[kbuild-all] Re: [PATCH v4] mm: Uninline copy_overflow()

Le 12/02/2022 à 19:17, kernel test robot a écrit : > Hi Christophe, > > I love your patch! Yet something to improve: > > [auto build test ERROR on linux/master] > [also build test ERROR on linus/master v5.17-rc3] > [cannot apply to hnaz-mm/master next-20220211] > [If your patch is applied to the wrong git tree, kindly drop us a note. > And when submitting patch, we suggest to use '--base' as documented in > https://git-scm.com/docs/git-format-patch] > > url: https://github.com/0day-ci/linux/commits/Christophe-Leroy/mm-Uninline-cop... > base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 2c271fe77d52a0555161926c232cd5bc07178b39 > config: i386-allyesconfig (https://download.01.org/0day-ci/archive/20220213/202202130121.dZLDqfpe-lk...) > compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 > reproduce (this is a W=1 build): > # https://github.com/0day-ci/linux/commit/cf4474ac62f0332bd9d39f9dd74dbb5af... > git remote add linux-review https://github.com/0day-ci/linux > git fetch --no-tags linux-review Christophe-Leroy/mm-Uninline-copy_overflow/20220212-155040 > git checkout cf4474ac62f0332bd9d39f9dd74dbb5afce9a7a4 > # save the config file to linux build tree > mkdir build_dir > make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash > > If you fix the issue, kindly add following tag as appropriate > Reported-by: kernel test robot <lkp(a)intel.com&gt; > > All errors (new ones prefixed by >>): > > In file included from arch/x86/include/asm/preempt.h:7, > from include/linux/preempt.h:78, > from include/linux/percpu.h:6, > from include/linux/context_tracking_state.h:5, > from include/linux/hardirq.h:5, > from drivers/net/ethernet/mellanox/mlx4/cq.c:37: > In function 'check_copy_size', > inlined from 'copy_to_user' at include/linux/uaccess.h:199:6, > inlined from 'mlx4_init_user_cqes' at drivers/net/ethernet/mellanox/mlx4/cq.c:317:9, > inlined from 'mlx4_cq_alloc' at drivers/net/ethernet/mellanox/mlx4/cq.c:394:10: >>> include/linux/thread_info.h:228:4: error: call to '__bad_copy_from' declared with attribute error: copy source size is too small > 228 | __bad_copy_from(); > | ^~~~~~~~~~~~~~~~~ > This looks like a bug in GCC 9.x You get the exact same result without my patch when unselecting CONFIG_BUG You don't get the problem with gcc 8.5 You don't get the problem with gcc 10.3 My patch itself doesn't explain getting this error.