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Howlett" To: Andrew Morton Cc: maple-tree@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Liam R. Howlett" , Peng Zhang Subject: [PATCH v4 32/35] maple_tree: Clear up index and last setting in single entry tree Date: Thu, 18 May 2023 10:55:41 -0400 Message-Id: <20230518145544.1722059-33-Liam.Howlett@oracle.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230518145544.1722059-1-Liam.Howlett@oracle.com> References: <20230518145544.1722059-1-Liam.Howlett@oracle.com> X-ClientProxiedBy: YT4PR01CA0131.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:d5::28) To SN6PR10MB3022.namprd10.prod.outlook.com (2603:10b6:805:d8::25) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN6PR10MB3022:EE_|IA1PR10MB7261:EE_ X-MS-Office365-Filtering-Correlation-Id: 0ab5f90d-1f66-4183-a940-08db57b0274d 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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EiDO8F1BfADXs2WrYtivcwcuKBOGsMWaLTVRVWG5MYbD6dzE+set/s909qJyVVIMedRpJgvkGP8G356eXww9l7lHRvrS6sYmi0vlzhO8981Ka4RB2TBDGGvTmHJPAJLEeBtArBtpyLB0pXF2UW4USLAQn0UlVHl2/EYj+uo3aUL8ZekTKtnFvatTvebIThGiSuChJa2lRu2V+3iIypL+RBVtMMNZk44OxDTG9Q+od3/ohfk3qPT/Zq1HrGO9yRrPyH5ozCIaNF66M94cjvNj8B7frtGPcRflu+Fpz7cf3vMqkkTHoVjTRtzUuYIwlx78st8unCz2whn3Z2eAS72cHBNws9O88+JnKmbCozoPRzkDMB3HLx9Ur7VNyICZzCzUaC+LpQp1jqedLkMMiz281s0s89lqxPcgGik2vp8FbgcYy0Pde324R372q6rzWjthe6kp4dlqXW1DsEJrp5d1sH+0p9ORov5oVztbO X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: When there is a single entry tree (range of 0-0 pointing to an entry), then ensure the limit is either 0-0 or 1-oo, depending on where the user walks. Ensure the correct node setting as well; either MAS_ROOT or MAS_NONE. Cc: Peng Zhang Signed-off-by: Liam R. Howlett --- lib/maple_tree.c | 21 +++++++++++---------- 1 file changed, 11 insertions(+), 10 deletions(-) diff --git a/lib/maple_tree.c b/lib/maple_tree.c index fe481d4e5e6a..1e70a1b0c6f0 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -5022,24 +5022,25 @@ void *mas_walk(struct ma_state *mas) { void *entry; + if (mas_is_none(mas) || mas_is_paused(mas) || mas_is_ptr(mas)) + mas->node = MAS_START; retry: entry = mas_state_walk(mas); - if (mas_is_start(mas)) + if (mas_is_start(mas)) { goto retry; - - if (mas_is_ptr(mas)) { + } else if (mas_is_none(mas)) { + mas->index = 0; + mas->last = ULONG_MAX; + } else if (mas_is_ptr(mas)) { if (!mas->index) { mas->last = 0; - } else { - mas->index = 1; - mas->last = ULONG_MAX; + return entry; } - return entry; - } - if (mas_is_none(mas)) { - mas->index = 0; + mas->index = 1; mas->last = ULONG_MAX; + mas->node = MAS_NONE; + return NULL; } return entry;