Hi Yuho, kernel test robot noticed the following build warnings:
[auto build test WARNING on remoteproc/rpmsg-next] [also build test WARNING on linus/master v7.0 next-20260422] [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/Yuho-Choi/rpmsg-char-fix-use-after-free-on-probe-error-path/20260421-073128 base: https://git.kernel.org/pub/scm/linux/kernel/git/remoteproc/linux.git rpmsg-next patch link: https://lore.kernel.org/r/20260416042338.10146-1-dbgh9129%40gmail.com patch subject: [PATCH v1] rpmsg: char: fix use-after-free on probe error path config: alpha-allyesconfig (https://download.01.org/0day-ci/archive/20260422/[email protected]/config) compiler: alpha-linux-gcc (GCC) 15.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260422/[email protected]/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <[email protected]> | Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/ All warnings (new ones prefixed by >>): In file included from include/linux/compiler.h:372, from include/linux/build_bug.h:5, from include/linux/container_of.h:5, from include/linux/list.h:5, from include/linux/kobject.h:19, from include/linux/cdev.h:5, from drivers/rpmsg/rpmsg_char.c:17: >> arch/alpha/include/asm/rwonce.h:23:9: warning: '__READ_ONCE' redefined 23 | #define __READ_ONCE(x) \ | ^~~~~~~~~~~ In file included from drivers/rpmsg/rpmsg_char.c:14: include/asm-generic/rwonce.h:44:9: note: this is the location of the previous definition 44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) | ^~~~~~~~~~~ vim +/__READ_ONCE +23 arch/alpha/include/asm/rwonce.h d6462858851549c Will Deacon 2019-10-30 11 d6462858851549c Will Deacon 2019-10-30 12 /* d6462858851549c Will Deacon 2019-10-30 13 * Alpha is apparently daft enough to reorder address-dependent loads d6462858851549c Will Deacon 2019-10-30 14 * on some CPU implementations. Knock some common sense into it with d6462858851549c Will Deacon 2019-10-30 15 * a memory barrier in READ_ONCE(). d6462858851549c Will Deacon 2019-10-30 16 * d6462858851549c Will Deacon 2019-10-30 17 * For the curious, more information about this unusual reordering is d6462858851549c Will Deacon 2019-10-30 18 * available in chapter 15 of the "perfbook": d6462858851549c Will Deacon 2019-10-30 19 * d6462858851549c Will Deacon 2019-10-30 20 * https://kernel.org/pub/linux/kernel/people/paulmck/perfbook/perfbook.html d6462858851549c Will Deacon 2019-10-30 21 * d6462858851549c Will Deacon 2019-10-30 22 */ d6462858851549c Will Deacon 2019-10-30 @23 #define __READ_ONCE(x) \ d6462858851549c Will Deacon 2019-10-30 24 ({ \ d6462858851549c Will Deacon 2019-10-30 25 __unqual_scalar_typeof(x) __x = \ d6462858851549c Will Deacon 2019-10-30 26 (*(volatile typeof(__x) *)(&(x))); \ d6462858851549c Will Deacon 2019-10-30 27 mb(); \ d6462858851549c Will Deacon 2019-10-30 28 (typeof(x))__x; \ d6462858851549c Will Deacon 2019-10-30 29 }) d6462858851549c Will Deacon 2019-10-30 30 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
