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Howlett" <Liam.Howlett@oracle.com> To: Andrew Morton <akpm@linux-foundation.org> Cc: maple-tree@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Peng Zhang <zhangpeng.00@bytedance.com>, "Liam R. Howlett" <Liam.Howlett@oracle.com> Subject: [PATCH v2 05/16] mm: Remove prev check from do_vmi_align_munmap() Date: Mon, 12 Jun 2023 16:39:42 -0400 Message-Id: <20230612203953.2093911-6-Liam.Howlett@oracle.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230612203953.2093911-1-Liam.Howlett@oracle.com> References: <20230612203953.2093911-1-Liam.Howlett@oracle.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: YT4PR01CA0100.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:d7::21) To SN6PR10MB3022.namprd10.prod.outlook.com (2603:10b6:805:d8::25) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN6PR10MB3022:EE_|SA1PR10MB5868:EE_ X-MS-Office365-Filtering-Correlation-Id: 2f433b13-a517-48c2-50e4-08db6b853805 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:SN6PR10MB3022.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230028)(366004)(346002)(39860400002)(136003)(396003)(376002)(451199021)(8936002)(8676002)(5660300002)(4326008)(6916009)(66946007)(66476007)(66556008)(316002)(54906003)(2906002)(41300700001)(4744005)(6666004)(478600001)(6486002)(6506007)(26005)(1076003)(107886003)(6512007)(83380400001)(186003)(36756003)(2616005)(86362001)(38100700002);DIR:OUT;SFP:1101; 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Series |
Reduce preallocations for maple tree
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Commit Message
Liam R. Howlett
June 12, 2023, 8:39 p.m. UTC
If the prev does not exist, the vma iterator will be set to MAS_NONE,
which will be treated as a MAS_START when the mas_next or mas_find is
used. In this case, the next caller will be the vma iterator, which
uses mas_find() under the hood and will now do what the user expects.
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
---
mm/mmap.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/mm/mmap.c b/mm/mmap.c index 8e5563668b18..fd3f505b40cc 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2402,8 +2402,6 @@ do_vmi_align_munmap(struct vma_iterator *vmi, struct vm_area_struct *vma, } prev = vma_prev(vmi); - if (unlikely((!prev))) - vma_iter_set(vmi, start); /* * Detach a range of VMAs from the mm. Using next as a temp variable as