On Tue, 3 Jul 2018 09:03:46 +0200 Mathieu Malaterre <ma...@debian.org> wrote:
> Hi Nick, > > I am building my kernel (ppc32) with both > CONFIG_LD_DEAD_CODE_DATA_ELIMINATION=y and CONFIG_UBSAN=y. This leads > to ~316428 warnings such as: > > + powerpc-linux-gnu-ld -EB -m elf32ppc -Bstatic --orphan-handling=warn > --build-id --gc-sections -X -o .tmp_vmlinux1 -T > ./arch/powerpc/kernel/vmlinux.lds --who > le-archive built-in.a --no-whole-archive --start-group lib/lib.a --end-group > powerpc-linux-gnu-ld: warning: orphan section `.data..Lubsan_data393' > from `init/main.o' being placed in section `.data..Lubsan_data393'. > powerpc-linux-gnu-ld: warning: orphan section `.data..Lubsan_data394' > from `init/main.o' being placed in section `.data..Lubsan_data394'. > powerpc-linux-gnu-ld: warning: orphan section `.data..Lubsan_data395' > from `init/main.o' being placed in section `.data..Lubsan_data395'. > powerpc-linux-gnu-ld: warning: orphan section `.data..Lubsan_data396' > from `init/main.o' being placed in section `.data..Lubsan_data396'. > ... > > What would you recommend to reduce the number of warnings produced ? I > tried `--warn-once` but that only affect undefined symbols. I'm not sure if the linker can be quietened. You could try putting *(.data..Lubsan_data*) into the .data section in powerpc/kernel/vmlinux.lds.S Thanks, Nick
