Hi Babis, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on char-misc/char-misc-testing] [also build test WARNING on char-misc/char-misc-next char-misc/char-misc-linus linus/master v6.2-rc4 next-20230119] [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#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Babis-Chalios/virtio-rng-implement-entropy-leak-feature/20230120-024631 patch link: https://lore.kernel.org/r/20230119184349.74072-3-bchalios%40amazon.es patch subject: [PATCH 2/2] virtio-rng: add sysfs entries for leak detection config: m68k-allyesconfig (https://download.01.org/0day-ci/archive/20230120/202301200640.CsblwTsa-lkp@xxxxxxxxx/config) compiler: m68k-linux-gcc (GCC) 12.1.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://github.com/intel-lab-lkp/linux/commit/2a801d93b8225555e4cb293a173e2053870cb2d1 git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Babis-Chalios/virtio-rng-implement-entropy-leak-feature/20230120-024631 git checkout 2a801d93b8225555e4cb293a173e2053870cb2d1 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=m68k olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=m68k SHELL=/bin/bash drivers/char/ If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> drivers/char/hw_random/virtio-rng.c:61:9: warning: no previous prototype for 'virtrng_sysfs_read' [-Wmissing-prototypes] 61 | ssize_t virtrng_sysfs_read(struct file *filep, struct kobject *kobj, | ^~~~~~~~~~~~~~~~~~ >> drivers/char/hw_random/virtio-rng.c:76:5: warning: no previous prototype for 'virtrng_sysfs_mmap' [-Wmissing-prototypes] 76 | int virtrng_sysfs_mmap(struct file *filep, struct kobject *kobj, | ^~~~~~~~~~~~~~~~~~ drivers/char/hw_random/virtio-rng.c:106:5: warning: no previous prototype for 'add_fill_on_leak_request' [-Wmissing-prototypes] 106 | int add_fill_on_leak_request(struct virtrng_info *vi, struct virtqueue *vq, void *data, size_t len) | ^~~~~~~~~~~~~~~~~~~~~~~~ drivers/char/hw_random/virtio-rng.c:120:5: warning: no previous prototype for 'virtrng_fill_on_leak' [-Wmissing-prototypes] 120 | int virtrng_fill_on_leak(struct virtrng_info *vi, void *data, size_t len) | ^~~~~~~~~~~~~~~~~~~~ drivers/char/hw_random/virtio-rng.c:141:5: warning: no previous prototype for 'add_copy_on_leak_request' [-Wmissing-prototypes] 141 | int add_copy_on_leak_request(struct virtrng_info *vi, struct virtqueue *vq, | ^~~~~~~~~~~~~~~~~~~~~~~~ drivers/char/hw_random/virtio-rng.c:160:5: warning: no previous prototype for 'virtrng_copy_on_leak' [-Wmissing-prototypes] 160 | int virtrng_copy_on_leak(struct virtrng_info *vi, void *to, void *from, size_t len) | ^~~~~~~~~~~~~~~~~~~~ vim +/virtrng_sysfs_read +61 drivers/char/hw_random/virtio-rng.c 59 60 #ifdef CONFIG_SYSFS > 61 ssize_t virtrng_sysfs_read(struct file *filep, struct kobject *kobj, 62 struct bin_attribute *attr, char *buf, loff_t pos, size_t len) 63 { 64 struct virtrng_info *vi = attr->private; 65 unsigned long gen_counter = *(unsigned long *)vi->map_buffer; 66 67 if (!len) 68 return 0; 69 70 len = min(len, sizeof(gen_counter)); 71 memcpy(buf, &gen_counter, len); 72 73 return len; 74 } 75 > 76 int virtrng_sysfs_mmap(struct file *filep, struct kobject *kobj, 77 struct bin_attribute *attr, struct vm_area_struct *vma) 78 { 79 struct virtrng_info *vi = attr->private; 80 81 if (vma->vm_pgoff || vma_pages(vma) > 1) 82 return -EINVAL; 83 84 if (vma->vm_flags & VM_WRITE) 85 return -EPERM; 86 87 vma->vm_flags |= VM_DONTEXPAND; 88 vma->vm_flags &= ~VM_MAYWRITE; 89 90 return vm_insert_page(vma, vma->vm_start, virt_to_page(vi->map_buffer)); 91 } 92 #endif 93 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests
