7feOwT+9GHxFxC2sS/SyhxlcPt55H1twIWEcEolrzKABbXfKBLpKlC188z0kK0NNKSbctUg/k06DBWJnfKeDy3BFPO9aODv3K7736kn96DJa/JsirhSVt1BPTY= Content-Type: text/plain; charset="iso-8859-1" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: Mellanox.com X-MS-Exchange-CrossTenant-Network-Message-Id: a618e036-983c-4381-ded6-08d71514ec54 X-MS-Exchange-CrossTenant-originalarrivaltime: 30 Jul 2019 17:39:50.6817 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: a652971c-7d2e-4d9b-a6a4-d149256f461b X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: jgg@mellanox.com X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR05MB6829 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, Jul 30, 2019 at 08:51:58AM +0300, Christoph Hellwig wrote: > The pagewalk code already passes the value as the hmask parameter. >=20 > Signed-off-by: Christoph Hellwig > mm/hmm.c | 7 ++----- > 1 file changed, 2 insertions(+), 5 deletions(-) >=20 > diff --git a/mm/hmm.c b/mm/hmm.c > index f26d6abc4ed2..88b77a4a6a1e 100644 > +++ b/mm/hmm.c > @@ -771,19 +771,16 @@ static int hmm_vma_walk_hugetlb_entry(pte_t *pte, u= nsigned long hmask, > struct mm_walk *walk) > { > #ifdef CONFIG_HUGETLB_PAGE > - unsigned long addr =3D start, i, pfn, mask; > + unsigned long addr =3D start, i, pfn; > struct hmm_vma_walk *hmm_vma_walk =3D walk->private; > struct hmm_range *range =3D hmm_vma_walk->range; > struct vm_area_struct *vma =3D walk->vma; > - struct hstate *h =3D hstate_vma(vma); > uint64_t orig_pfn, cpu_flags; > bool fault, write_fault; > spinlock_t *ptl; > pte_t entry; > int ret =3D 0; > =20 > - mask =3D huge_page_size(h) - 1; > - > ptl =3D huge_pte_lock(hstate_vma(vma), walk->mm, pte); > entry =3D huge_ptep_get(pte); > =20 > @@ -799,7 +796,7 @@ static int hmm_vma_walk_hugetlb_entry(pte_t *pte, uns= igned long hmask, > goto unlock; > } > =20 > - pfn =3D pte_pfn(entry) + ((start & mask) >> PAGE_SHIFT); > + pfn =3D pte_pfn(entry) + ((start & hmask) >> PAGE_SHIFT); I don't know this hstate stuff, but this doesn't look the same? static int walk_hugetlb_range(unsigned long addr, unsigned long end, { struct hstate *h =3D hstate_vma(vma); unsigned long hmask =3D huge_page_mask(h); // aka h->mask err =3D walk->hugetlb_entry(pte, hmask, addr, next,= walk); And the first place I found setting h->mask is: void __init hugetlb_add_hstate(unsigned int order) { h->mask =3D ~((1ULL << (order + PAGE_SHIFT)) - 1); Compared with mask =3D huge_page_size(h) - 1; =3D ((unsigned long)PAGE_SIZE << h->order) - 1 Looks like hmask =3D=3D ~mask ? Jason