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V" , Anshuman Khandual , Paul Walmsley , Christian Borntraeger , catalin.marinas@arm.com, will@kernel.org, Andrew Morton , Mike Kravetz Subject: [PATCH 2/4] arm64/hugetlb: Implement arm64 specific hugetlb_mask_last_page Date: Thu, 16 Jun 2022 14:05:16 -0700 Message-Id: <20220616210518.125287-3-mike.kravetz@oracle.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20220616210518.125287-1-mike.kravetz@oracle.com> References: <20220616210518.125287-1-mike.kravetz@oracle.com> X-ClientProxiedBy: MW4PR03CA0237.namprd03.prod.outlook.com (2603:10b6:303:b9::32) 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: 24855748-effa-4322-bc1e-08da4fdbf177 X-MS-TrafficTypeDiagnostic: DS0PR10MB6197: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)(366004)(6486002)(38100700002)(6666004)(66946007)(7416002)(83380400001)(316002)(2906002)(66476007)(6506007)(4326008)(8676002)(54906003)(1076003)(498600001)(5660300002)(66556008)(86362001)(26005)(44832011)(36756003)(6512007)(966005)(2616005)(186003)(921005)(8936002)(107886003);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..ddeafee7c4de 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;