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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> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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.