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([2602:fbf1:b002::1032]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2be4f96f25bsm5636535eec.28.2026.03.08.06.42.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 08 Mar 2026 06:42:29 -0700 (PDT) From: Jianhui Zhou To: sj@kernel.org Cc: aarcange@redhat.com, akpm@linux-foundation.org, david@kernel.org, jianhuizzzzz@gmail.com, jonaszhou@zhaoxin.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mike.kravetz@oracle.com, muchun.song@linux.dev, osalvador@suse.de, peterx@redhat.com, rppt@kernel.org, stable@vger.kernel.org, syzbot+f525fd79634858f478e7@syzkaller.appspotmail.com Subject: Re: [PATCH] mm/userfaultfd: fix hugetlb fault mutex hash calculation Date: Sun, 8 Mar 2026 21:41:51 +0800 Message-ID: <20260308134152.6877-1-jianhuizzzzz@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260307032759.100915-1-sj@kernel.org> References: <20260307032759.100915-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 30A621C0008 X-Stat-Signature: zofjpwtru5m66snt9cfo8z6cms88se5k X-Rspam-User: X-HE-Tag: 1772977350-413699 X-HE-Meta: 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 AxgtOw64 F0SlSiJJjRSOl1umPSdDL0Aqm+GGrF3hau2wvDDePRX0HfgPgPbknW0hE9myqTuiQK+GfklKtBuXJpQq49qwE2B1A+JBDjJr4l/G5SemRbgU6uge0o/WMZ30a6O0FcbzUepIvGmh9HG1Jdrg2Sn7ol0wD3A0VkrXyRPDolNFwTLOA6j985+CF0i8+aLpXfCCagRcDVbTCW/ppFpbXujtRnDlPKro9UzAvY5GAOR/w6+DZdOY1KVzMu/+Elk8xd1IfWuL22RV1I+5CRxt28B0qX63hnFLKU7/I31i7Q1CPzfnQgvS2YgXuUpGXUzRBl3ecnfU/kWaCvRUXS9jWbMztASn/r6lvAFyF8V40I/hYxkRxeymeB05nXVsDB9Q/b0e7Ujc1U+XLFg8zCpvheKgrEmfQ0Sq7jmxBqautvxnR3l7TPy5GiXep163TEVyPeXxN7xBif0f5TDL7xNcDQhdgbldkCJpXt8AE1qBz1lUEIbgyr2mey6+1nobBK5MMjBiUKpei86WirHv7VL5oXrhRPYoZnUtCS4m89ptG7x3/6dR6jyoWWZBI+ks+1cCsNUEHyqmu0HpYrv6DOOSBDfoWTzLR2eQVgnd6vf/63DGQtzS+wZD8/AbERO7SopgQO2uZFNLRPUQSq1AWpzA= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Mar 07, 2026 at 03:27:00AM +0000, SeongJae Park wrote: > I just found this patch makes UML build fails as below. > > ../include/linux/hugetlb.h:1214:16: error: implicit declaration of > function 'linear_page_index' [-Wimplicit-function-declaration] Thanks for catching this! As Peter pointed out, the !CONFIG_HUGETLB_PAGE stub is actually unnecessary since mfill_atomic_hugetlb() is only compiled when CONFIG_HUGETLB_PAGE is enabled. I have removed it in v2, which also fixes this build error.