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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, Suren Baghdasaryan <surenb@google.com>, "Liam R. Howlett" <Liam.Howlett@oracle.com> Subject: [PATCH v3 04/15] mm: Remove prev check from do_vmi_align_munmap() Date: Mon, 24 Jul 2023 14:31:46 -0400 Message-Id: <20230724183157.3939892-5-Liam.Howlett@oracle.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230724183157.3939892-1-Liam.Howlett@oracle.com> References: <20230724183157.3939892-1-Liam.Howlett@oracle.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: YT3PR01CA0036.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:82::35) To SN6PR10MB3022.namprd10.prod.outlook.com (2603:10b6:805:d8::25) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN6PR10MB3022:EE_|DS7PR10MB5376:EE_ X-MS-Office365-Filtering-Correlation-Id: 189598c9-01b3-4e06-af34-08db8c74553b 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)(346002)(39860400002)(136003)(376002)(366004)(396003)(451199021)(6506007)(26005)(1076003)(186003)(36756003)(5660300002)(8936002)(8676002)(4744005)(2906002)(38100700002)(107886003)(86362001)(6666004)(6486002)(66476007)(66556008)(6512007)(66946007)(83380400001)(54906003)(478600001)(41300700001)(2616005)(4326008)(6916009)(316002);DIR:OUT;SFP:1101; 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Series |
Reduce preallocations for maple tree
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Commit Message
Liam R. Howlett
July 24, 2023, 6:31 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 fa388eab8074..d4056d1de7fa 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2458,8 +2458,6 @@ 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