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[14.202.194.140]) by smtp.gmail.com with ESMTPSA id 62sm9180955pgc.61.2019.02.01.14.48.12 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 01 Feb 2019 14:48:13 -0800 (PST) Date: Sat, 2 Feb 2019 09:48:09 +1100 From: Balbir Singh To: kbuild test robot Cc: =?iso-8859-1?B?Suly9G1l?= Glisse , kbuild-all@01.org, Andrew Morton , Linux Memory Management List Subject: Re: [linux-next:master 5141/5361] include/linux/hmm.h:102:22: error: field 'mmu_notifier' has incomplete type Message-ID: <20190201224809.GK26056@350D> References: <201902020011.aV3IBiMH%fengguang.wu@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <201902020011.aV3IBiMH%fengguang.wu@intel.com> User-Agent: Mutt/1.9.4 (2018-02-28) 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: On Sat, Feb 02, 2019 at 12:14:13AM +0800, kbuild test robot wrote: > tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master > head: 9fe36dd579c794ae5f1c236293c55fb6847e9654 > commit: a3402cb621c1b3908600d3f364e991a6c5a8c06e [5141/5361] mm/hmm: improve driver API to work and wait over a range > config: x86_64-randconfig-b0-02012138 (attached as .config) > compiler: gcc-8 (Debian 8.2.0-14) 8.2.0 > reproduce: > git checkout a3402cb621c1b3908600d3f364e991a6c5a8c06e > # save the attached .config to linux build tree > make ARCH=x86_64 > > All errors (new ones prefixed by >>): > > In file included from kernel/memremap.c:14: > >> include/linux/hmm.h:102:22: error: field 'mmu_notifier' has incomplete type > struct mmu_notifier mmu_notifier; > ^~~~~~~~~~~~ > > vim +/mmu_notifier +102 include/linux/hmm.h > > 81 > 82 > 83 /* > 84 * struct hmm - HMM per mm struct > 85 * > 86 * @mm: mm struct this HMM struct is bound to > 87 * @lock: lock protecting ranges list > 88 * @ranges: list of range being snapshotted > 89 * @mirrors: list of mirrors for this mm > 90 * @mmu_notifier: mmu notifier to track updates to CPU page table > 91 * @mirrors_sem: read/write semaphore protecting the mirrors list > 92 * @wq: wait queue for user waiting on a range invalidation > 93 * @notifiers: count of active mmu notifiers > 94 * @dead: is the mm dead ? > 95 */ > 96 struct hmm { > 97 struct mm_struct *mm; > 98 struct kref kref; > 99 struct mutex lock; > 100 struct list_head ranges; > 101 struct list_head mirrors; > > 102 struct mmu_notifier mmu_notifier; Only HMM_MIRROR depends on MMU_NOTIFIER, but mmu_notifier in the hmm struct is not conditionally dependent HMM_MIRROR. The shared config has HMM_MIRROR disabled Balbir