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V" , Anshuman Khandual , Paul Walmsley , Christian Borntraeger , catalin.marinas@arm.com, will@kernel.org, Rolf Eike Beer , Andrew Morton , Mike Kravetz Subject: [PATCH v2 2/4] arm64/hugetlb: Implement arm64 specific hugetlb_mask_last_page Date: Tue, 21 Jun 2022 16:56:18 -0700 Message-Id: <20220621235620.291305-3-mike.kravetz@oracle.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20220621235620.291305-1-mike.kravetz@oracle.com> References: <20220621235620.291305-1-mike.kravetz@oracle.com> X-ClientProxiedBy: MW4PR03CA0298.namprd03.prod.outlook.com (2603:10b6:303:b5::33) To BY5PR10MB4196.namprd10.prod.outlook.com (2603:10b6:a03:20d::23) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: d3db7010-cb91-40f3-4755-08da53e1ab9c X-MS-TrafficTypeDiagnostic: MWHPR10MB1501:EE_ X-Microsoft-Antispam-PRVS: 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:BY5PR10MB4196.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230016)(376002)(346002)(366004)(136003)(39860400002)(396003)(7416002)(38100700002)(478600001)(316002)(6666004)(186003)(5660300002)(8936002)(2616005)(1076003)(107886003)(83380400001)(41300700001)(2906002)(86362001)(966005)(8676002)(66556008)(26005)(6512007)(66946007)(36756003)(66476007)(44832011)(6486002)(4326008)(54906003)(921005)(6506007);DIR:OUT;SFP:1101; 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So hugetlb_mask_last_page() is introduced to help to update the address in the loop of HugeTLB linear scanning with getting the last huge page mapped by the associated page table page[1], when a non-present entry is encountered. Considering ARM64 specific cont-pte/pmd size HugeTLB, this patch implemented an ARM64 specific hugetlb_mask_last_page() to help this case. [1] https://lore.kernel.org/linux-mm/20220527225849.284839-1-mike.kravetz@oracle.com/ Signed-off-by: Baolin Wang Signed-off-by: Mike Kravetz Acked-by: Muchun Song --- arch/arm64/mm/hugetlbpage.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c index e2a5ec9fdc0d..c9e076683e5d 100644 --- a/arch/arm64/mm/hugetlbpage.c +++ b/arch/arm64/mm/hugetlbpage.c @@ -368,6 +368,26 @@ pte_t *huge_pte_offset(struct mm_struct *mm, return NULL; } +unsigned long hugetlb_mask_last_page(struct hstate *h) +{ + unsigned long hp_size = huge_page_size(h); + + switch (hp_size) { + case PUD_SIZE: + return PGDIR_SIZE - PUD_SIZE; + case CONT_PMD_SIZE: + return PUD_SIZE - CONT_PMD_SIZE; + case PMD_SIZE: + return PUD_SIZE - PMD_SIZE; + case CONT_PTE_SIZE: + return PMD_SIZE - CONT_PTE_SIZE; + default: + break; + } + + return 0UL; +} + pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags) { size_t pagesize = 1UL << shift;