On Thu, May 11, 2023 at 03:21:01PM -0700, Kees Cook wrote: > On Thu, May 11, 2023 at 05:14:16PM +0800, kernel test robot wrote: > > FYI, the error/warning still remains. > > > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git linux-5.15.y > > head: 8a7f2a5c5aa1648edb4f2029c6ec33870afb7a95 > > commit: 33db9912ff7c491f839c89a08e98f755aa09598f [36/9999] ubsan: remove CONFIG_UBSAN_OBJECT_SIZE > > [...] > > >> arch/s390/kernel/vtime.c:132:2: error: cpu alternatives does not support instructions blocks > 254 bytes > > alternative_io("stpt %0\n .insn s,0xb2050000,%1\n", > > ^ > > Thanks for the report! I don't think the new errors are related to this > removal, though. This patch was just disabling a potential build config. Right, I am not really sure how the robot landed on this (perhaps there was another error that was being exposed by CONFIG_UBSAN_OBJECT_SIZE that disappeared with its removal?) but this is a problem with s390 specific code and clang's integrated assembler. I suspect it would be fixed with one of the patches from this series that landed in 5.19 but I have not looked too closely: https://lore.kernel.org/20220511120532.2228616-1-hca@xxxxxxxxxxxxx/ https://lore.kernel.org/Yot+xzLZETNTxNo+@osiris/ We use LLVM_IAS=0 for s390 on 5.15 in CI, hence why we do not see this. Cheers, Nathan
