Hi Michel, Thank you for the patch! Yet something to improve: [auto build test ERROR on rdma/for-next] [also build test ERROR on linus/master v5.6-rc7] [cannot apply to powerpc/next next-20200326] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Michel-Lespinasse/Add-a-new-mmap-locking-API-wrapping-mmap_sem-calls/20200327-035215 base: https://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma.git for-next config: i386-randconfig-a002-20200326 (attached as .config) compiler: gcc-4.9 (Ubuntu 4.9.3-13ubuntu2) 4.9.3 reproduce: # save the attached .config to linux build tree make ARCH=i386 If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): drivers/dma-buf/dma-resv.c: In function 'dma_resv_lockdep': >> drivers/dma-buf/dma-resv.c:112:2: error: implicit declaration of function 'mmap_read_lock' [-Werror=implicit-function-declaration] mmap_read_lock(mm); ^ >> drivers/dma-buf/dma-resv.c:121:2: error: implicit declaration of function 'mmap_read_unlock' [-Werror=implicit-function-declaration] mmap_read_unlock(mm); ^ cc1: some warnings being treated as errors vim +/mmap_read_lock +112 drivers/dma-buf/dma-resv.c 98 99 #if IS_ENABLED(CONFIG_LOCKDEP) 100 static int __init dma_resv_lockdep(void) 101 { 102 struct mm_struct *mm = mm_alloc(); 103 struct ww_acquire_ctx ctx; 104 struct dma_resv obj; 105 int ret; 106 107 if (!mm) 108 return -ENOMEM; 109 110 dma_resv_init(&obj); 111 > 112 mmap_read_lock(mm); 113 ww_acquire_init(&ctx, &reservation_ww_class); 114 ret = dma_resv_lock(&obj, &ctx); 115 if (ret == -EDEADLK) 116 dma_resv_lock_slow(&obj, &ctx); 117 fs_reclaim_acquire(GFP_KERNEL); 118 fs_reclaim_release(GFP_KERNEL); 119 ww_mutex_unlock(&obj.lock); 120 ww_acquire_fini(&ctx); > 121 mmap_read_unlock(mm); 122 123 mmput(mm); 124 125 return 0; 126 } 127 subsys_initcall(dma_resv_lockdep); 128 #endif 129 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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