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McKenney" , Matthew Wilcox , Laurent Dufour , David Rientjes , Axel Rasmussen , Suren Baghdasaryan , Vlastimil Babka , Rik van Riel , Peter Zijlstra , Michel Lespinasse , Jerome Glisse , Minchan Kim , Joel Fernandes , Rom Lemarchand , Liam Howlett Subject: [PATCH v4 63/66] i915: Use the VMA iterator Thread-Topic: [PATCH v4 63/66] i915: Use the VMA iterator Thread-Index: AQHX5r/8pyGHA0a30UCeHYNaMLfKUw== Date: Wed, 1 Dec 2021 14:30:27 +0000 Message-ID: <20211201142918.921493-64-Liam.Howlett@oracle.com> References: <20211201142918.921493-1-Liam.Howlett@oracle.com> In-Reply-To: <20211201142918.921493-1-Liam.Howlett@oracle.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.30.2 x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 701570e3-55ee-4cec-d147-08d9b4d73a13 x-ms-traffictypediagnostic: SN6PR10MB2464: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:4714; x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; 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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: SN6PR10MB3022.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 701570e3-55ee-4cec-d147-08d9b4d73a13 X-MS-Exchange-CrossTenant-originalarrivaltime: 01 Dec 2021 14:30:27.3864 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: R+1rTepN9v7TxhHonys1mn8shs92jXyamT9SdEPgUPdQm9eGNyGaTpjCQysYiUnviYJN9PcyeeTPip7fipP/Dw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR10MB2464 X-Proofpoint-Virus-Version: vendor=nai engine=6300 definitions=10184 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 spamscore=0 adultscore=0 bulkscore=0 malwarescore=0 mlxlogscore=999 mlxscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2112010081 X-Proofpoint-ORIG-GUID: ks3z__2RwQQzphdUZkZSCbHDyqlsvWwJ X-Proofpoint-GUID: ks3z__2RwQQzphdUZkZSCbHDyqlsvWwJ Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Matthew Wilcox (Oracle)" Replace the O(n.log(n)) loop with an O(n) loop. Signed-off-by: Matthew Wilcox (Oracle) Signed-off-by: Liam R. Howlett --- drivers/gpu/drm/i915/gem/i915_gem_userptr.c | 14 +++++--------- 1 file changed, 5 insertions(+), 9 deletions(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c b/drivers/gpu/drm/= i915/gem/i915_gem_userptr.c index 3173c9f9a040..39960973c130 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c @@ -425,12 +425,11 @@ static const struct drm_i915_gem_object_ops i915_gem_= userptr_ops =3D { static int probe_range(struct mm_struct *mm, unsigned long addr, unsigned long len) { - const unsigned long end =3D addr + len; + VMA_ITERATOR(vmi, mm, addr); struct vm_area_struct *vma; - int ret =3D -EFAULT; =20 mmap_read_lock(mm); - for (vma =3D find_vma(mm, addr); vma; vma =3D vma->vm_next) { + for_each_vma_range(vmi, vma, addr + len) { /* Check for holes, note that we also update the addr below */ if (vma->vm_start > addr) break; @@ -438,16 +437,13 @@ probe_range(struct mm_struct *mm, unsigned long addr,= unsigned long len) if (vma->vm_flags & (VM_PFNMAP | VM_MIXEDMAP)) break; =20 - if (vma->vm_end >=3D end) { - ret =3D 0; - break; - } - addr =3D vma->vm_end; } mmap_read_unlock(mm); =20 - return ret; + if (vma) + return -EFAULT; + return 0; } =20 /* --=20 2.30.2