Hi Alan, Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on drm-intel/for-linux-next] [also build test WARNING on drm-tip/drm-tip drm-exynos/exynos-drm-next drm/drm-next tegra-drm/drm/tegra/for-next v5.17-rc5 next-20220224] [cannot apply to airlied/drm-next] [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/Alan-Previn/Fix-i915-error_state_read-ptr-use/20220226-055549 base: git://anongit.freedesktop.org/drm-intel for-linux-next config: i386-randconfig-a011 (https://download.01.org/0day-ci/archive/20220226/[email protected]/config) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project d271fc04d5b97b12e6b797c6067d3c96a8d7470e) 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/0day-ci/linux/commit/4ae08e2ae5d3ff4e465a35b05010e44d02b59aab git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Alan-Previn/Fix-i915-error_state_read-ptr-use/20220226-055549 git checkout 4ae08e2ae5d3ff4e465a35b05010e44d02b59aab # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/gpu/drm/i915/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <[email protected]> All warnings (new ones prefixed by >>): >> drivers/gpu/drm/i915/i915_sysfs.c:447:3: warning: variable 'ret' is used >> uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized] if (off < len) { ^~~~~~~~~~~~~~ include/linux/compiler.h:56:28: note: expanded from macro 'if' #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) ) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/compiler.h:58:30: note: expanded from macro '__trace_if_var' #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/i915/i915_sysfs.c:453:9: note: uninitialized use occurs here return ret; ^~~ drivers/gpu/drm/i915/i915_sysfs.c:447:3: note: remove the 'if' if its condition is always true if (off < len) { ^~~~~~~~~~~~~~~ include/linux/compiler.h:56:23: note: expanded from macro 'if' #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) ) ^ drivers/gpu/drm/i915/i915_sysfs.c:435:13: note: initialize the variable 'ret' to silence this warning ssize_t ret; ^ = 0 1 warning generated. vim +447 drivers/gpu/drm/i915/i915_sysfs.c 431 432 struct device *kdev = kobj_to_dev(kobj); 433 struct drm_i915_private *i915 = kdev_minor_to_i915(kdev); 434 struct i915_gpu_coredump *gpu; 435 ssize_t ret; 436 437 gpu = i915_first_error_state(i915); 438 if (IS_ERR(gpu)) { 439 ret = PTR_ERR(gpu); 440 } else if (gpu) { 441 ret = i915_gpu_coredump_copy_to_buffer(gpu, buf, off, count); 442 i915_gpu_coredump_put(gpu); 443 } else { 444 const char *str = "No error state collected\n"; 445 size_t len = strlen(str); 446 > 447 if (off < len) { 448 ret = min_t(size_t, count, len - off); 449 memcpy(buf, str + off, ret); 450 } 451 } 452 453 return ret; 454 } 455 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/[email protected]
