On Mon, 4 Jun 2018, kbuild test robot wrote:
> Hi Mikulas, > > I love your patch! Perhaps something to improve: > > [auto build test WARNING on drm/drm-next] > [also build test WARNING on v4.17-rc7 next-20180601] > [if your patch is applied to the wrong git tree, please drop us a note to > help improve the system] > > url: > https://github.com/0day-ci/linux/commits/Mikulas-Patocka/USB-DisplayLink-patches/20180603-233013 What is it really complaining about? That URL shows 404 Not Found and this email has no warnings at all. > base: git://people.freedesktop.org/~airlied/linux.git drm-next > reproduce: > # apt-get install sparse > make ARCH=x86_64 allmodconfig > make C=1 CF=-D__CHECK_ENDIAN__ > > > sparse warnings: (new ones prefixed by >>) > > > vim +1198 drivers/video/fbdev/udlfb.c > > 1171 > 1172 /* > 1173 * Assumes &info->lock held by caller > 1174 * Assumes no active clients have framebuffer open > 1175 */ > 1176 static int dlfb_realloc_framebuffer(struct dlfb_data *dlfb, > struct fb_info *info, u32 new_len) > 1177 { > 1178 u32 old_len = info->fix.smem_len; > > 1179 unsigned char *old_fb = info->screen_base; > 1180 unsigned char *new_fb; > 1181 unsigned char *new_back = NULL; > 1182 > 1183 new_len = PAGE_ALIGN(new_len); > 1184 > 1185 if (new_len > old_len) { > 1186 /* > 1187 * Alloc system memory for virtual framebuffer > 1188 */ > 1189 new_fb = vmalloc(new_len); > 1190 if (!new_fb) { > 1191 dev_err(info->dev, "Virtual framebuffer > alloc failed\n"); > 1192 return -ENOMEM; > 1193 } > 1194 memset(new_fb, 0xff, new_len); > 1195 > 1196 if (info->screen_base) { > 1197 memcpy(new_fb, old_fb, old_len); > > 1198 dlfb_deferred_vfree(dlfb, > > info->screen_base); > 1199 } > 1200 > 1201 info->screen_base = new_fb; > 1202 info->fix.smem_len = new_len; > 1203 info->fix.smem_start = (unsigned long) new_fb; > 1204 info->flags = udlfb_info_flags; > 1205 > 1206 /* > 1207 * Second framebuffer copy to mirror the > framebuffer state > 1208 * on the physical USB device. We can function > without this. > 1209 * But with imperfect damage info we may send > pixels over USB > 1210 * that were, in fact, unchanged - wasting > limited USB bandwidth > 1211 */ > 1212 if (shadow) > 1213 new_back = vzalloc(new_len); > 1214 if (!new_back) > 1215 dev_info(info->dev, > 1216 "No shadow/backing buffer > allocated\n"); > 1217 else { > 1218 dlfb_deferred_vfree(dlfb, > dlfb->backing_buffer); > 1219 dlfb->backing_buffer = new_back; > 1220 } > 1221 } > 1222 return 0; > 1223 } > 1224 > > --- > 0-DAY kernel test infrastructure Open Source Technology Center > https://lists.01.org/pipermail/kbuild-all Intel Corporation > _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
