Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Liam Howlett <liam.howlett@oracle.com>
To:     "maple-tree@lists.infradead.org" <maple-tree@lists.infradead.org>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>
CC:     Song Liu <songliubraving@fb.com>,
        Davidlohr Bueso <dave@stgolabs.net>,
        "Paul E . McKenney" <paulmck@kernel.org>,
        Matthew Wilcox <willy@infradead.org>,
        Laurent Dufour <ldufour@linux.ibm.com>,
        David Rientjes <rientjes@google.com>,
        Axel Rasmussen <axelrasmussen@google.com>,
        Suren Baghdasaryan <surenb@google.com>,
        Vlastimil Babka <vbabka@suse.cz>,
        Rik van Riel <riel@surriel.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Michel Lespinasse <walken.cr@gmail.com>,
        Liam Howlett <liam.howlett@oracle.com>
Subject: [PATCH 28/94] mm/mmap: Introduce unlock_range() for code cleanup
Thread-Topic: [PATCH 28/94] mm/mmap: Introduce unlock_range() for code cleanup
Thread-Index: AQHXPEQyXaQ8zSclo0e9BgEBMd1PgQ==
Date:   Wed, 28 Apr 2021 15:36:03 +0000
Message-ID: <20210428153542.2814175-29-Liam.Howlett@Oracle.com>
References: <20210428153542.2814175-1-Liam.Howlett@Oracle.com>
In-Reply-To: <20210428153542.2814175-1-Liam.Howlett@Oracle.com>
Accept-Language: en-US
Content-Language: en-US
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
X-MS-Exchange-CrossTenant-Network-Message-Id: 66e6f176-843d-43f3-713f-08d90a5b55d7
X-MS-Exchange-CrossTenant-originalarrivaltime: 28 Apr 2021 15:36:03.8934
 (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: KpdiB6iL/rE73WwqnjjTyqgaOSzspl4c3vFDX7aLmz6Fqdo6xQxz8MhrraSBrhkrLAlfRf+mOSnidxWYcOsd9A==
X-MS-Exchange-Transport-CrossTenantHeadersStamped: CO1PR10MB4769
X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9968 signatures=668683
X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 malwarescore=0 mlxscore=0
 mlxlogscore=999 bulkscore=0 phishscore=0 spamscore=0 suspectscore=0
 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104060000
 definitions=main-2104280101
X-Proofpoint-GUID: EgiI-pJx26HDgTlCQCYRQOieaNvHUAO8
X-Proofpoint-ORIG-GUID: EgiI-pJx26HDgTlCQCYRQOieaNvHUAO8
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
---
 mm/mmap.c | 37 ++++++++++++++++++-------------------
 1 file changed, 18 insertions(+), 19 deletions(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index bce25db96fd1..112be171b662 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2992,6 +2992,20 @@ int split_vma(struct mm_struct *mm, struct vm_area_s=
truct *vma,
 	return __split_vma(mm, vma, addr, new_below);
 }
=20
+static inline void unlock_range(struct vm_area_struct *start, unsigned lon=
g limit)
+{
+	struct mm_struct *mm =3D start->vm_mm;
+	struct vm_area_struct *tmp =3D start;
+
+	while (tmp && tmp->vm_start < limit) {
+		if (tmp->vm_flags & VM_LOCKED) {
+			mm->locked_vm -=3D vma_pages(tmp);
+			munlock_vma_pages_all(tmp);
+		}
+
+		tmp =3D tmp->vm_next;
+	}
+}
 /* Munmap is split into 2 main parts -- this part which finds
  * what needs doing, and the areas themselves, which do the
  * work.  This now handles partial unmappings.
@@ -3080,17 +3094,8 @@ int __do_munmap(struct mm_struct *mm, unsigned long =
start, size_t len,
 	/*
 	 * unlock any mlock()ed ranges before detaching vmas
 	 */
-	if (mm->locked_vm) {
-		struct vm_area_struct *tmp =3D vma;
-		while (tmp && tmp->vm_start < end) {
-			if (tmp->vm_flags & VM_LOCKED) {
-				mm->locked_vm -=3D vma_pages(tmp);
-				munlock_vma_pages_all(tmp);
-			}
-
-			tmp =3D tmp->vm_next;
-		}
-	}
+	if (mm->locked_vm)
+		unlock_range(vma, end);
=20
 	/* Detach vmas from rbtree */
 	if (!detach_vmas_to_be_unmapped(mm, vma, prev, end))
@@ -3377,14 +3382,8 @@ void exit_mmap(struct mm_struct *mm)
 		mmap_write_unlock(mm);
 	}
=20
-	if (mm->locked_vm) {
-		vma =3D mm->mmap;
-		while (vma) {
-			if (vma->vm_flags & VM_LOCKED)
-				munlock_vma_pages_all(vma);
-			vma =3D vma->vm_next;
-		}
-	}
+	if (mm->locked_vm)
+		unlock_range(mm->mmap, ULONG_MAX);
=20
 	arch_exit_mmap(mm);
=20
--=20
2.30.2