----- Original Message ----- > 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 > > I am bad with kconfig simplest fix from my pov is adding select MMU_NOTIFIER to HMM config as anyway anything that will have HMM will need notifier. config HMM bool + select MMU_NOTIFIER select MIGRATE_VMA_HELPER Cheers, Jérôme
