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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 27/66] mm/mmap: Change do_brk_munmap() to use do_mas_align_munmap() Thread-Topic: [PATCH v4 27/66] mm/mmap: Change do_brk_munmap() to use do_mas_align_munmap() Thread-Index: AQHX5r/usRUxQs+IyEmLitRRgBJ0VA== Date: Wed, 1 Dec 2021 14:30:03 +0000 Message-ID: <20211201142918.921493-28-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: 4c09355e-6ef0-4a8e-7886-08d9b4d71092 x-ms-traffictypediagnostic: SN6PR10MB3021: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:241; 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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: 4c09355e-6ef0-4a8e-7886-08d9b4d71092 X-MS-Exchange-CrossTenant-originalarrivaltime: 01 Dec 2021 14:30:03.7359 (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: xu9N4I+HUz+b+LrIdsunBfiMGF+r8KyyzXZA5Bj6Sp1egAbtGeP4RXHjuy0s/U3B7ejOIw3elZQxyuz7RyC0qw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR10MB3021 X-Proofpoint-Virus-Version: vendor=nai engine=6300 definitions=10184 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 mlxlogscore=999 phishscore=0 suspectscore=0 spamscore=0 adultscore=0 mlxscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2112010081 X-Proofpoint-ORIG-GUID: fGurPw56lXWHd45nxNAj_jLHb350MmrY X-Proofpoint-GUID: fGurPw56lXWHd45nxNAj_jLHb350MmrY Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Liam R. Howlett" do_brk_munmap() has already aligned the address and has a maple tree state to be used. Use the new do_mas_align_munmap() to avoid unnecessary alignment and error checks. Signed-off-by: Liam R. Howlett --- mm/mmap.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/mm/mmap.c b/mm/mmap.c index 14190306a483..79b8494d83c6 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2926,12 +2926,15 @@ static int do_brk_munmap(struct ma_state *mas, stru= ct vm_area_struct *vma, struct mm_struct *mm =3D vma->vm_mm; struct vm_area_struct unmap; unsigned long unmap_pages; - int ret =3D 1; + int ret; =20 arch_unmap(mm, newbrk, oldbrk); =20 - if (likely(vma->vm_start >=3D newbrk)) { // remove entire mapping(s) - ret =3D do_mas_munmap(mas, mm, newbrk, oldbrk-newbrk, uf, true); + if (likely((vma->vm_end < oldbrk) || + ((vma->vm_start =3D=3D newbrk) && (vma->vm_end =3D=3D oldbrk)))) { + // remove entire mapping(s) + ret =3D do_mas_align_munmap(mas, vma, mm, newbrk, oldbrk, uf, + true); goto munmap_full_vma; } =20 --=20 2.30.2